H I Structure and Topology of the Galaxy Revealed by the I-GALFA H I 21-cm Line Survey

Details H I Structure and Topology of the Galaxy Revealed by the I-GALFA H I 21-cm Line Survey H I Structure and Topology of the Galaxy Revealed by the I-GALFA H I 21-cm Line Survey

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812920k&link_type=abstract

American Astronomical Society, AAS Meeting #218, #129.20; Bulletin of the American Astronomical Society, Vol. 43, 2011

Statistics

Scientific paper

The I-GALFA survey mapping all the H I in the inner Galactic disk visible to the Arecibo 305m telescope within 10 degrees of the Galactic plane (longitudes of 32 to 77 degrees at b = 0) completed observations in 2009 September and will soon be made publicly available. The high (3.4 arcmin) resolution and tremendous sensitivity of the survey offer a great opportunity to observe the fine details of H I both in the inner and in the far outer Galaxy. The reduced HI column density maps show that the HI structure is highly filamentary and clumpy, pervaded by shell-like structures, vertical filaments, and small clumps. By inspecting individual maps, we have found 36 shell candidates of angular sizes ranging from 0.4 to 12 degrees, half of which appear to be expanding. In order to characterize the filamentary/clumpy morphology of the HI structure, we have carried out statistical analyses of selected areas representing the spiral arms in the inner and outer Galaxy. Genus statistics that can distinguish the ``meatball'' and ``swiss-cheese'' topologies show that the HI topology is clump-like in most regions. The two-dimensional Fourier analysis further shows the HI structures are filamentary and mainly parallel to the plane in the outer Galaxy. We also examine the level-crossing statistics, the results of which are described in detail in an accompanying poster by Park et al.

Affiliated with

Also associated with

No associations

Rating

H I Structure and Topology of the Galaxy Revealed by the I-GALFA H I 21-cm Line Survey 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 H I Structure and Topology of the Galaxy Revealed by the I-GALFA H I 21-cm Line Survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and H I Structure and Topology of the Galaxy Revealed by the I-GALFA H I 21-cm Line Survey will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1738094