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J/MNRAS/327/1116    VI photometry of Sombrero globular clusters (Larsen+, 2001)

Hubble Space Telescope photometry of globular clusters in the Sombrero galaxy. Larsen S.S., Forbes D.A., Brodie J.P. <Mon. Not. R. Astron. Soc. 327, 1116 (2001)> =2001MNRAS.327.1116L
ADC_Keywords: Clusters, globular ; Photometry Keywords: galaxies: individual: M104 (NGC 4594) - galaxies: spiral - galaxies: star clusters Abstract: We explore the rich globular cluster (GC) system of the nearby Sa galaxy M104, the "Sombrero" (NGC 4594), using archive Wide Field Planetary Camera 2 data. The GC colour distribution is found to be bimodal at the >99 per cent confidence level, with peaks at (V-I)0=0.96±0.03 and 1,21±0.03. The inferred metallicities are very similar to those of GCs in our Galaxy and M31. However, the Sombrero reveals a much enhanced number of red (metal-rich) GCs compared to other well-studied spirals. Because the Sombrero is dominated by a huge bulge and only has a modest disc, we associate the two subpopulations with the halo and bulge components, respectively. Thus our analysis supports the view that the metal-rich GCs in spirals are associated with the bulge rather than with the disc. The Sombrero GCs have typical effective (half-light) radii of ∼2pc with the red ones being ∼30 per cent smaller than the blue ones. We identify many similarities between the GC system of the Sombrero and those of both late-type spirals and early-type galaxies. Thus both the GC system and the Hubble type of the Sombrero galaxy appear to be intermediate in their nature. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 49 193 Data for clusters in the Sombrero
See also: VII/13 : Globular-Cluster Catalog (Arp 1965) VII/44 : Star Clusters Associations II. Globular Clusters (Ruprecht+ 1981) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 A5 --- [LFB2001] Cluster designation (1) 7- 8 I2 h RAh Right ascension (J2000.0) 10- 11 I2 min RAm Right ascension (J2000.0) 13- 17 F5.2 s RAs Right ascension (J2000.0) 19 A1 --- DE- Declination sign (J2000.0) 20- 21 I2 deg DEd Declination (J2000.0) 23- 24 I2 arcmin DEm Declination (J2000.0) 26- 29 F4.1 arcsec DEs Declination (J2000.0) 31- 35 F5.2 mag Vmag V magnitude (2) 37- 40 F4.2 mag (V-I)0 Dereddened V-I colour index (2) 42- 46 F5.2 pc Reff ?=99.99 Estimated effective (half-light) cluster radius 47 A1 --- u_Reff [)] Uncertainty flag for objects fainter than V=23.5
Note (1): Prefixes C, H1 and H2 denote objects in the central, outer and inner halo pointings, respectively. Note (2): V and (V-I)0 have been corrected for a foreground extinction of AV=0.17 and E(V-I)=0.086mag.
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 30-Jan-2002
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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