2015MNRAS.447.2468H

Query : 2015MNRAS.447.2468H

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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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 612 Sy2 01 33 57.751 -36 29 35.80   13.90 13.15 12.33   ~ 252 0
2 LEDA 97372 Sy2 03 15 52.11290 -19 06 44.2368   17.48       ~ 62 1
3 NAME HOR-RET SUPERCL SCG 03 16 -48.0           ~ 70 3
4 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
5 GLEAM J034044-650705 QSO 03 40 44.6 -65 07 12           ~ 17 1
6 PKS 0400-613 Rad 04 01 28.7 -61 10 23           ~ 1 0
7 PMN J0406-6050 Rad 04 06 12.1767835705 -60 50 32.113487932           ~ 6 1
8 PKS 0405-640 Rad 04 06 15.7 -63 54 58           ~ 1 0
9 ICRF J040820.3-654509 Sy2 04 08 20.37884 -65 45 09.0806     18.0     ~ 207 1
10 NGC 1534 GiG 04 08 46.0768124832 -62 47 51.554038632   13.76   12.23   ~ 31 0
11 ACO 3229 ClG 04 11 08 -62 43.3           ~ 9 0
12 PKS 0420-62 rG 04 20 56.04155 -62 23 38.8505           ~ 28 1
13 ACO 3266 ClG 04 31 26.4 -61 25 17           ~ 447 0
14 GLEAM J043131-621837 BLL 04 31 31.0443927622 -62 18 37.293279409           ~ 6 1
15 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
16 Z 147-20 Sy2 07 25 37.25833 +29 57 14.7920   15.60       ~ 105 2
17 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
18 6dFGS gJ140948.9-030233 rG 14 09 48.8587886760 -03 02 32.631257292   17.98   16.44   ~ 44 0
19 LEDA 1052974 Sy1 23 45 32.7164986848 -04 49 25.303587060   15.88   14.55   ~ 48 0

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