Polarization of X–ray emission from the Sgr B2 cloud
نویسندگان
چکیده
The Sgr B2 giant molecular cloud is claimed to be an ”X–ray reflection nebula” – the reprocessing site of a powerful flare of the Sgr A* source, occurred few hundred years ago. The shape of the X–ray spectrum and the strength of the iron fluorescent line support this hypothesis. We argue that the most clean test of the origin of X–rays from Sgr B2 would be a detection of polarized emission from this source.
منابع مشابه
Time Variability of the Neutral Iron Lines from the Sgr B 2 Region and its Implication of a Past Outburst of Sgr A ∗
We investigate long-term X-ray behaviors from the Sgr B2 complex using archival data of the X-ray satellites Suzaku, XMM-Newton, Chandra and ASCA. The observed region of the Sgr B2 complex includes two prominent spots in the Fe I K-α line at 6.40 keV, a giant molecular cloud M0.66−0.02 known as the “Sgr B2 cloud” and an unusual X-ray source G0.570−0.018. Although these 6.40 keV spots have spati...
متن کاملTime Variability of the Neutral Iron Lines from the Sagittarius B2 Region and Its Implication of a Past Outburst of Sagittarius A
We investigated long-term X-ray behavior from the Sgr B2 complex using archival data of the X-ray satellites Suzaku, XMM-Newton, Chandra, and ASCA. The observed region of the Sgr B2 complex included two prominent spots in the Fe I K ̨ line at 6.40 keV, a giant molecular cloud, M 0.66 0.02, known as the “Sgr B2 cloud” and an unusual X-ray source, G0.570 0.018. Although these 6.40 keV spots have s...
متن کاملX–ray emission from the giant molecular clouds in the Galactic Center region and the discovery of new X–ray sources
We report the results of X–ray (2–10 keV) observations of the giant molecular clouds Sgr B, Sgr C and Sgr D in the Galactic Center region, together with the discovery of the point-like source SAX J1748.2–2808. The data have been obtained with the MECS instrument on the BeppoSAX satellite. The core of Sgr B2 has an X–ray luminosity of ∼6×10 erg s and its spectrum is characterized by a strong Fe ...
متن کاملX-Ray Observations on the Galactic Center Region
This paper reports on the early Chandra view of the Galactic center (GC) activities. The massive black hole Sgr A is extremely faint, while more bright diffuse X-ray emission is prevailing in the circumnuclear disk. Another high temperature plasma is found in the Sgr A East shell. This may indicate that Sgr A East is a supernova remnant, although no clear X-ray shell is found. A hint of non-the...
متن کاملEquivalent width, shape and proper motion of the iron fluorescent line emission from the molecular clouds as an indicator of the illuminating source X-ray flux history
Observations of the diffuse emission in the 8–22 keV energy range, elongated parallel to the Galactic plane (Sunyaev et al. 1993) and detection of the strong 6.4 keV fluorescent line with ∼ 1 keV equivalent width from some giant molecular clouds (e.g. Sgr B2) in the Galactic Centre region (Koyama 1994) suggest that the neutral matter of these clouds is (or was) illuminated by powerful X-ray rad...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001