NDLI: Progress of research on AGNs at the Urumqi Observatory

Content Provider	Springer Nature Link
Author	Cui, Lang Song, HuaGang Liu, Jun Liu, Xiang Krichbaum, T. P. Fuhrmann, L. Marchili, N.
Copyright Year	2010
Abstract	We report the progress on Very Long Baseline Interferometry (VLBI) observations of Gigahertz Peaked Spectrum (GPS) radio sources, and single-dish observations of active galactic nuclei (AGNs). The GPS sources are a kind of young AGNs observable in radio. From our VLBI observations at 1.6 and 5 GHz with the European VLBI Network (EVN) including the Urumqi and Shanghai stations, most GPS sources show compact doubles with sizes less than 1 kiloparsec. We have classified the sources into double-lobes, core-jets, and complex structures according to the spectral indices as well as images. We also estimated the values of the jet viewing angle for the symmetric objects. In addition, we are monitoring a few samples of AGNs with the Urumqi 25-meter radio telescope, in order to find flux variability. We detected rapid flux variability in quasar 1156+295, and relatively slow variability in a few of the others. The origin of the rapid variability is discussed. Moreover, we launched a radio-optical monitoring program called Fermi-AGN in 2009.
Starting Page	244
Ending Page	246
Page Count	3
File Format	PDF
ISSN	16747348
Journal	Science in China Series G
Volume Number	53
Issue Number	1
e-ISSN	18622844
Language	English
Publisher	SP Science China Press
Publisher Date	2010-05-20
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	active galactic nuclei VLBI intra-day variability Astronomy, Observations and Techniques Classical Continuum Physics Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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