Off to Queen Mary
I worried I’d look big-headed writing this blogpost, but ZookeeperKevin asked me to do so separately from my AAS one to encourage anyone reading this who is thinking of applying for astronomy courses. This morning I got an idea for a way to start: the UKRC is asking you to nominate someone for inspiring women and/or girls into science. Well, I’ve got a personal nomination right here: Galaxy Zoo.
In April 2010 I helped organise the She is an Astronomer conference, which Hanny also attended. There were several talks full of statistics and stories, some historical, some modern; some about problems, some about initiatives . . . I gave a talk about the power of the internet in getting people into disciplines they wouldn’t have encountered otherwise – such as, in my case, citizen science and astronomy. My message was intended to be: there are more recruiting grounds for astronomers than straightforward academia; perhaps more women will join the profession through citizen science. And men, of course – since Waveney is now doing just that!
It’s long frustrated me that I’ve been unable to understand much of scientific journals or to do much with databases like CasJobs. I’d like to go further than popular science. And the AAS conference opened up my curiosity like a bursting dam. I’d loved astronomy since I was little, but since May I have just been dying to know more. And feeling that it is within my grasp.
Anyway, I applied for a masters in astrophysics as soon as I got home (a masters is a postgraduate course, not as major as a PhD, but I hope to go on to do a PhD in galaxies or astrochemistry). Last Sunday morning I received an e-mail back. Odd for a Sunday but I bet they were hunched over their desks on a Saturday night, groaning that they hadn’t got the selections done by Friday afternoon, fuelled on fourteen cups of corrosive coffee – or something like that.
Anyway – result: unconditional offer! It’s at Queen Mary University in north east London. These are the course modules – I can’t wait! I’ll be doing the course part-time as I’ll need a job and doubtless have a lot of maths to catch up on. I’ll hopefully be able to organise more zoo meet-ups from London too.
I hope that anyone else who’s been thinking they’d like to study astronomy formally will give it a try. If you think you haven’t time, or you’re not clever or well-informed enough – don’t rule it out. A lot of things that look scary turn out to be acronyms for simple concepts, for example. More to the point, ignore all the cultural depictions of academia as something set aside for inhuman people. Just give it a go.
Chandra time for IC 2497 and the Voorwerp!
The list of approved targets for Cycle 13 of the Chandra X-ray Observatory is out and on it is our friend IC 2497. We were awarded 114 ksec (almost 32 hours) of time to point Chandra at IC 2497 and peer into its center. What do we want to learn? First, we want to see if the wimpy signal from the central black hole comes more into focus. Chandra has much better spatial resolution than XMM so we will be able to resolve the very center.
We also want to see if there is any impact of the ex-quasar on the surrounding hot gas in the galaxy center. Did the quasar blow bubbles into the gas? Did it start doing so when it “switched state”?
Unfortunately we won’t know for quite a while as Cycle 13 only starts later this year and will go on into 2012. So, stay tuned!
Insane Happiness in Massachusetts
Today’s post is by Alice Sheppard:
Last winter I got a phone call from ZookeeperChris who asked me if I’d be interested in attending the next American Astronomical Society conference (spelled AAS, and pronounced “double-A-S”). The very idea seemed too good to be true – so too good to be true that I shoved it to the back of my mind in case it was all a dream.
But it wasn’t, and bit by bit I booked flights and sorted out an ESTA. This May’s conference was to be in Boston, the city south of the river from Harvard University, near which the writer Lois Lowry’s teenage heroine Anastasia lives. (“I have just returned from Boston. It is the only thing to do if you find yourself there,” the comedian Fred Allen is alleged to have said.)
That was especially neat for me, because there was some research I wanted to do in Harvard’s archives. (If it comes to anything, I will tell you all about it, but I’m not ready to make it public yet.) I started picking around for youth hostels at which to spend some extra time in Boston. Even in March and April, all the cheapest places were booked, but I set to planning my first visit to America with mounting excitement . . .
The journey across the UK took as long as that across the Atlantic. I had never been out of western Europe before. Flying over Nova Scotia was especially fascinating – great ripply expanses of dark rock and snow. At the airport I was greeted with two incredibly long queues and the ghastliest “welcome” video I have ever seen. As soon as I got through security (where they confiscated my sandwiches!) into Boston I knew I disagreed with Fred Allen entirely. The air was silky with a pleasant cool humidity, the streets were bright red and green with brick houses and healthy trees. Their version of the Tube was cheap, very frequent, and incredibly cute – random little walkways and steps up to the train from a rail-level platform everywhere. I clambered out of Copley Place station into a huge square surrounded by fast roads with long cars and grand-looking buildings, some of which had red curtains in the windows like palaces. The hotel ZookeeperJordan had booked me into (thank you!) was also the most glamorous place I’d ever seen. My own lecturers at university had spent field trips at cheap youth hostels with the rest of us, so all the glitz came as a bit of a shock, especially with the bottles of water being eight dollars each!
