Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.9706c&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #97.06; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of a targeted survey undertaken with the 305m Arecibo radiotelescope to detect HI-line emission from disk galaxies at redshift z>0.16. The targets for the observations were extracted from the Sloan Digital Sky Survey database according to their redshift, optical emission line strength, inclination, disk morphology, and relative isolation (to minimize confusion within the beam). We obtained HI profiles of adequate quality for velocity width measurement for 20 galaxies in the redshift range 0.17-0.25. In particular, this sample includes the highest redshift detections of HI emission from individual, normal galaxies to date. The average total integration time varied between 2 and 6 hours, primarily depending on the redshift of the target. The HI mass of these galaxies is of the order of a few 1010 solar masses. We are using this sample to study the evolution of the zero point of the Tully-Fisher relation (TFR) for galaxies at intermediate redshifts. Compared to optical widths, HI measurements sample a larger fraction of the disks, where the rotation curves are typically flat, and are not affected by slit smearing and misalignment or by aperture effects. Thus, in contrast to studies based on optical spectroscopy, this data set allows us to perform a direct comparison with the local TFR that is technique independent. Preliminary results of this analysis will be presented.
The Arecibo Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under a cooperative agreement with the National Science Foundation.
Catinella Barbara
Connolly Andrew J.
Gardner Jeffrey P.
Giovanelli Riccardo
Haynes Martha P.
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