2016ApJ...817...58H


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.29CET22:43:11

2016ApJ...817...58H - Astrophys. J., 817, 58 (2016/January-3)

Globular cluster systems in brightest cluster galaxies. II. NGC 6166.

HARRIS W.E., BLAKESLEE J.P., WHITMORE B.C., GNEDIN O.Y., GEISLER D. and ROTHBERG B.

Abstract (from CDS):

We present new deep photometry of the globular cluster system (GCS) around NGC 6166, the central supergiant galaxy in Abell 2199. Hubble Space Telescope data from the Advanced Camera for Surveys and WFC3 cameras in F475W and F814W are used to determine the spatial distribution of the GCS, its metallicity distribution function (MDF), and the dependence of the MDF on galactocentric radius and on GC luminosity. The MDF is extremely broad, with the classic red and blue subpopulations heavily overlapped, but a double-Gaussian model can still formally match the MDF closely. The spatial distribution follows a Sérsic-like profile detectably to a projected radius of at least Rgc= 250 kpc. To that radius, the total number of clusters in the system is NGC= 39000±2000, the global specific frequency is SN= 11.2±0.6, and 57% of the total are blue, metal-poor clusters. The GCS may fade smoothly into the intracluster medium (ICM) of A2199; we see no clear transition from the core of the galaxy to the cD halo or the ICM. The radial distribution, projected ellipticity, and mean metallicity of the red (metal-richer) clusters match the halo light extremely well for Rgc ≳ 15 kpc, both of them varying as σMRGC ∼ σlight ∼ R–1.8. By comparison, the blue (metal-poor) GC component has a much shallower falloff σMRGC ∼ R–1.0 and a more nearly spherical distribution. This strong difference in their density distributions produces a net metallicity gradient in the GCS as a whole that is primarily generated by the population gradient. With NGC 6166 we appear to be penetrating into a regime of high enough galaxy mass and rich enough environment that the bimodal two-phase description of GC formation is no longer as clear or effective as it has been in smaller galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: formation - galaxies: halos - galaxies: star clusters: general - globular clusters: general

Simbad objects: 33

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Number of rows : 33

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 NAME Eridanus ClG GrG 00 30 00 -21 30.0           ~ 142 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10684 1
3 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1244 0
4 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1429 1
5 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1504 0
6 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 515 1
7 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 151 0
8 NGC 3258 BiC 10 28 53.588 -35 36 19.98   12.50 11.72 10.86   ~ 166 0
9 ACO S 636 ClG 10 29 41.0957 -35 19 32.908           ~ 194 0
10 NGC 3268 BiC 10 30 00.655 -35 19 31.83   12.57 11.77 10.68   ~ 138 0
11 NGC 3311 BiC 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 264 2
12 NGC 3348 GiG 10 47 09.994 +72 50 22.83   12.0       ~ 103 0
13 [FWB89] GrG 221 GrG 10 54.1 +72 36   11.7       ~ 12 0
14 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5706 0
15 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1934 2
16 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6086 3
17 NGC 4696 BiC 12 48 49.277 -41 18 39.92   11.21   10.7   ~ 448 3
18 NAME Cen 30 ClG 12 48 51.7 -41 18 21           ~ 57 0
19 NGC 4874 LIN 12 59 35.709 +27 57 33.80 13.01 13.7 11.40 12.122 11.386 ~ 701 3
20 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4136 2
21 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1007 0
22 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2942 0
23 MCG+07-34-050 GiC 16 28 31.0730072105 +39 31 15.999423824   16       ~ 35 1
24 MCG+07-34-055 GiC 16 28 36.0612387908 +39 32 01.485044496   14.81       ~ 26 0
25 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1088 1
26 3C 338.0 QSO 16 28 38.2443686587 +39 33 04.231770853   12.78 11.78     ~ 692 5
27 MCG+07-34-067 GiG 16 28 45.0753511481 +39 26 13.543254006   15.4       ~ 28 0
28 SDSS J162845.07+392629.5 G 16 28 45.078 +39 26 29.59           ~ 1 0
29 MCG+07-34-069 GiG 16 28 46.1887024166 +39 27 47.315344365   15.4       ~ 24 0
30 NGC 7626 rG 23 20 42.524 +08 13 01.43   12.8       ~ 399 1
31 NAME Peg I ClG 23 21 +08.3           ~ 69 0
32 NGC 6166D G ~ ~   18       ~ 7 1
33 NAME Local Group GrG ~ ~           ~ 6776 0

    Equat.    Gal    SGal    Ecl

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2020.01.29-22:43:11

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