2001A&A...369..742C


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.25CET09:24:53

2001A&A...369..742C - Astronomy and Astrophysics, volume 369, 742-749 (2001/4-3)

On the shape of luminosity profiles of dwarf galaxies as a distance indicator: the NGC 5044 Group revisited.

CELLONE S.A. and BUZZONI A.

Abstract (from CDS):

Conflicting evidence has been recently raised in order to use surface brightness profiles of dwarf galaxies as a distance indicator. In this paper we discuss in some detail the main error sources in profile fitting procedures for galaxies with more than one physical component, showing their impact on the resulting shape parameters. The apparent tight coupling between shape parameter and (pseudo) scalelength in the Sersic law is especially dealt with, demonstrating that this relationship is mostly a mathematical artifact, thus throwing doubts on its usefulness as a distance indicator. Galaxies departing from the luminosity-shape relation are shown to exhibit different kinds of intrinsic peculiarities, thus prompting for better securing the empirical constraints to conform observational samples. As a relevant example in this sense, new observations of the galaxy N50 in the NGC 5044 Group are presented. We show that this object may be at an intermediate evolutionary stage between blue compact dwarfs (BCDs) and dwarf ellipticals (dEs).

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: NGC 5044 Group - galaxies: distances and redshifts, elliptical and lenticular, fundamental parameters, photometry, structure

CDS comments: Galaxies N are [FS90] NGC 5044, Table 1: knots K 1 to K 1 0 not in SIMBAD

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO B0125-0635 QSO 01 27 35.5241670251 -06 19 35.428005150 14.75 15.05 14.48 14.06 13.70 ~ 90 0
2 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1568 0
3 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5909 0
4 6dFGS gJ131356.2-161624 GiG 13 13 56.228 -16 16 24.42   15.5       ~ 18 0
5 6dFGS gJ131417.3-162619 GiG 13 14 17.333 -16 26 18.91   15.9       ~ 13 0
6 NAME NGC 5044 Group GrG 13 14 22.7 -16 32 04           ~ 171 0
7 LEDA 83827 GiG 13 14 31.1 -16 22 48   15.4       ~ 13 0
8 6dFGS gJ131434.9-162929 GiG 13 14 34.852 -16 29 28.92   15.8       ~ 15 0
9 LEDA 83830 GiG 13 14 35.7 -16 34 51   16.5       ~ 8 0
10 LEDA 83860 GiG 13 15 21.6 -16 36 08   17.4       ~ 9 0
11 NGC 5044 BiC 13 15 23.969 -16 23 08.00   11.9   10.74   ~ 456 0
12 [FS90] NGC 5044 95A GiG 13 15 38.6 -16 38 27           ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.10.25-09:24:53

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