2010A&A...520A..90C


Query : 2010A&A...520A..90C

2010A&A...520A..90C - Astronomy and Astrophysics, volume 520, A90-90 (2010/9-2)

Mapping the properties of blue compact dwarf galaxies: integral field spectroscopy with PMAS.

CAIROS L.M., CAON N., ZURITA C., KEHRIG C., ROTH M. and WEILBACHER P.

Abstract (from CDS):

Blue compact dwarf (BCD) galaxies are low-luminosity, low-metal content dwarf systems undergoing violent bursts of star formation. They present a unique opportunity to probe galaxy formation and evolution and to investigate the process of star formation in a relatively simple scenario. Spectrophotometric studies of BCDs are essential to disentangle and characterize their stellar populations. We perform integral field spectroscopy of a sample of BCDs with the aim of analyzing their morphology, the spatial distribution of some of their physical properties (excitation, extinction, and electron density) and their relationship with the distribution and evolutionary state of the stellar populations. Integral field spectroscopy observations of the sample galaxies were carried out with the Potsdam Multi-Aperture Spectrophotometer (PMAS) at the 3.5m telescope at Calar Alto Observatory. An area 16''x16'' in size was mapped with a spatial sampling of 1''x1''. We obtained data in the 3590-6996Å spectral range, with a linear dispersion of 3.2Å per pixel. From these data we built two-dimensional maps of the flux of the most prominent emission lines, of two continuum bands, of the most relevant line ratios, and of the gas velocity field. Integrated spectra of the most prominent star-forming regions and of whole objects within the FOV were used to derive their physical parameters and the gas metal abundances. Six galaxies display the same morphology both in emission line and in continuum maps; only in two objects, Mrk 32 and Tololo 1434+032, the distributions of the ionized gas and of the stars differ considerably. In general the different excitation maps for a same object display the same pattern and trace the star-forming regions, as expected for objects ionized by hot stars; only the outer regions of Mrk 32, I Zw 123 and I Zw 159 display higher [SII]/Hα values, suggestive of shocks. Six galaxies display an inhomogeneous dust distribution. Regarding the kinematics, Mrk 750, Mrk 206 and I Zw 159 display a clear rotation pattern, while in Mrk 32, Mrk 475 and I Zw 123 the velocity fields are flat.

Abstract Copyright:

Journal keyword(s): galaxies: starburst - galaxies: dwarf - galaxies: stellar content - galaxies: abundances

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 - 2022
#notes
1 BD+75 325 HS* 08 10 49.4903003712 +74 57 57.931973676 8.002 9.23 9.50 9.698 9.884 sdO5 241 0
2 Mrk 1418 G 09 40 27.0097822368 +48 20 15.466478856   13.5       ~ 66 0
3 Mrk 407 G 09 47 47.6336764824 +39 05 02.934294540   15.1       ~ 27 0
4 NGC 3011 Sy2 09 49 41.2024297320 +32 13 15.992090904   14.2       ~ 86 0
5 Mrk 32 G 10 27 01.7018076288 +56 16 14.337853680   16.5       ~ 34 0
6 NAME Great Attractor SCG 10 32 -46.0           ~ 516 0
7 Mrk 750 H2G 11 50 02.7462827640 +15 01 23.396910168   15.4       ~ 73 0
8 Mrk 206 G 12 24 17.0632441937 +67 26 23.823728397   15.5       ~ 36 0
9 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6250 0
10 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 551 0
11 LEDA 52256 EmG 14 37 08.9086289184 +03 02 49.631345340           ~ 16 0
12 Mrk 475 EmG 14 39 05.4743306976 +36 48 21.838203540   17.0       ~ 101 0
13 Mrk 487 bCG 15 37 04.237 +55 15 47.60   15.2       ~ 129 0
14 BD+33 2642 pA* 15 51 59.8854348048 +32 56 54.329485272 9.806 10.61 10.73 10.884 10.961 O7p 398 0
15 Mrk 1499 bCG 16 35 20.996 +52 12 52.20   15.6       ~ 57 0

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2022.05.28-17:17:15

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