Ring of the Week: The Eagle Has Landed
“Fly me to the moon
Let me play among the stars
Let me see what spring is like
On a-Jupiter and Mars”
– Frank Sinatra, “Fly Me to the Moon”
This week I had the honour of meeting three legends of the 20th century; astronauts Capt. Neil Armstrong, Capt. Gene Cernan and Capt. Jim Lovell. Neil Armstrong is, of course, the first man to set foot on the moon (Apollo 11), Jim Lovell was the commander of Apollo 13 and Gene Cernan was the last man to walk on the moon (Apollo 17).
Right to left: Capt. Gene Cernan, Capt. Neil Armstrong and Capt. Jim Lovell
The astronauts were talking on behalf of the Foundation for Science and Technology at the Royal Society and Cernan and Lovell both spoke of their disappointment at the US plans to abandon the “Constellation” programme which aimed to put astronauts back on the moon by 2020. Cernan said that, walking on the moon in 1972, he never would have imagined that he would still be the last man to set foot on the moon’s suface over 37 years later. The astronauts also talked of their hope that they would be alive to see man set foot on Mars.
Politics aside, it was fascinating to hear the astronauts speak about their experiences. All of the astronauts agreed that travelling to the moon changed their perspective of life on Earth. Cernan said it was staring out of the window into the black “infinity of space”, whereas Lovell said it was looking back from the moon and “being able to cover the entire World with my thumb” that was the most life changing moment.
My Ring of the Week this week is Galaxy Zoo image 587741708326863123 and is in honour of Neil Armstrong and his lunar module, the Eagle. You can see the ring on the bottom right of the image and an unusual, bird-shaped “Eagle” galaxy on the top left. The “Eagle” galaxy is at the same redshift as the ring and so at the same distance away from us. This means that the two galaxies are most likely interacting in some way.
It could be that the “Eagle” is a polar ring (see last week’s post), where stars have been gravitationally stripped from the larger ring galaxy to rotate around the poles of the smaller galaxy. Or perhaps this is a collisional ring system, the “Eagle” having crashed through the centre of the larger galaxy to create the blue ring of stars that we see on the bottom right of the image. At the moment I’m not quite sure exactly which option (if either!) is the right one so feel free to post your own ideas about what you think may be happening and I’ll let you know if I figure it out!
Galaxy Zoo auf Deutsch!
Galaxy Zoo goes international. Nachdem unsere Webseiten schon seit einiger Zeit auf Polnisch zur Verfuegung stehen, haben wir jetzt endlich die langerwartete deutsche Version online. Saemtliche Links zur Zoo-Story, zur Zoo-Wissenschaft, und natuerlich zum Klassifizieren sind jetzt auch in deutscher Sprache vorhanden. Falls ihr euch nicht sicher wart, ob ihr die Kategorien alle richtig verstanden habt – klassifiziert die hundert tausend Galaxien doch einfach nochmal :-)! Und was viel wichtiger ist: jetzt koennen endlich eure Freunde und Verwandten mitmachen, die des Englischen weniger maechtig sind.
Ist die Galaxie strukturlos und rund, ohne Anzeichen einer Scheibe? Hat die Galaxie einen Bauch in ihrer Mitte? Wie rund ist die Galaxie? Gibt es Anzeichen fuer einen Balken der durch die Mitte laeuft? Gibt es Anzeichen fuer Spiralarme? Und viele Fragen mehr zu Galaxien, die euch sicher bekannt vorkommen – alles jetzt auf Deutsch. Also – viel Spass beim “clicken”!
Ring of the Week: Arp 87
“Up on a hill, as the day dissolves
With my pencil turning moments into line
High above in the violet sky
A silent silver plane – it draws a golden chain
One by one, all the stars appear
As the great winds of the planet spiral in
Spinning away, like the night sky at Arles
In the million insect storm, the constellations form
On a hill, under a raven sky
I have no idea exactly what I’ve drawn
Some kind of change, some kind of spinning away
With every single line moving further out in time”
– Brian Eno, “Spinning Away”
Well if you ask me, what you’ve drawn there Brian is a “Polar Ring” galaxy.
Polar ring galaxies, unlike all other galaxies in the Universe, are made up of two distinct parts. In the centre we have a normal galaxy and around the outside we have a “golden chain” of stars and gas clouds. This ring is perpendicular to the “silver plane” of the host galaxy disk, rotating over the poles, and so it’s known as a polar ring.
