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; 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

doi:10.1093/mnras/stu2570

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. KaplanJustin 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

Earth and Space Exploration, School of (SESE)

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

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.

Original language	English (US)
Pages (from-to)	2468-2478
Number of pages	11
Journal	Monthly Notices of the Royal Astronomical Society
Volume	447
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stu2570
State	Published - Mar 1 2015

Keywords

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

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/stu2570

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Hurley-Walker, N., Johnston-Hollitt, M., Ekers, R., Hunstead, R., Sadler, E. M., Hindson, L., Hancock, P., Bernardi, G., Bowman, J., Briggs, F., Cappallo, R., Corey, B., Deshpande, A. A., Emrich, D., Gaensler, B. M., Goeke, R., Greenhill, L., Hazelton, B. J., Hewitt, J., ... 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

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

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

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.",

keywords = "Galaxies: active, Galaxies: general, Galaxies: individual: NGC 1534, Radio continuum: galaxies, Techniques: interferometric",

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

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T1 - Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the murchison widefield array

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 - 2015/3/1

Y1 - 2015/3/1

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 <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.

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 <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.

KW - Galaxies: active

KW - Galaxies: general

KW - Galaxies: individual: NGC 1534

KW - Radio continuum: galaxies

KW - Techniques: interferometric

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ER -

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

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Keywords

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