Milliarcsecond-scale structure in the gamma-ray loud quasar PKS 1622-297
We made a high-resolution VLBI observation of the gamma-ray loud quasar PKS 1622-297 with the HALCA spacecraft and ground radio telescopes at 5 GHz in 1998 February, almost 3 yr after the source exhibited a spectacular GeV gamma-ray flare. The source shows an elongated structure toward the west on t...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
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Nihon Tenmon Gakkai
2006
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| Online Access: | http://pasj.asj.or.jp/v58/n2/580203/580203a.html http://hdl.handle.net/20.500.11937/11513 |
| _version_ | 1848747826182356992 |
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| author | Wajima, K. Bignall, Hayley Kobayashi, H. Hirabayashi, H. Murata, Y. Edwards, P. Tsuboi, M. Fujisawa, K. |
| author_facet | Wajima, K. Bignall, Hayley Kobayashi, H. Hirabayashi, H. Murata, Y. Edwards, P. Tsuboi, M. Fujisawa, K. |
| author_sort | Wajima, K. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We made a high-resolution VLBI observation of the gamma-ray loud quasar PKS 1622-297 with the HALCA spacecraft and ground radio telescopes at 5 GHz in 1998 February, almost 3 yr after the source exhibited a spectacular GeV gamma-ray flare. The source shows an elongated structure toward the west on the parsec scale. The visibility data are well modeled by three distinct components: a bright core and two weaker jet components. Comparison with previous observations confirms that the jet components have an apparent superluminal motion up to 12.1h-1 c, with the inner jet components having lower superluminal speeds. We applied the inverse Compton catastrophe model and derived a Doppler factor, d, of 2.45, which is rather lower than those of other gamma-ray loud active galactic nuclei (AGNs), suggesting that the source was in a more quiescent phase at the epoch of our observation. As an alternative probe of the subparsec-scale structure, we also present the results from multiepoch ATCA total flux monitoring, which indicate the presence of persistent intraday variability consistent with refractive interstellar scintillation. We examined the gamma-ray emission mechanism in light of these observations. |
| first_indexed | 2025-11-14T06:55:19Z |
| format | Journal Article |
| id | curtin-20.500.11937-11513 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:55:19Z |
| publishDate | 2006 |
| publisher | Nihon Tenmon Gakkai |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-115132017-02-28T01:33:30Z Milliarcsecond-scale structure in the gamma-ray loud quasar PKS 1622-297 Wajima, K. Bignall, Hayley Kobayashi, H. Hirabayashi, H. Murata, Y. Edwards, P. Tsuboi, M. Fujisawa, K. individual (PKS 1622-297)—ISM: general - — techniques: interferometric quasars galaxies: active—galaxies jets—galaxies We made a high-resolution VLBI observation of the gamma-ray loud quasar PKS 1622-297 with the HALCA spacecraft and ground radio telescopes at 5 GHz in 1998 February, almost 3 yr after the source exhibited a spectacular GeV gamma-ray flare. The source shows an elongated structure toward the west on the parsec scale. The visibility data are well modeled by three distinct components: a bright core and two weaker jet components. Comparison with previous observations confirms that the jet components have an apparent superluminal motion up to 12.1h-1 c, with the inner jet components having lower superluminal speeds. We applied the inverse Compton catastrophe model and derived a Doppler factor, d, of 2.45, which is rather lower than those of other gamma-ray loud active galactic nuclei (AGNs), suggesting that the source was in a more quiescent phase at the epoch of our observation. As an alternative probe of the subparsec-scale structure, we also present the results from multiepoch ATCA total flux monitoring, which indicate the presence of persistent intraday variability consistent with refractive interstellar scintillation. We examined the gamma-ray emission mechanism in light of these observations. 2006 Journal Article http://hdl.handle.net/20.500.11937/11513 http://pasj.asj.or.jp/v58/n2/580203/580203a.html Nihon Tenmon Gakkai restricted |
| spellingShingle | individual (PKS 1622-297)—ISM: general - — techniques: interferometric quasars galaxies: active—galaxies jets—galaxies Wajima, K. Bignall, Hayley Kobayashi, H. Hirabayashi, H. Murata, Y. Edwards, P. Tsuboi, M. Fujisawa, K. Milliarcsecond-scale structure in the gamma-ray loud quasar PKS 1622-297 |
| title | Milliarcsecond-scale structure in the gamma-ray loud quasar PKS 1622-297 |
| title_full | Milliarcsecond-scale structure in the gamma-ray loud quasar PKS 1622-297 |
| title_fullStr | Milliarcsecond-scale structure in the gamma-ray loud quasar PKS 1622-297 |
| title_full_unstemmed | Milliarcsecond-scale structure in the gamma-ray loud quasar PKS 1622-297 |
| title_short | Milliarcsecond-scale structure in the gamma-ray loud quasar PKS 1622-297 |
| title_sort | milliarcsecond-scale structure in the gamma-ray loud quasar pks 1622-297 |
| topic | individual (PKS 1622-297)—ISM: general - — techniques: interferometric quasars galaxies: active—galaxies jets—galaxies |
| url | http://pasj.asj.or.jp/v58/n2/580203/580203a.html http://hdl.handle.net/20.500.11937/11513 |