2022A&A...666A..99H


Query : 2022A&A...666A..99H

2022A&A...666A..99H - Astronomy and Astrophysics, volume 666A, 99 (2022/10-1)

A study of globular clusters in a lenticular galaxy in Hydra I from deep HST/ACS photometry.

HAZRA N., CANTIELLO M., RAIMONDO G., MIRABILE M., BLAKESLEE J.P., BRANCHESI M. and BROCATO E.

Abstract (from CDS):


Aims. We take advantage of exquisitely deep optical imaging data from the Hubble Space Telescope's Advanced Camera for Surveys (HST/ACS) in the F475W (gF475W) and F606W (VF606W) bands to study the properties of the globular cluster (GC) population in the intermediate-mass lenticular galaxy PGC 087327in the Hydra I galaxy cluster.
Methods. We inspected the photometric (magnitudes and colour) and morphometric (compactness, elongation, etc.) properties of sources lying in an area of ∼19 × 19 kpc centred on PGC 087327 and compared them with four neighbouring fields over the same HST/ACS mosaic. This allowed us to identify a list of GC candidates and to inspect their properties using a background decontamination method.
Results. Relative to four comparison fields, PGC 087327 shows a robust overdensity of GCs, NGC = 82 ± 9. At the estimated magnitude of the galaxy, this number implies a specific frequency of SN = 1.8 ± 0.7. In spite of the short wavelength interval available with the gF475W and VF606W passbands, the colour distribution shows a clear bimodality with a blue peak at ⟨gF475W - VF606W⟩ = 0.47 ± 0.05 mag and a red peak at ⟨gF475W - VF606W⟩ = 0.62 ± 0.03 mag. We also observe the typical steeper slope of the radial distribution of red GCs relative to blue ones. Thanks to the unique depth of the available data, we characterise the GC luminosity function (GCLF) well beyond the expected GCLF turnover. We find gTOMF475W = 26.54 ± 0.10 mag and VTOMF606W = 26.08 ± 0.09 mag, which after calibration yields a distance of DGCLF = 56.7 ± 4.3(statistical) ± 5.2(systematic) Mpc.

Abstract Copyright: © N. Hazra et al. 2022

Journal keyword(s): galaxies: distances and redshifts - galaxies: elliptical and lenticular, cD - galaxies: star clusters: general - galaxies: individual: PGC 087327

VizieR on-line data: <Available at CDS (J/A+A/666/A99): tablea2.dat>

Status at CDS : Examining the need for a new acronym. // All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NGC 1316 BL? 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1394 1
2 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 841 1
3 NGC 3311 EmG 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 300 2
4 2MASX J10370969-2739281 GiC 10 37 09.6552258144 -27 39 28.078215084   15.97   15.37   ~ 22 0
5 LEDA 31532 GiC 10 37 12.7 -27 41 03   13.3       ~ 24 0
6 LEDA 31531 GiC 10 37 12.85 -27 41 02.2     13.11     ~ 38 0
7 NGC 3610 GiG 11 18 25.2827189856 +58 47 10.433735988   11.4       ~ 311 0
8 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6660 0
9 NGC 4434 GiG 12 27 36.6771662112 +08 09 15.640206876   13.2       ~ 258 0

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