# Cosmic Flows : Green Bank and Parkes HI observations

1 Cosmologie Observationnelle
IPNL - Institut de Physique Nucléaire de Lyon
Abstract : The neutral hydrogen properties of 1,822 galaxies are being studied with the Green Bank 100m and the Parkes 64m telescopes as part of the `Cosmic Flows' program. Observed parameters include systemic velocities, profile line widths, and fluxes. The line width information can be combined with optical and infrared photometry to obtain distances. The 1,822 HI observations complement an inventory of archives. All told, HI line width information is available for almost all of five samples: (i) luminosity--line width correlation calibrators, (ii) zero-point calibrators for the supernova Ia scale, (iii) a dense local sample of spiral galaxies with M_{Ks} < -21 within 3,000~km/s, (iv) a sparser sample of 60~$\mu$m selected galaxies within 6,000~km/s that provides all-sky coverage of our extended supercluster complex, and (v) an even sparser sample of flat galaxies, extreme edge-on spirals, extending in a volume out to 12,000~km/s. The HI information for 13,941 galaxies, whether from the archives or acquired as part of the Cosmic Flows observational program, is uniformly re-measured and made available through the Extragalactic Distance Database web site.
Document type :
Journal articles
Domain :

http://hal.in2p3.fr/in2p3-00558146
Contributor : Sylvie Flores <>
Submitted on : Friday, January 21, 2011 - 10:23:21 AM
Last modification on : Tuesday, November 19, 2019 - 2:43:07 AM

### Citation

H.M. Courtois, R. Brent Tully, D. I. Makarov, S. Mitronova, B. Koribalski, et al.. Cosmic Flows : Green Bank and Parkes HI observations. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2011, 414, pp.2005-2016. ⟨10.1111/j.1365-2966.2011.18515.x⟩. ⟨in2p3-00558146⟩

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