After 22 hours of travelling I failed to stay awake for the reception on Sunday night! I met Chris at 8 on the third floor of another glitzy hotel where the conference was taking place. There was a central room full of exciting – if difficult – posters from astronomers all over America, at the back of which stood a trolley full of delicious little pastries and two tables of tea and coffee each morning. Around this room were two floors full of all the different talks. There were usually at least four going at once, so I had to make a great many sorrowful sacrifices – I wanted to hear absolutely everything.
I was effectively there both as press and as a zooite, meaning I attended press conferences or the more technical lectures as I wanted. The press room was on the seventh floor; the lifts went so fast they made me feel sick, as if I was in a ship on a storm. (I don’t think all that travelling entirely agreed with me!) There was more tea and coffee up there, a nice big table to punch our laptops at, a pigeonhole for each of us full of press releases and dinner announcements – I signed up to a dinner on Tuesday evening. We spent a good hour or so trying to hear each other in a very noisy bus in Boston and Cambridge traffic, had a Chinese meal, and then wandered along to Harvard College Observatory.
The room we sat in was next to the largest telescope. It had railings at the top with planetary symbols welded into them. It had been built for public nights on the order of Harlow Shapley in about 1930 – and these public nights had continued ever since. This evening we began with a slideshow of ridiculous Boston signs, mostly along the lines of “Welcome to Boston – now get the hell out of my way” and “HA HA YOU’RE GOING TO BE LATE FOR WORK” – after all that time on the bus you can imagine us press folks screamed with laughter! We then went on to how Harvard College Observatory began, with its little army of “female computers” and how Henrietta Leavitt discovered Cepheid variables. That talk was followed by one from Richard Panek about his new book, “The 4% Universe”, which looks very good. Apparently the furthest supernovae were fainter than they should have been and this was how the acceleration of the expansion of the Universe was discovered. I thought this meant that things expanded slowly in the past and quickly now, and asked about this paradox, but the amount of offended-seeming yelling in my direction both that night and the next day from several well-meaning press people indicated that either I missed something fundamental about the idea, or they did about my question.
I went to a few press conferences, some of which were good, but the talks I enjoyed the most were the most technical presentations by the academics! I stuck mostly to these, my notebook’s scribble content growing wildly. (In between talks and amazing meals, I tried to keep the Zoo updated, but Stellar190 did a better job than me just through the tweets!) The Galaxy Zoo talks were about bars, red spirals, galaxies’ environments, active galactic nuclei and what feeds them, and more . . . I also heard about stellar weather and how it affects planets (as well as our ability to find them), about redshift-space and Margaret Geller and John Huchra’s work mapping the Universe, about polycyclic aromatic hydrocarbons – honeycomb-shaped sooty molecules – in Titan and in nebulae; about thrilling surveys of galaxies and of supernovae and of all other things; about planet-finding techniques and attempts to guess stellar age (which is remarkably difficult because stars look pretty much the same except when very young or very old); about what today’s great telescopes are up to; about the search for planets beyond Pluto which some astronomers assured me was pseudoscience while the speakers looked very sure of themselves; lots about quasars and active galactic nuclei; lots of strange techniques with unfamiliar acronyms – just the kind of thing to terrify me – until people told me what they meant and they suddenly became logical and something I could master.
There was a lot I didn’t understand. But three things were very reassuring: firstly, that there was a lot I did understand; secondly, when all the astronomers assured me they didn’t understand everything either; thirdly, when, after being a pest and asking several questions in it seemed every single talk, quite a few people asked me what I was studying and when I told them I’m just an amateur, urged me to do a PhD and go into academia because I clearly had a good grasp of the subject.
And this is someone who was ordered to drop maths and physics at age 16, and who struggled through a science degree and thought herself a failure as a result. This is someone who, five years ago, hadn’t a clue that astronomy was a subject anyone other than professionals could contribute to – much less that she herself could be part of.
And now I’ve spent four years moderating our beloved forum, learning so much from zooites and zookeepers – and this week really was the greatest payment I could possibly have had for my work. And I sense that it’s only the beginning.
