Another Look at the Abell Cluster Inertial Frame Bulk Flow

Details Another Look at the Abell Cluster Inertial Frame Bulk Flow Another Look at the Abell Cluster Inertial Frame Bulk Flow

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...459...27g&link_type=abstract

Astrophysical Journal v.459, p.27

Astronomy and Astrophysics

Astronomy

10

Cosmology: Observations, Galaxies: Distances And Redshifts, Galaxies: Fundamental Parameters, Galaxies: Photometry, Cosmology: Large-Scale Structure Of Universe

Scientific paper

Recently, use has been made of the relationship between absolute magnitude and galaxy structure for the first-ranked galaxies in Abell clusters out to 15,000 km s 1, in a determination of a large bulk flow for this volume (see the recent work of Lauer & Postman). The technique uses the logarithmic slope of the galaxy luminosity profile, at 10 h -1 kpc, parameterized by alpha, as an indicator of the galactic structure. In examining this M-alpha relation, it is shown to be similar to a magnitude-radius relation. Fitting a de Vaucouleurs R^{114 }law profile to the Abell brightest cluster galaxy (BCG) sample of Lauer & Postman, the M-log .t'e relationship is used to test for Local Group motion with respect to the Abell cluster inertial reference frame (ACIF), defined by the BCG. A motion of 459 + 371 km s 1 toward 1 = 2030, b = 290 (l 320) is obtained when using the entire sample of 119 BCGs. This differs from the Local Group velocity inferred by the cosmic microwave background dipole, implying that the ACIF has a bulk flow of 738 + 158 km s - I toward 1 = 3300, b = +450 (l 260). Both vectors are consistent with those derived by Lauer & Postman. The BCGs studied are shown to be a very homogeneous set of objects, with their radial size corrected magnitudes having a scatter of only 0.26 mag, making them a powerful tool in measuring galaxy distances and peculiar velocities. Using accurate CCD photometry, the galaxy light profiles are seen to be well fitted by an R^{1 4 }law. The slope of the mu -log re relation, for the BCG, is found to have a value of 2.87. Furthermore, there is negligible evidence for curvature in this bright portion of the fundamental plane. It is shown that use of the M-alpha relation is preferred over the M-log re relation in this type of analysis of bulk flow motion, as it results in considerably smaller error bars.

Affiliated with

Also associated with

No associations

Rating

Another Look at the Abell Cluster Inertial Frame Bulk Flow does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Another Look at the Abell Cluster Inertial Frame Bulk Flow, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Another Look at the Abell Cluster Inertial Frame Bulk Flow will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1644080