Galaxy formation and evolution

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The Central Region of M83

ArXiv 0801.1213 (2008)

Authors:

RCW Houghton, N Thatte

Abstract:

We combine VLT/ISAAC NIR spectroscopy with archival HST/WFPC2 and HST/NICMOS imaging to study the central 20"x20" of M83. Our NIR indices for clusters in the circumnuclear star-burst region are inconsistent with simple instantaneous burst models. However, models of a single burst dispersed over a duration of 6 Myrs fit the data well and provide the clearest evidence yet of an age gradient along the star forming arc, with the youngest clusters nearest the north-east dust lane. The long slit kinematics show no evidence to support previous claims of a second hidden mass concentration, although we do observe changes in molecular gas velocity consistent with the presence of a shock at the edge of the dust lane.
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The properties of 70micron selected high-redshift galaxies in the Extended Groth Strip

(2008)

Authors:

M Symeonidis, SP Willner, D Rigopoulou, J-S Huang, GG Fazio, MJ Jarvis
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Detecting Virialization Shocks Around Galaxy Clusters Through the SZ Effect

Chapter in Relativistic Astrophysics Legacy and Cosmology – Einstein’s, Springer Nature (2008) 334-336

Authors:

B Kocsis, Z Haiman, Z Frei
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Finding the Electromagnetic Counterparts of Standard Sirens

Chapter in Relativistic Astrophysics Legacy and Cosmology – Einstein’s, Springer Nature (2008) 82-86

Authors:

B Kocsis, Z Frei, Z Haiman, K Menou
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IRAC photometric analysis and the mid-IR photometric properties of Lyman-break galaxies

Monthly Notices of the Royal Astronomical Society 386:1 (2008) 11-21

Authors:

GE Magdis, D Rigopoulou, JS Huang, GG Fazio, SP Willner, MLN Ashby

Abstract:

We present photometric analysis of deep mid-infrared (mid-IR) observations obtained by Spitzer/IRAC covering the fields Q1422+2309, Q2233+1341, DSF2237a,b, HDFN, SSA22a,b and B20902+34, giving the number counts and the depths for each field. In a sample of 751 Lyman-break galaxies (LBGs) lying in those fields, 443, 448, 137 and 152 are identified at 3.6-, 4.5-, 5.8-, 8.0-μm IRAC bands, respectively, expanding their spectral energy distribution to rest-near-IR and revealing that LBGs display a variety of colours. Their rest-near-IR properties are rather inhomogeneous, ranging from those that are bright in IRAC bands and exhibit [R] - [3.6] > 1.5 colours to those that are faint or not detected at all in IRAC bands with [R] - [3.6] < 1.5 colours and these two groups of LBGs are investigated. We compare the mid-IR colours of the LBGs with the colours of star-forming galaxies and we find that LBGs have colours consistent with star-forming galaxies at z ∼ 3. The properties of the LBGs detected in the 8-μm IRAC band (rest-frame K band) are examined separately, showing that they exhibit redder [R] - [3.6] colours than the rest of the population and that although in general, a multiwavelength study is needed to reach more secure results, IRAC 8-μm band can be used as a diagnostic tool, to separate high z, luminous AGN-dominated objects from normal star-forming galaxies at z ∼ 3. © 2008 RAS.
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