J/ApJ/694/L144 Spectroscopic study of Leo V dSph (Walker+, 2009)
Leo V: spectroscopy of a distant and disturbed satellite.
Walker M.G., Belokurov V., Evans N.W., Irwin M.J., Mateo M.,
Olszewski E.W., Gilmore G.
<Astrophys. J., 694, L144-L147 (2009)>
=2009ApJ...694L.144W 2009ApJ...694L.144W
ADC_Keywords: Galaxies, nearby ; Photometry, SDSS ; Radial velocities
Keywords: dark matter - galaxies: dwarf - galaxies: kinematics and dynamics -
Local Group
Abstract:
We present a spectroscopic study of Leo V, a recently discovered
satellite of the Milky Way (MW). From stellar spectra obtained with
the MMT/Hectochelle spectrograph we identify seven likely members of
Leo V. Five cluster near the Leo V center (R<3') and have a velocity
dispersion of 2.4+2.41.4km/s. The other two likely members lie
near each other but far from the center (R∼13'∼700pc) and inflate
the global velocity dispersion to 3.7+2.31.4km/s.
Description:
On 2008 May 28 and 30 we obtained medium-resolution spectra of 158
Leo V targets using the Hectochelle spectrograph at the MMT Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 82 169 Hectochelle Spectroscopy of Leo V
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See also:
J/MNRAS/397/1748 : Spectroscopic study of Segue 2 (Belokurov+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [L5-]
4- 6 I03 --- Seq [1,158] Target identification
8- 9 I2 h RAh Hour of Right Ascension (J2000)
11- 12 I2 min RAm Minute of Right Ascension (J2000)
14- 18 F5.2 s RAs Second of Right Ascension (J2000)
20 A1 --- DE- Sign of the Declination (J2000)
21- 22 I2 deg DEd Degree of Declination (J2000)
24- 25 I2 arcmin DEm Arcminute of Declination (J2000)
27- 30 F4.1 arcsec DEs Arcsecond of Declination (J2000)
32- 35 F4.1 arcmin R Angular radius from Leo V center
37- 41 F5.2 mag rmag The r band magnitude
43- 46 F4.2 mag g-r The (g-r) color index
48- 53 F6.1 km/s HV Heliocentric velocity
55- 58 F4.1 km/s e_HV Uncertainty in HV
60- 64 F5.2 0.1nm sigMg ? Composite magnesium index (1)
66- 70 F5.2 0.1nm e_sigMg ? Uncertainty in sigMg (1)
72- 76 F5.3 --- Mpr Probability star belongs to population
78- 82 F5.3 --- e_Mpr Mean error in Mpr
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Note (1): Weighted sum of pseudo-equivalent widths for each individual line
of the Mg-I/Mg-b triplet (see Walker et al., 2007ApJS..171..389W 2007ApJS..171..389W).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Nov-2009