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Title: Serendipitous discovery of a dying giant radio galaxy associated with NGC 1534, using the Murchison Widefield array
Authors: Hurley-Walker, N.
Deshpande, A.A.
Prabu, T.
Udaya Shankar, N.
Srivani, K.S.
Subrahmanyan, Ravi
+25 Co-authors
Keywords: techniques interferometric
Radio continuum
Issue Date: 1-Mar-2015
Publisher: Oxford University Press for The Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2015, Vol. 447, p2468-2478
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−2. 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 × 10−7 Mpc−3 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.
Description: Open Access
ISSN: 0035-8711
1365-2966 - (online)
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Copyright: 2015 The authors & the Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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