Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the murchison widefield array

Natasha Hurley-Walker, Melanie Johnston-Hollitt, Ron Ekers, Richard Hunstead, Elaine M. Sadler, Luke Hindson, Paul Hancock, Gianni Bernardi, Judd Bowman, Frank Briggs, Roger Cappallo, Brian Corey, Avinash A. Deshpande, David Emrich, Bryan M. Gaensler, Robert Goeke, Lincoln Greenhill, Bryna J. Hazelton, Jacqueline Hewitt, David L. Kaplan & 24 others Justin Kasper, Eric Kratzenberg, Colin Lonsdale, Mervyn Lynch, Daniel Mitchell, Russell McWhirter, Miguel Morales, Edward Morgan, Divya Oberoi, André Offringa, Stephen Ord, Thiagaraj Prabu, Alan Rogers, Anish Roshi, Udaya Shankar, K. Srivani, Ravi Subrahmanyan, Steven Tingay, Mark Waterson, Randall B. Wayth, Rachel Webster, Alan Whitney, Andrew Williams, Chris Williams

Research output: Contribution to journalArticle

15 Citations (Scopus)

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 -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.

Original languageEnglish (US)
Pages (from-to)2468-2478
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume447
Issue number3
DOIs
StatePublished - 2015

Fingerprint

radio galaxies
radio
radio emission
lobes
brightness
indication
dust
luminosity
galaxies
life (durability)
cycles

Keywords

  • Galaxies: active
  • Galaxies: general
  • Galaxies: individual: NGC 1534
  • Radio continuum: galaxies
  • Techniques: interferometric

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hurley-Walker, N., Johnston-Hollitt, M., Ekers, R., Hunstead, R., Sadler, E. M., Hindson, L., ... Williams, C. (2015). Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the murchison widefield array. Monthly Notices of the Royal Astronomical Society, 447(3), 2468-2478. https://doi.org/10.1093/mnras/stu2570

Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the murchison widefield array. / Hurley-Walker, Natasha; Johnston-Hollitt, Melanie; Ekers, Ron; Hunstead, Richard; Sadler, Elaine M.; Hindson, Luke; Hancock, Paul; Bernardi, Gianni; Bowman, Judd; 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, André; 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.

In: Monthly Notices of the Royal Astronomical Society, Vol. 447, No. 3, 2015, p. 2468-2478.

Research output: Contribution to journalArticle

Hurley-Walker, N, Johnston-Hollitt, M, Ekers, R, Hunstead, R, Sadler, EM, Hindson, L, Hancock, P, Bernardi, G, Bowman, J, Briggs, F, Cappallo, R, Corey, B, Deshpande, AA, Emrich, D, Gaensler, BM, Goeke, R, Greenhill, L, Hazelton, BJ, Hewitt, J, Kaplan, DL, 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, RB, Webster, R, Whitney, A, Williams, A & Williams, C 2015, 'Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the murchison widefield array', Monthly Notices of the Royal Astronomical Society, vol. 447, no. 3, pp. 2468-2478. https://doi.org/10.1093/mnras/stu2570
Hurley-Walker, Natasha ; Johnston-Hollitt, Melanie ; Ekers, Ron ; Hunstead, Richard ; Sadler, Elaine M. ; Hindson, Luke ; Hancock, Paul ; Bernardi, Gianni ; Bowman, Judd ; 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, André ; 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. / Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the murchison widefield array. In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 447, No. 3. pp. 2468-2478.
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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 -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.",
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AU - Hurley-Walker, Natasha

AU - Johnston-Hollitt, Melanie

AU - Ekers, Ron

AU - Hunstead, Richard

AU - Sadler, Elaine M.

AU - Hindson, Luke

AU - Hancock, Paul

AU - Bernardi, Gianni

AU - Bowman, Judd

AU - Briggs, Frank

AU - Cappallo, Roger

AU - Corey, Brian

AU - Deshpande, Avinash A.

AU - Emrich, David

AU - Gaensler, Bryan M.

AU - Goeke, Robert

AU - Greenhill, Lincoln

AU - Hazelton, Bryna J.

AU - Hewitt, Jacqueline

AU - Kaplan, David L.

AU - Kasper, Justin

AU - Kratzenberg, Eric

AU - Lonsdale, Colin

AU - Lynch, Mervyn

AU - Mitchell, Daniel

AU - McWhirter, Russell

AU - Morales, Miguel

AU - Morgan, Edward

AU - Oberoi, Divya

AU - Offringa, André

AU - Ord, Stephen

AU - Prabu, Thiagaraj

AU - Rogers, Alan

AU - Roshi, Anish

AU - Shankar, Udaya

AU - Srivani, K.

AU - Subrahmanyan, Ravi

AU - Tingay, Steven

AU - Waterson, Mark

AU - Wayth, Randall B.

AU - Webster, Rachel

AU - Whitney, Alan

AU - Williams, Andrew

AU - Williams, Chris

PY - 2015

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N2 - 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 -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.

AB - 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 -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.

KW - Galaxies: active

KW - Galaxies: general

KW - Galaxies: individual: NGC 1534

KW - Radio continuum: galaxies

KW - Techniques: interferometric

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JO - Monthly Notices of the Royal Astronomical Society

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