J/PAZh/33/403 Globular clusters as gravitational lenses (Bukhmastova+, 2007)
Quasars Lensed by Globular Clusters of Spiral and Elliptical Galaxies.
Bukhmastova Yu.L.
<Pis'ma Astron. Zh. 33, 403 (2007)>
=2007PAZh...33..403B 2007PAZh...33..403B
=2007AstL...33..355B 2007AstL...33..355B
ADC_Keywords: Galaxies, optical ; QSOs ; Clusters, globular
Abstract:
Based on the SDSS catalog, we have found new close quasar-galaxy
pairs. We analyze the radial distribution of quasars from pairs around
galaxies of different types. We show that the quasars from pairs
follow the density profile of halo globular clusters. This is new
observational evidence that the quasars projected onto the halos of
galaxies are magnified by gravitational lensing by halo globular
clusters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 64 Close quasar-galaxy pairs found based on the
catalog of quasars and LEDA database
table2.dat 142 64 Close quasar-galaxy pairs found based on the
fourth version of the SDSS catalog
table4.dat 34 18 Estimated number of globular clusters in spiral
and elliptical galaxies
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See also:
J/AZh/78/675 : Quasar-galaxy associations (Bukhmastova, 2001)
http://www.sdss.org/ : SDSS Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Quasar-galaxy pair number in the original
catalog (J/AZh/78/675)
7- 21 A15 --- NameQ Name of quasar (1)
24- 31 F8.6 rad RArad Right Ascension (J2000) of quasar
34- 41 F8.5 rad DErad Declination (J2000) of quasar
44- 48 F5.3 --- zQ Quasar redshift
51- 55 F5.2 mag mQ Apparent magnitude of quasar
58- 68 A11 --- NameG Name of galaxy
71- 76 F6.4 --- zG Galaxy redshift
79- 83 F5.1 kpc Dist Distance from galaxy center to
quasar projection in kpc
86- 90 F5.2 arcsec Dista Distance from galaxy center to
quasar projection in arcsec
93- 98 F6.4 arcsec Q Presumed splitting angle between quasar images
under the assumption that the mass of
gravitational lens is 3*105solMass
101-107 A7 --- GType Type of the galaxy (2)
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Note (1): We used catalog "Quasars and active galactic nuclei" by
Veron-Cetty and Veron (ESO Sci.Rep. 18, 1998, See Cat. VII/248).
Note (2): Galaxy type is taken from NED database: nedwww.ipac.caltech.edu
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Pair Quasar-galaxy pair number in the sample
5- 22 A18 --- NameQ Quasar identification number in SDSS catalog
25- 42 A18 --- NameG Galaxy identification number in SDSS catalog
46- 53 F8.6 rad RArad Right Ascension (J2000) of quasar
55- 63 F9.6 rad DErad Declination (J2000) of quasar
66- 73 F8.6 rad RAg.rad Right Ascension (J2000) of galaxy
75- 83 F9.6 rad DEg.rad Declination (J2000) of galaxy
86- 92 F7.5 --- zQ Quasar redshift
95-101 F7.5 --- zG galaxy redshift
104-109 F6.3 mag mQ Apparent magnitude of quasar
112-117 F6.3 mag mG Apparent magnitude of galaxy
120-125 F6.3 mag g'-r' Color index of galaxy
128-132 F5.1 kpc Dist Distance from the galaxy center to quasar
projection
135-142 F8.6 arcsec Q Presumed splitting angle between quasar images
under the assumption that the mass of
gravitational lens is 3*105solMass
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Table3: Classification of SDSS galaxies according to their color indexes
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Galaxy type g'-r- g'-r' (z=0.2)
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E 0.77 1.31
S0 0.68 1.13
Sab 0.66 1.02
Sbc 0.52 0.71
Scd 0.48 0.62
Im 0.20 0.32
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Galaxy Galaxy name
13- 17 A5 --- MType Galaxy type
20- 22 I3 --- Nqso Number of quasars
24- 34 A11 --- Nhgc Number of halo globular clusters
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(End) Veta Avedisova (INASAN) 10-Oct-2007