X-ray absorption by ionized oxygen in ASCA spectra of the infrared quasar IRAS 13349+2438

Details X-ray absorption by ionized oxygen in ASCA spectra of the infrared quasar IRAS 13349+2438 X-ray absorption by ionized oxygen in ASCA spectra of the infrared quasar IRAS 13349+2438

1997-07-18

arxiv.org/abs/astro-ph/9707216v1

Astronomy and Astrophysics

Astrophysics

8 pages, MNRAS, also available from http://hea-www.harvard.edu/QEDT/niel/papers/papers.html

Scientific paper

We present evidence for X-ray absorption by ionized oxygen in ASCA spectra of the prototype infrared quasar IRAS 13349+2438. This powerful (2E46 erg/s) quasar was studied in detail with ROSAT, and the combination of the X-ray data and optical/near-infrared spectropolarimetry strongly suggested the presence of a dusty ionized (`warm') absorber along the line of sight to the central X-ray source. The ASCA spectra, in contrast to an earlier claim, show evidence for ionized oxygen edges, and the presence of such edges appears to provide the most physically plausible interpretation of the data. Thus, the ASCA spectra support the dusty warm absorber hypothesis. The ASCA data also allow the physical properties of the warm absorber to be constrained far better than before. A one-zone warm absorber model indicates the ionized column to be in the range (2--6) x 10^{21} cm^{-2}, and it gives an ionization parameter of xi=31^{+12}_{-12} erg cm s^{-1}. The dusty warm absorber appears to have a density below 3E8 cm^{-3}, and it is probably located outside the broad-line region. The dust in the warm absorber does not appear to have been heavily sputtered or destroyed via other means. Based on the ASCA fitting, we suggest that ultraviolet absorption lines from the warm absorber may be detectable and discuss how they can further constrain the warm absorber properties. We compare and contrast the X-ray properties of IRAS 13349+2438 with those of broad absorption line quasars. We comment on the steep > 2 keV continuum of IRAS 13349+2438 and examine the relevance to some models of radiative Fe II formation.

Affiliated with

Also associated with

No associations

Rating

X-ray absorption by ionized oxygen in ASCA spectra of the infrared quasar IRAS 13349+2438 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 X-ray absorption by ionized oxygen in ASCA spectra of the infrared quasar IRAS 13349+2438, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray absorption by ionized oxygen in ASCA spectra of the infrared quasar IRAS 13349+2438 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-334245