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2005AJ....129.1832G - Astron. J., 129, 1832-1848 (2005/April-0)
Small-scale systems of galaxies. II. Properties of the NGC 4756 group of galaxies.
GRUETZBAUCH R., KELM B., FOCARDI P., TRINCHIERI G., RAMPAZZO R. and ZEILINGER W.W.
Abstract (from CDS):
The nine member galaxies are located in the core part of the NGC 4756 group (a strip ~300 kpc in diameter, H0=70 km/s/Mpc), which has a very loose configuration. The central part of the NGC 4756 group contains a significant fraction of early-type galaxies. Three new group members with previously unknown systemic velocities are identified, one of which is type dE. At about 7'.5 southwest of NGC 4756 a substructure of the group is detected, including IC 829, MCG -2-33-35, MCG -2-33-36, and MCG -2-33-38, that meets the Hickson criteria for being a compact group. Most of the galaxies in this substructure show interaction signatures. We do not detect apparent fine structure and signatures of recent interaction events in the early-type galaxy population, with the exception of a strong dust lane in the elliptical galaxy MCG -2-33-38. However, this galaxy displays signatures of nuclear activity. Strong [O III], [N II], and [S II] line emission, combined with comparatively weak but broad Hα emission, suggests an intermediate Seyfert type classification. Although the area is heavily contaminated by the background cluster A1631, X-ray data suggest the presence of a hot intergalactic medium related to the detected X-ray emission of the group. The present results are discussed in the context of group evolution.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Distances and Redshifts - Galaxies: Interactions - Galaxies: Photometry - Techniques: Spectroscopic
VizieR on-line data: <Available at CDS (J/AJ/129/1832): table6.dat table7.dat table8.dat>
Nomenclature: Fig.1, Table 3: [GKF2005] New N (Nos 1-2). Tables 6, 7: [GKF2005] NNNNN N=15+99 among (Nos 2132-20587).
Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.
Simbad objects: 45
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