Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atomic Hydrogen and Star Formation in the Bridge/Ring Interacting Galaxy
  Pair NGC 7714/7715 (Arp 284)   We present high spatial resolution 21 cm HI maps of the interacting galaxy
pair NGC 7714/7715. We detect a massive (2 x 10**9 M(sun)) HI bridge connecting
the galaxies that is parallel to but offset from the stellar bridge. A chain of
HII regions traces the gaseous bridge, with H-alpha peaks near but not on the
HI maxima. An HI tidal tail is also detected to the east of the smaller galaxy
NGC 7715, similarly offset from a stellar tail. The strong partial stellar ring
on the eastern side of NGC 7714 has no HI counterpart, but on the opposite side
of NGC 7714 there is a 10**9 M(sun) HI loop 11 kpc in radius. Within the NGC
7714 disk, clumpy HI gas is observed associated with star formation regions.
Redshifted HI absorption is detected towards the starburst nucleus. We compare
the observed morphology and gas kinematics with gas dynamical models in which a
low-mass companion has an off-center prograde collision with the outer disk of
a larger galaxy. These simulations suggest that the bridge in NGC 7714/7715 is
a hybrid between bridges seen in systems like M51 and the purely gaseous
`splash' bridges found in ring galaxies like the Cartwheel. The offset between
the stars and gas in the bridge may be due to dissipative cloud-cloud
collisions occuring during the impact of the two gaseous disks.

29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat