HerMES: SPIRE detection of high-redshift massive compact galaxies in GOODS-N field
Altieri, B.; Elbaz, D.; Pérez-Fournon, I.; Rodighiero, G.; Valtchanov, I.; Ivison, R. J.; Clements, D. L.; Scott, D.; Burgarella, D.; Wang, L.; Franceschini, A.; Bock, J.; Cooray, A.; Solares, E. A. González; Ibar, E.; Marchetti, L.; Oliver, S. J.; Page, M. J.; Rigopoulou, D.; Roseboom, I. G.; Symeonidis, M.; Vaccari, M.; Auld, R.; Cava, A.; Eales, S.; Amblard, A.; Castro-Rodríguez, N.; Chanial, P.; Cirasuolo, M.; Glenn, J.; Griffin, M.; Morrison, G. E.; Mortier, A. M. J.; Papageorgiou, A.; Pearson, C. P.; Pohlen, M.; Rawlings, J. I.; Raymond, G.; Rowan-Robinson, M.; Seymour, N.; Smith, A. J.; Tugwell, K. E.; Vigroux, L.; Wright, G.; Vieira, J. D.; Conselice, C. J.; Buitrago, F.; Brisbin, D.; Trujillo, I.; Ferrero, P.
Spain, Italy, United Kingdom, United States, France, Canada
Abstract
We have analysed the rest-frame far-infrared properties of a sample of massive (M* > 1011Msolar) galaxies at 2 <~ z <~ 3 in the Great Observatories Origins Deep Survey-North (GOODS-N) field using the Spectral and Photometric Imaging Receiver (SPIRE) instrument aboard the Herschel Space Observatory. To conduct this analysis we take advantage of the data from the Herschel Multi-tiered Extragalactic Survey (HerMES) key programme. The sample comprises 45 massive galaxies with structural parameters characterized with HST NICMOS-3. We study detections at submm Herschel bands, together with Spitzer 24-μm data, as a function of the morphological type, mass and size. We find that 26/45 sources are detected at MIPS 24 μm and 15/45 (all MIPS 24-μm detections) are detected at SPIRE 250 μm, with disc-like galaxies more easily detected. We derive star formation rates (SFRs) and specific star formation rates (sSFRs) by fitting the spectral energy distribution of our sources, taking into account non-detections for SPIRE and systematic effects for MIPS derived quantities. We find that the mean SFR for the spheroidal galaxies (~50-100Msolaryr-1) is substantially (a factor ~3) lower than the mean value presented by disc-like galaxies (~250-300Msolaryr-1).