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Chandra X-ray Spectroscopic Imaging of Sgr A* and the Central Parsec of the Galaxy | | F. K. Baganoff
; Y. Maeda
; M. Morris
; M. W. Bautz
; W. N. Brandt
; W. Cui
; J. P. Doty
; E. D. Feigelson
; G. P. Garmire
; S. H. Pravdo
; G. R. Ricker
; L. K. Townsley
; | | Date: |
8 Feb 2001 | | Journal: | Astrophys.J. 591 (2003) 891-915 | | Subject: | astro-ph | | Affiliation: | 1,4), J. P. Doty , E. D. Feigelson , G. P. Garmire , S. H. Pravdo , G. R. Ricker , and L. K. Townsley ( MIT, Penn State Univ., UCLA, Purdue Univ., JPL | | Abstract: | We present results of our Chandra observation with the ACIS-I instrument centered on the position of Sagittarius A* (Sgr A*), the compact nonthermal radio source associated with the massive black hole (MBH) at the dynamical center of the Milky Way Galaxy. We have obtained the first high-spatial-resolution (~1 arcsec), hard X-ray (0.5-7 keV) image of the central 40 pc (17 arcmin) of the Galaxy and have discovered an X-ray source, CXOGC J174540.0-290027, coincident with the radio position of Sgr A* to within 0.35 arcsec, corresponding to a maximum projected distance of 16 light-days for an assumed distance to the center of the Galaxy of 8.0 kpc. We received 222 +/-17 (1 sigma) net counts from the source in 40.3 ks. Due to the low number of counts, the spectrum is well fit either by an absorbed power-law model with photon index Gamma = 2.7 (1.8-4.0) and column density NH = (9.8 [6.8-14.2]) x 10^22 cm^-2 (90% confidence interval) or by an absorbed optically thin thermal plasma model with kT = 1.9 (1.4-2.8) keV and NH = (11.5 [8.4-15.9]) x 10^22 cm^-2. Using the power-law model, the measured (absorbed) flux in the 2-10 keV band is (1.3 [1.1-1.7]) x 10^-13 ergs cm^-2 s^-1, and the absorption-corrected luminosity is (2.4 [1.8-5.4]) x 10^33 ergs s^-1. We also briefly discuss the complex structure of the X-ray emission from the Sgr A radio complex and along the Galactic plane and present morphological evidence that Sgr A* and Sgr A West lie within the hot plasma in the central cavity of Sgr A East. | | Source: | arXiv, astro-ph/0102151 | | Services: | Forum | Review | PDF | Favorites | |
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