Galaxy Zoo Talk

Hubble - New Images!

  • Capella05 by Capella05 moderator

    Hi Everyone ๐Ÿ˜ƒ

    As you can see, we now have new images to classify - from Hubble!

    Please have a read of this Bog post from Karen - New Images on Galaxy Zoo, Part 1

    Also, as these are no longer SDSS images - SkyServer will not be available to look up additional information.

    If you have any questions with regards to the new survey, please post your question and we will get an answer from members of the science team.

    Happy Hunting! ๐Ÿ˜ƒ


  • Budgieye by Budgieye moderator

    There are Hubble images over on the old forum, with spectra and SDSS image for comparison

    Galaxy Zoo: Hubble (Galaxy Zoo 3)

    Redshift of Hubble galaxies, with spectra Do you want to know how far away a Hubble galaxy is? Here are some you can use for comparison.

    Hubble stars

    Hubble ellipticals

    Hubble spirals

    Hubble starburst galaxies

    Hubble clumpy galaxies

    Hubble OIII galaxies (with OII peak, peas)

    Hubble quasars

    You can get a redshift by pressing "Open in Tools" to get to the information dashboard

    The SDSS buttons only work for SDSS SkyServer images, not Hubble images. You can get a redshift by pressing "Open in Tools" to get to the information dashboard. Nearly every Hubble galaxy has a simple spectral chart

    I should note that you can always check SkyServer to see if a galaxy image is available in SDSS and, if so, what it looks like in that survey. This usually only works for larger galaxies: if the galaxy is a dim smudge, SDSS ignores it.

    The way to check is to use a URL like:

    where you modify the URL to include the RA and DEC as shown on the object's page just below the image of the object here on Talk.

    If the DEC Declination is -27, don't bother, the galaxy is in the southern skies, and SkyServer only goes to -6 or so.

    modified from a post by by vrooje ADMIN, SCIENTIST

    Why are these Hubble images so poor?

    Actually, they aren't. The distances aren't the same at all. Hubble images generally have much longer exposure times, but they are looking much farther than the SDSS. Also, the telescopes are about the same size in terms of mirror diameter, so they collect about the same amount of light, but the design of the surveys are really different.

    Hubble is great at taking really deep exposures of smaller patches of the sky compared to ground-based surveys like the SDSS. The SDSS covers about two-thirds of its visible sky (from horizon to horizon). The GOODS fields, on the other hand, are so small on the sky that you could cover them up with your thumbnail held out at arm's length. Yet there are thousands of galaxies in each field, and Hubble's resolution is so great that it can resolve enormous detail where most ground-based telescopes would only see a fuzzy blob. Most of those galaxies, even the nice and resolved ones, are much smaller on the sky than the apparent width of a single human hair held at arm's length.

    Incidentally, Hubble is great at getting images of much nearer galaxies with incredibly fine resolution. Those are the pictures we're used to seeing in the news! Check out for some of those, and then have a look at the data from the PHAT survey, the largest survey (in terms of telescope time) ever using Hubble. A lot of our volunteers are very, very familiar with PHAT images! ๐Ÿ˜ƒ That survey was resolving individual stars in Andromeda, which is a testament to Hubble's incredible resolution.

    No matter what the technology, scientists will always push it to its limit, and Galaxy Zoo is doing that as much as every other astronomical project. There were little fuzzy blobs in SDSS too:

    and now that we can resolve the SDSS blobs with Hubble, we're pushing much further out until all we can see with Hubble is a blob. The Hubble blob limit happens to be so far out that we're looking at the Universe as it was when it was only a few billion years old, much farther than with SDSS, but there's still farther to go. Once we have the next generation of super-high-resolution telescopes, we'll push those to their limits too. It's just to try and squeeze every last drop of science out of the data!

    by vrooje ADMIN, SCIENTIST in

    Talk: New GOODS GZ images, a science question Technical information on the filters used. (Hubble Zoo 2012)

    What are clumpy galaxies?

