Astronomy and Astrophysics, volume 372, 29-49 (2001/6-2)
1.65 µm ((H)-band) surface photometry of galaxies. VII. Dwarf galaxies in the Virgo Cluster.
GAVAZZI G., ZIBETTI S., BOSELLI A., FRANZETTI P., SCODEGGIO M. and MARTOCCHI S.
Abstract (from CDS):
We present near-infrared H-band (1.65µm) observations and surface brightness profile decompositions for 75 faint (13.5≲mp≲18.5) galaxies, primarily taken among dwarf Ellipticals members of the Virgo cluster, with some Centaurus Cluster members, a BCD and two peculiar galaxies taken as fillers. We model their surface brightness profiles with a de Vaucouleurs (D), exponential (E), mixed (bulge+disk or M) or truncated (T) law, and we derive for each galaxy the H band effective surface brightness (µe) and effective radius (re), the asymptotic total magnitude HT and the light concentration index C31, defined as the ratio between the radii that enclose 75% and 25% of the total light HT. For a subsample we compare the NIR surface photometry with similar data taken in the B and V bands, and we give the B-H and B-V color profiles. Combining the present data with those previously obtained by our group (1157 objects) we analyze the NIR properties of a nearly complete sample, representative of galaxies of all morphological types, spanning 4 decades in luminosity. We confirm our earlier claim that the presence of cusps and extended haloes in the light profiles (C31>5) is a strong, non-linear function of the total luminosity. We also find that: i) among dE and dS0 galaxies D profiles are absent; 50% of the decompositions are of type M, the remaining being of type E or T. ii) Less than 50% of the giant elliptical galaxies have pure D profiles, the majority being represented by M profiles. iii) Most giant galaxies (from elliptical to Sb) have M profiles. iv) Most of late type spirals (Scd to BCD) have either E or T profiles. v) The type of decomposition is a strong function of the total H band luminosity, independent of the Hubble classification: the fraction of type E decompositions decreases with increasing luminosity, while those of type M increase with luminosity. Pure D profiles are absent in the low luminosity range LH<1010L☉ and become dominant above 1011L☉, while T profiles are present only among low luminosity galaxies. vi) We find that dE-peculiar galaxies have structural parameters indistinguishable from those of late-type dwarfs, thus they might represent the missing link between dEs and dIs.
galaxies: fundamental parameters - galaxies: photometry - infrared: galaxies
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