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J/AJ/137/3100       Radial velocities of 4 dSph galaxies         (Walker+, 2009)

Stellar velocities in the Carina, Fornax, Sculptor, and Sextans dSph galaxies: data from the Magellan/MMFS survey. Walker M.G., Mateo M., Olszewski E.W. <Astron. J., 137, 3100-3108 (2009)> =2009AJ....137.3100W
ADC_Keywords: Galaxies, nearby ; Radial velocities Keywords: galaxies: dwarf - galaxies: individual (Carina, Fornax, Sculptor, Sextans) - galaxies: kinematics and dynamics - Local Group - techniques: radial velocities Abstract: We present spectroscopic data for individual stars observed from 2004 March through 2008 August as part of our Michigan/MIKE Fiber System (MMFS) survey of four dwarf spheroidal (dSph) galaxies: Carina, Fornax, Sculptor, and Sextans. Using MMFS at the Magellan/Clay Telescope at Las Campanas Observatory, we have acquired 8855 spectra from 7103 red-giant candidates in these Galactic satellites. We list measurements of each star's line-of-sight velocity (median error ±2.1km/s) and spectral line indices for iron and magnesium absorption features. Description: We refer the reader to Paper I (Walker et al., 2006, Cat. J/AJ/131/2114) for a description of MMFS and the details of our methodology regarding target selection, observing procedure, and data reduction. After the publication of Paper I, we obtained new data during observing runs in 2007 January, 2007 September, 2008 April, and 2008 August. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 119 2400 MMFS Spectroscopic Data - Carina table3.dat 119 3150 MMFS Spectroscopic Data - Fornax table4.dat 119 1818 MMFS Spectroscopic Data - Sculptor table5.dat 119 1487 MMFS Spectroscopic Data - Sextans
See also: J/AJ/131/2114 : Radial velocities in Fornax dSph (Walker+, 2006) Byte-by-byte Description of file: table[2345].dat
Bytes Format Units Label Explanations
1- 8 A8 --- Target Target identification; Galaxy-ID number 10- 13 A4 --- Field Field and spectrograph channel (B=blue, R=red) 15- 22 F8.3 d HJD Heliocentric Julian Date minus 2450000 of obs. 24- 25 I2 h RAh Hour of Right Ascension (J2000) 27- 28 I2 min RAm Minute of Right Ascension (J2000) 30- 34 F5.2 s RAs Second of Right Ascension (J2000) 36 A1 --- DE- Sign of the Declination (J2000) 37- 38 I2 deg DEd Degree of Declination (J2000) 40- 41 I2 arcmin DEm Arcminute of Declination (J2000) 43- 46 F4.1 arcsec DEs Arcsecond of Declination (J2000) 48- 52 F5.2 mag Vmag ? Apparent V band magnitude 54- 58 F5.2 mag V-I ? The (V-I) color index 60- 65 F6.1 km/s HV Heliocentric rest frame velocity 67- 70 F4.1 km/s e_HV Uncertainty in HV 72- 76 F5.2 0.1nm SigFe ? The ΣFe spectral index (Å) 78- 81 F4.2 0.1nm e_SigFe ? Uncertainty in SigFe (Å) 83- 87 F5.2 0.1nm SigMg ? The ΣMg spectral index (Å) 89- 92 F4.2 0.1nm e_SigMg ? Uncertainty in SigMg (Å) 94- 98 F5.3 --- Mmb ? Probability membership 100-104 F5.1 km/s <HV> ? Weighted mean Heliocentric rest frame velocity 106-108 F3.1 km/s e_<HV> ? Uncertainty in <HV> 110-114 F5.2 0.1nm <SigMg> ? Weighted mean ΣMg spectral index (Å) 116-119 F4.2 0.1nm e_<SigMg> ? Uncertainty in <SigMg> (Å)
History: From electronic version of the journal References: Walker et al., Paper I 2006AJ....131.2114W, Cat. J/AJ/131/2114
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 24-Aug-2011
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