COSMICFLOWS-2: I-BAND LUMINOSITY-H I LINEWIDTH CALIBRATION

Journal Article · Tue Apr 10 00:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/749/1/78· OSTI ID:22020444

Tully, R Brent; Courtois, Helene M ^[1]

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1. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)

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 H{sub 0} {approx} 75 km s{sup -1} Mpc{sup -1}. Distances determined using the luminosity-linewidth calibration will contribute to the distance compendium Cosmicflows-2.

• OSTI ID: 22020444
• Journal Information: Astrophysical Journal, Vol. 749, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
CALIBRATION
COSMOLOGY
GALAXIES
HYDROGEN
LUMINOSITY
PHOTOMETRY
RED SHIFT
ROTATION