So how are polar rings formed? Polar rings are thought to form when two galaxies gravitationally interact with each other. We believe that “one by one, all the stars appear” as they are stripped from a passing galaxy and “spiral in” to produce the polar ring we see today. Polar rings, although not quite as rare as smoke rings, are pretty hard to find. According to “New observations and a photographic atlas of polar-ring galaxies”, about 1 in every 200 lenticular galaxies (a type of galaxy between an elliptical and a spiral) have these “golden chains” of stars and gas spinning around them. Below is a selection of some of my favourite polar rings from the Galaxy Zoo:
The Zooites have done fantastically well at finding Polar Rings and you can see all of their incredible finds on the Possible Polar Ring thread on the Galaxy Zoo forum.
My Ring of the Week this week is the stunning pair of interacting galaxies Arp 87. Located in the constellation Leo, approximately 300 million light years away from Earth, Arp 87 gives us a fantastic insight in to exactly how polar ring galaxies are formed. The image on the left is the Galaxy Zoo Arp 87 image and on the right is an image taken by the Hubble Space Telescope. We can clearly see the galaxy on the left gravitationally stripping away the stars and gas from the spiral galaxy on the right.
Unfortunately for Brian Eno, his hypothesis of a “golden chain” of stars that “spiral in” a “silver plane” came a full 23 years after the first polar ring galaxy was identified by J. L. Sérsic in 1967.
However, perhaps someone else had already had a genuine polar ring premonition a full 78 years before Sérsic’s discovery…?
– “Starry Night” 1889, Vincent Van Gogh
The Hubble image is part of a collection of 59 images of merging galaxies released on the occasion of its 18th anniversary on April 24, 2008. (NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University))
Hubble observations – any week now!
Speaking of the long-awaited Hubble observations of Hanny’s Voorwerp – where are they? We know certain windows when each can be done, and is supposed to be carried out. One such week-long window has already gone by without getting data, so things are narrowed down a bit. Read More…
UV(oorwerp) from Space
We have some new results to show off, Hanny’s Voorwerp observed using a space telescope. No, not that space telescope, that’s still coming up (shortly, we hope).
Soon after the initial results showed what a fascinating object Hanny’s
Voorwerp was proving to be, it was entered in the observing schedule for NASA’S GALEX satellite (GALaxy Evolution EXplorer). Alex Szalay, who belongs to both the GALEX and Galaxy Zoo science teams, played a key role in making this happen). Alex has interesting career parallels with Brian May, but that’s another story.
GALEX was designed to make the first sensitive ultraviolet survey of most of the whole sky (skipping only areas where there are such bright stars that they would damage the detector array), with a major goal of tracing the recent evolution of galaxies. Read More…
Zoo 2 Bars Paper Available Now
There’s been a lot of interest in the Galaxy Zoo 2 bars paper since I posted about its submission last month. So this is just a quick note to say we decided to make it available on astroph where you can read about the results in full.
She's an Astronomer: Manda Banerji
Dr. Manda Banerji is a postdoctoral researcher within the Institute of Astronomy at the University of Cambridge where she works on distant galaxies in the Universe. Originally from India, Manda moved to the UK almost 10 years ago to complete her A-levels and never dreamed at that point that she would fall in love with the UK so much that she’d still be here today! She completed her undergraduate degree at the University of Cambridge in 2005 and her PhD at University College London in 2009. In between Manda also spent a year working as a research scientist at the National Physical Laboratory.
When not doing research, Manda loves traveling the world and enjoys good food, good wine and the company of good friends. If she ever finds more hours in the day (or less of a need to sleep), she hopes to take up dancing again and start working on her first novel!
- How did you first hear about Galaxy Zoo?
I saw the Galaxy Zoo papers on astro-ph of course when they were first coming out. However, I only decided to get involved later when my PhD supervisor, Prof. Ofer Lahav mentioned it to me while I was at UCL. We were working together on using machine learning algorithms such as artificial neural networks to estimate the redshifts of galaxies from their colours. Ofer mentioned that he had used the same neural network tool to classify galaxies with collaborators in the early nineties. He also knew Chris Lintott from having been his PhD co-supervisor at UCL so we decided to start working together on applying machine learning to the Galaxy Zoo data.
- What has been your main involvement in the Galaxy Zoo project?
I led the machine learning paper which showed that the Galaxy Zoo classifications can be used as a “training set” in order to supervise the learning of automated morphological classifiers such as artificial neural networks. Once these networks have been “trained” using the human classifications, they can be used to automatically classify much larger data sets.
