Papers by Gagik Tovmassian
Astrophysics, 2010
ABSTRACT By observations with the 1.5m telescope at San Pedro Martir (OAN, UNAM, Mexico) the BVR ... more ABSTRACT By observations with the 1.5m telescope at San Pedro Martir (OAN, UNAM, Mexico) the BVR magnitudes are determined for 66 member galaxies in Shakhbazian Compact Galaxy Groups ShCG 40, ShCG 176, ShCG 270, ShCG 278, ShCG 310, and ShCG 342. Three other groups were observed in two or only in one band. Seven galaxies in ShCG 298 were observed in B and R, six galaxies in ShCG 95 were observed in V, and seven galaxies in ShCG 345 were observed in V and R. The distribution of brightness of observed galaxies is determined. Signs of interaction between galaxies are detected in some groups. Keywordsgalaxies:groups:photometry
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Revista mexicana de astronomía y astrofísica
Shakhbazian compact galaxy groups are the most dense configurations known. A few years ago we com... more Shakhbazian compact galaxy groups are the most dense configurations known. A few years ago we commenced a detailed spectral and photometric study of these groups. In this paper we present the investigation results of groups ShCG 31, ShCG 38, ShCG 43, and ShCG 282. The redshifts of member galaxies, the results of the BVR photometry, the surface-brightness profiles, the curves of isophotal twisting, the estimated masses, luminosities, and the mass-to-luminosity ratios of groups, and also some dynamical parameters, as the radial velocity dispersion and the crossing time are presented. The studied ShCGs consist mostly of elliptical and lenticular galaxies. It is shown that some galaxies in groups are in the process of interaction.
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Astronomische Nachrichten, 2005
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Astronomy and Astrophysics, 2004
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Revista Mexicana de …, 2007
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The Astrophysical Journal, 2010
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We present X-ray observations of the close binary nucleus of the planetary nebula PN G135.9+55.9 ... more We present X-ray observations of the close binary nucleus of the planetary nebula PN G135.9+55.9 obtained with the XMM satellite. The nebula is the most oxygen-poor PN known to date and is located in the Galactic halo. It is known to harbor a close binary nucleus of which only one component can be observed in optical-UV range. New X-ray observations
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Astronomy and Astrophysics, 2010
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Papers by Gagik Tovmassian