New data on the variability of the spectrum of Kaz 163

Kazarian, M. A.; Rafanelli, P.; Tamazian, V. S.; Turatto, M.

doi:10.1007/bf02113989

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…In this regard, the spectra of Kaz 701 are similar to those of Kaz 163 [7], with the sole difference that these components of the Hα and Hβ lines were observed on both sides in the latter galaxy (i.e., on both the red and blue sides). The observations of Kaz 163 showed that these components also vanished three years after the initial observations [7][8][9]. [OIII]λ5007 and Hβ.…”

Section: Discussion Of Resultsmentioning

confidence: 97%

Variability of the spectrum of the galaxy kaz 701

Kazarian¹,

Petrosyan²

2011

Astrophysics

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Results from a spectrophotometric study of the galaxy Kaz 701 are presented. Spectra of this galaxy were obtained on the 2.6-m telescope at the Byurakan Observatory with the SCORPIO spectral camera. In the spectra of Kaz 701, strong Hα, [OIII] λλ5007, 4959, and Hβ emission were observed, and the [SII]λλ6731, 6717 lines were observed with moderate intensities, while the [NII]λ6584 line was scarcely noticeable in the spectra obtained in 2004, but was much more intense in the spectra of 2009. The lines observed in the spectrum of this galaxy are typical of type Sy2 galaxies. A component was observed in the red wings of both the Hα and Hβ lines in the data of 2004, but, although these lines were stronger, these components were absent in the spectra taken in 2009. The relative intensities, equivalent widths, and half widths of these lines are given. These data, obtained in different observation periods (2004 and 2009), differ greatly; that is, the emission is variable.

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Section: Discussion Of Resultsmentioning

confidence: 97%

Variability of the spectrum of the galaxy kaz 701

Kazarian¹,

Petrosyan²

2011

Astrophysics

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“…Another burst of this sort has been observed in the UV-excess galaxy Kaz 163 [28]. If the reduction in velocity is caused by the gravitational attraction of the galactic nucleus, whose mass is many orders of magnitude greater than the ejected cloud itself, then this raises a number of interesting theoretical questions that require special study.…”

Section: Explosions In the Nuclei Of Uv-excess Galaxiesmentioning

confidence: 99%

Ambartsumyan’s concept of active galactic nuclei

Khachikian

2010

Astrophysics

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As Victor Ambartsumyan, himself, noted, the concept of active galactic nuclei occupies a special place among his scientific ideas. It was proposed more than half a century ago and was recognized by the U.S. National Academy of Sciences as revolutionary, on a copernican scale. However, by no means all of its propositions were accepted at once by large parts of the astronomy community. Nevertheless, as the American astrophysicist A. R. Sandage has written, "today, not one astronomer would deny the mystery surrounding the nuclei of galaxies or that the first to recognize the rich reward held in this treasury was Viktor Ambartsumian." The purpose of this article is to acquaint the reader with the major stages in the formation and development of the concept of active galactic nuclei and with some of the work on this topic done at the Byurakan and other astrophysical observatories throughout the world.

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“…For example, Seyfert galaxy Kaz 17 is distinctive among the other KG by the quantity of emission and in particular FeI absorption lines [34,36]. The X-ray source Kaz 102 (QSO) shows dramatic and unexplained variability in different ranges of its spectrum [14,17,35,[39][40][41], and Kaz 163 also shows strong variability in the spectrum [18,19,21,27,29,42] etc..…”

Section: Introductionmentioning

confidence: 99%

“…and Kaz 163 also shows strong variability in the spectrum [18,19,21,27,29,42] etc.. KGs have a wide range of physical parameters. Their linear diameters cover broad range of values from a few kpc (BCDs) up to a hundred kpc; they span a wide luminosity range between -23 and -13 mag and have a very broad range of morphological structure as well as different stages of activity from QSOs to BCDs.…”

Section: Introductionmentioning

confidence: 99%

A catalog of Kazarian galaxies

et al. 2010

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The entire Kazarian galaxies (KG) catalog is presented which combines extensive new measurements of their optical parameters with a literature and database search. The measurements were made using images extracted from the STScI Digitized Sky Survey (DSS) of Jpg(blue), Fpg(red) and Ipg(NIR) band photographic sky survey plates obtained by the Palomar and UK Schmidt telescopes. We provide accurate coordinates, morphological type, spectral and activity classes, blue apparent diameters, axial ratios, position angles, red, blue and NIR apparent magnitudes, as well as counts of neighboring objects in a circle of radius 50 kpc from centers of KG. Special attention was paid to the individual descriptions of the galaxies in the original Kazarian lists, which clarified many cases of misidentifications of the objects, particularly among interacting systems. The total number of individual Kazarian objects in the database is now 706. We also include the redshifts which are now available for 404 galaxies and the 2MASS infrared magnitudes for 598 KG. The database also includes extensive notes, which summarize information about the membership of KG in different systems of galaxies, and about revised activity classes and redshifts. An atlas of several interesting subclasses of KG is also presented.Comment: 15 pages, 5 figures, 1 table, Accepted in Astrophysics, Vol. 53, No. 1, 2010 (English translation of Astrofizika

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New data on the variability of the spectrum of Kaz 163

Cited by 5 publications

References 2 publications

Variability of the spectrum of the galaxy kaz 701

Variability of the spectrum of the galaxy kaz 701

Ambartsumyan’s concept of active galactic nuclei

A catalog of Kazarian galaxies

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