J/ApJ/516/693 Mass-to-light ratio of binary galaxies (Honma, 1999)
The mass-to-light ratio of binary galaxies
Honma M.
<Astrophys. J. 516, 693 (1999)>
=1999ApJ...516..693H 1999ApJ...516..693H
ADC_Keywords: Galaxies, nearby ; Surveys
Keywords: galaxies: fundamental parameters - galaxies: kinematics and dynamics
Abstract:
We report on the mass-to-light ratio determination based on a newly
selected binary galaxy sample, which includes a large number of pairs
whose separations exceed a few hundred kpc. The probability
distributions of the projected separation and the velocity difference
have been calculated considering the contamination of optical pairs,
and the mass-to-light (M/L) ratio has been determined based on the
maximum likelihood method. The best estimate of the M/L in the B band
for 57 pairs is found to be 28 - 36 depending on the orbital
parameters and the distribution of optical pairs (solar unit: Ho =
50 km s-1 Mpc-1). The best estimate of the M/L for 30 pure spiral
pairs is found to be 12 - 16. These results are relatively smaller
than those obtained in previous studies but are consistent with each
other within the errors. Although the number of pairs with large
separation is significantly increased compared with previous samples,
the M/L does not show any tendency of increase but is found to be
almost independent of the separation of pairs beyond 100 kpc. The
constancy of the M/L beyond 100 kpc may indicate that the typical halo
size of spiral galaxies is less than 100 kpc.
See also:
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 96 114 Data for 57 pairs in the sample
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See also:
J/A+AS/110/371 : Southern binary galaxies. I. (Soares+, 1995)
J/A+AS/125/329 : Southern binary galaxies radial velocities (de Souza+ 1997)
J/A+A/309/749 : Fundamental plane of early type galaxies (Prugniel+ 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Galaxy Name
19- 34 A16 --- Pair The galaxy paired with Name
37- 45 F9.5 deg GLON Galactic longitude
47- 55 F9.5 deg GLAT Galactic latitude
57- 60 I4 km/s Vel Redshift velocity
62- 64 I3 km/s e_Vel Uncertainty in Vel
66- 69 A4 --- MType Galactic morphological type
71- 74 F4.1 mag Bmag B band magnitude
76- 80 F5.1 kpc LCSep Luminosity-corrected separation
83- 87 F5.1 km/s LCVel Luminosity-corrected velocity difference
89- 95 F7.3 Sun M/L Mass to light ratio
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History:
From ApJ Electronic edition
(End) Greg Schwarz [AAS] 06-Mar-2000