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 2003PAZh...29..253B
=2003AstL...29..214B 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 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:
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FileName Lrecl Records Explanations
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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
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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 files: objects?.dat
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Bytes Format Units Label Explanations
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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)
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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- 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
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Note (1): Concentration parameter, C=log(rt/rc), where
rt = the outer cluster radius,
rc = the core radius
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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
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(End) Veta Avedisova (INASAN) 14-Oct-2003