Extra-planar gas in the spiral galaxy NGC 4559

Details Extra-planar gas in the spiral galaxy NGC 4559 Extra-planar gas in the spiral galaxy NGC 4559

2005-04-25

arxiv.org/abs/astro-ph/0504534v1

Astronomy and Astrophysics

Astrophysics

17 pages, 10 figures. Accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20042395

We present 21-cm line observations of the spiral galaxy NGC 4559, made with the Westerbork Synthesis Radio Telescope. We have used them to study the HI distribution and kinematics, the relative amount and distribution of luminous and dark matter in this galaxy and, in particular, the presence of extra-planar gas. Our data do reveal the presence of such a component, in the form of a thick disk, with a mass of 5.9 x 10^8 Mo (one tenth of the total HI mass) and a mean rotation velocity 25-50 km/s lower than that of the thin disk. The extra-planar gas may be the result of galactic fountains but accretion from the IGM cannot be ruled out. With this study we confirm that lagging, thick HI layers are likely to be common in spiral galaxies.

Affiliated with

Also associated with

No associations

Rating

Extra-planar gas in the spiral galaxy NGC 4559 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 Extra-planar gas in the spiral galaxy NGC 4559, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extra-planar gas in the spiral galaxy NGC 4559 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-468993