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J/PAZh/29/253   Globular clusters as gravitational lenses    (Bukhmastova, 2003)

Globular clusters as candidates for gravitational lenses to explain quasar-galaxy associations. Bukhmastova Yu.L. <Pis'ma Astron. Zh. 29, 253 (2003)> =2003PAZh...29..253B =2003AstL...29..214B
ADC_Keywords: Clusters, globular; Combined data Keywords: quasar - galaxy associations - gravitational lensing - globular clusters - hidden halo mass Abstract: We argue that globular clusters (GCs) are good candidates for gravitational lenses in explaining quasar-galaxy associations. The catalog of associations (Bukhmastova, 2001, Cat. J/AZh/78/675) compiled from the LEDA catalog of galaxies (Paturel, 1997A&AS..124..109P) and from the catalog of quasars (Veron-Cetty and Vero, 1998, see Cat. VII/235) is used. Based on the new catalog, we show that one might expect an increased number of GCs around irregular galaxies of types 9 and 10 from the hypothesis that distant compact sources are gravitationally lensed by GCs in the halos of foreground galaxies. The King model is used to determine the central surface densities of 135 GCs in the Milky Way. The distribution of GCs in central surface density was found to be lognormal. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file objects1.dat 34 135 Globular clusters positions objects3.dat 34 206 Galaxies positions table1.dat 51 135 The list of Milky Way globular clusters as possible mesolens candidates table3.dat 48 206 Irregular galaxies of types 9 and 10 in quasar-galaxy associations
See also: VII/202 : Globular Clusters in the Milky Way (Harris, 1997) VII/235 : Quasars and Active Galactic Nuclei (11th Ed.) (Veron+, 2003) J/AZh/78/675 : Quasar-galaxy associations (Bukhmastova, 2001) Byte-by-byte Description of file: objects?.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Cluster or galaxy name 12- 13 I2 h RAh Right Ascension (J2000) (hours) 15- 16 I2 min RAm Right Ascension (J2000) (minutes) 18- 22 F5.2 s RAs Right Ascension (J2000) (seconds) 24 A1 --- DE- Declination (J2000) (sign) 25- 26 I2 deg DEd Declination (J2000) (degrees) 28- 29 I2 arcmin DEm Declination (J2000) (minutes) 31- 34 F4.1 arcsec DEs ? Declination (J2000) (seconds)
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Cluster name 12- 15 F4.2 --- C Concentration parameter (1) 18- 21 F4.2 arcmin Rcmin Core radius 23- 27 F5.1 kpc Dist Distance to the Sun 31- 34 F4.2 [solMass] logMass Cluster mass (log(M(cluster)/M) 37- 41 F5.2 pc Rcore Core radius 43- 49 F7.3 10kg/m2 Sigmac Central surface density
Note (1): Concentration parameter, C=log(rt/rc), where rt = the outer cluster radius, rc = the core radius
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Galaxy name (PGCNNNNNNN) 13- 14 I2 --- MType ? Galaxy morphological type 15 A1 --- n_MType [p] 'p': peculiar galaxy 24- 29 A6 --- z Galaxy redshift 33- 39 A7 kpc R Assumed distance from galactic center at which the clustered object (CO) lenses are locate 42- 44 A3 --- Nqso Number of quasars projected onto the galaxy 47- 48 I2 --- Nccc ? Number of compact star clusters detected in these galaxies to date

(End) Veta Avedisova (INASAN) 14-Oct-2003
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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