SIMBAD references

2015MNRAS.447.2468H - Mon. Not. R. Astron. Soc., 447, 2468-2478 (2015/March-1)

Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the Murchison Widefield Array.

HURLEY-WALKER N., JOHNSTON-HOLLITT M., EKERS R., HUNSTEAD R., SADLER E.M., HINDSON L., HANCOCK P., BERNARDI G., BOWMAN J.D., BRIGGS F., CAPPALLO R., COREY B., DESHPANDE A.A., EMRICH D., GAENSLER B.M., GOEKE R., GREENHILL L., HAZELTON B.J., HEWITT J., KAPLAN D.L., KASPER J., KRATZENBERG E., LONSDALE C., LYNCH M., MITCHELL D., McWHIRTER R., MORALES M., MORGAN E., OBEROI D., OFFRINGA A., ORD S., PRABU T., ROGERS A., ROSHI A., SHANKAR U., SRIVANI K., SUBRAHMANYAN R., TINGAY S., WATERSON M., WAYTH R.B., WEBSTER R., WHITNEY A., WILLIAMS A. and WILLIAMS C.

Abstract (from CDS):

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/arcmin2. 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 percent. We estimate the space density of this low brightness (dying) phase of radio galaxy evolution as 7x10–7/Mpc3 and argue that normal AGN cannot spend more than 6 percent of their lifetime in this phase if they all go through the same cycle.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): techniques: interferometric - galaxies: active - galaxies: general - galaxies: individual:NGC 1534 - radio continuum: galaxies

Simbad objects: 19

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