2011A&A...533A..65V


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.20CEST04:14:36

2011A&A...533A..65V - Astronomy and Astrophysics, volume 533A, 65-65 (2011/9-1)

Searching for star-forming galaxies in the Fornax and Hydra clusters.

VADUVESCU O., KEHRIG C., VILCHEZ J.M. and UNDA-SANZANA E.

Abstract (from CDS):

The formation and evolution of dwarf galaxies is relatively difficult to understand because of their faint emission in all regimes that require large aperture telescopes. We intend to study the evolution of star-forming dwarf galaxies in clusters. We selected Fornax and Hydra clusters to complement our previous study of Virgo. On the basis of available literature data, we selected ten star-forming candidates in Fornax and another ten objects in Hydra. We used Gemini South with GMOS to acquire Hα images necessary to detect star-forming regions in the two galaxy samples. We then performed long-slit spectroscopy for the brightest six candidates, to derive their chemical properties. Finally, we employed the VLT with HAWK-I to observe all galaxies in the K' band to derive their main physical properties. We studied the morphology of our two samples, finding five objects in Fornax and six in Hydra with structures consistent with those of star-forming dwarfs, i.e., dwarf irregulars (dIs) or blue compact dwarfs (BCDs). About four other objects are probably dwarf spirals, while three objects remained undetected in both visible and near infrared. On the basis of visible bright emission lines, we derived oxygen abundances for ten star-forming candidates with values between 8.00≤12+log(O/H)≤8.78. Most fundamental properties of star-forming galaxies in Fornax and Hydra appear similar to corresponding properties of dIs and BCDs from Virgo and the local volume (LV). The luminosity-metallicity and metallicity-gas fraction relations in the LV and Virgo appear to be followed by Fornax and Hydra samples, suggesting that the chemical evolution of the two clusters seems consistent with the predictions from the closed box model, although larger samples are needed to investigate the role of possible environmental effects. Star-forming dwarfs (dIs and BCDs) in different environments appear to follow different mass-metallicity relations, with more metal-rich objects tending to occupy regions of higher galaxy overdensity in the Virgo and Hydra clusters. Treated separatelly, dIs and BCDs also appear to define different mass-metallicity relations, with BCDs following a steeper relation than dIs fitted alone. Only two objects from Fornax and Hydra appear confined to the dwarf fundamental plane (FP) which does not seem to hold for most Hydra objects, suggesting that the environment has some influence. A concerted effort is necessary to acquire deep radio data for these nearby clusters in conjunction with NIR imaging and spectroscopy.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: clusters: general - galaxies: fundamental parameters - galaxies: evolution - infrared: galaxies - galaxies abundances

CDS comments: Paragraph 2.2 LTT 7378 not in Simbad (probable misprint).

Simbad objects: 35

goto Full paper

goto View the reference in ADS

Number of rows : 35

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 CD-28 595 PM* 01 54 50.2704861570 -27 28 35.740415025   12.06 11.51     ~ 115 0
2 L 514-12 PM* 02 52 18.2079873924 -34 11 50.195718164   15.8       ~ 9 0
3 6dFGS gJ032452.5-352608 GiC 03 24 52.426 -35 26 07.65   15.36       ~ 13 0
4 ESO 357-27 GiP 03 24 58.4408048999 -37 00 34.546731146   14.36   13.23   ~ 41 0
5 6dFGS gJ032504.2-365540 GiP 03 25 04.19 -36 55 38.7   15.49       ~ 19 0
6 LEDA 74676 GiC 03 31 39.0 -36 16 39   19.2       ~ 8 0
7 6dFGS gJ033210.7-361314 LSB 03 32 10.74 -36 13 14.9   16.39       ~ 14 0
8 LEDA 13185 GiC 03 33 34.22 -36 36 21.3   16.43       ~ 11 0
9 LEDA 659931 G 03 33 57.3 -34 36 44           ~ 6 0
10 LEDA 74732 GiC 03 34 07.0 -36 27 58   16.8       ~ 6 0
11 [VV2006] J033407.5-360404 Sy1 03 34 07.74 -36 04 10.7   19.7 20.10     ~ 12 0
12 FLSBG 223 LSB 03 34 09.180 -35 30 59.50   18.2       ~ 10 0
13 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1416 1
14 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1490 0
15 LP 995-86 PM* 03 48 22.6125635562 -39 08 37.013516494   13.61 13.15     F 86 0
16 CD-32 5613 WD* 08 41 32.4293043356 -32 56 32.916852010   12.07 11.85 12.3   DA5.5 257 0
17 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 149 0
18 6dFGS gJ103416.6-283406 GiC 10 34 16.560 -28 34 05.75   15.87   14.87   ~ 13 0
19 LEDA 763823 GiC 10 34 20.6 -26 47 30           ~ 7 0
20 LEDA 762376 GiC 10 34 40.6 -26 54 32           ~ 5 0
21 LEDA 755655 GiC 10 35 21.7 -27 23 26           ~ 5 0
22 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 763 1
23 NGC 3311 BiC 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 263 2
24 6dFGS gJ103719.9-281420 GiC 10 37 19.900 -28 14 20.17   16.0       ~ 12 0
25 LEDA 744507 GiC 10 37 38.7 -28 12 26           ~ 5 0
26 6dFGS gJ103741.0-262056 GiC 10 37 40.983 -26 20 55.47   16.2       ~ 11 0
27 LEDA 2793456 G 10 37 51.3 -25 18 07           ~ 4 0
28 LEDA 747838 GiC 10 38 11.9 -27 56 15           ~ 5 0
29 [DPB99] H1038-2733 G 10 40 26.4 -27 48 53           ~ 3 0
30 LEDA 750199 GiC 10 40 58.6 -27 45 47           ~ 5 0
31 LAWD 37 WD* 11 45 42.9170659451 -64 50 29.464090822 11.08 11.725 11.513 11.34 11.163 DQ 224 0
32 2MASX J12103572+1145386 GiG 12 10 35.7595267945 +11 45 38.931730462   14.9       ~ 55 0
33 MCG+01-31-030 GiP 12 15 18.322 +05 45 40.28   14.9       ~ 72 0
34 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5645 0
35 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 546 3

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2011A&A...533A..65V and select 'bookmark this link' or equivalent in the popup menu


2019.10.20-04:14:36

© Université de Strasbourg/CNRS

    • Contact