    The Hubble images currently being shown in classification have some clumpy galaxies to be classified. These galaxies are extremely distant, and are still being formed our of smaller clumps.

    enter image description here

    The can be challenging to classify, but we can just do our best.

    enter image description here Pinocchio

    Some Hubble lenses. from 2001. I should check and see if they were followed up. Not much of an arc to any of them.

    enter image description here

    Strong Gravitational Lens Candidates in the GOODS ACS Fields

    enter image description here

    Clumpy galaxies need a lot of magnification to be seen. I can see a clumpy galaxy above the target galaxy. They are blue and have an irregular shape. The zoomed in images look more pixellated. The target galaxy in the center of the image is closer to us, so it appears larger and needs a zoomed out image. It looks like an edge-on galaxy, with a bulging nucleus. So I would classify as

    Features or disk, clumpy -no, Could this be a disk viewed edge-on? yes, rounded bulge, anything odd-no.


  • Budgieye by Budgieye moderator

    Correct, the SDSS buttons only work for SDSS SkyServer images, not Hubble images. You can get a redshift by pressing "Open in Tools" to get to the information dashboard. Nearly every Hubble galaxy has a simple spectral chart done by a another telescope on the ground. I have edited my previous post to make this more clear, thank you for pointing it out.


  • c_cld by c_cld

    According to blog March 27, 2015 by karenlmasters New Images on Galaxy Zoo, Part 1

    The new CANDELS images, however, are slightly shallower than before. The main reason that these are being included is to help us get data measuring the effect of brightness and imaging depth for your crowdsourced classifications.

    Left: deeper 5-epoch images already classified in GZ. Right: the shallower 2-epoch images now being classified.

    AGZ00084yw 19532 15183 AGZ000870z

    Surprisingly both are presented in this batch for classification!


  • Darkknight1245 by Darkknight1245

    How far away are these galaxies on average?


  • ElisabethB by ElisabethB moderator

    Quote from this thread :

    between approx. z=0.25 to approx. z=3


  • Budgieye by Budgieye moderator

    Work in progress about navigating in GOODS and CANDELS. Not organized or checked for accuracy or usefulness.

    New Images on Galaxy Zoo, Part 1 March 27, 2015 by karenlmasters "The GOODS images are made from more HST orbits and are deeper, so you should be able to better see details in a larger number of galaxies compared to HST." GOODS: The Great Observatories Origins Deep Survey

    THE NORTH HUBBLE FIELD has a DEC of about 52(declination) (look at coordinates under the image)

    Here is the north of sky in Google sky. The Hubble images are from the grey rectangle.

    enter image description here

    It is amazing to think that our new 100,000 ? (200,000?) Hubble galaxies are in that strip
    I have glued in a Full Moon for size comparison.
    It is in Bootes, near the handle of The Plough/Big Dipper

    Info on the Extended Groth Strip in the AEGIS survey

    enter image description here

    The AEGIS field is made of about 100 tiles, and each tile can be viewed.
    You can move around in the Groth strip, there is ra and dec, but no ID numbers Deep Hubble Space Telescope images of the EGS were taken with the Advanced Camera for Surveys (ACS) as part of GO Program 10134 (PI M. Davis; Davis et al. 2007, ApJ, 660:L1). The EGS was imaged in F606W (2260s) and F814W (2100s) over 63 tiles in a ~ 10.1 arcmin x 70.5 arcmin strip centered at J2000 RA= 14:19:18, Dec=+52:49:25.

    the site aegis

    where i put in OBJNO the number of the image.
    Usually it works when the number is 12..., 13... (the GOODS_north field) but not 9....

    enter image description here DEEP 2 redshift and spectra data are in the cyan (blue) box


    enter image description here SDSS


    You can look up the coordinates of the North Sky in SDSS, but the galaxy you want may be very dim, or only a unlabelled grey smudge. SDSS doesn't cover northern skies, it only goes as far south as about -8. Hubble south is -27.

    THE SOUTH HUBBLE FIELD has a DEC (declination) of about -27 (look at coordinates under the image)

    enter image description here GEMS

    You can navigate through GEMS

    enter image description here GOODS-S (South) a clear explanation of the fields by our own Jean Tate.

