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Title: HIGH RESOLUTION X-RAY SPECTROSCOPY OF THE LOCAL HOT GAS ALONG THE 3C 273 SIGHTLINE

X-ray observations of highly ionized metal absorption lines at z = 0 provide critical information on the hot gas distribution in and around the Milky Way. We present a study of more than 10 yr of Chandra and XMM-Newton observations of 3C 273, one of the brightest extragalactic X-ray sources. Compared with previous works, we obtain much tighter constraints on the physical properties of the X-ray absorber. We also find a large, non-thermal velocity at ∼100-150 km s{sup –1}, the main reason for the higher line equivalent width when compared with other sightlines. Using joint analysis with X-ray emission and ultraviolet observations, we derive a size of 5-15 kpc and a temperature of (1.5-1.8) × 10{sup 6} K for the X-ray absorber. The 3C 273 sightline passes through a number of Galactic structures, including radio loops I and IV, the North Polar Spur, and the neighborhood of the newly discovered ''Fermi bubbles''. We argue that the X-ray absorber is unlikely to be associated with the nearby radio loops I and IV; however, the non-thermal velocity can be naturally explained as the result of the expansion of the ''Fermi bubbles''. Our data imply a shock-expansion velocity of 200-300 km s{sup –1}. Our study indicates a likely complex environmentmore » for the production of the Galactic X-ray absorbers along different sightlines, and highlights the significance of probing galactic feedback with high resolution X-ray spectroscopy.« less
Authors:
;  [1]
  1. Department of Astronomy and Institute for Theoretical Physics and Astrophysics, Xiamen University, 422 Siming South Road, Siming, Xiamen, Fujian (China)
Publication Date:
OSTI Identifier:
22365895
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 785; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; COMPARATIVE EVALUATIONS; FEEDBACK; METALS; MILKY WAY; PROBES; QUASARS; RESOLUTION; ULTRAVIOLET RADIATION; VELOCITY; X RADIATION; X-RAY SPECTROSCOPY