- What do you like most about being involved in Galaxy Zoo?
The best thing about being involved in Galaxy Zoo is the mass appeal of any work carried out on the project. I have always believed in the importance of communicating science not just to fellow researchers but also general members of the public so that they hopefully find it interesting and feel inspired to pursue some aspect of it themselves. The Galaxy Zoo project provides a wonderful forum through which to communicate interesting science to many many members of the public while at the same time getting them involved to contribute to the projects themselves.
- What do you think is the most interesting astronomical question Galaxy Zoo will help to solve?
I think one very unique aspect of Galaxy Zoo is the sheer size of the data set that has now been classified by eye. This means we can actually make a lot of statistically significant statements about the nature of our Universe. For example, what fraction of elliptical galaxies don’t live in overdense regions of the Universe? What fraction of them are blue? In addition, the discovery of unusual classes of objects such as the Green Peas will pose as yet undefined questions. This to me is the most fun part of doing science. You often don’t know what the best questions are to ask before you’ve stumbled upon an answer!
- How/when did you first get interested in Astronomy?
I first became interested in astronomy when I was about ten years old. I still remember the day actually. We were visiting the Kennedy Space Center in Orlando on a family holiday in Florida. I was so inspired and fascinated by everything I saw and just contemplating the vastness of space and the many things we didn’t know about it, I couldn’t imagine not wanting to find out more. Ever since that day I have wanted to be an astrophysicist. I should also mention that were it not for my brilliant physics teacher at sixth form college, I probably would never had the confidence to pursue an academic career. He would spend most of his lessons making us read New Scientist and watching Horizon and I think this is when I developed an appetite for scientific research and began to appreciate the creativity and independence it affords.
- What (if any) do you think are the main barriers to women’s involvement in Astronomy?
I think there probably were many barriers to women in astronomy ten maybe twenty years ago. However, I do feel that today this is much less of an issue. For example, I don’t think astronomy is any longer a male dominated subject and the situation here is much better than in other areas of physics. That is not to say that there aren’t many barriers to pursuing an academic career. For example the need to move around frequently for postdoc positions often means people have to make very tough choices. However, in my experience there are many men who worry about this too and many women who don’t so I don’t think this is a barrier that is specific to women by any means!
Having said that, one problem that I do think faces women in astronomy today is the lack of female role models. There are very few female astronomers in very senior academic positions and even fewer who have chosen to have a family. This does sometimes make me doubt if I can pull off both having a successful academic career as well as a family because there are so few examples of women who have actually achieved this! I hope this will change though in years to come.
- Do you have any particular role models in Astronomy?
I think there are so many people in astronomy (both men and women) who are inspiring in different ways that it’s very hard to single out just a few of them. I’ve learned different things from all the different people that I have interacted with so far in my research career and they’ve all been valuable lessons to learn!
This post is part of the ongoing She’s an Astronomer series on the Galaxy Zoo Blog is support of the IYA2009 cornerstone project of the same name (She’s an Astronomer). We are listed on the She’s an Astronomer website in their Profiles.
- Zooites:
- Hanny Van Arkel (Galaxy Zoo volunteer and finder of Hanny’s Voorwerp). Hanny’s interview in het Nederlands.
- Alice Sheppard (Galaxy Zoo volunteer and forum moderator).
- Gemma Couglin (“fluffyporcupine”, Galaxy Zoo volunteer and forum moderator).
- Aida Berges (Galaxy Zoo volunteer – major irregular galaxy, asteroid and high velocity star finder). Entrevista de Aida en español.
- Julia Wilkinson (“jules”, Galaxy Zoo volunteer. Frequent forum poster, and member of irregular and HVS projects).
- Els Baeton (“ElisabethB”, Galaxy Zoo folunteer. Frequent forum poster, and member of most of the spin-off projects!). Els’s interview in het Nederlands.
- Hannah Hutchins (Galaxy Zoo volunteer, forum poster and co-creator of Galaxy Zoo APOD)
- Researchers:
- Dr. Vardha Nicola Bennert (researcher at UCSB involved in Hanny’s Voorwerp followup and the “peas” project). Vardha’s Interview auf Deutsch.
- Carie Cardamone (graduate student at Yale who lead the Peas paper).
- Dr. Kate Land (original Galaxy Zoo team member and first-author of the first Galaxy Zoo scientific publication; now working in the financial world).
- Dr. Karen Masters (researcher at Portsmouth working on red spirals, and editor of this blog series.)
