Galaxy formation and evolution

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The peculiar motions of early-type galaxies in two distant regions -: V.: The Mg-σ relation, age and metallicity

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 303:4 (1999) 813-825

Authors:

M Colless, D Burstein, RL Davies, RK McMahan, RP Saglia, G Wegner
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The peculiar motions of early-type galaxies in two distant regions - II. The spectroscopic data

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 305:2 (1999) 259-296

Authors:

C Wegner, M Colless, RP Saglia, RK McMahan, RL Davies, D Burstein, G Baggley
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The spectral appearance of primeval galaxies

ASTR SOC P 200 (1999) 299-308

Authors:

B Guiderdoni, JEG Devriendt

Abstract:

The current and forthcoming observations of large samples of high-redshift galaxies selected according to various photometric and spectroscopic criteria can be interpreted in the context of galaxy formation, by means of models of evolving spectral energy distributions (SEDs). We hereafter present STARDUST which gives synthetic SEDs from the far UV to the submm wavelength range. These SEDs are designed to be implemented into semi-analytic models of galaxy formation.
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Ultraluminous IRAS Galaxies as seen with ISO

ESA SP PUBL 427 (1999) 833-838

Authors:

D Rigopoulou, R Genzel, D Lutz, D Kunze, AFM Moorwood, HWW Spoon, E Sturm, M Thornley, D Tran

Abstract:

We review the results of a major spectroscopic survey of nearby Starbursts and moderate redshift Ultraluminous IRAS Galaxies (ULIRGs) using ISO-SWS, ISOPHOT-S and ISOCAM (CVF) on board ISO. Detailed modeling reveals that massive stars, M-upper greater than or equal to 100 M-. are formed in most Starbursts in relatively short bursts (one or a few O star lifetimes). In the area of ULIRGs we address the main question of the dominant energy source as well as their evolution. We have found that the combination of mid-infrared fine structure line ratio with the strength of the PAH feature provides an excellent tool for discriminating between starburst and AGN activity. Our studies indicate that, on average, ULIRGs are mainly powered by Starbursts. The strength of the PAH feature is also used to probe for evolutionary effects. We find no evidence that ULIRGs found in advanced stages of merging are more AGN-like, as postulated by the classical evolutionary scenario. We suggest that local conditions (related to the energetics of the AGN) determine the dominance of the starburst or AGN.
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Ultraluminous infrared galaxies: Starburst vs. AGN

ADV SPACE RES 23:5/6 (1999) 1061-1064

Authors:

D Lutz, R Genzel, E Sturm, D Tran, D Rigopoulou, HWW Spoon, AFM Moorwood

Abstract:

We have obtained ISOPHOT-S low resolution mid-infrared spectra of a sample of 60 Ultraluminous Infrared Galaxies (ULIRGs). We use the strength of the 'PAH' mid-infrared features as a discriminator between starburst and AGN activity, and to probe for evolutionary effects. Observed ratios of PAH features in ULIRGs differ slightly from those in lower luminosity starbursts. We suggest that such PAH ratio changes relate to the conditions in the interstellar medium in these galaxies, and in particular to extinction. (C)1999 COSPAR. Published by Elsevier Science Ltd.
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