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arXiv:astro-ph/9610130 (astro-ph)
[Submitted on 16 Oct 1996]

Title:A Test of the Lauer--Postman Bulk Flow

Authors:Riccardo Giovanelli (1), Martha P. Haynes (1), Gary Wegner (2), Luiz N. da Costa (3), Wolfram Freudling (3), John J. Salzer (4) ((1) Cornell University, (2) Dartmouth College, (3) European Southern Observatory, (4) Wesleyan University)
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Abstract: We use Tully--Fisher distances for a sample of field late spiral galaxies to test the Lauer and Postman (1994; hereinafter LP) result suggestive of a bulk flow with respect to the Cosmic Microwave Background reference frame, of amplitude of +689 km/s in the direction l=343, b=+52. A total of 432 galaxies are used, subdivided between two cones, of 30deg semiaperture each and pointed respectively toward the apex and antapex of the LP motion. The peculiar velocities in the two data sets are inconsistent with a bulk flow of the amplitude claimed by LP. When combined in opposition, the peculiar velocity medians in shells of constant redshift width are never larger than half the amplitude of the LP bulk flow. Out to 5000 km/s the median bulk velocity in the LP apex--antapex cones is about 200 km/s or less, dropping to a value indistinguishable from zero beyond that distance. It can be excluded that field spiral galaxies within 8000 km/s partake of a bulk flow of the amplitude and direction reported by LP.
Comments: 9 pages including figures embedded in text; uses AAS LaTex and psfig
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/9610130
  (or arXiv:astro-ph/9610130v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/9610130
Journal reference: ApJ 464, L99
Related DOI: https://doi.org/10.1086/310107

Submission history

From: Riccardo Giovanelli [view email]
[v1] Wed, 16 Oct 1996 18:48:34 UTC (49 KB)
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