Globular clusters as gravitational lenses. Results of superamplification

Details Globular clusters as gravitational lenses. Results of superamplification Globular clusters as gravitational lenses. Results of superamplification

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnts...3..174y&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, Suppl, no. 3, p. 174-177

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Scientific paper

In previous works we showed that amplification of small sources by cores of globular clusters or dwarf galaxies can reach 5--10 magnitudes, if the cores are transparent. This amplification can explain the significant part of Arp's objects. The lenses for Arp's objects are globular clusters in the halos of foreground galaxies. The nuclei of Seyfert or other active galaxies can be sources for this superamplification. VLBI or other high-precision observations will confirm or rejectthis hypothesis. Here we propose new simple observational test. Let this hypothesis is valid. It is known that there can be near 102 globular clusters near ordinary galaxy. These globular clusters can produce amplification not only of active nuclei, but of ordinary nuclei and any other sources. Now ordinary galaxies are discovered at high redshifts, up to Z=5. If globular clusters in the halos of distant foreground galaxies can act as gravitational lenses, we can expect the overdensity of star-like images near foreground galaxies. We analyzed USNO A2.0 catalog in the vicinity of 35862 galaxies with redshifts 0.01--0.33, and found that mean overdensity of objects brighter than 21m is near 100 objects per galaxy. We show that this overdensity can not be explained by usual clustering of galaxies.

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