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J/ApJ/703/42    HST photometry of M87 globular clusters            (Peng+, 2009)

The color-magnitude relation for metal-poor globular clusters in M87: confirmation from deep HST/ACS imaging. Peng E.W., Jordan A., Blakeslee J.P., Mieske S., Cote P., Ferrarese L., Harris W.E., Madrid J.P., Meurer G.R. <Astrophys. J., 703, 42-51 (2009)> =2009ApJ...703...42P
ADC_Keywords: Clusters, globular ; Photometry, VRI ; Photometry, HST ; Galaxies, photometry Keywords: galaxies: dwarf - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: individual (M87) - galaxies: star clusters - globular clusters: general Abstract: We present a study of the M87 GC system using deep, archival HST/ACS imaging with the F606W and F814W filters, in which we find a significant color-magnitude relation for the metal-poor globular clusters (GCs). The slope of this relation in the I versus V-I color-magnitude diagram (γI=-0.024±0.006) is perfectly consistent with expectations based on previously published results using data from the ACS Virgo Cluster Survey. We show that previously measured half-light radii of M87 GCs from best-fit PSF-convolved King models are consistent with the more accurate measurements in this study, and we also explain how the color-magnitude relation for metal-poor GCs is real and cannot be an artifact of the photometry. We fit Gaussian and evolved Schechter functions to the luminosity distribution of GCs across all colors, as well as divided into blue and red subpopulations, finding that the blue GCs have a brighter mean luminosity and a narrower distribution than the red GCs. Finally, we present a catalog of astrometry and photometry for 2250 M87 GCs. Description: M87 was observed for 50 orbits with the ACS Wide Field Channel (WFC) in the F606W (V606) and F814W (I814) filters for a microlens monitoring program (HST GO Program 10543, PI Baltz). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 53 2250 Positions and KINGPHOT photometry for M87 GCs
See also: B/hst : HST Archived Exposures Catalog (STScI, 2007) J/ApJ/671/1624 : NGC 1533 globular cluster candidates (Degraaff+, 2007) J/AJ/131/866 : Hot populations in M87 globular clusters (Sohn+, 2006) J/ApJ/613/279 : ACS Virgo Cluster Survey. III. M87 (Jordan+, 2004) J/ApJ/559/812 : Globular cluster system in M87 (Hanes+, 2001) J/ApJ/513/733 : Globular cluster system in M87 (Kundu+, 1999) J/AJ/115/1801 : VRI photometry of M87 globular clusters (Harris+ 1998) J/AJ/106/493 : Globular clusters in M87 (Lee+, 1993) J/ApJS/73/671 : M87 globular clusters BVI photometry (Couture+, 1990) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- [PJB2009] Running identification number 6- 16 F11.7 deg RAdeg Right Ascension in decimal degrees (J2000) 18- 27 F10.7 deg DEdeg Declination in decimal degrees (J2000) 29- 34 F6.3 mag Vmag Converted V band magnitude (Vega) (1) 36- 40 F5.3 mag e_Vmag The 1σ uncertainty in Vmag 42- 47 F6.3 mag Imag Converted I band magnitude (Vega) (1) 49- 53 F5.3 mag e_Imag The 1σ uncertainty in Imag
Note (1): We converted magnitudes to V and I by using the relation between (V-I) and (mF606W-mF814W) presented in Equation (3) of DeGraaff et al. (2007, Cat. J/ApJ/671/1624), namely (V-I)=1.2(mF606W-mF814W)+0.06, and the following equation from Table 22 in Sirianni et al., 2005PASP..117.1049S; I=mF814W,OBMAG+25.495-0.002(V-I) (see section 3.1 for further details).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-Oct-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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