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|Title:||Serendipitous discovery of a dying giant radio galaxy associated with NGC 1534, using the Murchison Widefield array|
Udaya Shankar, N.
|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.|
1365-2966 - (online)
|Copyright:||2015 The authors & the Royal Astronomical Society|
|Appears in Collections:||Research Papers (A&A)|
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|2015_MNRAS_447_2468.pdf||Restricted Access||4.88 MB||Adobe PDF||View/Open|
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