Hard X-Ray Emission from Massive Star Clusters in a Giant Molecular Cloud NGC 6334

Details Hard X-Ray Emission from Massive Star Clusters in a Giant Molecular Cloud NGC 6334 Hard X-Ray Emission from Massive Star Clusters in a Giant Molecular Cloud NGC 6334

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52l..31s&link_type=abstract

Publications of the Astronomical Society of Japan, v.52, p.L31-L35.

Astronomy and Astrophysics

Astronomy

14

Ism: H Ii Regions, Stars: Early-Type, X-Rays: Ism

Scientific paper

We report on detection with the ASCA satellite of hard X-rays from far infrared (FIR) star clusters in the giant molecular cloud (GMC) cores of the NGC 6334 star-forming region. Five FIR cores are visible in the hard X-ray band (E> 2 keV), while in the soft X-ray band (E< 2 keV) the emission is absorbed, except for one core. The observed spectra can be fitted with thermal emission from a hot plasma, whose temperature of ~ 9 keV is significantly higher than those reported of low-mass Class I pre-main-sequence stars (PMSs) ( ~ 3 keV) in nearby dark clouds and those of OB-type main-sequence stars ( ~ 1 keV). The X-ray luminosity of each core is typically 1033 erg s-1 or 103 times that of typical low-mass PMSs. The observed hard X-rays may be emitted from young massive stars and loss-mass/intermediate-mass PMSs in the FIR cores. The observed hard X-ray flux can ionize the inner part (r ~ 0.3 pc) of the GMC cores at a rate comparable to that by cosmic-ray particles. If the L_X/M ratio of ~ 10-5 LO /MO observed in NGC 6334 is typical among GMCs, the X-ray flux from all GMCs in the Galaxy ( ~ 109 MO ) can account for about 20% of the diffuse galactic ridge hard X-ray emission.

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