TANAMI: tracking active galactic nuclei with austral milliarcsecond interferometry

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dc.contributor.authorOjha, R.
dc.contributor.authorKadler, M.
dc.contributor.authorBöck, M.
dc.contributor.authorBooth, R.
dc.contributor.authorDutka, M. S.
dc.contributor.authorEdwards, P. G.
dc.contributor.authorFey, A. L.
dc.contributor.authorFuhrmann, L.
dc.contributor.authorGaume, R. A.
dc.contributor.authorHase, H.
dc.contributor.authorHoriuchi, S.
dc.contributor.authorJauncey, D. L.
dc.contributor.authorJohnston, K. J.
dc.contributor.authorKatz, U.
dc.contributor.authorLister, M.
dc.contributor.authorLovell, J. E. J.
dc.contributor.authorMüller, C.
dc.contributor.authorPlötz, C.
dc.contributor.authorQuick, J. F. H.
dc.contributor.authorRos, E.
dc.contributor.authorTaylor, G. B.
dc.contributor.authorThompson, D. J.
dc.contributor.authorTingay, S. J.
dc.contributor.authorTosti, G.
dc.contributor.authorTzioumis, A. K.
dc.contributor.authorWilms, J.
dc.contributor.authorZensus, J. A.
dc.date.accessioned2020-05-01T14:11:49Z
dc.date.available2020-05-01T14:11:49Z
dc.date.issued2010-09-10
dc.description.abstractContext. A number of theoretical models vie to explain the γ-ray emission from active galactic nuclei (AGN). This was a key discovery of EGRET. With its broader energy coverage, higher resolution, wider field of view and greater sensitivity, the Large Area Telescope (LAT) of the Fermi Gamma-ray Space Telescope is dramatically increasing our knowledge of AGN γ-ray emission. However, discriminating between competing theoretical models requires quasi-simultaneous observations across the electromagnetic spectrum. By resolving the powerful parsec-scale relativistic outflows in extragalactic jets and thereby allowing us to measure critical physical properties, Very Long Baseline Interferometry observations are crucial to understanding the physics of extragalactic γ-ray objects. Aims. We introduce the TANAMI program (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry) which is monitoring an initial sample of 43 extragalactic jets located south of -30 degrees declination at 8.4 GHz and 22 GHz since 2007. All aspects of the program are discussed. First epoch results at 8.4 GHz are presented along with physical parameters derived therefrom. Methods. These observations were made during 2007/2008 using the telescopes of the Australian Long Baseline Array in conjunction with Hartebeesthoek in South Africa. These data were correlated at the Swinburne University correlator. Results. We present first epoch images for 43 sources, some observed for the first time at milliarcsecond resolution. Parameters of these images as well as physical parameters derived from them are also presented and discussed. These and subsequent images from the TANAMI survey are available at http://pulsar.sternwarte.uni-erlangen.de/tanami/. Conclusions. We obtain reliable, high dynamic range images of the southern hemisphere AGN. All the quasars and BL Lac objects in the sample have a single-sided radio morphology. Galaxies are either double-sided, single-sided or irregular. About 28% of the TANAMI sample has been detected by LAT during its first three months of operations. Initial analysis suggests that when galaxies are excluded, sources detected by LAT have larger opening angles than those not detected by LAT. Brightness temperatures of LAT detections and non-detections seem to have similar distributions. The redshift distributions of the TANAMI sample and sub-samples are similar to those seen for the bright γ-ray AGN seen by LAT and EGRET but none of the sources with a redshift above 1.8 have been detected by LAT.en_US
dc.description.sponsorshipWe are grateful to Dirk Behrend, Neil Gehrels, Julie McEnery, David Murphy, and John Reynolds, who contributed in numerous ways to the success of the TANAMI program so far. Furthermore, we thank the Fermi/LAT AGN group for the good collaboration. The Long Baseline Array is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. This work made use of the Swinburne University of Technology software correlator, developed as part of the Australian Major National Research Facilities Programme and operated under licence. M.K. has been supported in part by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Oak Ridge Associated Universities through a contract with NASA. We would like to thank the staff of the Swinburne correlator for their unflagging support. This research has made use of data from the NASA/IPAC Extragalactic Database (NED, operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration); and the SIMBAD database (operated at CDS, Strasbourg, France). This research has made use of NASA’s Astrophysics Data System. This research has made use of the United States Naval Observatory (USNO) Radio Reference Frame Image Database (RRFID).en_US
dc.description.urihttps://www.aanda.org/articles/aa/abs/2010/11/aa12724-09/aa12724-09.htmlen_US
dc.format.extent25 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2tkcp-g5n8
dc.identifier.citationTANAMI: tracking active galactic nuclei with austral milliarcsecond interferometry - I. First-epoch 8.4 GHz images R. Ojha, M. Kadler, M. Böck, R. Booth, M. S. Dutka, P. G. Edwards, A. L. Fey, L. Fuhrmann, R. A. Gaume, H. Hase, S. Horiuchi, D. L. Jauncey, K. J. Johnston, U. Katz, M. Lister, J. E. J. Lovell, C. Müller, C. Plötz, J. F. H. Quick, E. Ros, G. B. Taylor, D. J. Thompson, S. J. Tingay, G. Tosti, A. K. Tzioumis, J. Wilms and J. A. Zensus A&A, 519 (2010) A45 DOI: https://doi.org/10.1051/0004-6361/200912724en_US
dc.identifier.urihttps://doi.org/10.1051/0004-6361/200912724
dc.identifier.urihttp://hdl.handle.net/11603/18397
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2010A%26A...519A..45O
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2010A%26A...519A..45O
dc.language.isoen_USen_US
dc.publisherEDP sciencesen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleTANAMI: tracking active galactic nuclei with austral milliarcsecond interferometryen_US
dc.typeTexten_US

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