- Dr. Pamela L. Gay (astronomy researcher and communicator based at Southern Illinois University).
- Anna Manning (Masters’ Degree Student in Astronomy at Alabama University working with Dr. Bill Keel on overlapping galaxies)
We’re almost done – just one more Zooite and one more researcher to come in the series!
Ring of the Week: Arp 147
“Then take me disappearin’ through the smoke rings of my mind
Down the foggy ruins of time…
Yes, to dance beneath the diamond sky with one hand waving free,
Silhouetted by the sea, circled by the circus sands,
With all memory and fate driven deep beneath the waves,
Let me forget about today until tomorrow.”
– Bob Dylan, “Mr Tambourine Man”
After last week’s leisurely cruise through 450 million light years to Mayall’s Object, this week I take you on a flying tour across the local Universe to view the spectacular galactic jewels known as “Smoke Rings”.
Smoke Rings, like all collisional ring galaxies, are formed when a smaller galaxy hits bull’s-eye into the centre of a larger disk galaxy. The impact creates a density wave, throwing matter out into a ring shape. With the help of the Zooites I’ve found just 12 Smoke Rings in the Galaxy Zoo and so these amazing objects are very rare indeed. You can see 4 of them below:
There are two things you’ll notice about these galaxies:
Firstly, all of the smoke rings we’ve found are blue in colour. This is because as the shock wave expands into the disk, it triggers the birth of large numbers of high mass stars. Massive, young stars are extremely hot and so the light that they radiate is bright blue.
Secondly smoke rings, by definition, have no central nucleus. Answering the question of why smoke rings have no obvious nucleus is not as simple as it may sound but we believe that smoke rings are created in one of the following situations:
- The original target galaxy had no substantial nucleus to start with
- Or the angle and position of impact was such that the nucleus was thrown out into the ring
- Or the nucleus was destroyed by the impact
Smoke rings are incredibly important as they are shining blue clues as to how galaxies collide. My Ring of the Week this week is Arp 147 – a perfect example of the way that smoke rings allow us to turn back the clock and stare deep into the Universe’s distant past.
Arp 147 is located in the constellation Cetus over 400 million light years from Earth. The image on the left is the Galaxy Zoo Arp 147 image and on the right is an image taken by the Hubble Space Telescope. We can clearly see the “bullet” galaxy on the left and, on the right, the bright blue ruins of the original “target” galaxy. What makes Arp 147 so special is the unusual reddish-brown spot at the bottom of the ring and we believe that this marks the exact position of the original nucleus of the “target” galaxy. From the positions of the bullet, the smoke ring and the red spot we can rewind time over millions of years and simulate exactly how these two galaxies collided.
So as we “dance beneath the diamond sky” it is the smoke rings, beautiful in their simplicity, that make the “foggy ruins of time” crystal clear.
The Hubble image is part of a collection of 59 images of merging galaxies released on the occasion of its 18th anniversary on April 24, 2008. (NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University))
Ring of the Week: Mayall's Object
“Love is a burning flame
And it makes a fiery ring
Bringing hurt to the heart’s desire
I fell in the ring of fire”
– Johnny Cash
Before I venture any deeper into the mysterious world of Ring Galaxies, I thought I would give a quick introduction to the archetypal ring galaxy – the “Collisional Ring”.
Collisional Rings are formed when a smaller galaxy crashes through the centre of a larger galaxy. Just as throwing a stone into a pond creates an outwardly moving circular wave, a gravitational density wave is generated at the point of impact throwing matter out into a ring shape. Most Collisional Ring galaxies manage to hold onto a nucleus in the centre of the ring but sometimes the disturbance is so large that the nucleus is completely destroyed. Thanks to the work of Zoo members I have so far found about 125 Collisional Rings in the Galaxy Zoo (and still searching…!) so we can safely say that Collisional Rings are quite a rare phenomenon.
It is incredibly rare to see the galaxy collision actually taking place so my Ring of the Week this week is a fantastic Collisional Ring seen just after impact. Nick-named ‘Mayall’s object’, this ring is located in the constellation of Ursa Major, approximately 450 million light-years away. The image on the left is the Galaxy Zoo image and on the right is an image of the same galaxy taken by the Hubble Space Telescope. You can clearly see the elongated “bullet” galaxy blasting through the disc, creating a huge raggedy ring of stars.
