Herschel-ATLAS: properties of dusty massive galaxies at low and high redshifts
We present a comparison of the physical properties of a rest-frame 250μm selected sample of massive, dusty galaxies from 0 < z < 5.3. Our sample comprises 29 high- redshift submillimetre galaxies (SMGs) from the literature, and 843 dusty galaxies at z < 0.5 from the Herschel -ATLAS, selected to have a similar stellar mass to the SMGs. The z > 1 SMGs have an average SFR of 390+80 −70M⊙yr−1 which is 120 times that of the low-redshift sample matched in stellar mass to the SMGs (SFR= 3.3 ± 0.2M⊙yr−1). The SMGs harbour a substantial mass of dust (1.2+0.3 −0.2×109M⊙), compared to (1.6± 0.1) × 108M⊙ for low-redshift dusty galaxies. At low redshifts the dust luminosity is dominated by the diffuse ISM, whereas a large fraction of the dust luminosity in SMGs originates from star-forming regions. At the same dust mass SMGs are offset towards a higher SFR compared to the low-redshift H-ATLAS galaxies. This is not only due to the higher gas fraction in SMGs but also because they are undergoing a more efficient mode of star formation, which is consistent with their bursty star-formation histories. The offset in SFR between SMGs and low-redshift galaxies is similar to that found in CO studies, suggesting that dust mass is as good a tracer of molecular gas as CO.
Subjectsgalaxies: fundamental parameters
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From major merger to radio galaxy: Low surface-brightness stellar counterpart to the giant HI ring around B2 0648+27 (Research Note) Emonts, B.H.C.; Morganti, R.; van Gorkom, J.H.; Oosterloo, T.A.; Brogt, E.; Tadhunter, C.N. (University of Canterbury. University Centre for Teaching and LearningUniversity of Canterbury. AVC Research Office, 2008)We present the detection of a low surface-brightness stellar counterpart to an enormous (190 kpc) ring of neutral hydrogen (HI) gas that surrounds the nearby radio galaxy B2 0648+27. This system is currently in an ...
Emonts, B.H.C.; Tadhunter, C.N.; Morganti, R.; Oosterloo, T.A.; Holt, J.; Brogt, E.; van Moorsel, G. (University of Canterbury. University Centre for Teaching and Learning, 2009)We present new observational results that conclude that the nearby radio galaxy B2 0722+30 is one of the very few known disc galaxies in the low–redshift Universe that host a classical double–lobed radio source. In this ...
Emonts, B.H.C.; Morganti, R.; Struve, C.; Oosterloo, T.A.; van Moorsel, G.; Tadhunter, C.N.; van der Hulst, J.M.; Brogt, E.; Holt, J.; Mirabal, N. (University of Canterbury. AVC Research Office, 2010)n important aspect of solving the long-standing question as to what triggers various types of active galactic nuclei (AGN) involves a thorough understanding of the overall properties and formation history of their host ...