Diffuse Far-ultraviolet Observation of the Lupus Loop Region

Details Diffuse Far-ultraviolet Observation of the Lupus Loop Region Diffuse Far-ultraviolet Observation of the Lupus Loop Region

2006-04-21

arxiv.org/abs/astro-ph/0604454v1

Astrophys.J.644:L189-L192,2006

Astronomy and Astrophysics

Astrophysics

Accepted in ApJL, 4 pages, 3 figures

Scientific paper

10.1086/505263

Diffuse far-ultraviolet (FUV) emissions from the Lupus Loop region (SNR 330.0+15.0) have been observed with Spectroscopy of Plasma Evolution from Astrophysical Radiation (SPEAR), also known as Far-ultraviolet IMaging Spectrograph (FIMS). We have detected several important ionic lines, including Si II*, C IV, and N IV], which characterize the warm, hot ionized gas in this region. The spatial variations in the line intensities of Si II* and C IV have also been studied in comparison with X-ray and dust observations. The result shows that they originate from the interface between the hot gas seen in the X-ray and the cooler H I shell with which dust is associated. The interface is rather diffuse, and the gases with different temperatures seem to co-exist in this region. A shock may exist upfront in the interface, but its velocity should be very small as no shock-related distinguished feature is seen in Ha.

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