The Hubble image is part of a collection of 59 images of merging galaxies released on the occasion of its 18th anniversary on April 24, 2008. (NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University))
She's an Astronomer: Hannah Hutchins
Hannah Hutchins lives in England with her Grandmother and her hamster, “Hubble”. At just 15, she’s by far the youngest entrant in our “She’s an Astronomer” series, providing us with some perspective from the next generation of astronomers. Hannah is homeschooled and currently studying for her IGCSEs. As well as being a frequent contributor to the forum, she is the co-creator of the Galaxy Zoo APOD. As well as Galaxy Zoo she’s involved in all sorts of astronomy projects, including the Young Astronomers blog.
- How did you first hear about Galaxy Zoo?
On the BBC News Website in August 2008. I read an article about Hanny’s Voorwerp and when they mentioned Galaxy Zoo I was immediately interested! I went onto the website and was hooked from then onwards.
- What has been your main involvement in the Galaxy Zoo project?
I classify galaxies, chat on the forum and I write Object of The Days (OOTD). Alice got me into writing the OOTD’s, which is when I discovered that I loved to write.
- What do you like most about being involved in Galaxy Zoo?
Knowing that I’m helping science. It’s fantastic because I don’t have to be an adult in university doing astrophysics or something to be able to contribute to science like this. It has also turned my interest in astronomy into a passion and I could never live without it. I’m now determined to go to university to study astrophysics. It’s also great to be part of such a friendly community! I finally found friends at the zoo who shared my interests.
- What do you think is the most interesting astronomical question Galaxy Zoo will help to solve?
There are so many to choose from! I have a soft spot for the Voorwerpjes though, It’s amazing how AGN (active galactic nuclei) belt out all that radiation which then ionize huge gas clouds, it creates some spectacular images.
- How/when did you first get interested in Astronomy?
My earliest memory of having an interest in astronomy was sitting on my bed when I was around four years old flicking through an astronomy book called ‘Spacewatching: The ultimate guide to the stars and beyond’, I remember staring in wonder at pictures of nebulae and reading aloud the titles in the book. My grandparents bought it for me at a sale along with a book about Comets after I pestered them for them. I think those where my very first astronomy books.
- What (if any) do you think are the main barriers to women’s involvement in Astronomy?
I’m not really sure, but I know from my experience of school (though rather a short experience, I only lasted a couple of terms in secondary school for instance because I wasn’t happy with the education I was getting) that there is sometimes an attitude where it is bad to have an interest in science and maths, they have to be viewed as so very boring. I think that is because it’s taught so badly at school, it shuts down any interest.
- Do you have any particular role models in Astronomy?
There are so many fantastic people in astronomy, but I don’t really have a role model.
This post is part of the ongoing She’s an Astronomer series on the Galaxy Zoo Blog is support of the IYA2009 cornerstone project of the same name (She’s an Astronomer). We are listed on the She’s an Astronomer website in their Profiles.
- Zooites:
- Hanny Van Arkel (Galaxy Zoo volunteer and finder of Hanny’s Voorwerp). Hanny’s interview in het Nederlands.
- Alice Sheppard (Galaxy Zoo volunteer and forum moderator).
- Gemma Couglin (“fluffyporcupine”, Galaxy Zoo volunteer and forum moderator).
- Aida Berges (Galaxy Zoo volunteer – major irregular galaxy, asteroid and high velocity star finder). Entrevista de Aida en español.
- Julia Wilkinson (“jules”, Galaxy Zoo volunteer. Frequent forum poster, and member of irregular and HVS projects).
- Els Baeton (“ElisabethB”, Galaxy Zoo folunteer. Frequent forum poster, and member of most of the spin-off projects!). Els’s interview in het Nederlands.
- Researchers:
- Dr. Vardha Nicola Bennert (researcher at UCSB involved in Hanny’s Voorwerp followup and the “peas” project). Vardha’s Interview auf Deutsch.
- Carie Cardamone (graduate student at Yale who lead the Peas paper).
- Dr. Kate Land (original Galaxy Zoo team member and first-author of the first Galaxy Zoo scientific publication; now working in the financial world).
- Dr. Karen Masters (researcher at Portsmouth working on red spirals, and editor of this blog series.)
- Dr. Pamela L. Gay (astronomy researcher and communicator based at Southern Illinois University).
- Anna Manning (Masters’ Degree Student in Astronomy at Alabama University working with Dr. Bill Keel on overlapping galaxies)
Still to come in the series – a few more Galaxy Zoo volunteers and researchers. We’re not quite done yet!
