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IDV observations & study of the quasar 0917+624

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Abstract

We carried out intra-day variability (IDV) observations from August 2005 to January 2010 with the Urumqi 25 m radio telescope for a dozen IDV sources including the quasar 0917+624. This target exhibited pronounced centimeter-band, intra-day variability during the 1980s–1990s, but its strong IDV phase ceased in 2000. The source showed no IDV in the majority of the Urumqi observing sessions, although weak IDV activity was detected in some. Multifrequency UMRAO data for 0917+624 show that the spectral index is steeper during the weak and non-IDV phases than during the strong IDV phase, supporting the idea that the size of the scintillating component may be enlarged in the weak/non IDV phases.

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Acknowledgements

We thank the anonymous reviewer for valuable comments. This research has made use of data from the University of Michigan Radio Astronomy Observatory which has been supported by the University of Michigan and by a series of grants from the National Science Foundation, most recently AST-0607523. The work is supported by the National Natural Science Foundation of China (Grant No. 11073036) and the 973 Program of China (2009CB824800).

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Authors and Affiliations

  1. Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, 830011, P.R. China

    Xiang Liu & Quanwei Li

  2. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing, 210008, P.R. China

    Xiang Liu

  3. University of Chinese Academy of Sciences, Beijing, 100049, P.R. China

    Quanwei Li

  4. Max-Plank-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany

    Thomas P. Krichbaum

  5. Department of Astronomy, University of Michigan, Ann Arbor, MI, 48109-1042, USA

    Margo F. Aller & Hugh D. Aller

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  1. Xiang Liu
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  2. Quanwei Li
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  3. Thomas P. Krichbaum
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  4. Margo F. Aller
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  5. Hugh D. Aller
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Correspondence to Xiang Liu.

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Liu, X., Li, Q., Krichbaum, T.P. et al. IDV observations & study of the quasar 0917+624. Astrophys Space Sci 346, 15–17 (2013). https://doi.org/10.1007/s10509-013-1446-x

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