2015A&A...583A.103G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:26:58

2015A&A...583A.103G - Astronomy and Astrophysics, volume 583A, 103-103 (2015/11-1)

Revealing the nature of star forming blue early-type galaxies at low redshift.

GEORGE K. and ZINGADE K.

Abstract (from CDS):

Star forming early-type galaxies with blue optical colours at low redshift can be used to test our current understanding of galaxy formation and evolution. We want to reveal the fuel and triggering mechanism for star formation in these otherwise passively evolving red and dead stellar systems. We undertook an optical and ultraviolet study of 55 star forming blue early-type galaxies, searching for signatures of recent interactions that could be driving the molecular gas into the galaxy and potentially triggering the star formation. We report here our results on star forming blue early-type galaxies with tidal trails and in close proximity to neighbouring galaxies that are evidence of ongoing or recent interactions between galaxies. There are 12 galaxies with close companions with similar redshifts, among which two galaxies are having ongoing interactions that potentially trigger the star formation. Two galaxies show a jet feature that could be due to the complete tidal disruption of the companion galaxy. The interacting galaxies have high star formation rates and very blue optical colours. Galaxies with no companion could have undergone a minor merger in the recent past. The recent or ongoing interaction with a gas-rich neighbouring galaxy could be responsible for bringing cold gas to an otherwise passively evolving early-type galaxy. The sudden gas supply could trigger the star formation, eventually creating a blue early-type galaxy. The galaxies with ongoing tidal interaction are blue and star forming, thereby implying that blue early-type galaxies can exist even when the companion is on flyby so does not end up in a merger.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: elliptical and lenticular, cD - galaxies: interactions - galaxies: star formation

Simbad objects: 15

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Number of rows : 15

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 2MASX J07560866+1722508 G 07 56 08.6653767273 +17 22 50.404948625           ~ 10 0
2 2MASX J08175629+4707190 G 08 17 56.2647455723 +47 07 19.563309495     16.5     ~ 12 0
3 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 152 0
4 2MASX J10252470+2725064 G 10 25 24.7042830694 +27 25 06.243560249           ~ 7 0
5 2MASX J10543792+5539457 G 10 54 37.8928761122 +55 39 45.872610863           ~ 7 0
6 NVSS J120616+633818 rG 12 06 17.0876519910 +63 38 19.069008374           ~ 12 0
7 2MASX J12202312+0851371 G 12 20 23.1200523732 +08 51 37.177912553           ~ 9 0
8 Mrk 217 G 12 35 02.6522270586 +66 22 33.430937362   16.0       ~ 15 0
9 2MASX J14143324+4045228 G 14 14 33.2310671480 +40 45 22.978965145           ~ 10 0
10 2MASX J14373292+0804427 G 14 37 32.9469626628 +08 04 42.993067377           ~ 9 0
11 2MASX J15171971+0319183 G 15 17 19.736 +03 19 18.92           ~ 8 0
12 2MASX J15500042+4158115 GiG 15 50 00.4650908243 +41 58 11.204792364   15.5       ~ 14 0
13 2MASX J15533553+3218203 G 15 53 35.5588171742 +32 18 20.488127759           ~ 8 0
14 2MASX J16181870+3406397 GiC 16 18 18.6843631720 +34 06 40.154773510   16.5       ~ 14 0
15 2MASX J22151621-0915475 EmG 22 15 16.1841906905 -09 15 47.505060530   15.90   14.74   ~ 13 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:26:58

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