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http://hdl.handle.net/20.500.12386/24705| Title: | Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the Murchison Widefield Array | Authors: | Hurley-Walker, Natasha Johnston-Hollitt, Melanie Ekers, Ron Hunstead, Richard Sadler, Elaine M. Hindson, Luke Hancock, Paul BERNARDI, GIANNI Bowman, Judd D. Briggs, Frank Cappallo, Roger Corey, Brian Deshpande, Avinash A. Emrich, David Gaensler, Bryan M. Goeke, Robert Greenhill, Lincoln Hazelton, Bryna J. Hewitt, Jacqueline Kaplan, David L. Kasper, Justin Kratzenberg, Eric Lonsdale, Colin Lynch, Mervyn Mitchell, Daniel McWhirter, Russell Morales, Miguel Morgan, Edward Oberoi, Divya Offringa, André Ord, Stephen Prabu, Thiagaraj Rogers, Alan Roshi, Anish Shankar, Udaya Srivani, K. Subrahmanyan, Ravi Tingay, Steven Waterson, Mark Wayth, Randall B. Webster, Rachel Whitney, Alan Williams, Andrew Williams, Chris |
Issue Date: | 2015 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 447 | Issue: | 3 | First Page: | 2468 | Abstract: | Recent observations with the Murchison Widefield Array at 185 MHz have serendipitously unveiled a heretofore unknown giant and relatively nearby (z = 0.0178) radio galaxy associated with NGC 1534. The diffuse emission presented here is the first indication that NGC 1534 is one of a rare class of objects (along with NGC 5128 and NGC 612) in which a galaxy with a prominent dust lane hosts radio emission on scales of ̃700 kpc. We present details of the radio emission along with a detailed comparison with other radio galaxies with discs. NGC 1534 is the lowest surface brightness radio galaxy known with an estimated scaled 1.4-GHz surface brightness of just 0.2 mJy arcmin<SUP>-2</SUP>. The radio lobes have one of the steepest spectral indices yet observed: α = -2.1 ± 0.1, and the core to lobe luminosity ratio is <0.1 per cent. We estimate the space density of this low brightness (dying) phase of radio galaxy evolution as 7 × 10<SUP>-7</SUP> Mpc<SUP>-3</SUP> and argue that normal AGN cannot spend more than 6 per cent of their lifetime in this phase if they all go through the same cycle. | Acknowledgments: | We thank Drs Leith Godfrey and Lakshmi Saripalli for useful discussions on properties of dying radio galaxies. MJ-H is supported in this work through the Marsden Fund administered by the Royal Society of New Zealand. This scientific work makes use of the Murchison Radio-astronomy Observatory, operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. Support for the MWA comes from the U.S. National Science Foundation (grants AST-0457585, PHY-0835713, CAREER-0847753, and AST-0908884), the Australian Research Council (LIEF grants LE0775621 and LE0882938), the U.S. Air Force Office of Scientific Research (grant FA9550-0510247), and the Centre for All-sky Astrophysics (an Australian Research Council Centre of Excellence funded by grant CE110001020). Support is also provided by the Smithsonian Astrophysical Observatory, the MIT School of Science, the Raman Research Institute, the Australian National University, and the Victoria University of Wellington (via grant MED-E1799 from the New Zealand Ministry of Economic Development and an IBM Shared University Research Grant). The Australian Federal government provides additional support via the Commonwealth Scientific and Industrial Research Organization (CSIRO), National Collaborative Research Infrastructure Strategy, Education Investment Fund, and the Australia India Strategic Research Fund, and Astronomy Australia Limited, under contract to Curtin University. We acknowledge the iVEC Petabyte Data Store, the Initiative in Innovative Computing and the CUDA Center for Excellence sponsored by NVIDIA at Harvard University, and the International Centre for Radio Astronomy Research (ICRAR), a Joint Venture of Curtin University and The University of Western Australia, funded by the Western Australian State government. This research has made use of the National Aeronautics and Space Administration (NASA)/Infrared Processing and Analysis Center (IPAC) Infrared Science Archive and the NASA/IPAC Extragalactic Database (NED) which are operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. This research has also made use of NASA's Astrophysics Data System. The DSS was produced at the Space Telescope Science Institute under US Government grant NAG W-2166 and is based on photographic data obtained using The UK Schmidt Telescope. The UK Schmidt Telescope was operated by the Royal Observatory Edinburgh, with funding from the UK Science and Engineering Research Council, until 1988 June, and thereafter by the Anglo-Australian Observatory. Original plate material is copyright of the Royal Observatory Edinburgh and the Anglo-Australian Observatory. The plates were processed into the present compressed digital form with their permission. SuperCOSMOS Sky Survey material is based on photographic data originating from the UK, Palomar and ESO Schmidt telescopes and is provided by the Wide-Field Astronomy Unit, Institute for Astronomy, University of Edinburgh. | URI: | http://hdl.handle.net/20.500.12386/24705 | URL: | https://academic.oup.com/mnras/article/447/3/2468/987022 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stu2570 | Bibcode ADS: | 2015MNRAS.447.2468H | Fulltext: | open |
| Appears in Collections: | 1.01 Articoli in rivista |
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| Hurley-Walker2015.pdf | 4.88 MB | Adobe PDF | View/Open |
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