Access to Astronomical Catalogues

← Click to display the menu
J/AJ/132/1593  BVR photometry of NGC 4594 globular clusters  (Spitler+, 2006)

Hubble space telescope ACS wide-field photometry of the Sombrero galaxy globular cluster system. Spitler L.R., Larsen S.S., Strader J., Brodie J.P., Forbes D.A., Beasley M.A. <Astron. J., 132, 1593-1609 (2006)> =2006AJ....132.1593S
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry, UBVRI Keywords: galaxies: individual (M104, NGC 4594) - galaxies: spiral - galaxies: star clusters Abstract: A detailed imaging analysis of the globular cluster (GC) system of the Sombrero galaxy (NGC 4594) has been accomplished using a six-image mosaic from the Hubble Space Telescope Advanced Camera for Surveys. The quality of the data is such that contamination by foreground stars and background galaxies is negligible for all but the faintest 5% of the GC luminosity function. This enables the study of an effectively pure sample of 659 GCs until ∼2mag fainter than the turnover magnitude, which occurs at MTOMV=-7.60±0.06 for an assumed m-M=29.77. Two GC metallicity subpopulations are easily distinguishable, with the metal-poor subpopulation exhibiting a smaller intrinsic dispersion in color compared to the metal-rich subpopulation. Description: The Hubble Heritage Project sponsored a six-pointing, ACS mosaic of the Sombrero galaxy (principal investigator: K. Noll, HST PID 9714). Each pointing consisted of 4x675s exposures with the F435W (B) filter, 4x500s with the F555W (V) filter, and 4x350s with the F625W (R) filter. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 101 659 Globular clusters in NGC 4594
See also: J/MNRAS/401/1965 : Globular clusters in M104 (Harris+, 2010) J/ApJ/599/1067 : X-ray sources in M104 (Di Stefano+, 2003) J/MNRAS/327/1116 : VI photometry of Sombrero globular clusters (Larsen+, 2001) J/MNRAS/376/960 : X-ray emission from the Sombrero galaxy (Li+, 2007) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [SLS2006] Running globular cluster identification number 5- 6 I2 h RAh Hour of Right Ascension (J2000) 8- 9 I2 min RAm Minute of Right Ascension (J2000) 11- 15 F5.2 s RAs Second of Right Ascension (J2000) 17 A1 --- DE- Sign of the Declination (J2000) 18- 19 I2 deg DEd Degree of Declination (J2000) 21- 22 I2 arcmin DEm Arcminute of Declination (J2000) 24- 28 F5.2 arcsec DEs Arcsecond of Declination (J2000) 30- 33 F4.2 arcmin RGC Distance from NGC 4594 center 35- 39 F5.2 mag Bmag The B band magnitude (1) 41- 44 F4.2 mag e_Bmag The error in Bmag 46- 50 F5.2 mag Vmag The V band magnitude (1) 52- 55 F4.2 mag e_Vmag The error in Vmag 57- 61 F5.2 mag Rmag The R band magnitude (1) 63- 66 F4.2 mag e_Rmag The error in Rmag 68- 71 F4.2 mag B-V The (B-V) color index (1) 73- 76 F4.2 mag e_B-V The error in B-V 78- 81 F4.2 mag B-R The (B-R) color index (1) 83- 86 F4.2 mag e_B-R The error in B-R 88- 91 F4.2 mag V-R The (V-R) color index (1) 93- 96 F4.2 mag e_V-R The error in V-R 98-101 F4.2 pc Rhl Half-light radius (2)
Note (1): Since the photometric transformations to the standard systems depend on an object's color, the band magnitudes were derived twice using the two relevant colors. Differences between the same bands for a given object were infrequent and varied by no more than 0.03mag. The B and V magnitudes presented here were derived from B-V colors and R was from B-R. Note (2): A distance modulus of 29.77 is assumed. See text for derivation.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 11-Jul-2008
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

catalogue service

© UDS/CNRS

Contact