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The new galaxy evolution paradigm revealed by the Herschel Surveys

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Date
01/2018
Author
Eales, Stephen
Smith, Dan
Bourne, Nathan
Loveday, Jon
Rowlands, Kate
Werf, Paul van der
Driver, Simon
Dunne, Loretta
Dye, Simon
Furlanetto, Cristina
Ivison, R. J.
Maddox, Steve
Robotham, Aaron
Smith, Matthew W. L.
Taylor, Edward N.
Valiante, Elisabetta
Wright, Angus
Cigan, Philip
Zotti, Gianfranco De
Jarvis, Matt J.
Marchetti, Lucia
Michałowski , Michał J.
Phillipps, Steve
Viaene, Sebastian
Vlahakis, Catherine
Keywords
Galaxies: evolution
QB Astronomy
QC Physics
3rd-DAS
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Abstract
The Herschel Space Observatory has revealed a very different galaxyscape from that shown by optical surveys which presents a challenge for galaxy-evolution models. The Herschel surveys reveal (1) that there was rapid galaxy evolution in the very recent past and (2) that galaxies lie on a single Galaxy Sequence (GS) rather than a star-forming ‘main sequence’ and a separate region of ‘passive’ or ‘red-and-dead’ galaxies. The form of the GS is now clearer because far-infrared surveys such as the Herschel ATLAS pick up a population of optically red star-forming galaxies that would have been classified as passive using most optical criteria. The space-density of this population is at least as high as the traditional star-forming population. By stacking spectra of H-ATLAS galaxies over the redshift range 0.001 < z < 0.4, we show that the galaxies responsible for the rapid low-redshift evolution have high stellar masses, high star-formation rates but, even several billion years in the past, old stellar populations – they are thus likely to be relatively recent ancestors of early-type galaxies in the Universe today. The form of the GS is inconsistent with rapid quenching models and neither the analytic bathtub model nor the hydrodynamical EAGLE simulation can reproduce the rapid cosmic evolution. We propose a new gentler model of galaxy evolution that can explain the new Herschel results and other key properties of the galaxy population.
Citation
Eales , S , Smith , D , Bourne , N , Loveday , J , Rowlands , K , Werf , P V D , Driver , S , Dunne , L , Dye , S , Furlanetto , C , Ivison , R J , Maddox , S , Robotham , A , Smith , M W L , Taylor , E N , Valiante , E , Wright , A , Cigan , P , Zotti , G D , Jarvis , M J , Marchetti , L , Michałowski , M J , Phillipps , S , Viaene , S & Vlahakis , C 2018 , ' The new galaxy evolution paradigm revealed by the Herschel Surveys ' , Monthly Notices of the Royal Astronomical Society , vol. 474 , no. 3 , pp. 3507-3524 . https://doi.org/10.1093/mnras/stx2548
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stx2548
ISSN
0035-8711
Type
Journal article
Rights
© 2017, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stx2548
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  • University of St Andrews Research
URL
http://arxiv.org/abs/1710.01314v3
URI
http://hdl.handle.net/10023/12570

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