dc.contributor.author |
Ghosh, K. K |
|
dc.contributor.author |
Soundararajaperumal, S |
|
dc.date.accessioned |
2008-07-02T11:51:20Z |
|
dc.date.available |
2008-07-02T11:51:20Z |
|
dc.date.issued |
1991-12 |
|
dc.identifier.citation |
Astronomy and Astrophysics, Vol. 252, No. 1, pp. 53 - 55 |
en |
dc.identifier.issn |
0004-6361 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/2578 |
|
dc.description.abstract |
A study of the X-ray (0.1-10 keV) spectrum from the radio-loud quasar, PKS 1217 + 023 is presented. This quasar was observed with Exosat on two epochs in January 29 and May 14, 1984. The data were obtained from the Exosat archives. The soft (0.1-2 keV) and hard (2-10 keV) X-ray fluxes have displayed significant changes between the two observations. There is neither a detection of any significant low energy absorption within the quasar nor is there any evidence for the presence of soft X-ray excess. The energy indices, alpha, of the power law fits to the LE + ME data of January 29 and May 14 are 0.98+0.18/-0.14 and 0.82+0.12/-0.11 (error bars are with 90 percent confidence), respectively. The values of alpha are consistent with the values obtained from Ginga observations but larger than that obtained from Einstein data. A thermal bremsstrahlung model also provides a good fit to the X-ray data of PKS 1217 + 023. |
en |
dc.format.extent |
494401 bytes |
|
dc.format.mimetype |
application/pdf |
|
dc.language.iso |
en |
en |
dc.publisher |
EDP Sciences |
en |
dc.relation.uri |
http://adsabs.harvard.edu/abs/1991A%26A...252...53G |
en |
dc.subject |
Quasars |
en |
dc.subject |
Radio sources (Astronomy) |
en |
dc.subject |
X ray spectra |
en |
dc.subject |
Active galactic nuclei |
en |
dc.subject |
Exosat satellite |
en |
dc.subject |
Extragalactic radio rources |
en |
dc.title |
X-ray spectrum of the radio-loud quasar PKS 1217 + 023 |
en |
dc.type |
Article |
en |