2017A&A...600A.125C


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.28CET06:30:32

2017A&A...600A.125C - Astronomy and Astrophysics, volume 600A, 125-125 (2017/4-1)

Integral field observations of the blue compact galaxy Haro 14. Star formation and feedback in dwarf galaxies.

CAIROS L.M. and GONZALEZ-PEREZ J.N.

Abstract (from CDS):

Context. Low-luminosity, gas-rich blue compact galaxies (BCG) are ideal laboratories to investigate the triggering and propagation of star formation in galaxies, the effects of massive stellar feedback within a shallow gravitational potential, and the enrichment of the interstellar medium.
Aims. We aim to probe the morphology, stellar content, and kinematics, along with the nebular excitation and ionization mechanism, in the BCG Haro 14 by means of integral field observations.
Methods. We observed Haro 14 at the Very Large Telescope, working with the Visible Multi-Object Spectrograph. From these data we build maps in continuum and in the brighter emission lines, produce line-ratio maps (interstellar extinction, density, and diagnostic-line ratios), and obtain the velocity and velocity dispersion fields. We also generate the integrated spectrum of the major HII regions and young stellar clusters identified in the maps to determine reliable physical parameters and oxygen abundances.
Results. We find as follows: i) the current star formation in Haro 14 is spatially extended with the major HII regions placed along a linear (chain-like) structure, elongated in the north-south direction, and in a horseshoe-like curvilinear feature that extends about 760pc eastward; the continuum emission is more concentrated and peaks close to the galaxy center; ii) two different episodes of star formation are present in the central galaxy regions: the recent starburst, with ages≤6Myr and the intermediate-age clusters, with ages between 10 and 30Myr; these stellar components rest on a several Gyr old underlying host galaxy; iii) the Hα/Hβ pattern is inhomogeneous, with excess color values varying from E(B-V)=0.04 up to E(B-V)=1.09; iv) shocks play a significant role in the galaxy; and v) the velocity field displays a complicated pattern with regions of material moving toward us in the east and north galaxy areas.
Conclusions. The morphology of Haro 14, its irregular velocity field, and the presence of shocks speak in favor of a scenario of triggered star formation. Ages of the knots, i.e., 6Myr for the starburst and 10-30Myr for the central clusters, are consistent with the ongoing burst being triggered by the collective action of stellar winds and supernovae originated in the central clusters.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: abundances - galaxies: individual: Haro 14 - galaxies: dwarf - galaxies: ISM - galaxies: star formation - galaxies: stellar content - galaxies: stellar content

Simbad objects: 6

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Number of rows : 6

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 NGC 244 bCG 00 45 46.4181876205 -15 35 48.385823743   14.1   13.04 13.4 ~ 76 0
2 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1751 1
3 NAME Great Attractor SCG 10 32 -46.0           ~ 472 0
4 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5909 0
5 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 511 0
6 CD-38 10980 WD* 16 23 33.8384178546 -39 13 46.160032569 9.916 10.885 11.029 10.936 10.841 DA2 440 0

    Equat.    Gal    SGal    Ecl

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2020.10.28-06:30:32

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