J/AJ/143/84 New candidate globular clusters in NGC 5128 (Harris+, 2012)
Eight hundred new candidates for globular clusters in NGC 5128 (Centaurus A).
Harris G.L.H., Gomez M., Harris W.E., Johnston K., Kazemzadeh F.,
Kerzendorf W., Geisler D., Woodley K.A.
<Astron. J., 143, 84 (2012)>
=2012AJ....143...84H 2012AJ....143...84H
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Positional data ;
Photometry, UBVRI
Keywords: galaxies: elliptical and lenticular, cD -
galaxies: individual (NGC 5128) - galaxies: star clusters: general -
globular clusters: general
Abstract:
We have used new wide-field imaging with the Magellan IMACS camera to
search for globular cluster (GC) candidates around NGC 5128, the
nearest giant E galaxy. The imaging data are in the B and R broadband
filters and cover a 1.55 deg2 field centered on the galaxy,
corresponding to an area about 90*90kpc2 at the distance of
NGC 5128. All the fields were taken under exceptionally high-quality
seeing conditions (FWHM=0.4-0.5" in R). Using this material we are
able, for the first time in the literature, to construct a homogeneous
list of GC candidates covering a wide span of the NGC 5128 halo and
unusually free of field contaminants (foreground stars and faint
background galaxies). Selecting the measured objects by color,
magnitude, ellipticity, and profile size gives us a final catalog of
833 new high-quality GC candidates brighter than R=21 (0.8mag fainter
than the standard GC luminosity function turnover point). The measured
positions have better than 0.2" precision in both coordinates.
Description:
During the night of 2006 April 7, we used the Inamori Magellan Areal
Camera and Spectrograph (IMACS) camera at the Magellan Observatory
Baade telescope to image a 1.4deg2 area centered on NGC 5128
(=Centaurus A). Images were taken in standard broadband filters B and
R. Selection of new candidates for globular clusters (GC) was made by
a combination of nonstellar shape, color, magnitude, and ellipticity.
The data for our final list of 833 new Globular Clusters candidates,
are summarized in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 833 Globular cluster candidates in NGC 5128
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See also:
J/AJ/140/2101 : NGC 5128 globular clusters photometry (Sinnott+, 2010)
J/AJ/139/1871 : Kinematics of globulars in NGC 5128 (Woodley+, 2010)
J/ApJ/708/1335 : Spectroscopy of globulars in NGC 5128 (Woodley+, 2010)
J/ApJ/682/199 : Globulars with X-ray sources in NGC 5128 (Woodley+, 2008)
J/MNRAS/386/1443 : 2dF study of globular clusters in NGC 5128 (Beasley+, 2008)
J/AJ/134/494 : NGC 5128 globulars UBVRICMT1 phot. & RV (Woodley+, 2007)
J/AJ/132/2187 : MCT1 photometry of NGC 5128 globulars (Harris+, 2006)
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/AJ/128/712 : Washington Photometry in NGC 5128 (Harris+, 2004)
J/AJ/128/723 : Washington Photometry in NGC 5128. II (Harris+, 2004)
J/A+A/369/812 : UVKs photometry of globulars in NGC 5128 (Rejkuba, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.7 deg RAdeg [200.488/202.223] Right Ascension (J2000)
13- 23 F11.7 deg DEdeg [-43.6386/-42.3949] Declination (J2000)
25- 30 F6.3 mag Bmag [16.6/22.9] IMACS B band magnitude
32- 37 F6.3 mag Rmag [15.2/21.0] IMACS R band magnitude
39- 43 F5.3 mag B-R IMACS (B-R) color index
45- 51 F7.3 arcmin delRA [-38.5/37.7] Location relative to galaxy
center along Right Ascension
53- 59 F7.3 arcmin delDE [-37.2/37.5] Location relative to galaxy
along Declination
61- 66 F6.3 arcmin Rgc Projected galactocentric distance
68- 72 F5.3 --- ell [0/1]? ellipticity (1)
74- 79 F6.3 pix FWHM [3.5/25]? Full-Width at Half-Maximum (2)
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Note (1): SExtractor (SE; Bertin & Arnouts, 1996A&AS..117..393B 1996A&AS..117..393B) parameter
of ellipticity e=1-(b/a)
Note (2): SExtractor (SE; Bertin & Arnouts, 1996A&AS..117..393B 1996A&AS..117..393B) parameter
of FWHM used to identify clearly nonstellar objects (see Section 2.1).
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Nomenclature note:
In table 1, globular clusters are <[HGH2012] DDD.ddddddd+DD.ddddddd> in
Simbad.
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 23-May-2013