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Oxygen, Neon, and Iron X-Ray Absorption in the Local Interstellar MediumWe present a detailed study of X-ray absorption in the local interstellar medium by analyzing the X-ray spectra of 24 galactic sources obtained with the Chandra High Energy Transmission Grating Spectrometer and the XMM-Newton Reflection Grating Spectrometer. Methods. By modeling the continuum with a simple broken power-law and by implementing the new ISMabs X-ray absorption model, we have estimated the total H, O, Ne, and Fe column densities towards the observed sources. Results. We have determined the absorbing material distribution as a function of source distance and galactic latitude longitude. Conclusions. Direct estimates of the fractions of neutrally, singly, and doubly ionized species of O, Ne, and Fe reveal the dominance of the cold component, thus indicating an overall low degree of ionization. Our results are expected to be sensitive to the model used to describe the continuum in all sources.
Document ID
20170002678
Document Type
Reprint (Version printed in journal)
Authors
Gatuzz, Efrain (Max-Planck-Inst. fuer Astrophysik Garching, Germany)
Garcia, Javier (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Kallman, Timothy R. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Mendoza, Claudio (Instituto Venezolano de Investigaciones Cientificas Caracas, Venezuela)
Date Acquired
March 29, 2017
Publication Date
March 28, 2016
Publication Information
Publication: Astronomy & Astrophysics
Volume: 588
ISSN: 0004-6361
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN40773
Distribution Limits
Public
Copyright
Other
Keywords
SM: general / ISM: atoms / ISM: abundances / ISM: structure / X-rays: ISM