2012A&A...538A..61M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST01:01:36

2012A&A...538A..61M - Astronomy and Astrophysics, volume 538A, 61-61 (2012/2-1)

Extranuclear Hα -emitting complexes in low-z (U)LIRGs: precursors of tidal dwarf galaxies?

MIRALLES-CABALLERO D., COLINA L. and ARRIBAS S.

Abstract (from CDS):

This paper characterizes the physical and kinematic properties of external massive star-forming regions in a sample of (U)LIRGs. We use high angular resolution ACS images from the Hubble Space Telescope (HST) in F435W (∼B) and F814W (∼I) bands, as well as Hα -line emission maps obtained with integral field spectroscopy. We find 31 external Hα -emitting (i.e., young star-forming) complexes in 11 (U)LIRGs. These complexes have in general similar sizes (from few hundreds of pc to about 2kpc), luminosities (MF435W←10.65 and L(Hα)>1039L), and metallicities (12+log(O/H)∼8.5-8.7) to extragalactic giant HII regions and TDG candidates found in less luminous mergers and compact groups of galaxies. We assess the mass content and the likelihood of survival as TDGs of the 22 complexes with simple structures in the HST images based on their photometric, structural, and kinematic properties. The dynamical tracers used (radius-σ and luminosity-σ diagrams) indicate that most of the complexes might be self-gravitating entities. The resistance to forces from the parent galaxy is studied by considering the tidal mass of the candidate and its relative velocity with respect to the parent galaxy. After combining the results of previous studies of TDG searches in ULIRGs a total of 9 complexes satisfy most of the applied criteria and thus show a high-medium or high likelihood of survival, their total mass likely being compatible with that of dwarf galaxies. They are defined as TDG candidates. We propose that they probably formed more often during the early phases of the interaction. Combining all data for complexes with IFS data where a significant fraction of the system is covered, we infer a TDG production rate of 0.3 candidates with the highest probabilities of survival per system for the (U)LIRGs class. This rate, though, might decrease to 0.1 after the systems in (U)LIRGs have evolved for 10Gyr, for long-lived TDGs, which would imply that no more than 5-10% of the overall dwarf population could be of tidal origin.

Abstract Copyright:

Journal keyword(s): galaxies: interactions - galaxies: dwarf - galaxies: formation - galaxies: evolution - methods: observational

CDS comments: Paragraph 4.3.4 Calibrators R23 and S23 not identified.

Simbad objects: 27

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Number of rows : 27

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10561 1
2 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 506 1
3 NGC 1614 AGN 04 34 00.027 -08 34 44.57   14.66 13.99     ~ 591 0
4 IRAS 06076-2139 EmG 06 09 45.7859423135 -21 40 23.516504022   15.64   14.46   ~ 58 0
5 2MASX J07032428-6015221 Sy2 07 03 24.2520923348 -60 15 22.465765682   16.02   14.72   ~ 48 1
6 2MASX J08370182-4954302 G 08 37 01.827 -49 54 30.27           ~ 47 0
7 NAME IRAS F08572+3915 NW LIN 09 00 25.364 +39 03 54.23     16.66     ~ 359 1
8 NGC 2782 Sy2 09 14 05.120 +40 06 49.68 12.29 12.30 11.63     ~ 427 3
9 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 763 3
10 IC 2545 IG 10 06 04.581 -33 53 05.55   15.27 14.27 14.25   ~ 92 0
11 NGC 3561 LIN 11 11 13.2 +28 41 47   14.7       ~ 184 2
12 NGC 4016 IG 11 58 29.017 +27 31 43.60   14.6       ~ 66 0
13 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1531 0
14 LEDA 39024 LIN 12 13 46.107 +02 48 41.50           ~ 308 1
15 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 3885 3
16 NGC 5291 AGN 13 47 24.459 -30 24 25.03   15.18 14.00 13.57 12.7 ~ 138 1
17 2MASX J14373831-1500239 Sy1 14 37 38.317 -15 00 23.97   16.58 16.40     ~ 243 1
18 2MASX J15265942+3558372 LIN 15 26 59.425 +35 58 37.23   15.61       ~ 242 1
19 2MASX J16023279+3734532 LIN 16 02 32.798 +37 34 53.28           ~ 17 0
20 [WTK99] CG J1720-678 GrG 17 20 -67.8           ~ 19 0
21 IC 4687 AGN 18 13 39.829 -57 43 31.25   14.35 14.3 12.78   ~ 113 1
22 NAME Superantennae Sy2 19 31 21.4252803168 -72 39 21.448768732   17.39 16.37 14.65   ~ 273 2
23 NGC 7252 IG 22 20 44.7751096408 -24 40 41.905677809 12.26 12.46 12.06 11.57   ~ 653 1
24 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 373 1
25 NAME South America H2G 22 51 49.307 -17 52 23.96   16.97       ~ 281 3
26 ESO 148-2 Sy2 23 15 46.772 -59 03 15.94   14.94 14.73 13.95   ~ 230 1
27 NAME Local Group GrG ~ ~           ~ 6658 0

    Equat.    Gal    SGal    Ecl

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2019.10.17-01:01:36

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