Compact groups in the DPOSS II survey








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The survey

The survey has been extracted from the DPOSS II digitized plates, with an automatic algorithm,

employing the following criteria:

Richness: n ≥ 4, where n is the number of galaxies within 2 mag of the brightest group member;

Isolation: Risol ≥ 3 Rgr, where Risol is the distance from the center of the circle to the nearest

nonmember galaxy within 0.5 mag of the faintest group member

Compactness: μgr < μlimit, where μgr is the mean surface brightness (mag/arcsec2)

within the circle of radius Rgr and μlimit = 24.0 in r band

Magnitude of the brightest galaxy: 16.0 ≤ r ≤ 17.0



This has resulted in 459 candidate compact groups over 6200 sq. degrees, with 260 visible from the

southern emisphere (δ< +20 degrees). The average expected redshift is z ~ 0.2: a spectroscopic follow-up

survey has been completed on the NTT telescope and EMMI detector to identify the bound groups.

The main goal of the spectroscopic follow-up is to look for signs of

evolution in the groups and to classify their galaxy population.

Up to now over 140 groups have been observed.

People

button E.Pompei (P.I.)

European Southern Observatory

Alonso de Cordova 3107 - Vitacura

Santiago de Chile

CHILE

epompei@eso.org


buttonA. Iovino

Osservatorio astronomico di Brera-Merate

20100 Milano

Italia

iovino@brera.astro.mi.it


button R. R. de Carvalho

Instituto Nacional de Pesquisas Espaciais, INPE, Divisao Astrofisica-DAS

Av. dos Astronautas 1.758, Jd. Granja

Sao Jose' dos Campos, SP 12227-010

Brazil

rrdecarvalho2008@gmail.com



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Publications from the survey

A. Iovino, R. R. de Carvalho et al. A new sample of distant compact groups from DPOSS II survey AJ, 125, 600 2003
A. Iovino Baryons in DM halos (SISSA proceeding) Baryons in DM halos (SISSA proceeding), p.30 2004
R.R. de Carvalho, T.S. Goncalves,A. Iovino et al. A catalog of distant compact groups using the DPOSS II survey AJ, 130, 425 2005
E. Pompei, A. Iovino, R.R de Carvalho DPOSS II compact groups survey: first spectroscopically confirmed candidates A&A, 445,857 2006
E. Pompei DPOSS II Compact Groups Survey: First Results The Fabulous Destiny of Galaxies: Bridging Past and Present. Marseille International Cosmology Conference, p. 559 2006
E. Pompei, A. Iovino, R.R. de Carvalho DPOSS II compact groups: the EMMI/NTT survey ESO Astrophysics Symposia, pp.85-90 2007
E. Pompei, A. Iovino Compact Groups of Galaxies: Small, Dense, and Elusive ASP, 421, 279 2010
E. Pompei, A. Iovino The DPOSSII distant compact groups of galaxies: evidence of cluster-induced group evolution Galaxy Clusters as Giant Cosmic Laboratories, XMM-Newton Syposium, p. 46 2012
E. Pompei, A. Iovino The DPOSS II distant compact groups survey: the EMMI/NTT spectroscopic sample A&A, 539,106 2012




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Survey status

Catalog and group information

DATA BASE

ADS Abstract Service, E.S.O. mirror site

Nasa Extragalactic Database

Babbage Main Page

Babbage title/author search for astro-ph


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