Imaging of Diffuse FUV Emission from the Gum Nebula with SPEAR

Details Imaging of Diffuse FUV Emission from the Gum Nebula with SPEAR Imaging of Diffuse FUV Emission from the Gum Nebula with SPEAR

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1701n&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #17.01; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We present imaging observation of diffuse FUV emission lines emanating from the Gum Nebula, a large ionized region 18 degrees in radius centered around (l,b)=(258, -2). Observations covering about 50% of the Gum Nebula have been obtained with the SPEAR (FIMS) instrument, flown aboard the STSAT-1 satellite. Our understanding of this nebula and its origins is incomplete; however, past observations have shown that it has characteristics of an H II region, of a wind-blown bubble, and of an old supernova remnant. We report detection (> 2-sigma) of C IV (1550 Å) and Si II (1533 Å) emission from the Gum Nebula. Emission is detected on angular scales of 4 degrees and is localized, rather than being uniform across the Nebula. The C IV emission directly traces high ionization, intermediate temperature gas, while Si II traces lower ionization gas. By comparing the observations with photoionization and shock model predictions, we determine which of these processes dominates at different locations. SPEAR (FIMS) is supported by NASA grant NAG5-5355 and flies on the STSAT-1 Mission, supported by the Korea Ministry of Science and Technology.

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