VLA Imaging of Virgo Spirals in Atomic Gas (VIVA). I. The Atlas and the H I Properties

Details VLA Imaging of Virgo Spirals in Atomic Gas (VIVA). I. The Atlas and the H I Properties VLA Imaging of Virgo Spirals in Atomic Gas (VIVA). I. The Atlas and the H I Properties

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aj....138.1741c&link_type=abstract

The Astronomical Journal, Volume 138, Issue 6, pp. 1741-1816 (2009).

Astronomy and Astrophysics

Astronomy

59

Galaxies: Clusters: General, Galaxies: Evolution, Galaxies: Interactions, Galaxies: Kinematics And Dynamics

Scientific paper

We present the results of a new VLA H I Imaging survey of Virgo galaxies, the VLA Imaging survey of Virgo galaxies in Atomic gas (VIVA). The survey includes high-resolution H I data of 53 carefully selected late type galaxies (48 spirals and five irregular systems). The goal is to study environmental effects on H I gas properties of cluster galaxies to understand which physical mechanisms affect galaxy evolution in different density regions, and to establish how far out the impact of the cluster reaches. As a dynamically young cluster, Virgo contains examples of galaxies experiencing a variety of environmental effects. Its nearness allows us to study each galaxy in great detail. We have selected Virgo galaxies with a range of star formation properties in low to high density regions (at projected distances from M87, d 87 = 0.3-3.3 Mpc). Contrary to previous studies, more than half of the galaxies in the sample (~60%) are fainter than 12 mag in BT . Overall, the selected galaxies represent the late type Virgo galaxies (S0/a to Sd/Irr) down to mp <~ 14.6 fairly well in morphological type, systemic velocity, subcluster membership, H I mass, and deficiency. The H I observations were done in C short (CS) configuration of the VLA radio telescope, with a typical spatial resolution of 15'' and a column density sensitivity of ≈3-5 × 1019 cm-2 in 3σ per 10 km s-1 channel. The survey was supplemented with data of comparable quality from the NRAO archive, taken in CS or C configuration. In this paper, we present H I channel maps, total intensity maps, velocity fields, velocity dispersions, global/radial profiles, position-velocity diagrams and overlays of H I/1.4 GHz continuum maps on the optical images. We also present H I properties such as total flux (S H I ), H I mass (M H I ), linewidths (W 20 and W 50), velocity (V H I ), deficiency (def H I ), and size (D eff H I and D iso H I ), and describe the H I morphology and kinematics of individual galaxies in detail. The survey has revealed details of H I features that were never seen before. In this paper, we briefly discuss differences in typical H I morphology for galaxies in regions of different galaxy densities. We confirm that galaxies near the cluster core (d 87 <~ 0.5 Mpc) have H I disks that are smaller compared to their stellar disks (D H I /D 25 < 0.5). Most of these galaxies in the core also show gas displaced from the disk, which is either currently being stripped or falling back after a stripping event. At intermediate distances (d 87 ~ 1 Mpc) from the center, we find a remarkable number of galaxies with long one-sided H I tails pointing away from M87. In a previous letter, we argue that these galaxies are recent arrivals, falling into the Virgo core for the first time. In the outskirts, we find many gas-rich galaxies, with gas disks extending far beyond their optical disks. Interestingly, we also find some galaxies with H I disks that are smaller compared to their stellar disks at large clustercentric distances.

Affiliated with

Also associated with

No associations

Rating

VLA Imaging of Virgo Spirals in Atomic Gas (VIVA). I. The Atlas and the H I Properties 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 VLA Imaging of Virgo Spirals in Atomic Gas (VIVA). I. The Atlas and the H I Properties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and VLA Imaging of Virgo Spirals in Atomic Gas (VIVA). I. The Atlas and the H I Properties will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1882321