2002A&A...390..891B


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET20:12:47

2002A&A...390..891B - Astronomy and Astrophysics, volume 390, 891-915 (2002/8-2)

Massive (?) starburst hosts of blue compact galaxies (BCGs). Optical/near-IR observations of 4 BCGs and their companions.

BERGVALL N. and OESTLIN G.

Abstract (from CDS):

We present optical spectroscopy and deep optical/near-IR photometry of 4 luminous metal-poor blue compact galaxies (BCGs) and two of their companions. With the aid of spectral evolutionary models (SEMs) and structural parameters derived from the surface photometry we discuss the properties of the central starbursts and the halo populations of the galaxies. Special attention is paid to the effects of dust, chemical inhomogeneities and contamination of nebular emission to the halo light. The optical/near-IR colour index profiles show a sharp distinction between the starburst and the host. The hosts have luminosity profiles characteristic of massive ellipticals and remarkably red colours, typical of a relatively metal-rich stellar population of old age. These properties are in conflict with the relatively low luminosities. The situation can best be explained if the hosts have an unusually large amount of dark matter that can hinder the outflow of metals from the system.The indicated difference in metallicity between the halo and the young starburst disproves the recurrent burst scenario and supports different origins of the two populations. We conclude that these BCGs are undergoing mergers between early type galaxies/thick disks and gas-rich galaxies or intergalactic HI clouds, in many respects reminiscent of a retarded formation of massive ellipticals.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: starburst - galaxies: dwarfs

Simbad objects: 9

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Number of rows : 9

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 ESO 350-38 AGN 00 36 52.489 -33 33 17.23   14.31 14.41 13.49   ~ 284 0
2 ESO 480-12 IG 02 54 45.044 -25 06 37.25   14.85   14.38   ~ 22 0
3 SBSG 0335-052 bCG 03 37 44.04 -05 02 38.5     16.65     ~ 423 1
4 ESO 118-34 GiG 04 40 17.485 -58 44 39.40   13.50 13.52 12.67 13.4 ~ 47 0
5 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 978 1
6 ESO 338-4B G 19 27 31.677 -41 38 53.40   15.66 15.0 15.04   ~ 8 1
7 ESO 338-4 IG 19 27 58.338 -41 34 30.81   13.55 13.21 13.14 13.43 ~ 204 1
8 ESO 400-43 bCG 20 37 41.931 -35 29 07.94   14.26 14.34 13.93 13.96 ~ 46 2
9 ESO 400-43B G 20 37 51.255 -35 29 43.16   16.25 15.7 15.51   ~ 8 0

    Equat.    Gal    SGal    Ecl

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2019.12.12-20:12:47

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