On Wednesday, the third day and last full day, there is invariably an AAS party. I am not very good at parties and had to be forcibly dragged along. When the people who run AAS were also caught dancing and falling over with a flourish, intermingled with comments from other astronomers that they’re no good at parties either and many of them only dance twice a year, I certainly relaxed! I made some more friends – and I’d already made a few at the conference – and got back to the hotel some time into the small hours. I regrettably failed to manage the lecture first thing next morning, which was a pity because it was on the smallest, faintest galaxies and besides apparently being very good would have been right up Waveney’s street. I wrote a while ago that irregular galaxies, which Waveney is studying, might be the plankton and bacteria of the Universe – not the great tigers and elephants that are spirals and ellipticals, but perhaps just as important to understand – who knows? Maybe we Zooites will.
At lunch time on Thursday it was time for the astronomers all to jet off to their various locations – some with new toy mooses, because the next summer meeting will be in Alaska (it’s nice to know astronomers don’t have to act mature) – and me to stumble my heavy bags along to the youth hostel where I would spend the next nine days. I was so sorry the conference was over; it was like being in a brilliant shower of beautiful facts and news. It was lovely to see all the zookeepers I’d met before – Chris, Kevin, Carie, Lucy, Pamela – and to meet Karen, Ivy, Brooke, Alfredo (I sadly missed meeting Meg) – and my apologies to anyone I’ve forgotten there!
I had a great week exploring Boston and doing research. The temperature skyrocketed and suddenly the humidity became a real burden – now I know why all the East Coasters complain about it! A terrific storm broke on Wednesday night; for three quarters of an hour the clouds were almost constantly lit by sheet lightning, something I’d never seen. I turned off the light in my youth hostel room and sat at the window spellbound. It became distinctly less enjoyable when I looked at Twitter on my phone and discovered that there were the first tornadoes taking place in Massachusetts for decades and people had actually been killed.
Very early on the morning of Saturday 4th June, I was back at the airport on my way to Chicago to visit Chris at the Adler Planetarium, where he’s been spending his sabbatical developing (among other things) the Citizen Science Alliance – onto whose advisory board Jules and I are thrilled to be invited! Chicago was even hotter than Boston. You know those hot winds you get in the London Underground when a train is coming? We got those in Chicago outside – but hotter and much stronger! I felt myself wilting most of the time, and ached to dive into the beautifully clear blue water. My hotel there was toblerone-shaped and I was on the 27th floor – the view was spectacular! Chicago has a double layer of roads and railways, so you often have to go up stairs to get to the street you’re after – I think Chris said there’d been plans to flood it, among other eyebrow-raising engineering feats. I failed to spot any Chicago gangsters too. In fact my welcome to Chicago, apart from the crippling heat, was the best possible. The airport walls are lined with astronomy pictures. Just as we are reaching out to the stars, we are bringing the stars to the public, too, as is only right – but so delightful.
Adler Planetarium is beautiful. I can see why Chris loves working there. There is a wall display of the whole area of the Milky Way Project, archways like Moon rock, beeping flashing machines representing cosmic rays as they come through Earth’s atmosphere, a screen which shows you in infra-red light, and a small lecture theatre full of huge screens and computers – including 3D – in which to give talks. I found myself in here on my last day (about an hour before I was due to head off to the airport) giving a Galaxy Zoo talk to all the visitors that wandered in! That was a bigger challenge than most talks I give, because people were continually wandering in and out, and some stayed much longer than others. I also met a lot of scary “educators” or something, who Chris was telling about various Zooniverse projects, and heard more plans for the Zooniverse.
If you’re anywhere near Illinois, I strongly recommend the Adler Planetarium. On our first walk there, I joked to Chris about how if I ever get married I want it to be in a planetarium under a magnificent galaxy-filled sky, and he pointed ahead to show me that a wedding actually was taking place there!
I loved America and it was very sad to be on my way home (especially as one of the many friends I made had told me to look out for the aurora on the right – but not only did it not appear, we went so far over the North Pole that we stayed in daylight!). After setting off in late afternoon on Tuesday, I got home on Wednesday evening, and the very next day was bumbling around in my little office like an extremely clumsy zombie.
Thank you so very, very much to Chris and Jordan and everyone on the Galaxy Zoo team who arranged for me to come – it was the best present anyone could have given me – and for showing me round (including to excellent restaurants) and making sure I had such a wonderful time there. Thank you too to Rick Feinberg of AAS Press, who was invariably kind and extremely quick to help and explain things I needed to know. I hope more Zooites will be able to attend AAS conferences one day.
