Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the Murchison Widefield Array
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Author
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, Andre
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
Attention
2299/18998
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 $\sim$700\,kpc. We present details of the radio emission along with a detailed comparison with other radio galaxies with disks. NGC1534 is the lowest surface brightness radio galaxy known with an estimated scaled 1.4-GHz surface brightness of just 0.2\,mJy\,arcmin$^{-2}$. The radio lobes have one of the steepest spectral indices yet observed: $\alpha=-2.1\pm0.1$, and the core to lobe luminosity ratio is $