X-ray emission from the giant molecular clouds in the Galactic Center region and the discovery of new X-ray sources

Abstract

We report the results of X-ray (2-10 keV) observations of the giant molecular clouds SgrB, SgrC and SgrD in the Galactic Center region, together with the discovery of the point-like source SAXJ1748.2-2808. The data have been obtained with the MECS instrument on the BeppoSAX satellite. The core of SgrB2 has an X-ray luminosity of 6x10^34 erg/s and its spectrum is characterized by a strong Fe emission line at 6.5 keV with an equivalent width of 2 keV. Faint diffuse X-ray emission is detected from SgrC and from the SNR G1.05-0.15 (SgrD). A new, unresolved source with a strong Fe line has been discovered in the SgrD region. This source, SAXJ1748.2-2808, is probably associated with a SiO and OH maser source at the Galactic Center distance. If so, its luminosity is 10^34 erg/s. We propose that the X-ray emission from SAX J1748.2-2808 is produced either by protostars or by a giant molecular cloud core. Emission from sources similar to SAX J1748.2-2808 could have an impact on the expected contribution on the observed Fe line emission from the Galactic ridge.

12 pages, 8 figures, accepted for publication in Astronomy & Astrophysics Main Journal

References in corpus (1)

• A catalogue of soft X-ray sources in the galactic center region

Cited by in corpus (14)

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• Polarization of X-ray emission from the Sgr B2 cloud
• Observational evidence for gravitationally trapped massive axion(-like) particles
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• An X-ray survey of the central molecular zone: variability of the Fe Ka emission line
• Prospects of 3D mapping of the Galactic Centre clouds with X-ray polarimetry
• Unveiling the nature of the highly absorbed X-ray source SAXJ1748.2-2808 with XMM-Newton
• Discoveries of 3 K-shell Lines of Iron and a Coherent Pulsation of 593-sec from SAX J1748.2-2808
• 25 years of XMM-Newton observations of the Sgr A complex: 3D distribution and internal structure of the clouds
• Imaging of Four Galactic Supernovae Remnants in the Mid-Infrared, and their Interaction with the Interstellar Medium
• Timing analysis of a sample of five cataclysmic variable candidates observed by the XMM-Newton satellite