2017A&A...605A..54K


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.10CET20:12:59

2017A&A...605A..54K - Astronomy and Astrophysics, volume 605A, 54-54 (2017/9-1)

HI properties and star formation history of a fly-by pair of blue compact dwarf galaxies.

KIM J., CHUNG A., IVY WONG O., LEE B., SUNG E.-C. and STAVELEY-SMITH L.

Abstract (from CDS):

A fly-by interaction has been suggested to be one of the major explanations for enhanced star formation in blue compact dwarf (BCD) galaxies, yet no direct evidence for this scenario has been found to date. In the HI Parkes all-sky survey (HIPASS), ESO 435-IG 020 and ESO 435-G 016, a BCD pair were found in a common, extended gas envelope of atomic hydrogen, providing an ideal case to test the hypothesis that the starburst in BCDs can be indeed triggered by a fly-by interaction. Using high-resolution data from the Australia Telescope Compact Array (ATCA), we investigated HI properties and the spectral energy distribution (SED) of the BCD pair to study their interaction and star formation histories. The high-resolution HI data of both BCDs reveal a number of peculiarities, which are suggestive of tidal perturbation. Meanwhile, 40% of the HIPASS flux is not accounted for in the ATCA observations with no HI gas bridge found between the two BCDs. Intriguingly, in the residual of the HIPASS and the ATCA data, ∼10% of the missing flux appears to be located between the two BCDs. While the SED-based age of the most dominant young stellar population is old enough to have originated from the interaction with any neighbors (including the other of the two BCDs), the most recent star formation activity traced by strong Hα emission in ESO 435-IG 020 and the shear motion of gas in ESO 435-G 016, suggest a more recent or current tidal interaction. Based on these and the residual emission between the HIPASS and the ATCA data, we propose an interaction between the two BCDs as the origin of their recently enhanced star formation activity. The shear motion on the gas disk, potentially with re-accretion of the stripped gas, could be responsible for the active star formation in this BCD pair.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: individual: ESO 435-020 - galaxies: individual: ESO 435-016 - galaxies: interactions - galaxies: ISM - galaxies: kinematics and dynamics - galaxies: starburst - galaxies: starburst

VizieR on-line data: <Available at CDS (J/A+A/605/A54): list.dat datacube.fits>

Simbad objects: 16

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Number of rows : 16

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 J08380769+6508579 G 08 38 07.694 +65 08 57.92           ~ 6 1
2 2MASX J08382309+6507160 SBG 08 38 23.093 +65 07 16.05     14.16     ~ 115 1
3 NGC 3056 GiG 09 54 32.8546621996 -28 17 53.618094371   12.61   11.00 12.0 ~ 66 0
4 ESO 435-16 EmG 09 58 46.223 -28 37 18.86   13.43   12.25 13.0 ~ 38 2
5 ESO 435-20 H2G 09 59 21.226 -28 08 00.04   14.42 14.08 13.33   ~ 77 2
6 NGC 3113 LSB 10 04 26.118 -28 26 38.46   13.35   12.15 12.7 ~ 37 0
7 NAME NGC 3175 Group GrG 10 10 13.3 -28 49 48           ~ 10 0
8 QSO B1015-314 QSO 10 18 09.2600495231 -31 44 13.997657610   21 20.4     ~ 62 1
9 LEDA 37102 Sy1 11 51 33.3534243441 -02 22 21.893770899   17       ~ 141 0
10 Mrk 1307 Sy1 11 52 37.19 -02 28 09.9   14.79   14.09 14.9 ~ 155 0
11 ESO 338-4B G 19 27 31.677 -41 38 53.40   15.66 15.0 15.04   ~ 8 1
12 ESO 338-4 IG 19 27 58.338 -41 34 30.81   13.55 13.21 13.14 13.43 ~ 204 1
13 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 923 1
14 ESO 400-43 bCG 20 37 41.931 -35 29 07.94   14.26 14.34 13.93 13.96 ~ 46 2
15 ESO 400-43B G 20 37 51.255 -35 29 43.16   16.25 15.7 15.51   ~ 8 0
16 NAME Local Group GrG ~ ~           ~ 6698 0

    Equat.    Gal    SGal    Ecl

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2019.12.10-20:12:59

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