The August edition of the Astronomy Now magazine will contain six brief snippets on the conference from me – they’re just a few pretty starclusters out of a very big galaxy of delights, which will give you an idea of just what a wonderful conference it was!
The Peas – Now detected in Radio!
Last September I blogged about a proposal that had just been accepted at the Giant Metrewave Radio Telescope (GMRT) to follow up on the Peas with radio observations. Now the observations are in, and we have successfully detected the Peas at radio wavelengths!
The Peas, which have very high star formation rates, are expected to host a large number of supernova, which are created when the most massive stars die. These supernova create shocks that accelerate electrons in galaxy to relativistic energies. These relativistic electrons emit a type of emission, synchrotron radiation, that is visible in radio wavelengths. Therefore, the radio emission can tell us about the stars that live (or lived) in the galaxy.
Three of the Peas from our paper (Cardamone et al. 2009), were followed up with deep observations using the GMRT. It turns out that the Peas have comparable, but systematically lower flux when compared to local starbursts.
Using the observed radio emission, the magnetic field of the galaxy can be derived. These new observations suggest a magnetic field in the peas similar to that of the Milky Way. Because galaxies are thought to build up their magnetic fields over time, it is surprising to see such a large magnetic field in such a young galaxy. (Estimates of the age of the stars in the Peas are roughly 1/100th that of the age of the stars in the Milky Way).
One of the reasons that the Peas are so fascinating is their similarities to vigorously star forming galaxies found in the early universe (known as Lyman Break Galaxies). These Lyman Break Galaxies are so far away, they haven’t yet been directly detected in radio emission. However, estimates of their radio flux (from a technique called ‘stacking’) also suggest consistent radio fluxes with those observed for the Peas.
These observations suggest that galaxies like the Peas (and the Lyman Break Galaxies), may start out early in their life with very large magnetic fields. These observations challenge the assumption that galaxies build up their magnetic fields slowly over time and it is another piece of the puzzel in understanding of how galaxies are formed.
The article will be coming soon to astro-ph and I will post it here to let you all know.
Great Review of Galaxy Zoo in this week's Science
There’s a great review of Galaxy Zoo and its achievements in this week’s Science Magazine. The link to the article is here and the summary reads:
Galaxy Zoo Volunteers Share Pain and Glory of Research
The Sloan Digital Sky Survey (SDSS) has compiled a list of more than 1 million galaxies. To glean information about galaxy evolution, astronomers need to know what type of galaxy each one is: spiral, barred spiral, elliptical, or something else. The only reliable way to classify galaxies is to look at each one, but all the world’s astronomers working together couldn’t muster enough eyeballs for the task. A volunteer online effort called Galaxy Zoo, launched in 2007, has classified the entire catalog years ahead of schedule, bringing real statistical rigor to a field used to samples too small to support firm conclusions. The Galaxy Zoo team went on to ask more-complicated classification questions that led to studies they hadn’t thought possible. And in a discussion forum on the Galaxy Zoo Web site, volunteers have pointed to anomalies that on closer inspection have turned out to be genuinely new astronomical objects.
Unfortunately accessing the full article requires a subscription.
AAS January Voorwerp even video available
As Bill has spotted on the forum, the video of the press conference at the January AAS meeting where we presented the Hubble Space Telescope of Hanny’s Voorwerp is now available from the AAS. We shared the event with two other cool results, so you can hear about them as well. The video (warning, large file!) is available here: video of the January press event
Hubble Zoo: Summer Research Starts!
Today’s guest post is from Anna Han:
Hi everyone!
My name is Anna Han, and I’m a sophomore undergrad at Yale studying black holes this summer. I’m currently working with images of galaxies observed by Hubble that you as members helped classify on Galaxy Zoo. So excited to be part of the community, and looking forward to sharing ideas with you all!
Galaxy Zoo Voorwerpjes – now with Hubble data!
