Query : 2004A&A...422..477S

2004A&A...422..477S - Astronomy and Astrophysics, volume 422, 477-482 (2004/8-1)

Anomalous fluctuations in observations of Q0957+561 A,B: Smoking gun of a cosmic string?


Abstract (from CDS):

We report the detection of anomalous brightness fluctuations in the multiple image Q0957+561A,B gravitational lens system, and consider whether such anomalies have a plausible interpretation within the framework of cosmic string theory. We study a simple model of gravitational lensing by an asymmetric rotating string. An explicit form of the lens equation is obtained and approximate relations for magnification are derived. We show that such a model with typical parameters of the GUT string can quantitatively reproduce the observed pattern of brightness fluctuations. On the other hand explanation involving a binary star system as an alternative cause requires an unacceptably large massive object at a small distance. We also discuss possible observational manifestations of cosmic strings within our lens model.

Abstract Copyright:

Journal keyword(s): cosmology: miscellaneous - gravitational lensing - galaxies: quasars: individual: Q0957+561 - dark matter - elementary particles cosmology

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 8C 0958+561 QSO 10 01 20.6918953728 +55 53 55.593949272   17.16 16.95     ~ 729 3
2 QSO B0957+5608B QSO 10 01 20.8375795656 +55 53 49.543053252   17.16 16.95     ~ 278 1
3 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7021 3

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