Peculiar velocity of the local group from nearby redshift surveys

Abstract

view Abstract Citations (7) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Peculiar Velocity of the Local Group from Nearby Redshift Surveys Pellegrini, Paulo S. ; da Costa, L. Nicolaci Abstract In this paper we calculate the peculiar velocity induced on the local group by the gravitational field of density fluctuations in the galaxy distribution. The present paper extends the earlier work of Davis and Huchra using a sample which includes the northern and southern Galactic caps. This allows an improved determination of the mean density of galaxies, avoiding the large concentration of objects associated with the Virgo cluster. Here we calculate the peculiar gravity produced by the material within a solid angle, which covers 40% of the sky. We find that the dominant contribution of the southern Galactic cap to the peculiar acceleration arises from low-density regions, producing a net motion toward the northern hemisphere. This effect is even stronger at larger distances, because of a large void at ~ 6000 km s^-1^. Within the framework of a spherical infall model we derive values of {OMEGA} from dynamical estimates. If only infall into Virgo is considered we find that {OMEGA} lies in the range 0.09-0.38 for infall velocities of 220 to 440 km s^-1^, which are smaller than those derived by DH using a shallower southern sample. If a "great attractor" model (Faber and Burstein) is considered {OMEGA} is reduced to 0.03. We also find that the distribution of galaxies within the northern and southern Galactic caps together cannot account for the "local anomaly" discussed by Faber and Burstein. Publication: The Astrophysical Journal Pub Date: July 1990 DOI: 10.1086/168930 Bibcode: 1990ApJ...357..408P Keywords: Gravitational Fields; Milky Way Galaxy; Red Shift; Sky Surveys (Astronomy); Virgo Galactic Cluster; Centaurus Constellation; Elliptical Galaxies; Infrared Astronomy Satellite; Peculiar Galaxies; Astrophysics; GALAXIES: LOCAL GROUP; GALAXIES: REDSHIFTS full text sources ADS | data products SIMBAD (3)