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Published November 2010 | Published
Journal Article Open

HerMES: SPIRE detection of high-redshift massive compact galaxies in GOODS-N field


We have analysed the rest-frame far-infrared properties of a sample of massive (M_★ > 10^(11) M_⊙) 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 (~50–100 M_⊙ yr^(−1)) is substantially (a factor ~3) lower than the mean value presented by disc-like galaxies (~250–300 M_⊙ yr^(−1)).

Additional Information

© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2010 October 1. Received 2010 August 22; in original form 2010 July 16. Article first published online: 25 Oct 2010. Special thanks to E. Ricciardelli, J. Fritz and J.M. Varela-Lopez for useful discussions and technical support. The data presented in this Letter will be released through the Herschel data base in Marseille HeDaM (hedam.oamp.fr/herMES). SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including University of Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, University of Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCLMSSL, UKATC, University of Sussex (UK); Caltech, JPL, NHSC, University Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC (UK) and NASA (USA). AC acknowledges a grant from the Spanish MCINN: ESP2007-65812-C02-02.

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