Some of us continue to exult over the approval of our Hubble proposal to look at some of the “voorwerpjes” found through the GZ forum. These are clouds of gas ionized by an active galactic nucleus, similar to Hanny’s Voorwerp except for being smaller and dimmer (hence the Dutch diminutive form of the word). This has been a very fruitful project, going back to the first few possibilities posted for discussion in different contexts by Zooites. From these, I realized that such clouds could be spotted based on their unusual colors from the SDSS images, and with contributions from Waveney and laihro setting up the web interface and one of our source lists, the hunt was on! The results staggered us – within 6 weeks each of the 18,000 candidate galaxies had been examined by at least 10 Zooites. Seven of you looked at them all! Then we could examine the highest-scoring galaxies, in three sessions from Kitt Peak and Lick observatories, measuring spectra to see which ones really show gas ionized by an active nucleus. Once again, Drew, alias sdrew123, has done a lot of the data reduction and Python action in this part of the project. Our sample of giant AGN clouds now includes 19, each showing gas more than 10 kiloparsecs (32,000 light-years) from the galaxy core, so we get information on its history over at least that many years.
Why do we want to find these? From what we’ve learned about Hanny’s Voorwerp, we have the possibility of tracing the history of active galactic nuclei – how fast they can fade, how long they stay on at once, and maybe how they influence their surroundings. It’s hard to generalize from a single instance (though astronomers are notorious for trying), so we want enough of a sample for statistically defensible conclusions.
Which of our objects should we ask to look at, balancing the demand for Hubble time against the fact that very often more data are better? From our current point of view, investigating whether active nuclei shut down very often within time spans roughly 100,000 years, we want to concentrate on the ones that show evidence for a deficit of energy from the core compared to that needed to light up the gas we see. This gives us a set of 7 (plus NGC 5252, which has been known for many years and already has archival Hubble images). They are:
SDSS J143029.88+133912.0, the Teacup (Kevin started calling it that in honor of the handle-like loop of gas extending more than 15,000 light-years to the side). This is the most distant galaxy in the sample, at z=0.085.
UGC 7342 (also known in some Zoo threads as the Crab galaxy), with its enormous filaments of gas stretching more than 100,000 light-years on each side (fully half as large as Hanny’s Voorwerp, and at about the same distance).
Another new SDSS AGN, and new Zoo find for its gas clouds, is
SDSS J220141.64+115124.4 (which I tend to abbreviate to SDSS 2201+11 for my own sanity).
SDSS J151004.01+074037.1, with symmetric clouds around a type 2 Seyfert nucleus, is another SDSS//GZ discovery.
NGC 5972 is pretty close to us at z=0.0297. This galaxy attracted some brief notice in a 1995 paper by Mira Veron-Cetty and Phillippe Veron, who established that what look like spiral arms are purely ionized gas features, and noted that this AGN is surrounded by a double radio source.
UGC 11185 is part of a very disturbed interacting pair, with a bright spray of ionized gas seen to the east of the AGN. Note to self: we need to take care in where we center the Hubble images to avoid problems with scattered light from the annoyingly bright star.
Mkn 1498, as the name suggests, has a long-known AGN, but its ionized gas shows such strong radiation
reaching it that this one may have faded even to its observed brightness.
We based our observation request on what we learned from working on the Hanny’s Voorwerp data. The most valuable results for these will probably come from images in Hα and [O III] for these, the clouds sometimes extend into the galaxy, so we need red and green starlight images to distinguish stars and gas. Our filter selection depends on the galaxy redshift – the brand-new Wide-Field Camera 3 (WFC) has cleaner performance but only a limited set of narrow filters, while the decade-old Advanced Camera for Surveys (ACS) has ramp filters which can tune to any desired optical wavelength, but its CCD detectors are really showing the ill effects of damage from years in the space environment. So we use WFC where we can and ACS otherwise, emboldened by the release of Jay Anderson’s software for partially undoing the effects of that radiation damage. We end up using 3 orbits per galaxy – one for each emission line and the other for broad-band filters to map the structure and color of each galaxy’s starlight.
We know some of the things to look for in the data – regions of star formation, gas outflow, maybe shadowing effects from material near the galaxy nuclei. But the best is often in what we don’t know to look for beforehand…
Next up – detailed observation planning, at which point we get our first hints as to when each galaxy could be observed.
AAS 218: Black Hole Growth and Host Galaxy Morphology
Following Karen’s AAS 218 roundup, here is my talk from the Galaxy Zoo special session:

You can get the whole talk as a PDF or as a Quicktime movie.
Galaxy Zoo Lunch at the AAS
Following our session on “Cosmic Evolution from Galaxy Zoo“, a number of the Galaxy Zoo group went to lunch at a local Boston seafood place. Ivy (Wong) took a few photos, which I thought you might like to see.
By the way, the AAS abstracts are now up on the ADS, so I have put the links up on the previous post.



