Harvard-Smithsonian Center for Astrophysics (CfA) astronomer Glen Petitpas was a member of a large team of astronomers who used the SCUBA-2 (Submillimeter Common User Bolometer Array) instrument to confirm 188 of the reddest of these sources as indeed being distant, dusty star formation galaxies, typically so far away that their light has been traveling towards us for over eleven billion years, and so bright that they must be making stars at a rate many thousands of times faster than does the Milky Way. In a related paper, Petitpas was joined by CfA astronomers Mark Gurwell, Giovanni Fazio, and David Wilner and their colleagues to use the Submillimeter Array to image some distant SCUBA-2 galaxies (although a set that is a bit closer than the above sample: their light has only been traveling for a bit over ten billion years). They targeted seventy galaxies with the SMA and detected sixty-two of them, including three pairs of galaxies that can be classified as colliding systems (the others may also include some mergers that are not spatially separable). The scientists show that the descendants of such huge galaxies in our local universe are probably massive elliptical galaxies, and that about ten percent of their stars probably formed in short bursts of activity in this earlier phase of their evolution. Publications:
“High-Resolution SMA Imaging of Bright Submillimetre Sources from the SCUBA-2 Cosmology Legacy Survey” by Ryley Hill, Scott C. Chapman, Douglas Scott, Glen Petitpas, Ian Smail, Edward L. Chapin, Mark A. Gurwell, Ryan Perry, Andrew W. Blain, Malcolm N. Bremer, Chian-Chou Chen, James S. Dunlop, Duncan Farrah, Giovanni G. Fazio, James E. Geach, Paul Howson, R. J. Ivison, Kevin Lacaille, Michał J. Michałowski, James M. Simpson, A. M. Swinbank, Paul P. van der Werf and David J. Wilner, 21 March 2018, MNRAS.DOI: 10.1093/mnras/sty746“Red, Redder, Reddest: SCUBA-2 Imaging of Colour-Selected Herschel Sources” by S Duivenvoorden, S Oliver, J M Scudder, J Greenslade, D A Riechers, S M Wilkins, V Buat, S C Chapman, D L Clements, A Cooray, K E K Coppin, H Dannerbauer, G De Zotti, J S Dunlop, S A Eales, A Efstathiou, D Farrah, J E Geach, W S Holland, P D Hurley, R J Ivison, L Marchetti, G Petitpas, M T Sargent, D Scott, M Symeonidis, M Vaccari, J D Vieira, L Wang, J Wardlow and M Zemcov, 15 March 2018, MNRAS.DOI: 10.1093/mnras/sty691
