| タイトル | 4U1722 + 11 - The discovery of an X-ray selected BL Lac object |
| 著者（英） | Tapia, S.; Ward, M. J.; Ulvestad, J. S.; Wilson, A. S.; Griffiths, R. E. |
| 著者所属（英） | Jet Propulsion Lab., California Inst. of Tech.|Arizona Univ.|Washington Univ.|Harvard-Smithsonian Center for Astrophysics|Maryland Univ.|Cambridge Univ. |
| 発行日 | 1989-09-01 |
| 言語 | eng |
| 内容記述 | The Uhuru X-ray source 4U1722 + 11 was observed using the microchannel-plate detector (High Resolution Imager) on the Einstein Observatory, and its coordinates measured to a precision of about 5 arcsec. A 16th-magnitude stellar object within the error circle was observed spectroscopically at CTIO, and at the AAT, and found to have a featureless continuum. Subsequent radio observations at the VLA have established that the object is a radio source at the level of 60 mJy, and optical polarization measurements have determined that the source exhibits variable polarization at the level of 10 percent. On the basis of these observations, it is concluded that 4U1722 + 11 is a member of the class of objects known as X-ray selected blazars of BL Lac objects. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 89A53554 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/361336 |
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