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Astron. Astrophys. 327, L13-L16

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Letter to the Editor

EGRET gamma-ray source 2EG J0809+5117,
a quasar with redshift of 1.14?

Xue-Bing Wu1,2, Qi-Bin Li2, Yong-Heng Zhao2, and Li Cao2

1Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, P.R. China
2Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, P.R. China

Received 17 April 1997 / Accepted 22 July 1997


The low dispersion (400Å/mm) spectrum of the optical counterpart of a flat-spectrum radio source 87GB 080315.5+512613, which is one of two possible radio counterparts of 2EG J0809+5117, was obtained recently. The optical counterpart, which is 2.02'' away from 87GB 080315.5+512613 and 19.3' away from 2EG J0809+5117, was identified as a quasar with redshift of 1.14. We noted that Mattox et al. (1997) suggested the other radio counterpart 87GB 080459.4+495915 (OJ 508), which is 87.1' away from 2EG J0809+5117, is the more potential identification, though it was previously suggested to be the identification (with low confidence) of another nearby EGRET source 2EG J0807+4849. Our observation suggests that it is quite possible that 87GB 080315.5+512613 is the identification of 2EG J0809+5117 rather than 87GB 080459.4+495915. But we still can not exclude the possibility of 87GB 080459.4+495915 at present. Moreover, in order to determine whether or not 87GB 080315.5+512613 is a blazar type quasar, the optical polarization and variability measures of its optical counterpart are strongly encouraged.

Key words: galaxies: active - galaxies: nuclei - gamma rays: observations - quasars: general

Send offprint requests to: Xue-Bing Wu (e-mail: wuxb@itp.ac.cn)

© European Southern Observatory (ESO) 1997

Online publication: October 14, 1997
Last change: April 6, 1998