The Near-infrared κ Space of Early-and Late-type Galaxies

Details The Near-infrared κ Space of Early-and Late-type Galaxies The Near-infrared κ Space of Early-and Late-type Galaxies

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..204..195p&link_type=abstract

The Extragalactic Infrared Background and its Cosmological Implications, Proceedings of IAU Symposium #204, held 15-18 August 20

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We present the near-infrared (H-band: λ =1.65 μ m) κ-space (κ1 ∝ log M, κ2 ∝ log Ie, κ3 ∝ log M/L) of high surface brightness early- and late-type galaxies, based on a sample of 419 objects optically selected in regions of the A262, Cancer and Virgo clusters and of the Coma Supercluster. We discuss the distribution of pressure- and rotationally-supported systems within this space and the ensuing scaling relations. We analyse the link between galaxy structure and star-formation history through a comparison of the loci occupied by galaxies of the Local Universe in both the near-infrared (this work) and optical κ-spaces. Our results support scenarios of galaxy formation and evolution with the following fundamental ingredients: collapsing proto-galactic systems are characterized by i) a bimodal distribution in mass and angular momentum and by ii) a mass-dependent characteristic star-formation time-scale.

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