Biology
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348515h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #485.15; Bulletin of the American Astronomical Society, Vol. 41, p.458
Biology
Scientific paper
Diffuse X-ray emission extending over several to tens pc has been reported in many massive star-forming regions. This diffuse component contributes a considerable fraction of the total X-ray emission and shows different spectral characteristics among these regions. Diffuse X-ray emission can be roughly classified into three types: thin-thermal plasma emission with a temperature kT =0.1-1 keV, higher-temperature plasma emission with kT = 2-10 keV, and possibly non-thermal emission with a photon index of 1-1.5. These phenomena are suspected to originate from plasma heating and particle acceleration in strong shocks by fast stellar winds from young OB stars and/or past supernova remnants.
The Carina nebula has the brightest diffuse X-ray emission among known star forming regions, but the origin of the diffuse plasma is unclear. We observed the eastern tip region of the Carina Nebula with the Suzaku XIS for 77 ks to conduct a high-precision spectral study of extended X-ray emission. We also utilized XMM-Newton EPIC data of this region to detect point sources. The XIS detected strong extended X-ray emission from the entire field-of-view with a 0.2-5 keV flux of 0.7-4e-14 erg s-1 arcmin-2. The emission has a blob-like structure that coincides with an ionized gas filament observed in mid-infrared images. The X-ray spectrum of the diffuse emission was represented by a two-temperature plasma model with temperatures of 0.3 and 0.6 keV and an absorption column density of 2e21 cm-1. The X-ray emission showed normal nitrogen-to-oxygen abundance ratios and a high iron-to-oxygen abundance ratio, and the spectrally deduced parameters, such as temperatures and column densities, are common to the diffuse X-ray emission near Eta Car. We discuss the spectral fitting results to constrain the plasma origin.
K.H. is supported by the NASA Astrobiology Program under CAN 03-OSS-02.
Chu Y.-H. Y.-H.
Corcoran Michael F.
Ezoe Yu-ichiro
Gruendl Robert A.
Hamaguchi Kenji
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