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 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:
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FileName Lrecl Records Explanations
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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
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See also:
J/AJ/131/2114 : Radial velocities in Fornax dSph (Walker+, 2006)
Byte-by-byte Description of file: table[2345].dat
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Bytes Format Units Label Explanations
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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 ? Weighted mean Heliocentric rest frame velocity
106-108 F3.1 km/s e_ ? Uncertainty in
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)
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History:
From electronic version of the journal
References:
Walker et al., Paper I 2006AJ....131.2114W 2006AJ....131.2114W, Cat. J/AJ/131/2114
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 24-Aug-2011