J/ApJ/682/199 Globulars with X-ray sources in NGC 5128 (Woodley+, 2008)
Globular clusters and X-ray point sources in Centaurus A (NGC 5128).
Woodley K.A., Raychaudhury S., Kraft R.P., Harris W.E., Jordan A.,
Whitaker K.E., Jones C., Forman W.R., Murray S.S.
<Astrophys. J., 682, 199-211 (2008)>
=2008ApJ...682..199W 2008ApJ...682..199W
ADC_Keywords: Clusters, globular ; Photometry ; Abundances, [Fe/H] ;
X-ray sources ; Galaxies, nearby
Keywords: galaxies: elliptical and lenticular, cD - globular clusters: general -
galaxies: individual (NGC 5128) - X-rays: binaries - X-rays: galaxies
Abstract:
We detect 353 X-ray point sources, mostly low-mass X-ray binaries
(LMXBs), in four Chandra observations of Centaurus A (NGC 5128), the
nearest giant early-type galaxy, and correlate this point-source
population with the largest available ensemble of confirmed and likely
globular clusters (GCs) associated with this galaxy. Of the X-ray
sources, 31 are coincident with 30 GCs that are confirmed members of
the galaxy by radial velocity measurement (two X-ray sources match one
GC within our search radius), while one X-ray source coincides with a
GC resolved by Hubble Space Telescope (HST) images. Another 36 X-ray
point sources match probable, but spectroscopically unconfirmed, GC
candidates.
Description:
Chandra ACIS observations of Cen A were made in faint mode, in 1999
Dec 5, 2000 May 17, 2002 Sep 3 and 2003 Sep 14 (UT).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 83 67 Globular clusters in Cen A (NGC 5128) with
X-ray sources
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See also:
J/MNRAS/386/1443 : 2dF study of globular clusters in NGC 5128 (Beasley+, 2008)
J/AJ/134/494 : NGC 5128 globular clusters UBVRICMT1 phot. + RV (Woodley+,
2007)
J/AJ/132/2187 : MCT1 photometry of NGC 5128 globular clusters (Harris+,
2006)
J/AJ/128/723 : Washington Photometry in NGC 5128. II (Harris+, 2004)
J/ApJ/600/716 : NGC 5128 Chandra X-ray point sources (Minniti+, 2004)
J/ApJS/150/367 : Globular clusters in NGC 5128 (Peng+, 2004)
J/A+A/369/812 : UVKs photometry of globular clusters in NGC 5128 (Rejkuba,
2001)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Globular cluster name (1)
12- 14 A3 --- n_Name [bcd, ] Individual notes (2)
16- 17 I2 h RAh Hour of right ascension (J2000)
19- 20 I2 min RAm Minute of right ascension (J2000)
22- 26 F5.2 s RAs Second of right ascension (J2000)
28 A1 --- DE- Declination sign (J2000)
29- 30 I2 deg DEd Degree of declination (J2000)
32- 33 I2 arcmin DEm Arcminute of declination (J2000)
35- 39 F5.2 arcsec DEs Arcsecond of declination (J2000)
40- 44 F5.2 arcmin Rad Galactocentric radius
46- 50 F5.2 mag Bmag ? B-band magnitude (3)
52- 56 F5.2 mag Vmag ? V-band magnitude (3)
58- 62 F5.2 mag Icmag ? Ic-band magnitude (3)
64- 68 F5.2 mag T1mag ? T1-band magnitude (4)
70- 75 F6.3 mag C-T1 ? C-T1 color index (4)
77- 83 F7.4 [-] [Fe/H] ? [Fe/H] metallicity (5)
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Note (1): Globular cluster names significations:
GC = GCs from Woodley et al. (2007, Cat. J/AJ/134/494). Clusters
confirmed by either radial velocity or HST imaging. (Objects are
<[WHB2007] GCNNNN> in Simbad).
BTC = candidate GCs from Harris et al. (2004, Cat. J/AJ/128/723,
objects are <[HHG2004] NNN> in Simbad)
Minniti = candidate clusters from Minniti et al. (2004, Cat. J/ApJ/600/716,
objects are <[MRF2004] NNN> in Simbad)
K- = candidate GCs (with no radial velocity measurement) from
Peng et al. (2004, Cat. J/ApJS/150/367, objects are <[KKF2001] NNN>
in Simbad).
Note (2): Flags as follows:
b = GCs with radial velocity measurement listed as an average weight of all
previous measurements in Woodley et al. (2007, Cat. J/AJ/134/494).
c = GC 0233 matched both X-ray point source 55 and 56 within 1.5", and one of
them within 0.5".
d = Minniti et al. (2004, Cat. J/ApJ/600/716) suggest that Minniti 53 is
spectroscopically confirmed from Harris et al. (1992AJ....104..613H 1992AJ....104..613H), yet
in this study, we do not find that the position of Minniti 53 matches any
previously known GC with a radial velocity measurement within a search
radius of 2". We list this object as a candidate GC.
Note (3): The BVI data are taken from Peng et al. (2004, Cat. J/ApJS/150/367)
and are not dereddened.
Note (4): The Washington photometry data are from Harris et al. (2004, Cat.
J/AJ/128/723) and are not dereddened.
Note (5): The metallicity [Fe/H] was determined from the color (C-T1)0,
using a conversion derived by Harris & Harris (2002AJ....123.3108H 2002AJ....123.3108H),
which produces an uncertainty in [Fe/H] of ±0.2dex at the metal-poor
end and ±0.07dex at the metal-rich end for a typical photometric
uncertainty of σ(C-T1)∼0.1, assuming a mean age of
τ∼13Gyr.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 04-Nov-2010