J/ApJ/653/240 Low-mass SDSS dwarf galaxy properties (Geha+, 2006)
The baryon content of extremely low mass dwarf galaxies.
Geha M., Blanton M.R., Masjedi M., West A.A.
<Astrophys. J., 653, 240-254 (2006)>
=2006ApJ...653..240G 2006ApJ...653..240G
ADC_Keywords: Galaxies, photometry ; H I data ; Morphology
Keywords: galaxies: dwarf - galaxies: kinematics and dynamics
Abstract:
We investigate the gas content and baryonic Tully-Fisher relationship
for extremely low luminosity dwarf galaxies in the absolute magnitude
range -13.5>Mr-5logh70>-16. The sample is selected from the Sloan
Digital Sky Survey and consists of 101 galaxies for which we have
obtained follow-up HI observations using the Arecibo Observatory and
Green Bank Telescope. This represents the largest homogeneous sample
of dwarf galaxies at low luminosities with well-measured HI and
optical properties. The sample spans a range of environments, from
dense groups to truly isolated galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 105 101 Low-Mass SDSS Dwarf Galaxy Properties
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Name Galaxy name (1)
8- 9 I2 h RAh Right ascension (J2000.0)
11- 12 I2 min RAm Right ascension (J2000.0)
14- 17 F4.1 s RAs Right ascension (J2000.0)
19 A1 --- DE- Declination sign (J2000.0)
20- 21 I2 deg DEd Declination (J2000.0)
23- 24 I2 arcmin DEm Declination (J2000.0)
26- 29 F4.1 arcsec DEs Declination (J2000.0)
31- 34 F4.1 Mpc Dist Distance (in Mpc/h70) (3)
36- 40 F5.2 mag rmag Apparent r magnitude (2)
42- 47 F6.2 mag rMAG Absolute r magnitude (2)
49- 52 F4.2 mag g-r g-r colour index (2)
54- 57 F4.1 mag/arcsec2 mueff Effective surface brightness in r band (4)
59- 61 F3.1 kpc reff Effective radius in r band, in kpc (4)
63 A1 --- --- [(]
64- 67 F4.1 arcsec reff2 Effective radius in r band, in arcsec (4)
68 A1 --- --- [)]
70- 73 F4.2 --- b/a Axis ratio (b/a) (4)
75- 78 F4.2 [solMass] logMstar Star mass (5)
80- 83 F4.2 [solMass] logMHI ? HI mass (10) (6)
85- 88 F4.2 [solMass] e_logMHI ? rms uncertainty on HI mass (10) (9)
90- 94 F5.1 km/s Wh ? HI velocity half-width at 20% (10) (7)
96-100 F5.1 km/s Wh(i,t) ? HI half-width corrected for inclination
and turbulence (10) (8)
102-105 F4.1 km/s e_Wh(i,t) ? rms uncertainty on Wh(i,t) (9) (10)
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Note (1): Galaxy names are based on position in the Blanton et al.
(2005AJ....129.2562B 2005AJ....129.2562B) low-luminosity SDSS catalog. In Simbad,
galaxies identified as SDSS JHHMMSS.ss+DDMMSS.s
Note (2): Absolute magnitudes and colors have been corrected for Galactic
extinction based on Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S).
Note (3): Distances are estimated based on a model of the local velocity
field (Willick et al., 1997ApJ...486..629W 1997ApJ...486..629W) and assume H0=70h70Mpc.km/s.
Note (4): The effective surface brightness (mueff,r), effective half-light
radius (reff,r), and axis ratio (b/a) are measured from the SDSS
r-band images.
Note (5): Stellar masses are calculated based on Bell et al.
(2003ApJS..149..289B 2003ApJS..149..289B) and a Kroupa et al. (1993MNRAS.262..545K 1993MNRAS.262..545K)
initial mass function.
Note (6): HI masses are based on our Arecibo and GBT observations.
Note (7): The HI velocity half-width, Wh (W20/2), is the observed
uncorrected 20% peak HI half-width.
Note (8): The quantity Wh(i,t) (W20i,t/2) is the HI half-width corrected
for inclination and turbulence as described in Sect. 3.2.
Note (9): Errors on the HI mass and HI line width were calculated from the
scatter in the mean quantities recovered from Monte Carlo simulations.
Note (10): Galaxies that were not detected in the radio do not have HI
properties listed in this table.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 31-Jul-2008