Galaxy Zoo Starburst Talk

Popular science articles about galaxy evolution and/or post-quenched galaxies

  • trouille by trouille scientist, moderator, admin

    Dear all,

    Anyone have recommendations for well-written, informative popular science articles about galaxy evolution and/or post-quenched galaxies? If so, please post them here. The more context we have for our research, the better.



  • Ex103 by Ex103


    Are you talking about stuff like this? (more of a blog site - however)

    Or more like. . .

    Other science papers ? IOPScience - Research in Astronomy and Astrophysics?

    Articles: <<< >>> <<< I could only read the summary of the article


  • Ex103 by Ex103

    Continued. . .

    Ok I'm very tired now. . . and not feeling well . . . Maybe I'll start-up the old research person in me again tomorrow or something . . .

    To bad I'm not any where near a well stocked library . . .


  • JeanTate by JeanTate

    Those are some very cool articles, Ex103! 😃

    The Nature link is a bit worrisome though; you have to pay (a lot!) to actually get the paper! 😦

    When we get to Stage 3 a) ("Read background articles to provide a context for our results and be able to compare our results with other research studies on the topic."), this could be a bit of a problem ... only those with access to journal papers will be able to do it.

    Or not?


  • KyleKelly by KyleKelly

    The postquench blogspot has the link for the full PDFs via dropbox. I assumed that this thread is intended for non-scientific journal articles ( which should go here ).

    I agree that the relevant articles should be updated in the dropbox as well for those not affiliated with institutions.


  • Ex103 by Ex103

    The 'article' from Nature is more of a 'preamble type summery' of a actual study - paper that should have been under the science papers part of my post - vs - the articles. - My bad for tossing it where it is. I had it categorized out but probably was too tired at the time and slipped it in when I posted.

    With me I suppose I tend to look at 'most' magazine articles and the like as 'summaries' based off of scientific papers or popular theory / concept. Most of them leave out the majority of the calculations and what not that either reinforced or disproved the subject. When one digs for info into these things, if you dig deep enough and follow the 'bread crumbs' back far enough one generally finds source information. Ugh. Well I suppose I'm babbling again.

    Ok back to articles. . . sense if I don't get this down now something else is going to interrupt me . . lol

    Popular Science - <<< >>>

    Please bare in mind that ALMA is a radio telescope array for those that don't know.

    Ok that's all I've got. - Bare in mind I don't have permission from these sites to copy and post their articles so linking to their sites was done with the fullest respect to their author's work.


  • mzevin1 by mzevin1 scientist, moderator

    Like kylekelly said, the article summaries on the postquench blogspot are a good starting off point for background information on post-quenched galaxies and current research on these objects with the utilization of galaxy zoo. The full articles are much more in-depth and can be found in here.

    Some other popsci articles I came across that can provide background info (sorry if there are any repeats from earlier posts):

    On starburst galaxies and how their star formation is quenched:

    More on galaxy evolution:'


  • Freethesouls by Freethesouls

    Hubble’s COSMOS survey solves “quenched” galaxy mystery


  • mzevin1 by mzevin1 scientist, moderator in response to Freethesouls's comment.

    Was just going to post this too - thanks!


  • jtmendel by jtmendel scientist, moderator

    Not a popular science article, but for those interested here's a link to the paper mentioned in the link above regarding COSMOS and quenched galaxies:


  • Freethesouls by Freethesouls

    Galaxies appear to have matured much sooner in the early universe than previously estimated, adding intriguing twists to the history that astronomers are compiling of the growth and evolution of these vast collections of stars.

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    Using data gathered by the Hubble Space Telescope, a team of scientists found that galaxies of all sizes had fallen into two main shapes – disks and spherical – by 2.5 billion years after the big bang (an enormous release of energy that cosmologists say gave rise to the universe humans observe today).

    The analysis by BoMee Lee at the University of Massachusetts at Amherst and her colleagues clearly shows that these galactic geezers not only were common some 11 billion years ago, but also had emerged as a distinct group within a couple of billion years after the earliest known galaxies formed, says Mauro Giavalisco, an astronomy professor at UMass Amherst and Ms. Lee's PhD adviser.

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    The challenge to understanding galaxy evolution: Spherical galaxies essentially are "red and dead." Their stars are almost as old the universe. And some process has quenched their star formation – a process that could involve supermassive black holes at their galactic centers or the cumulative effect of intense star formation prior to becoming spherical galaxies.

    The new analysis "provides compelling evidence that quenching is fast and incredibly effective in spheroids," Dr. Giavalisco says. Now researchers have to figure out why.

    The results stem from the Hubble Space Telescope's CANDELS project, short for the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey. It's the largest observing program in the storied observatory's history. Its main objective is to track the evolution of galaxies from less than 1 billion years after the big bang through today.

    The survey uses cameras on Hubble that capture visible light and near-infrared light. Looking in the infrared is particularly important because these galaxies appear at distances of more than 11 billion light-years away. Because the universe expands with increasing speed with distance, light from a galaxy that would appear as visible light or as ultraviolet light – an indicator of star formation – if the galaxy were nearby gets stretched into the infrared region of the spectrum. Spherical galaxies, which tend to be red to begin with, can be fiendishly difficult to detect at such distances because their light gets driven even deeper in the infrared portion of the spectrum.

    The three-year project began in 2010 and has in essence stared at the sky for the equivalent of four months.

    Star formation requires the presence of cold, dense gas, which under favorable conditions can collapse to form stars. If the gas gets too hot, star formation stops.

    Researchers have offered up two possible ways to generate such heat: One is the enormous radiation from supermassive black holes in galactic cores; the other is the formation of large numbers of very massive stars in a relatively confined regions.

    These processes can heat gas to temperatures ranging from millions to 1 billion degrees. Once gas reaches those temperatures, cooling it essentially takes the lifetime of the universe.

    "This is why it's really important to understand when these galaxies formed and when galaxies started to diversify into spirals and spheroids," Giavalisco says.

    Other researchers had uncovered evidence that the galaxy types began to diversify as early as 8 billion years ago, but the studies also focused on low-mass galaxies, rather than the full range of sizes.

    This latest work represents "a robust statistical assessment" showing that this divergence, known as the Hubble sequence, was happening much earlier than previous studies had indicated, Giavalisco says.

    Whatever theorists devise to explain the quenching, it will have to include a process that happens very quickly, he concludes.

    The results have just been published online by the Astrophysical Journal.


  • ivywong by ivywong scientist

    Recent one on Hubble's observations of "jellyfish galaxies" and the effect of ram pressure stripping at higher redshifts (beyond local clusters like Virgo, Coma etc)