A spectroscopic and photometric study of NGC 2685, the prototype polar-ring galaxy |
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| Authors: | V A Hagen-Thorn L V Shalyapina G M Karataeva V A Yakovleva A V Moiseev A N Burenkov |
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| Institution: | (1) Sobolev Astronomical Institute, St. Petersburg State University, Universitetskii pr. 28, Petrodvorets, St. Petersburg, 198504, Russia;(2) Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachai-Cherkessian Republic, 369167, Russia |
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| Abstract: | We present and analyze spectroscopic and photometric observations for NGC 2685, the prototype polar-ring galaxy. The spectroscopic data were acquired using the 6 m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences with the UAGS spectrograph and a scanning Fabry-Perot interferometer, while the photometric analysis was based on images from the Hubble Space Telescope archive. We demonstrate that the subsystem usually called the “inner polar ring” is a highly inhomogeneous gas and dust disk rotating approximately in the polar plane relative to the galaxy’s main body. When the self-absorption in the disk is taken into account, a comparison of its color indices with those from model computations of the color evolution of galaxies results in an age for the disk of about 1.4 × 109 years, much lower than the previously accepted estimate. |
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