Merger hunting the easy way

I posted a request yesterday afternoon for help in sorting out a set of possible mergers; as the developers are busy with Zoo 2, I just posted a set of lists. Clunky, and annoying, but I’d hoped people would still be able to help out. By the end of last night, forum member Waveney had built us a proper interface. You’ll find the address at the end of the instructions below.

1. Read Daniel’s guide to what makes a Galaxy Zoo merger, available as a pdf file.

2. Go to Waveney’s site and register (make up any name and password you want).

3. Classify away.

4. Sit back and relax.

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20 responses to “Merger hunting the easy way”

  1. Florian Saint-Pierre says :

    The site is not operationnal (at least with my firefox). When clicking on register, it offers a merger to sort (always the same, I’ve tried a few times) and does not consider any answers… Still some work to do…

  2. Chris says :

    It works for me in firefox. What version are you using?

  3. Waveney says :

    Currently 13 people have successfully used it. I use Firefox and others (but not IE). Florian – I can’t see an obvious user name entry for you what did you use – I may be able to see what is happening.

  4. Florian Saint-Pierre says :

    none, when I click on “register” it sends me directly to galaxy n°587724199885406295.

    It is v2.0.0.14 (maybe because it is the french version?)

  5. Waveney says :

    I have tightened up the checking when starting, so that you can’t click register without a username or password. I think this is what has gone wrong.

  6. Alice says :

    That’s cool, I just had the same thing – I clicked “register” first. Make up your username and password first, then click “register”, then you’re fine.

    Waveney, this is brilliant, a new Galaxy Analysis site! Thank you so much for making it. By the way, how are you doing the image feed – is it random, like Galaxy Zoo?

  7. Waveney says :

    I am using the list of Objects provided by Chris yesterday. Each user will start at a random image number and then work through the 15500 images in sequence. It keeps a record of the last one it sent you.

  8. veggy says :

    Waveney are we overloading your server? It’s all gone very slow my end.

  9. Tarquin_Q_Zanzibar says :

    Once again the GZ community shows it’s worth! Big ups & many props to Waveney!
    p.s. I’m sometimes getting the same image repeated immediately – not a problem I hope…

  10. Maju says :

    Thanks for the tutorial PDF. And thanks again to Waveney for the great site – it should solve my little headache. 🙂

  11. lehensuge says :

    Is there any record of the references of the galaxies we worked with day by day ?

  12. diaswa says :

    I like the “Zoom In” and ‘Zoom Out” buttons a lot, Waveney.

    Nice touch.

    Any chance we can see our “Merger” count stats ?

    Regards, diaswa

  13. Waveney says :

    Tarquin – Sometimes the same merger has several different Object Ids (eg one for each galaxy) these are often similar numbers and hence will appear together in the way I organise the data.

    Lehensuge – I am not sure I understand what you want. Yes there is a list of galaxies you have said Merger/Not a Merger to. Its not currently in a convenient form to display. Please explain what you want (best in the forum)

  14. oino says :

    This is great! I’m happy to be classifying again. Sorry for all the mistakes…

  15. Brian Whittaker says :

    OK, so I read the tutorial and registered on Waveney’s site and started chugging through, but I’m not at all comfortable.

    Considering, for example, 587724233710305473 which I would be strongly inclined to reject as a projection overlap rather than a merger – my instinct says that two galaxies really intermingling that much would show much more distortion (they’re pretty fluid – right?). Yet in Daniel’s tutorial fig 5 (2) and (5) and fig 6 (11) look awfully like it, and Daniel says “Yes!” and Daniel’s the astronomer.

  16. graham dungworth says :

    I analysed http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587724233710305473
    in the same manner for most of the mergers?
    ie. zoom in or out / invert the image- decide.
    No distortion, no stars interfering so it’s projection(line of sight)ie. NOT Merger.
    Occasionally, one queries is it an early merger?

    In this case, for your example Brian I noted it’s z distance, did an NED search to find z data for both ellipticals, namely 0.142 and 0.135 and noting errors. They are quite well separated ca. 80 light years if you use Ned Wright’s calculator.
    http://www.astro.ucla.edu/~wright/CosmoCalc.html
    cf. the Milky Way and Andromeda ca. 2 light years.
    Actually when the 80 ly popped up I thought that looks too distant!
    Finally, Daniel’s Fig5 (2) does look more projection than merger from the pdf file. He could be wrong and so could I lol.
    I spend about 10-15 times longer looking at each merger? than for the GZI images, but considerably more doing NED searches etc for those ” grey mergers”.

    Finally it’s definately projection ie. Not a Merger

  17. Grinz says :

    Glad to be of assistance – the zoom button really helps to see if there is/might be intermingling

  18. Jerzy1000 says :

    Witam wszystkich!

  19. Jerzy1000 says :

    Na rozgrzewke to moje laczace sie galaktyki?

    http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=588017705088057501

    Czy na tej stronie nie ma polskich liter?

  20. hrf says :

    Mergers are fun and the web interface works well. However, I keep running across nice mergers with probable foreground stars in or very near the merger.

    From the tutorial, it seems these should be classified as “not a merger” or “don’t know”, since you don’t want stars to contaminate the sample. Doing so feels wrong, however, when there is obviously a merger going on behind the foreground star or stars.

    Have I misunderstood the tutorial? If not, it would be nice to have a “merger with foreground stars” button as a classification option.

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