J/MNRAS/367/156 C-T1 photometry in NGC 1374, 1379 and 1387 (Bassino+, 2006)
Globular cluster systems in low-luminosity early-type galaxies near the
Fornax cluster centre.
Bassino L.P., Richtler T., Dirsch B.
<Mon. Not. R. Astron. Soc., 367, 156-168 (2006)>
=2006MNRAS.367..156B 2006MNRAS.367..156B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Clusters, globular ; Photometry, CMT1T2V
Keywords: galaxies: clusters: general -
galaxies: elliptical and lenticular, cD - galaxies: haloes -
galaxies: individual: NGC 1374, NGC 1379, NGC 1387 -
galaxies: photometry - galaxies: star clusters
Abstract:
We present a photometric study of the globular cluster systems (GCSs)
of the Fornax cluster galaxies NGC 1374, NGC 1379 and NGC 1387. The
data consist of images from the wide-field MOSAIC imager of the Cerro
Tololo Inter-American Observatory (CTIO) 4-m telescope, obtained with
Washington C and Kron-Cousins R filters. The images cover a field of
36x36arcmin2, corresponding to 200x200kpc2 at the Fornax distance.
Two of the galaxies, NGC 1374 and NGC 1379, are low-luminosity
ellipticals while NGC 1387 is a low-luminosity lenticular. Their
cluster systems are still embedded in the cluster system of NGC 1399.
Therefore, the use of a large field is crucial and some differences to
previous work can be explained by this. The colour distributions of
all GCSs are bimodal. NGC 1387 presents a particularly distinct
separation between red and blue clusters and an over-proportionally
large population of red clusters. The radial distribution is different
for blue and red clusters, red clusters being more concentrated
towards the respective galaxies. The different colour and radial
distributions point to the existence of two globular cluster
subpopulations in these galaxies. Specific frequencies are in the
range SN=1.4-2.4, smaller than the typical values for elliptical
galaxies. These galaxies might have suffered tidal stripping of blue
globular clusters by NGC 1399.
Description:
The observations were performed with the MOSAIC camera (8 CCDs MOSAIC
imager) mounted at the prime focus of the 4-m Blanco telescope at the
Cerro Tololo Inter-American Observatory (CTIO), during 2001 November
17-19.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 44 2963 Catalog of globular cluster candidates
identified on the MOSAIC field.
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See also:
J/A+A/433/43 : C-T1 phot. of NGC 4636 globular cluster system (Dirsch+, 2005)
J/AJ/127/2114 : Globular clusters around NGC 1399 (Dirsch+, 2004)
J/A+AS/109/1 : CCD photometry of globular clusters (Richtler, 1995)
J/A+AS/134/59 : The central Fornax Cluster. I. Galaxy photometry (Hilker+ 1999)
J/A+AS/134/75 : Central Fornax Cluster. II. Galaxy spectroscopy (Hilker+ 1999)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000) (1)
4- 5 I2 min RAm Right ascension (J2000) (1)
7- 11 F5.2 s RAs Right ascension (J2000) (1)
13 A1 --- DE- Declination sign (J2000) (1)
14- 15 I2 deg DEd Declination (J2000) (1)
17- 18 I2 arcmin DEm Declination (J2000) (1)
20- 23 F4.1 arcsec DEs Declination (J2000) (1)
25- 29 F5.2 mag T1mag T1 magnitude
31- 34 F4.2 mag e_T1mag rms uncertainty on T1
36- 39 F4.2 mag C-T1 C-T1 colour index
41- 44 F4.2 mag e_C-T1 rms uncertainty on C-T1
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Note (1): Globular clusters systems identified in Simbad as
[BRD2006] JHHMMSS.ss+DDMMSS.s
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Sep-2006