J/MNRAS/431/1405 griz and CT1 photometry in M87 (Forte+, 2013)
Multicolour-metallicity relations from globular clusters in NGC 4486 (M87).
Forte J.C., Faifer F.R., Vega E.I., Bassino L.P., Smith Castelli A.V.,
Cellone S.A., Geisler D.
<Mon. Not. R. Astron. Soc., 431, 1405-1416 (2013)>
=2013MNRAS.431.1405F 2013MNRAS.431.1405F
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry, SDSS ;
Photometry, CMT1T2V
Keywords: galaxies: haloes - galaxies: star clusters: general
Abstract:
We present Gemini griz' photometry for 521 globular cluster (GC)
candidates in a 5.5x5.5arcmin2 field centred 3.8-arcmin to the south
and 0.9-arcmin to the west of the centre of the giant elliptical
galaxy NGC 4486. All these objects have previously published (C-T1)
photometry. We also present new (C-T1) photometry for 338 globulars,
within 1.7-arcmin in galactocentric radius, which have (g-z) colours
in the photometric system adopted by the Virgo Cluster Survey of the
Advanced Camera for Surveys of the Hubble Space Telescope (HST). These
photometric data are used to define a self-consistent multicolour grid
(avoiding polynomial fits) and preliminarily calibrated in terms of
two chemical abundance scales. The resulting multicolour
colour-chemical abundance relations are used to test GC chemical
abundance distributions. This is accomplished by modelling the 10 GC
colour histograms that can be defined in terms of the Cgriz' bands.
Our results suggest that the best fit to the GC observed colour
histograms is consistent with a genuinely bimodal chemical abundance
distribution NGC(Z). On the other side, each ('blue' and 'red') GC
subpopulation follows a distinct colour-colour relation.
Description:
The photometric observations presented in this paper were carried out
with the Fred Gillette 8-m Telescope (Gemini north) and are part of a
programme that also includes GMOS spectroscopy of a sample of selected
objects that are considered as good GCs candidates (GN-2010A-Q-21; PI:
J.C. Forte). The field (5.5-arcmin on a side), is centred 3.8-arcmin
to the south and 0.9-arcmin to the west of NGC 4486.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 74 521 Multicolour photometry for globular cluster
candidates in the NGC 4486 (M87) field
table4.dat 48 338 Globular cluster candidates with ACS and Washington
photometry within a galactocentric radius of
100arcsec in NGC 4486 (M87)
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See also:
J/ApJS/73/671 : M87 globular clusters BVI photometry (Couture+, 1990)
J/AJ/106/493 : Globular clusters in M87 (Lee+, 1993)
J/AJ/115/1801 : VRI photometry of M87 globular clusters (Harris+ 1998)
J/ApJ/513/733 : Globular cluster system in M87 (Kundu+, 1999)
J/ApJ/559/812 : Globular cluster system in M87 (Hanes+, 2001)
J/MNRAS/382/1947 : CT1 photometry in NGC 1399 and NGC 4486 (Forte+, 2007)
J/AJ/131/866 : Hot populations in M87 globular clusters (Sohn+, 2006)
J/ApJ/559/812 : Globular cluster system in M87 (Hanes+, 2001)
J/ApJ/613/279 : ACS Virgo Cluster Survey. III. M87 (Jordan+, 2004)
J/ApJ/703/42 : HST photometry of M87 globular clusters (Peng+, 2009)
J/ApJ/743/149 : Color-metallicity relations. II. M87 GCs (Yoon+, 2011)
J/ApJS/197/33 : The M87 globular cluster system (Strader+, 2011)
J/ApJ/748/29 : Spectroscopy of M87 globular clusters (Romanowsky+, 2012)
J/other/Sci/338.355 : 1.3mm VLBI detections of M87 (Doeleman+, 2012)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ID [12328/97434] Forte et al. (2007MNRAS.382.1947F 2007MNRAS.382.1947F)
number, <[FFG2007] NGC 4486 NNNNN> in Simbad
7- 11 F5.2 mag g'mag0 g' extinction-corrected magnitude
13- 17 F5.2 mag (C-g')0 (C-g') extinction-corrected colour index (G1)
19- 22 F4.2 mag (C-r')0 (C-r') extinction-corrected colour index (G1)
24- 27 F4.2 mag (C-i')0 (C-i') extinction-corrected colour index (G1)
29- 32 F4.2 mag (C-z')0 (C-z') extinction-corrected colour index (G1)
34- 37 F4.2 mag (g'-r')0 (g'-r') extinction-corrected colour index (G1)
39- 42 F4.2 mag (g'-i')0 (g'-i') extinction-corrected colour index (G1)
44- 47 F4.2 mag (g'-z')0 (g'-z') extinction-corrected colour index (G1)
49- 52 F4.2 mag (r'-i')0 (r'-i') extinction-corrected colour index (G1)
54- 57 F4.2 mag (r'-z')0 (r'-z') extinction-corrected colour index (G1)
59- 63 F5.2 mag (i'-z')0 (i'-z') extinction-corrected colour index (G1)
65- 69 F5.2 mag T1mag0 T1 extinction-corrected magnitude
71- 74 F4.2 mag (C-T1)0 C-T1 extinction-corrected colour index (G1)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 11 F11.7 deg RAdeg Right ascension (J2000)
13- 22 F10.7 deg DEdeg Declination (J2000)
24- 29 F6.3 mag T1mag0 T1 extinction-corrected magnitude (G1)
31- 36 F6.3 mag gmag0 g extinction-corrected magnitude (G1)
38- 42 F5.3 mag (C-T1)0 C-T1 extinction-corrected colour index (G1)
44- 48 F5.3 mag (g-z)0 ACS g-z extinction-corrected colour index (G1)
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Global Notes:
Note (G1): magnitudes and colour indices are corrected for interstellar
extinction and reddening.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Jun-2014