NIR Tully-Fisher in the Zone of Avoidance - II. 21 cm H I-line spectra of southern ZOA galaxies
Abstract
High-accuracy H I profiles and linewidths are presented for inclined ((b/a)o < 0.5) spiral galaxies in the southern Zone of Avoidance (ZOA). These galaxies define a sample for use in the determinations of peculiar velocities using the near-infrared Tully-Fisher (TF) relation. The sample is based on the 394 H I-selected galaxies from the Parkes H I Zone of Avoidance survey (HIZOA). Follow-up narrow-band Parkes H I observations were obtained in 2010 and 2015 for 290 galaxies, while for the further 104 galaxies, sufficiently high signal-to-noise (S/N) spectra were available from the original HIZOA data. All 394 spectra are reduced and parametrized in the same systematic way. Five different types of linewidth measurements were derived, and a Bayesian mixture model was used to derive conversion equations between these five widths. Of the selected and measure galaxies, 342 have adequate signal to noise (S/N ≥ 5) for use in TF distance estimation. The average value of the S/N ratio of the sample is 14.7. We present the H I parameters for these galaxies. The sample will allow a more accurate determination of the flow field in the southern ZOA which bisects dynamically important large-scale structures such as Puppis, the Great Attractor, and the Local Void.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 2016
- DOI:
- 10.1093/mnras/stw105
- arXiv:
- arXiv:1601.07162
- Bibcode:
- 2016MNRAS.457.2366S
- Keywords:
-
- galaxies: distances and redshifts;
- galaxies: spiral;
- cosmology: observations;
- large-scale structure of Universe;
- infrared: galaxies;
- radio lines: galaxies;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- Astrophysics - Instrumentation and Methods for Astrophysics
- E-Print:
- 11 pages, 7 figures, 4 tables, accepted for publication in MNRAS