J/AJ/142/88 Segue 3 photometric and kinematic data (Fadely+, 2011)
Segue 3: an old, extremely low luminosity star cluster in the Milky Way's halo.
Fadely R., Willman B., Geha M., Walsh S., Munoz R.R., Jerjen H.,
Vargas L.C., Da Costa G.S.
<Astron. J., 142, 88 (2011)>
=2011AJ....142...88F 2011AJ....142...88F
ADC_Keywords: Galaxies, nearby ; Radial velocities ; Photometry, SDSS
Keywords: galaxies: dwarf - galaxies: star clusters: general -
Galaxy: kinematics and dynamics -
globular clusters: individual (Segue 3)
Abstract:
We investigate the kinematic and photometric properties of the Segue 3
Milky Way companion using Keck/DEIMOS spectroscopy and Magellan/IMACS
g- and r-band imaging. Using maximum likelihood methods to analyze the
photometry, we study the structure and stellar population of Segue 3.
We find that the half-light radius of Segue 3 is 26"±5"
(2.1±0.4pc, for a distance of 17kpc) and the absolute magnitude is a
mere MV=0.0±0.8mag, making Segue 3 the least luminous old stellar
system known.
Description:
We observed Segue 3 using Magellan/IMACS during engineering time on
2010 August 21.
The spectroscopic data were taken with the Keck II 10m telescope and
the DEIMOS spectrograph on 2009 November 16 and 2010 May 16.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 110 32 Photometric and Kinematic Data for Keck/DEIMOS
Sample. I. Candidate Members
table2.dat 110 100 Photometric and Kinematic Data for Keck/DEIMOS
Sample. II. Non-members
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See also:
J/MNRAS/397/1748 : Spectroscopic study of Segue 2 (Belokurov+, 2009)
J/ApJ/692/1464 : Spectroscopy of Segue 1 (Geha+, 2009)
J/ApJ/733/46 : Velocity measurements in Segue 1 (Simon+, 2011)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number, <[FWG2011] NNN> in Simbad
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 14 F4.1 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 26 F4.1 arcsec DEs Declination (J2000)
28- 31 F4.2 arcmin Dist Radial distance from center of Segue 3
33- 36 F4.1 mag rmag Sloan r-band magnitude
38- 41 F4.2 mag g-r g-r colour index
43- 52 A10 --- Date Date of observation or "Combined" when two
observations
54- 59 F6.1 km/s HV Heliocentric velocity for Date
61- 64 F4.1 km/s e_HV rms uncertainty on HV (1)
66- 75 A10 --- Date1 Date of first observation
77- 82 F6.1 km/s HV1 ? Heliocentric velocity for Date1
84- 87 F4.1 km/s e_HV1 ? rms uncertainty on HV1 (1)
89- 98 A10 --- Date2 Date of second observation
100-105 F6.1 km/s HV2 ? Heliocentric velocity for Date2
107-110 F4.1 km/s e_HV2 ? rms uncertainty on HV2 (1)
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Note (1): Velocity error bars were determined from measurement overlaps
as discussed in Section 2.2.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Nov-2012