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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 =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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
Table3: Classification of SDSS galaxies according to their color indexes -------------------------------------------------------------------------------- Galaxy type g'-r- g'-r' (z=0.2) -------------------------------------------------------------------------------- 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 Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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

(End) Veta Avedisova (INASAN) 10-Oct-2007
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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