ASCA and ROSAT observations of NRAO 140 and IX Persei

Details ASCA and ROSAT observations of NRAO 140 and IX Persei ASCA and ROSAT observations of NRAO 140 and IX Persei

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...445..660t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 445, no. 2, p. 660-665

Astronomy and Astrophysics

Astronomy

19

Data Reduction, Quasars, Radio Astronomy, Rosat Mission, X Ray Astronomy, X Ray Stars, Absorption Spectra, Active Galactic Nuclei, Energy Spectra, Imaging Spectrometers, Stellar Luminosity

Scientific paper

We report the results from observations of National Radio Astronomy Observatory (NRAO) 140 carried out in the X-ray band using ROSAT and Advanced Satellite for Cosmology and Astrophysics (ASCA) in 1992 and 1994. We find the source to be absorbed by an effective hydrogen column density of approximately 3 x 1021 atoms/sq cm during both epochs, consistent with the combined atomic and molecular column inferred from radio measurements along this line of sight through the Perseus cloud complex. We compare these results with previous X-ray absorption measurements and briefly comment upon the origin of the excess absorption which has been seen toward this source. We find the ASCA spectrum of NRAO 140 is well described by a power law of energy index alpha = 0.73 +/- 0.03 and also yields the tightest constraint to date on Fe K-shell emission, with 90% confidence upper limits of 38 and 31 eV for a narrow line at a rest frame energy of 6.4 and 6.7 keV respectively. This, along with a lack of hardening towards higher energies, suggests that either NRAO 140 is devoid of cold reprocessing material, the reprocessing material has a geometry in which the imprinted features are weak, and/or the X-ray emission is relativistically beamed towards us. We also report the detection of a serendipitous source in both the Advanced Satellite for Cosmology and Astrophysics Gas Imaging Spectrometer (ASCA GIS) and ROSAT fields of view. We identify this source as the binary star system IX Per and find its spectrum to be well fitted by a two-temperature Raymond-Smith plasma.

Affiliated with

Also associated with

No associations

Rating

ASCA and ROSAT observations of NRAO 140 and IX Persei does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with ASCA and ROSAT observations of NRAO 140 and IX Persei, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ASCA and ROSAT observations of NRAO 140 and IX Persei will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1202130