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J/A+A/513/A62 Sgr dSph VIMOS photometry and radial velocities (Giuffrida+, 2010)

A wide angle view of the Sagittarius dwarf spheroidal galaxy. I. VIMOS photometry and radial velocities across Sgr dSph major and minor axis. Giuffrida G., Sbordone L., Zaggia S., Marconi G., Bonifacio P., Izzo C., Szeifert T., Buonanno R. <Astron. Astrophys. 513, A62 (2010)> =2010A&A...513A..62G
ADC_Keywords: Galaxies, nearby ; Galaxies, photometry ; Radial velocities Keywords: Local Group - galaxies: photometry - galaxies: stellar content - globular clusters: individual: M 54 - galaxies: individual: Sgr dSph Abstract: The Sagittarius dwarf Spheroidal Galaxy (Sgr dSph) provides us with a unique possibility of studying a dwarf galaxy merging event while still in progress. Moving along a short-period, quasi-polar orbit in the Milky Way Halo, Sgr dSph is being tidally dispersed along a huge stellar stream. Due to its low distance (25kpc), the main body of Sgr dSph covers a vast area in the sky (roughly 15x7degrees). Available photometric and spectroscopic studies have concentrated either on the central part of the galaxy or on the stellar stream, but the overwhelming majority of the galaxy body has never been probed. The aim of the present study is twofold. On the one hand, to produce color magnitude diagrams across the extension of Sgr dSph to study its stellar populations, searching for age and/or composition gradients (or lack thereof). On the other hand, to derive spectroscopic low-resolution radial velocities for a subsample of stars to determine membership to Sgr dSph for the purpose of high resolution spectroscopic follow-up. Description: We used VIMOS@VLT to produce V and I photometry on 7 fields across the Sgr dSph minor and major axis, plus 3 more centered on the associated globular clusters Terzan 7, Terzan 8 and Arp 2. A last field has been centered on M 54, lying in the center of Sgr dSph. VIMOS high resolution spectroscopic mode has then been used to derive radial velocities for a subsample of the observed stars, concentrating on objects having colors and magnitudes compatible with the Sgr dSph red giant branch. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 192 270683 Catalog
See also: III/250 : The VIMOS VLT deep survey (VVDS-DEEP) (Le Fevre+ 2005) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 19 A19 --- Name Star name (JHHMMSS.ss+DDMMSS.s) 21- 22 I2 h RAh Right ascension (J2000) 24- 25 I2 min RAm Right ascension (J2000) 27- 33 F7.4 s RAs Right ascension (J2000) 35 A1 --- DE- Declination sign (J2000) 36- 37 I2 deg DEd Declination (J2000) 39- 40 I2 arcmin DEm Declination (J2000) 42- 46 F5.2 arcsec DEs [0/60] Declination (J2000) 48- 52 F5.3 deg GLon Galactic longitude 54- 60 F7.3 deg GLat Galactic latitude 62- 68 F7.4 mag Vmag V magnitude 70- 75 F6.4 mag e_Vmag rms uncertainty on Vmag 77- 83 F7.4 mag Imag I magnitude 85- 90 F6.4 mag e_Imag rms uncertainty on Imag 92- 98 F7.5 mag E(B-V) Interstellar reddening (1) 100-109 F10.6 km/s RV ?=999.999999 VIMOS radial velocity 111-120 F10.6 km/s e_RV ?=999.999999 rms uncertainty on RV 122-134 A13 --- OldID Old identification (2) 136-143 F8.3 pix Xpos X position 145-152 F8.3 pix Ypos Y position 154-163 F10.6 deg RAdeg Right ascension in decimal degrees (J2000) 165-174 F10.6 deg DEdeg Declination in decimal degrees (J2000) 176-182 F7.4 --- chi2 χ2 value 184-192 F9.4 --- Sharp Sharp parameter
Note (1): Schlegel values (1998ApJ...500..525S), corrected as per Bonifacio et al. (2000A&A...359..663B). Note (2): Old ID as originally used by the authors. Useful e.g. for finding the star in the FLAMES data.
Acknowledgements: Giuliano Giuffrida, giuliano.giuffrida(at)asdc.asi.it
(End) Patricia Vannier [CDS] 04-May-2010
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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