Galaxy formation and evolution

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Herschel-ATLAS Galaxy Counts and High-redshift Luminosity Functions: The Formation of Massive Early-type Galaxies

\apj 742 (2011) 24-24

Authors:

A Lapi, J González-Nuevo, L Fan, A Bressan, G De Zotti, L Danese, M Negrello, L Dunne, S Eales, S Maddox, R Auld, M Baes, DG Bonfield, S Buttiglione, A Cava, DL Clements, A Cooray, A Dariush, S Dye, J Fritz, D Herranz, R Hopwood, E Ibar, R Ivison, MJ Jarvis, S Kaviraj, M López-Caniego, M Massardi, MJ Micha lowski, E Pascale, M Pohlen, E Rigby, G Rodighiero, S Serjeant, DJB Smith, P Temi, J Wardlow, P van der Werf
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The environment and characteristics of low-redshift galaxies detected by the Herschel-ATLAS

\mnras 418 (2011) 64-73-64-73

Authors:

A Dariush, L Cortese, S Eales, E Pascale, MWL Smith, L Dunne, S Dye, D Scott, R Auld, M Baes, J Bland-Hawthorn, S Buttiglione, A Cava, DL Clements, A Cooray, G Dezotti, S Driver, J Fritz, HL Gomez, A Hopkins, R Hopwood, RJ Ivison, MJ Jarvis, DH Jones, L Kelvin, HG Khosroshahi, J Liske, J Loveday, S Maddox, BF Madore, MJ Micha lowski, P Norberg, S Phillipps, M Pohlen, CC Popescu, M Prescott, E Rigby, A Robotham, G Rodighiero, M Seibert, DJB Smith, P Temi, RJ Tuffs, PP van der Werf
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Mapping the Galactic Center with Gravitational Wave Measurements using Pulsar Timing

(2011)

Authors:

Bence Kocsis, Alak Ray, Simon Portegies Zwart
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Four IRAC Sources with an Extremely Red H-[3.6] Color: Passive or Dusty Galaxies at z>4.5?

(2011)

Authors:

J-S Huang, XZ Zheng, D Rigopoulou, G Magdis, GG Fazio, T Wang
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Goods-Herschel: Gas-to-dust mass ratios and CO-TO-H2 conversion factors in normal and starbursting galaxies at high-z

Astrophysical Journal Letters 740:1 (2011)

Authors:

GE Magdis, E Daddi, D Elbaz, M Sargent, M Dickinson, H Dannerbauer, H Aussel, F Walter, HS Hwang, V Charmandaris, J Hodge, D Riechers, D Rigopoulou, C Carilli, M Pannella, J Mullaney, R Leiton, D Scott

Abstract:

We explore the gas-to-dust mass ratio (M gas/M d) and the CO luminosity-to-M gas conversion factor (αCO) of two well-studied galaxies in the Great Observatories Origins Deep Survey North field that are expected to have different star-forming modes, the starburst GN20 at z = 4.05 and the normal star-forming galaxy BzK-21000 at z = 1.52. Detailed sampling is available for their Rayleigh-Jeans emission via ground-based millimeter (mm) interferometry (1.1-6.6mm) along with Herschel PACS and SPIRE data that probe the peak of their infrared emission. Using the physically motivated Draine & Li models, as well as a modified blackbody function, we measure the dust mass (M dust) of the sources and find (2.0+0.7-0.6 × 109) M ∞ for GN20 and (8.6+0.6-0.9 × 108) M ∞ for BzK-21000. The addition of mm data reduces the uncertainties of the derived M dust by a factor of ∼2, allowing the use of the local M gas/M d versus metallicity relation to place constraints on the αCO values of the two sources. For GN20 we derive a conversion factor of αCO < 1.0 M ∞ pc-2(Kkms-1)-1, consistent with that of local ultra-luminous infrared galaxies, while for BzK-21000 we find a considerably higher value, αCO ∼4.0 M ∞ pc-2(Kkms-1)-1, in agreement with an independent kinematic derivation reported previously. The implied star formation efficiency is ∼25 L ∞/M ∞ for BzK-21000, a factor of ∼5-10 lower than that of GN20. The findings for these two sources support the existence of different disk-like and starburst star formation modes in distant galaxies, although a larger sample is required to draw statistically robust results. © 2011. The American Astronomical Society. All rights reserved.
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