Mon. Not. R. Astron. Soc., 332, 422-434 (2002/May-2)
1.65-µm (H -band) surface photometry of galaxies - VIII. The near-IR κ space at z =0.
PIERINI D., GAVAZZI G., FRANZETTI P., SCODEGGIO M. and BOSELLI A.
Abstract (from CDS):
We present the distribution of a statistical sample of nearby galaxies in the κ -space (κ1∝logM, κ2∝logIe3M/L, κ3∝logM/L). Our study is based on near-IR (H -band: λ =1.65µm) observations, for the first time comprising early- and late-type systems. Our data confirm that the mean effective dynamical mass-to-light ratio M/L of the E+S0+S0a galaxies increases with increasing effective dynamical mass M, as expected from the existence of the Fundamental Plane relation. Conversely, spiral and Im/BCD galaxies show a broad distribution in M/L with no detected trend of M/L with M, the former galaxies having M/L values about twice larger than the latter, on average. For all the late-type galaxies, the M/L increases with decreasing effective surface intensity Ie, consistent with the existence of the Tully-Fisher relation. These results are discussed on the basis of the assumptions behind the construction of the κ -space and their limitations. Our study is complementary to a previous investigation in the optical (B -band: λ =0.44µm) and allows us to study wavelength dependences of the galaxy distribution in the κ -space. As a first result, we find that the galaxy distribution in the κ1-κ2 plane reproduces the transition from bulgeless to bulge-dominated systems in galaxies of increasing dynamical mass. Conversely, it appears that the M/L of late-types is higher (lower) than that of early-types with the same M in the near-IR (optical). The origins of this behaviour are discussed in terms of dust attenuation and star formation history.
2002 Blackwell Science Ltd
galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: spiral - galaxies: stellar content - infrared: galaxies
VizieR on-line data:
<Available at CDS (J/MNRAS/332/422): table1.dat>
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