J/ApJ/763/40 UBVI photometry of GCs in the Fornax galaxy cluster (Kim+, 2013)
Wide-field multiband photometry of globular cluster systems in the Fornax
galaxy cluster.
Kim H.-S., Yoon S.-J., Sohn S.T., Kim S.C., Kim E., Chung C., Lee S.-Y.,
Lee Y.-W.
<Astrophys. J., 763, 40 (2013)>
=2013ApJ...763...40K 2013ApJ...763...40K
ADC_Keywords: Clusters, globular ; Photometry, UBVRI
Keywords: galaxies: individual (NGC 1387, NGC 1399, NGC 1404);
galaxies: star clusters: general
Abstract:
We present wide-field multiband photometry of globular cluster (GC)
systems in NGC 1399, NGC 1404, and NGC 1387 located in the central
region of the Fornax galaxy cluster. Observation was carried out
through U, B, V, and I bands, which marks one of the widest and
deepest U-band studies on extragalactic GC systems. The present U-band
photometry enables us to significantly reduce the contamination by a
factor of two for faint sources (V0∼23.5). The main results based
on some 2000 GC candidates around NGC 1399, NGC 1404, and NGC 1387 are
as follows: (1) the GC system in each galaxy exhibits bimodal color
distributions in all colors examined, but the shape of color
histograms varies systematically depending on colors; (2) NGC 1399
shows that the mean colors of both blue and red GCs become bluer with
increasing galactocentric radius; (3) NGC 1399 shows overabundance of
GCs in the directions of NGC 1404 and NGC 1387, indicating their
ongoing interactions; and (4) NGC 1399 also exhibits a ∼0.'5 offset
between the center of the inner GC distribution and the galaxy's
optical center, suggesting that NGC 1399 is not yet dynamically
relaxed and may be undergoing merger events.
Description:
The observations were carried out on the nights of 2006 November 24
and 28 (UT) with the Mosaic II CCD imager mounted on the prime focus
of the 4m Blanco telescope at Cerro Tololo Inter-American Observatory
(CTIO).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 79 2037 UBVI photometry of GC candidates in the
Fornax galaxy cluster
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See also:
J/ApJ/746/88 : HST observations of GCs in NGC 1399 (Blakeslee+, 2012)
J/ApJ/743/149 : Color-metallicity relations. II. M87 GCs (Yoon+, 2011)
J/ApJ/736/90 : Chandra X-ray sources of NGC 1399 (Paolillo+, 2011)
J/MNRAS/416/155 : GCs in five early-type galaxies (Faifer+, 2011)
J/A+A/513/A52 : Velocities of NGC 1399 globular clusters (Schuberth+, 2010)
J/AJ/137/498 : UCD and bright GC in Fornax (Gregg+, 2009)
J/A+A/477/L9 : Globular clusters around NGC 1399 (Schuberth+, 2008)
J/A+A/464/L21 : Velocities of globular clusters in Fornax (Bergond+, 2007)
J/ApJS/169/213 : ACS Fornax Cluster Survey. I. (Jordan+, 2007)
J/MNRAS/382/1947 : CT1 photometry in NGC 1399 and NGC 4486 (Forte+, 2007)
J/MNRAS/367/156 : C-T1 photometry in NGC 1374, 1379 and 1387 (Bassino+, 2006)
J/AJ/127/2114 : Globular clusters around NGC 1399 (Dirsch+, 2004)
J/A+AS/139/393 : Young Massive Star Clusters. II. (Larsen, 1999)
J/AJ/105/1762 : Globular clusters around NGC 1399 (Ostrov+ 1993)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Globular cluster identification number
6- 15 F10.7 deg RAdeg [54.1/54.9] Right Ascension (J2000)
17- 27 F11.7 deg DEdeg [-35.9/-35.2] Declination (J2000)
29- 34 F6.3 mag U0mag [21.2/25.3] Intrinsic U band magnitude
(Johnson U system; see section 2.1)
36- 40 F5.3 mag e_U0mag [0.007/0.2] The RMS uncertainty in U0mag
42- 47 F6.3 mag B0mag [21.3/25] Intrinsic B band magnitude
49- 53 F5.3 mag e_B0mag [0.004/0.1] The RMS uncertainty in B0mag
55- 60 F6.3 mag V0mag [20.6/24.3] Intrinsic V band magnitude
62- 66 F5.3 mag e_V0mag [0.005/0.2] The RMS uncertainty in V0mag
68- 73 F6.3 mag I0mag [19.5/23.5] Intrinsic I band magnitude
75- 79 F5.3 mag e_I0mag [0.003/0.11] The RMS uncertainty in I0mag
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Oct-2014