Spectroscopy and photometry of ShCG 191 - Abell 1097

Tovmassian, H. M.; Tiersch, H.; Tovmassian, G.; Neizvestny, S. I.; Torres‐Papaqui, J. P.; Pramskij, A. G.

doi:10.1002/asna.200410359

Cited by 8 publications

(15 citation statements)

References 25 publications

(30 reference statements)

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“…Most Hickson Compact Groups (HCGs) are dynamically associated with larger loose groups (Tovmassian et al 2001). This may explain the observed longevity of these systems when compared with N-body simulations which show an isolated compact group evolving into a single merger remnant in only a few orbital times (Barnes 1989).…”

Section: Hcg 58mentioning

confidence: 99%

H I Observations of Five Groups of Galaxies

Freeland

Stilp

Wilcots

2009

The Astronomical Journal

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We present the results of H i observations of five groups of galaxies spanning a range of velocity dispersion and spiral fraction (brightest optical group member in parenthesis): NGC 7582 (NGC 7552), USGC U207 (NGC 2759), USGC U070 (NGC 664), USGC U412 (NGC 3822), USGC U451 (NGC 4065). Neutral intragroup gas is detected in three of the five groups. We present the discovery of a previously uncataloged galaxy in the USGC U070 group at α(2000) = 01 h 45 m 27 s , δ(2000) = +0436 19 , which we are designating FSW J014526.92+043619.1. We compile an H i mass function for the group environment and find that the faint-end slope is consistent with being flat.

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Section: Hcg 58mentioning

confidence: 99%

H I Observations of Five Groups of Galaxies

Freeland

Stilp

Wilcots

2009

The Astronomical Journal

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“…A large number of interacting galaxies are detected among ShCG members [14,[15][16][17][18][19][20][21][22][23]. A large number of interacting galaxies are detected among ShCG members [14,[15][16][17][18][19][20][21][22][23].…”

Section: Observations and Resultsmentioning

confidence: 97%

“…Spectral and photographic observations of a large number of ShCG groups have been made by Tiersch et al [14 and references therein] and Tovmassian et al [15][16][17][18][19][20][21][22][23]. It was shown that the majority of the candidate group members were galaxies with accordant radial velocities (usually < 1000 km s -1 ).…”

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confidence: 99%

Photometric observations of nine Shakhbazian compact groups

Tovmassian

Tiersch²,

Tovmassian

et al. 2010

Astrophysics

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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 oneband. 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.

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“…SHK 191 . This group is the core of Abell cluster A1097 (Tovmassian et al 2005b). The excess in the photometric redshift distribution is highly evident and the RS is clearly defined.…”

Section: Individual Propertiesmentioning

confidence: 99%

“…Furthermore, even though some contamination by stars is indeed present, many of the objects initially suspected to be stars were found to be galaxies. The extensive and detailed studies by Tiersch, (Tiersch 1976; Tiersch et al 1993, 1994, 1995, 1996a, 1996a,b, 2002), Tovmassian (Tovmassian et al 1998, 1999a,b; Tovmassian & Tiersch 2001; Tovmassian et al 2003a,b, 2004, 2005a,b,c, 2006, 2007) and collaborators of a subset of 44 groups have shown that SHK groups form a rather intriguing class of physically bound and moderately compact structures. The spatial densities of SHK groups found in these works, span a wide range: from slightly higher than those of loose groups (10–10 2 gal Mpc −3 ) up to values comparable to the cores of rich clusters or HCGs (10 4 – 10 5 gal Mpc −3 ) for m ≲ 19 mag.…”

Section: Introductionmentioning

confidence: 99%

The properties of the heterogeneous Shakhbazyan groups of galaxies in the SDSS

Capozzi

Filippis

Paolillo

et al. 2009

Monthly Notices of the Royal Astronomical Society

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We present a systematic study of the subsample of Shakhbazyan (SHK) groups covered by the Sloan Digital Sky Survey Data Release 5 (SDSS DR5). SHK groups probe an environment with characteristics which are intermediate between those of loose and very compact groups. Surprisingly, we found that several groups identifying algorithms, e. g. Berlind et al. and Tago et al., miss this type of structures. Using the SDSS DR5 spectroscopic data and the photometric redshifts derived in D'Abrusco et al., we identified possible group members in photometric redshift space and derived, for each group, several individual properties (richness, size, mean photometric redshift, fraction of red galaxies, etc.). We also combined pointed and stacked Rosat All Sky Survey (RASS) data to investigate the X-ray luminosities of these systems. Our study confirms that the majority of groups are physical entities with richness in the range 3-13 galaxies, and properties ranging between those of loose and compact groups. We confirm that SHK groups are richer in early-type galaxies than the surrounding environment and the field, as expected from the morphology - density relation and from the selection of groups of red galaxies. Furthermore, our work supports the existence of two subclasses of structures, the first one being formed by compact and isolated groups and the second formed by extended structures. We suggest that while the first class of objects dwells in less dense regions like the outer parts of clusters or the field, possibly sharing the properties of Hickson Compact Groups, the more extended structures represent a mixture of [core + halo] configurations and cores of rich clusters. X-ray luminosities for SHK groups are generally consistent with these results and with the expectations for the L(X)-sigma(v) relation, but also suggest the velocity dispersions reported in literature are underestimated for some of the richest systems

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Spectroscopy and photometry of ShCG 191 - Abell 1097

Cited by 8 publications

References 25 publications

H I Observations of Five Groups of Galaxies

H I Observations of Five Groups of Galaxies

Photometric observations of nine Shakhbazian compact groups

The properties of the heterogeneous Shakhbazyan groups of galaxies in the SDSS

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