The North Polar Spur and Aquila Rift

Abstract

Soft X-ray intensity at 0.89 keV along the North Polar Spur is shown to follow the extinction law due to the interstellar gas in the Aquila Rift by analyzing the ROSAT archival data, which proves that the NPS is located behind the rift. The Aquila-Serpens molecular clouds, where the X-ray optical depth exceeds unity, are shown to have a mean LSR velocity of v=7.33 +/- 1.94 km/s, corresponding to a kinematic distance of r=0.642 +/- 0.174 kpc. Assuming a shell structure, a lower limit of the distance to NPS is derived to be 1.01 +/- 0.25 kpc, with the shell center being located farther than 1.1 kpc. Based on the distance estimation, we argue that the NPS is a galactic halo object.

arXiv comment8 pages, 11 figures, 3 tables, accepted for MNRAS, Full resolution pdf at http://www.ioa.s.u-tokyo.ac.jp/~sofue/papers/GCE/

References in corpus (17)

• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• The Milky Way in Molecular Clouds: A New Complete CO Survey
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• The Large-scale Bipolar Wind in the Galactic Center
• The COBE Diffuse Infrared Background Experiment Search for the Cosmic Infrared Background: III. Separation of Galactic Emission from the Infrared Sky Brightness
• VLBA determination of the distance to nearby star-forming regions IV. A preliminary distance to the proto-Herbig AeBe star EC95 in the Serpens Core
• A New Model For The Loop-I (The North Polar Spur) Region
• Suzaku observations of the diffuse x-ray emission across the fermi bubbles' edges
• Bipolar-Hyper-Shell Galactic Center Statrburst Model: Further Evidence from ROSAT Data and New Radio and X-ray Simulations
• Interstellar extinction in the direction of the Aquila Rift
• Fermi Bubbles Inflated by Winds Launched from the Hot Accretion Flow in Sgr A*
• Local ISM 3D distribution and soft X-ray background: Inferences on nearby hot gas and the North Polar Spur
• Giant Explosion at the Galactic Center and Huge Shocked Shells in the Halo
• Absolutely calibrated radio polarimetry of the inner Galaxy at 2.3 GHz and 4.8 GHz
• Distances to nearby molecular clouds and star forming regions.III. Localizing extinction jumps with a Hipparcos calibration of 2mass photometry
• 2mass/Hipparcos Extinctions and Distances in the Serpens - Aquila Region.IV. Error Propagation. Individual stars and mean values

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