J/AJ/140/1337 RV of 111 Galactic halo stars in Virgo (Brink+, 2010)
Radial velocities of Galactic halo stars in Virgo.
Brink T.G., Mateo M., Martinez-delgado D.
<Astron. J., 140, 1337-1346 (2010)>
=2010AJ....140.1337B 2010AJ....140.1337B
ADC_Keywords: Milky Way ; Stars, pre-main sequence ; Photometry, SDSS ;
Radial velocities
Keywords: galaxies: individual (Sagittarius) - Galaxy: halo -
Galaxy: kinematics and dynamics - Galaxy: structure - Local Group -
techniques: radial velocities
Abstract:
We present multi-slit radial velocity measurements for 111 stars in
the direction of the Virgo Stellar Stream (VSS). The stars were
photometrically selected to be probable main-sequence stars in the
Galactic halo. When compared with the radial velocity distribution
expected for the halo of the Milky Way, as well as the distribution
seen in a control field, we observe a significant excess of negative
velocity stars in the field, which can likely be attributed to the
presence of a stellar stream.
Description:
Images were obtained by one of us (D. M.-D.) with the Wide Field
Camera (WFC) on the 2.5m Isaac Newton Telescope in 2004 May and 2000
June, respectively.
All spectra were obtained using multi-slit masks fabricated for use
with the Inamori-Magellan Areal Camera and Spectrograph (IMACS) with
the f/4.3 camera, on the 6.5m Baade telescope at Las Campanas
Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 69 112 Virgo field
table2.dat 69 60 Control field
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See also:
J/ApJ/691/306 : RR Lyrae candidates in Virgo stream photometry (Prior+, 2009)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Identification number, [BMM2010] NNNNNN
8- 15 A8 --- Field Field identification (1)
17- 21 F5.2 mag gmag SDSS g band magnitude; dereddened
23- 27 F5.2 mag rmag SDSS r band magnitude; dereddened
29- 30 I2 h RAh Hour of Right Ascension (J2000)
32- 33 I2 min RAm Minute of Right Ascension (J2000)
35- 39 F5.2 s RAs Second of Right Ascension (J2000)
41 A1 --- DE- Sign of the Declination (J2000)
42- 43 I2 deg DEd Degree of Declination (J2000)
45- 46 I2 arcmin DEm Arcminute of Declination (J2000)
48- 51 F4.1 arcsec DEs Arcsecond of Declination (J2000)
53- 58 F6.1 km/s Vgsr Galactic Standard of Rest velocity
(corrected of the Galactic rotation)
60- 63 F4.1 km/s e_Vgsr Velocity dispersion
65- 69 F5.2 --- RTD Tonry-Davis R value
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Note (1): Virgo fields are virgo1_1, virgo1_2 and virgo1_3.
Control fields are vircont1 and vircont2.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 07-Jul-2012