Far-Ultraviolet Observation of the Draco Cloud with FIMS/SPEAR

Details Far-Ultraviolet Observation of the Draco Cloud with FIMS/SPEAR Far-Ultraviolet Observation of the Draco Cloud with FIMS/SPEAR

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...700..155p&link_type=abstract

The Astrophysical Journal, Volume 700, Issue 1, pp. 155-160 (2009).

Astronomy and Astrophysics

Astronomy

4

Ism: Individual: Draco, Ism: Lines And Bands, Ultraviolet: Ism

Scientific paper

We report an observation of the Draco cloud region using the Far-ultraviolet IMaging Spectrograph (FIMS/SPEAR). The spectra show important ionic lines, such as C IV λλ1548, 1551, Si IV+O IV] λ1394, Si II* λ1533, and Al II λ1671, indicating the existence of hot and warm interstellar gases toward the region. The map of the continuum is generally in accord with the infrared map, which indicates far-ultraviolet continuum is mostly the starlight scattered off by the dust grains in the Draco cloud. Enhanced C IV emission is seen inside the Draco cloud region and attributed to the turbulent mixing of the interacting cold and warm/hot media. This interpretation is supported by the detection of O III] λ1661 emission line and the Hα feature in this region. We found slightly fainter C IV and far brighter Si II* emissions covering the rest of the region outside the Draco cloud, in agreement with previous observations of Galactic halos. Additionally, we also found that the molecular hydrogen fluorescence map is consistent with the morphology of the atomic neutral hydrogen and dust emission of the Draco cloud, direct evidence supporting the notion that substantial amounts of hydrogen nuclei exist in molecular form in the cloud.

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