Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21620601g&link_type=abstract
American Astronomical Society, AAS Meeting #216, #206.01; Bulletin of the American Astronomical Society, Vol. 41, p.850
Astronomy and Astrophysics
Astronomy
Scientific paper
We present observations of an ultra-cold cloud of interstellar medium toward Leo. New large area, high resolution observations made with the Galactic Arecibo L-band Feed Array HI (GALFA-HI) Survey toward the Leo cloud have allowed us to inspect it with unprecedented sensitivity. Using stellar absorption results of sodium and calcium we can bracket the distance to this cloud to be further than 11 pc, but nearer than 45 pc, with a hint that it may also be in front of Regulus, at 24 pc. The vast extent of this cloud, at 15 degrees tip-to-tail, allows us to determine its 3-space motion using the perspective rotation method. We also present absorption line results to many background stars, which show an startlingly tight correlation between Leo cloud HI column and sodium column, perhaps indicating the Arecibo beam, about 4000 AU at this distance, is getting down to the scale at which the cloud is homogeneous. We also show clear soft X-ray shadowing results, which demonstrate that significant X-rays are generated both in front of and behind the Leo cloud.
Goldston Peek Joshua
Heiles Carl
Meyer Daniel
Peek Kathryn M. G.
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