    GEMS navigator GEMS SkyWalker is pretty but it has no co-ordinates

    use GEMS Data Table to find file with coordinates you want.

    Google Sky GOODS S

    Tues Jan 11 2011 Finding more information about Hubble galaxies

    HST/ACS Imaging Data hosted at UCSC


    enter image description here

    CANDELS: The new data in Galaxy Zoo Harry Ferguson, CANDELS Co-Principal Investigator "astronauts again visited Hubble and installed a new infrared camera: the Wide-Field Camera 3 (WFC3)."

    Re: Finding redshift and spectra for Hubble galaxies in various databases
    ยซ Reply #10 on: March 14, 2012, 04:16:09 am ยป
    Hello everyone, sorry that the Hubble Galaxies have caused so much confusion among the galaxy zoo collaboration, I guess we didn't have the
    foresight to expect this type of confusion and as most of you have found, getting spectra for the Hubble galaxies is not quite as easy as SDSS. This stems from the fact that these surveys are not characterized by any one group such as SDSS, but required a multitude of astronomer to gather and collect the data, which leads to the confusion in trying to access the spectra of the sources. As some of you have seen, the DEEP2 has a nice interface with which to use to investigate their galaxy spectra. I also think that the zCOSMOS group has something similar, but as for the GEMS, GOODS-S, and GOODS-N, I dont think such an interface exist, since these required many many different groups to get the data, and its strewn all over the interweb... I wanted to inform everyone that I have now made atlas images available for all the Hubble galaxies, using a simple URL command interface. For example if you want to see the atlas image for AEGIS galaxy 12027896 you would use the following URL  
    and just substitute your favorite object number to find out more information on that galaxy. I know this is not the complete solution, but at least its something. Hope this helps, :-)

    on another note, there are ~ 17,000 galaxies with high quality spectroscopic redshifts from the Hubble Images, out of a total ~ 490,000 sources. So a very small percentage have spectra availab

    Finding redshift and spectra for Hubble galaxies in various databases (when you have the ID number, like in the Hubble Zoo from 2011. "One particular issue with making colour HST images is that many surveys only produce data at two different wavelengths. Normally, colour images are made by choosing a different wavelength image for each of the three primary colours: red, green and blue. For the HST images we instead use one image for red, another for blue, and then just take the average of the two for green. "


  • rieta by rieta

    Hi there,
    many of the new Hubble images are no longer fun classifying as with every new one i think "I can't see anything, how am I supposed to classify". If I can't tell the difference from smooth to clumpy or spiral I'll get frustrated only. Sorry.
    Kind regards,


  • rollingronnie by rollingronnie

    Hi, I agree with Rieta. More than half of the new images are unclassifiable, but there's no button for that. I still need to give some sort of classification, which is useless, time consuming, and therefore quite frustrating.


  • ElisabethB by ElisabethB moderator

    This actually reminds me of the first Galaxy Zoo. We had tons of fuzzy blobs. And every now and then a beautiful spiral (or something) turned up. ๐Ÿ˜„

    As for the 'unclassifiables' : I click on features - no clumps - no edge on - no bar - no spiral - no bulge - nothing odd - and I certainly don't want to discuss this one ! ;D And I just move on to the next one, hoping that it will be this most amazing image ! ๐Ÿ˜„


  • Budgieye by Budgieye moderator in response to ElisabethB's comment.

    Yeah, the first Galaxy Zoo had little blobs, so boring to classify, then I found out that they were little bundles of extreme star-making activity.


  • cedartree by cedartree

    Hi there, I have noticed that I no longer can see how many classifications I have done. Does this feature no longer work?


  • ElisabethB by ElisabethB moderator in response to cedartree's comment.

    Hi Gisela

    The counters on your profile on the classification page are not updating.
    But you can still see how many classifications you have done. Go to the Zooniverse home page and hover over your username (top right) and click on Projects. No you can see how many classifications you have done for each of the projects you have worked on.


  • Budgieye by Budgieye moderator

    I didn't know that! Thanks ElisabethB ๐Ÿ˜ƒ


  • cedartree by cedartree

    Hi Elisabeth, thanks for the instructions!