The shapes of Shakhbazian compact groups of galaxies

Oleak, H.; Stoll, D.; Tiersch, H.; MacGillivray, H. T.

doi:10.1002/asna.2123190404

Cited by 10 publications

(9 citation statements)

References 22 publications

(18 reference statements)

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“…It is, however, necessary to take into account that the crossing time deduced from the estimated virial radius and velocity dispersion may, in fact, be larger. Indeed, ShCGs have very elongated "cigar"-like configuration (Oleak et al , 1998. Member galaxies in them move preferentially in the direction of elongation of the group (Tovmassian & Tiersch 2001).…”

Section: Discussionmentioning

confidence: 99%

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Shakhbazian compact galaxy groups

Tiersch¹,

Tovmassian²,

Stoll³

et al. 2002

A&A

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Abstract. Shakhbazian compact galaxy groups belong to the interesting class of compact groups. Because of their large number (the catalogue contains 377 entries) we are able to study the groups in different stages of evolution. Here we give the results of detailed study of four groups, ShCG 154, ShCG 166, ShCG 328 and ShCG 360. We present the redshifts of individual galaxies in groups, the results of the surface photometry in BVR, the contourplots of the surface brightness versus effective radius of galaxies, the twisting postion angle versus effective radius of galaxies, the radial velocity dispersions, the crossing times, the mass-to-luminosity ratios of groups and the results of the X-ray study. The dynamical state of groups, interactions between member galaxies, and the physical parameters of groups are discussed.

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Section: Discussionmentioning

confidence: 99%

“…The knowledge of the correct positions of member galaxies of ShCGs allowed Oleak et al (1995Oleak et al ( , 1998 to investigate the apparent ellipticity of about 300 ShCGs using the method proposed by Rood (1979). It was found that the mean apparent axial ratio 2 b/a ∼ 0.5.…”

Section: Introductionmentioning

confidence: 99%

Shakhbazian compact galaxy groups

Tiersch¹,

Tovmassian²,

Stoll³

et al. 2002

A&A

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“…It has been found that ShCGs have forms of prolate spheroids or "cigars" (Oleak et al 1995(Oleak et al , 1998. The distribution of the LG galaxies along the "cigar" shows that the whole CG+LG system has the same shape.…”

Section: Discussionmentioning

confidence: 99%

Shakhbazian compact groups: Poor clusters of galaxies

Tovmassian

Tiersch²

2001

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Abstract. The environment of 105 elongated (b/a < 0.5) ShCGs is investigated for galaxies probably associated with them. Counts of galaxies are made in two reciprocally orthogonal stripes of 5 width and 20 length passing through the center of each elongated group. The orientation of the first stripe is determined by the orientation of elongation of the distribution of the principal members of groups. It is found that there is an excess of galaxies in the narrow stripes oriented along the elongation of the group. Such peculiar distribution of the loose group members allows us to conclude that they are gravitationally bound with the compact group, and rotate around the common gravitational center. It is shown that the new-found distant members compose, together with the principal members of the compact group, a gravitationally bound, and, most probably, virialized system. All members of the system rotate around the common gravitational center. It is concluded that ShCGs are the cores of poor clusters of galaxies. They must be not young, and are relatively stable configurations. The number of such groups could be very high in the Universe.

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“…These groups generally consist of 5-15 members; the distances between galaxies are typically 3-5 times the diameter of the galaxies; most of them have a very high density of about 10 4 −10 5 galaxies per Mpc 3 . The groups have a "cigar"-like, prolate spheroid configuration (Oleak et al , 1998. At such densities and configurations Send offprint requests to: H. M. Tovmassian,3,5,6,8,9,11,12 and Table 2 are only available in electronic form at http://www.edpsciences.org…”

Section: Introductionmentioning

confidence: 99%

Shakhbazian compact galaxy groups

Tovmassian¹,

Tiersch²,

Navarro³

et al. 2004

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Abstract. In 1995 we commenced a detailed spectral and photometric study of Shakhbazian compact groups. In this paper the results on groups ShCG 181, ShCG 344, ShCG 361, and ShCG 362 are presented. The redshifts of member galaxies in groups and the radial velocity dispersions, the results of the surface photometry in BVR, the profiles of the surface brightness versus semi-major axis a (or a 1/4 ) and the twisting position angle versus semi-major axis of galaxies, virial masses, luminosities and mass-to-luminosity ratios, and the crossing times of groups are given. It is shown that some members of groups are in the process of interaction. On the basis of the results obtained in this and previous works, the general properties of thirteen ShCGs are discussed.

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The shapes of Shakhbazian compact groups of galaxies

Cited by 10 publications

References 22 publications

Shakhbazian compact galaxy groups

Shakhbazian compact galaxy groups

Shakhbazian compact groups: Poor clusters of galaxies

Shakhbazian compact galaxy groups

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