Groups of galaxies. I. Identification principles

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · Astrophysics (Engl. Transl.); (United States)

DOI:https://doi.org/10.1007/BF01004061· OSTI ID:6018241

Magtesyan, A P

Huchra and Geller proposed a new method for identifying groups of galaxies. One begins by choosing an arbitrary galaxy from a list restricted by a certain apparent magnitude and with complete data on the radial velocities. In the neighborhood of this galaxy one then seeks neighbors in accordance with the following criteria: the radial velocities and apparent magnitudes of the first and second galaxy, the angular separation, the projection of the linear distance between the two galaxies onto the celestial sphere, and Hubble's constant. Neighbors that satisfy these criteria are assumed to be members of a group. One then considers the neighborhoods of the members of a group already chosen in this manner and finds new neighbors by the same method. This process is continued until all members of the group have been found. The aim of this note is to find physically more justified criteria for identifying groups of galaxies in the hope of eliminating or at least significantly ameliorating the noted shortcomings while retaining the main advantages of Huchra and Geller's method.

• OSTI ID: 6018241
• Journal Information: Astrophysics (Engl. Transl.); (United States), Journal Name: Astrophysics (Engl. Transl.); (United States) Vol. 28:2; ISSN ATPYA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CLASSIFICATION
GALACTIC EVOLUTION
GALAXIES
GALAXY CLUSTERS
GRAVITATIONAL FIELDS
LUMINOSITY
MORPHOLOGY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIAL VELOCITY
REMOTE SENSING
VELOCITY