2007ApJ...661..768H


Query : 2007ApJ...661..768H

2007ApJ...661..768H - Astrophys. J., 661, 768-778 (2007/June-1)

Near-infrared observations of globular clusters in NGC 4472, NGC 4594, NGC 3585, and NGC 5813 and implications for their ages and metallicities.

HEMPEL M., ZEPF S., KUNDU A., GEISLER D. and MACCARONE T.J.

Abstract (from CDS):

We present near-infrared photometry of the globular cluster systems of the early-type galaxies NGC 4472, NGC 4594, NGC 3585, and NGC 5813. We combine these near-infrared data, obtained with PANIC at the Magellan Baade 6.5 m telescope, with archival optical HST and FORS/VLT data, and use the optical to near-infrared colors to constrain the ages and metallicities of the globular clusters around the target galaxies. For NGC 4472 we have the most extensive near-infrared and optical photometric data set. These colors show that the NGC 4472 globular cluster system has a broad metallicity distribution and that the clusters are predominantly old (i.e., ages of about 10 Gyr or more). This result agrees well with earlier spectroscopic work on NGC 4472, and is evidence that the combination of optical to near-infrared colors can identify predominantly old systems and distinguish these from systems with a substantial intermediate-age component. Based on the smaller sample of combined optical and near-infrared data, NGC 4594 and NGC 3585 appear to have predominantly old globular cluster systems, while that of NGC 5813 may have a more significant age spread. We also match our sample of globular clusters with near-infrared and optical photometry to Chandra X-ray source detections in these galaxies, and discuss how the probability that a globular cluster hosts a low-mass X-ray binary depends on metallicity and age.

Abstract Copyright:

Journal keyword(s): Galaxies: Elliptical and Lenticular, cD - Galaxies: Formation - galaxies: individual (NGC 3585) - Galaxies: Individual: NGC Number: NGC 4472 - Galaxies: Individual: NGC Number: NGC 4594 - galaxies: individual (NGC 5813) - Galaxy: Globular Clusters: General

Nomenclature: Table 4: [HZK2007] NGC 4472 NN (Nos 1-37), Table 5: [HZK2007] NGC4594 NN (Nos 1-26), Table 6 [HZK2007] NGC3585 NN (Nos 1-26), Table 7: [HZK2007] NGC5813 NN (Nos 1-22).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 13

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Number of rows : 13
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 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1572 1
3 NGC 3115 GiG 10 05 13.9270507008 -07 43 06.982712292   11   9.37   ~ 1015 2
4 NGC 3585 GiG 11 13 17.109 -26 45 17.96   10.64   9.22   ~ 291 0
5 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 844 0
6 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6660 0
7 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2097 2
8 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7221 3
9 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1399 3
10 IC 4051 EmG 13 00 54.4630403184 +28 00 27.502143300 15.04 14.8 13.50 13.003 12.305 ~ 213 0
11 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3433 0
12 NGC 5813 LIN 15 01 11.2302420864 +01 42 07.141569696 12.00 11.45 10.46 10.06   ~ 638 1
13 NAME VIR-LIB CL Cld ~ ~           ~ 12 0

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