Cosmicflows-2: I-band Luminosity - HI Linewidth Calibration

Details Cosmicflows-2: I-band Luminosity - HI Linewidth Calibration Cosmicflows-2: I-band Luminosity - HI Linewidth Calibration

2012-02-15

arxiv.org/abs/1202.3191v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for publication in The Astrophysical Journal, 27 pages, 18 figures

Scientific paper

In order to measure distances with minimal systematics using the correlation between galaxy luminosities and rotation rates it is necessary to adhere to a strict and tested recipe. We now derive a measure of rotation from a new characterization of the width of a neutral Hydrogen line profile. Additionally, new photometry and zero point calibration data are available. Particularly the introduction of a new linewidth parameter necessitates the reconstruction and absolute calibration of the luminosity-linewidth template. The slope of the new template is set by 267 galaxies in 13 clusters. The zero point is set by 36 galaxies with Cepheid or Tip of the Red Giant Branch distances. Tentatively, we determine H0 = 75 km s-1 Mpc-1. Distances determined using the luminosity-linewidth calibration will contribute to the distance compendium Cosmicflows-2.

Affiliated with

Also associated with

No associations

Rating

Cosmicflows-2: I-band Luminosity - HI Linewidth Calibration 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 Cosmicflows-2: I-band Luminosity - HI Linewidth Calibration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmicflows-2: I-band Luminosity - HI Linewidth Calibration will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-556225