2022A&A...659A..92L


Query : 2022A&A...659A..92L

2022A&A...659A..92L - Astronomy and Astrophysics, volume 659A, 92-92 (2022/3-1)

Galaxy populations in the Hydra I cluster from the VEGAS survey. I. Optical properties of a large sample of dwarf galaxies.

LA MARCA A., PELETIER R., IODICE E., PAOLILLO M., CHOQUE CHALLAPA N., VENHOLA A., FORBES D.A., CANTIELLO M., HILKER M., REJKUBA M., ARNABOLDI M., SPAVONE M., D'AGO G., RAJ M.A., RAGUSA R., MIRABILE M., RAMPAZZO R., SPINIELLO C., MIESKE S. and SCHIPANI P.

Abstract (from CDS):

Context. Due to their relatively low stellar mass content and diffuse nature, the evolution of dwarf galaxies can be strongly affected by their environment. Analyzing the properties of the dwarf galaxies over a wide range of luminosities, sizes, morphological types, and environments, we can obtain insights about their evolution. At ∼50 Mpc, the Hydra I cluster of galaxies is among the closest cluster in the z ≃ 0 Universe, and an ideal environment to study dwarf galaxy properties in a cluster environment. Aims. We exploit deep imaging data of the Hydra I cluster to construct a new photometric catalog of dwarf galaxies in the cluster core, which is then used to derive properties of the Hydra I cluster dwarf galaxy population as well as to compare it with other clusters. Moreover, we investigate the dependency of dwarf galaxy properties on their surrounding environment. Methods. The new wide-field g- and r-band images of the Hydra I cluster obtained with the OmegaCAM camera on the VLT Survey Telescope (VST) in the context of the VST Early-type GAlaxy Survey (VEGAS) were used to study the dwarf galaxy population in the Hydra I cluster core down to r-band magnitude Mr = -11.5 mag. We used an automatic detection tool to identify dwarf galaxies from a ∼1 deg2 field centered on the Hydra I core, covering almost half of the cluster virial radius. The photometric pipeline was used to estimate the principal photometric parameters for all targets. Scaling relations and visual inspection were used to assess the cluster membership and construct a new dwarf galaxy catalog. Finally, based on the new catalog, we studied the structural (Sersic index n, effective radius Re, and axis ratio) and photometric (colors and surface brightness) properties of the dwarf galaxies, also investigating how they vary as a function of clustercentric distance. Results. The new Hydra I dwarf catalog contains 317 galaxies with a luminosity between -18.5 < Mr < -11.5 mag, a semi-major axis larger than ∼200 pc (a = 0.84''), of which 202 are new detections, and previously unknown dwarf galaxies in the Hydra I central region. We estimate that our detection efficiency reaches 50% at the limiting magnitude Mr = -11.5 mag, and at the mean effective surface brightness µe,r=26.5mag/arcsec2. We present the standard scaling relations for dwarf galaxies, which are color-magnitude, size-luminosity, and Sersic n-magnitude relations, and compare them with other nearby clusters. We find that there are no observational differences for dwarfs scaling relations in clusters of different sizes. We study the spatial distribution of galaxies, finding evidence for the presence of substructures within half the virial radius. We also find that mid- and high-luminosity dwarfs (Mr < -14.5 mag) become, on average, redder toward the cluster center, and that they have a mild increase in Re with increasing clustercentric distance, similar to what is observed for the Fornax cluster. No clear clustercentric trends are reported for surface brightness and Sersic index. Considering galaxies in the same magnitude bins, we find that for high and mid-luminosity dwarfs (Mr < -13.5 mag), the g - r color is redder for the brighter surface brightness and higher Sersic n index objects. This finding is consistent with the effects of harassment and/or partial gas stripping.

Abstract Copyright: © ESO 2022

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: clusters: individual: Hydra I (Abell 1060) - galaxies: photometry

VizieR on-line data: <Available at CDS (J/A+A/659/A92): hcdc.dat>

Simbad objects: 17

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Number of rows : 17
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 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 844 0
2 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1518 1
3 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1706 0
4 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 671 2
5 ACO 754 ClG 09 08 50.1 -09 38 12           ~ 647 1
6 2MASX J10362764-2719092 GiG 10 36 27.6597454536 -27 19 09.163367256   15.6 13.78   12.53 ~ 40 0
7 NGC 3309 GiG 10 36 35.6607096792 -27 31 05.732321664   11.98 11.78 10.34 10.51 ~ 154 0
8 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 808 1
9 HCC 87 G 10 36 39.0 -27 21 25     21.75   20.68 ~ 14 0
10 NGC 3311 BiC 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 286 2
11 NGC 3312 LIN 10 37 02.5165552728 -27 33 53.924090760   12.63 13.96     ~ 106 0
12 LEDA 31531 GiC 10 37 12.8 -27 41 04     13.11     ~ 33 0
13 NGC 3316 GiG 10 37 37.3173763464 -27 35 38.848143372   13.66 13.03 12.20 11.77 ~ 48 0
14 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6316 0
15 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6734 3
16 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4548 2
17 NAME Local Group GrG ~ ~           ~ 7764 0

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2022.09.25-02:49:17

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