2010MNRAS.408..254S


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST12:47:55

2010MNRAS.408..254S - Mon. Not. R. Astron. Soc., 408, 254-271 (2010/October-2)

Early-type galaxies at large galactocentric radii - I. Stellar kinematics and photometric properties.

SPOLAOR M., HAU G.K.T., FORBES D.A. and COUCH W.J.

Abstract (from CDS):

We present the results of a combined analysis of the kinematic and photometric properties at large galactocentric radii of a sample of 14 low-luminosity early-type galaxies in the Fornax and Virgo clusters. From Gemini South GMOS long-slit spectroscopic data, we measure radial profiles of the kinematic parameters vrot, σ, h3 and h4out to ∼1-3 effective radii. Multiband imaging data from the Hubble Space Telescope/ACS are employed to evaluate surface brightness profiles and isophotal shape parameters of ellipticity, position angle and discyness/boxiness. The galaxies are found to host a cold and old stellar component which extend to the largest observed radii and that is the dominant source of their dynamical support. The prevalence of discy-shaped isophotes and the radial variation of their ellipticity are signatures of a gradual gas dissipation. An early star-forming collapse appears to be the main mechanism acting in the formation of these objects. Major mergers are unlikely to have occurred in these galaxies. We cannot rule out a minor merging origin for these galaxies, but a comparison of our results with model predictions of different merger categories places some constraints on the possible merger progenitors. These merger events are required to happen at high-redshift (i.e. z ≥ 1), between progenitors of different mass ratio (at least 3:1) and containing a significant amount of gas (i.e. ≥10 per cent). A further scenario is that the low-luminosity galaxies were originally late-type galaxies, whose star formation has been truncated by removal of gas and subsequently the disc has been dynamically heated by high-speed encounters in the cluster environment.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): galaxies: dwarf - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: formation - galaxies: kinematics and dynamics - galaxies: photometry

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 1375 GiG 03 35 16.8019706983 -35 15 56.379169010 13.50 13.02 12.40 11.74   ~ 143 1
2 IC 1963 GiG 03 35 31.029 -34 26 49.55   12.90   11.71   ~ 109 0
3 NGC 1381 GiP 03 36 31.6595958424 -35 17 42.745665386 12.90 12.47 11.50 11.02   ~ 216 1
4 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1598 0
5 NGC 1428 GiG 03 42 22.9 -35 09 12   13.77   12.49   ~ 90 0
6 ESO 358-59 GiG 03 45 03.554 -35 58 21.37   14.08   12.85   ~ 98 0
7 ESO 359-2 GiG 03 50 36.723 -35 54 33.51   14.48   13.49   ~ 68 0
8 NAME M96 Group GrG 10 48 +13.3           ~ 286 0
9 NGC 4318 GiG 12 22 43.301 +08 11 54.12   14.1       ~ 122 0
10 NGC 4387 GiG 12 25 41.6768872639 +12 48 37.809497625 13.42 13.01 12.12   10.87 ~ 374 1
11 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6009 0
12 NGC 4434 GiG 12 27 36.680 +08 09 15.52   13.2       ~ 237 0
13 NGC 4458 GiP 12 28 57.532 +13 14 30.90 13.27 12.93 12.07     ~ 392 2
14 NGC 4464 GiG 12 29 21.313 +08 09 23.63   13.5       ~ 219 0
15 UGCA 283 GiG 12 30 31.985 +12 29 24.85   14.5       ~ 389 0
16 NGC 4515 GiG 12 33 04.944 +16 15 55.76   13.3       ~ 135 0
17 NGC 4551 GiP 12 35 37.980 +12 15 50.44 13.49 12.97 12.02     ~ 337 1

    Equat.    Gal    SGal    Ecl

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2021.04.14-12:47:55

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