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By the same authors

LOFAR discovery of a 700-kpc remnant radio galaxy at low redshift

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LOFAR discovery of a 700-kpc remnant radio galaxy at low redshift. / Brienza, M.; Godfrey, L.; Morganti, R.; Vilchez, N.; Maddox, N.; Murgia, M.; Orru, E.; Shulevski, A.; Best, P. N.; Brüggen, M.; Harwood, J. J.; Jamrozy, M.; Jarvis, M. J.; Mahony, E. K.; McKean, J.; Röttgering, H. J.A.

In: Astronomy and Astrophysics, Vol. 585, No. January 2016, A29, 01.01.2016.

Research output: Contribution to journalArticlepeer-review

Harvard

Brienza, M, Godfrey, L, Morganti, R, Vilchez, N, Maddox, N, Murgia, M, Orru, E, Shulevski, A, Best, PN, Brüggen, M, Harwood, JJ, Jamrozy, M, Jarvis, MJ, Mahony, EK, McKean, J & Röttgering, HJA 2016, 'LOFAR discovery of a 700-kpc remnant radio galaxy at low redshift', Astronomy and Astrophysics, vol. 585, no. January 2016, A29. https://doi.org/10.1051/0004-6361/201526754

APA

Brienza, M., Godfrey, L., Morganti, R., Vilchez, N., Maddox, N., Murgia, M., Orru, E., Shulevski, A., Best, P. N., Brüggen, M., Harwood, J. J., Jamrozy, M., Jarvis, M. J., Mahony, E. K., McKean, J., & Röttgering, H. J. A. (2016). LOFAR discovery of a 700-kpc remnant radio galaxy at low redshift. Astronomy and Astrophysics, 585(January 2016), [A29]. https://doi.org/10.1051/0004-6361/201526754

Vancouver

Brienza M, Godfrey L, Morganti R, Vilchez N, Maddox N, Murgia M et al. LOFAR discovery of a 700-kpc remnant radio galaxy at low redshift. Astronomy and Astrophysics. 2016 Jan 1;585(January 2016). A29. https://doi.org/10.1051/0004-6361/201526754

Author

Brienza, M. ; Godfrey, L. ; Morganti, R. ; Vilchez, N. ; Maddox, N. ; Murgia, M. ; Orru, E. ; Shulevski, A. ; Best, P. N. ; Brüggen, M. ; Harwood, J. J. ; Jamrozy, M. ; Jarvis, M. J. ; Mahony, E. K. ; McKean, J. ; Röttgering, H. J.A. / LOFAR discovery of a 700-kpc remnant radio galaxy at low redshift. In: Astronomy and Astrophysics. 2016 ; Vol. 585, No. January 2016.

Bibtex

@article{c8d7714a972941d09724993a0258bf01,
title = "LOFAR discovery of a 700-kpc remnant radio galaxy at low redshift",
abstract = "Context. Remnant radio galaxies represent the final dying phase of radio galaxy evolution in which the jets are no longer active. Remnants are rare in flux-limited samples, comprising at most a few percent. As a result of their rarity and because they are difficult to identify, this dying phase remains poorly understood and the luminosity evolution is largely unconstrained. Aims. Here we present the discovery and detailed analysis of a large (700 kpc) remnant radio galaxy with a low surface brightness that has been identified in LOFAR images at 150 MHz. Methods. By combining LOFAR data with new follow-up Westerbork observations and archival data at higher frequencies, we investigated the source morphology and spectral properties from 116 to 4850 MHz. By modelling the radio spectrum, we probed characteristic timescales of the radio activity. Results. The source has a relatively smooth, diffuse, amorphous appearance together with a very weak central compact core that is associated with the host galaxy located at z = 0.051. From our ageing and morphological analysis it is clear that the nuclear engine is currently switched off or, at most, active at a very low power state. We find that the source has remained visible in the remnant phase for about 60 Myr, significantly longer than its active phase of 15 Myr, despite being located outside a cluster. The host galaxy is currently interacting with another galaxy located at a projected separation of 15 kpc and a radial velocity offset of ∼ 300 km s-1. This interaction may have played a role in the triggering and/or shut-down of the radio jets. Conclusions. The spectral shape of this remnant radio galaxy differs from most of the previously identified remnant sources, which show steep or curved spectra at low to intermediate frequencies. Our results demonstrate that remnant radio galaxies can show a wide range of evolutionary paths and spectral properties. In light of this finding and in preparation for new-generation deep low-frequency surveys, we discuss the selection criteria to be used to select representative samples of these sources.",
keywords = "Galaxies: active, Galaxies: individual: J1828+49, Radio continuum: galaxies",
author = "M. Brienza and L. Godfrey and R. Morganti and N. Vilchez and N. Maddox and M. Murgia and E. Orru and A. Shulevski and Best, {P. N.} and M. Br{\"u}ggen and Harwood, {J. J.} and M. Jamrozy and Jarvis, {M. J.} and Mahony, {E. K.} and J. McKean and R{\"o}ttgering, {H. J.A.}",
note = "{\textcopyright} ESO 2018. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1051/0004-6361/201526754",
year = "2016",
month = jan,
day = "1",
doi = "10.1051/0004-6361/201526754",
language = "English",
volume = "585",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
number = "January 2016",

}

RIS

TY - JOUR

T1 - LOFAR discovery of a 700-kpc remnant radio galaxy at low redshift

AU - Brienza, M.

AU - Godfrey, L.

AU - Morganti, R.

AU - Vilchez, N.

AU - Maddox, N.

AU - Murgia, M.

AU - Orru, E.

AU - Shulevski, A.

AU - Best, P. N.

AU - Brüggen, M.

AU - Harwood, J. J.

AU - Jamrozy, M.

AU - Jarvis, M. J.

AU - Mahony, E. K.

AU - McKean, J.

AU - Röttgering, H. J.A.

N1 - © ESO 2018. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1051/0004-6361/201526754

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Context. Remnant radio galaxies represent the final dying phase of radio galaxy evolution in which the jets are no longer active. Remnants are rare in flux-limited samples, comprising at most a few percent. As a result of their rarity and because they are difficult to identify, this dying phase remains poorly understood and the luminosity evolution is largely unconstrained. Aims. Here we present the discovery and detailed analysis of a large (700 kpc) remnant radio galaxy with a low surface brightness that has been identified in LOFAR images at 150 MHz. Methods. By combining LOFAR data with new follow-up Westerbork observations and archival data at higher frequencies, we investigated the source morphology and spectral properties from 116 to 4850 MHz. By modelling the radio spectrum, we probed characteristic timescales of the radio activity. Results. The source has a relatively smooth, diffuse, amorphous appearance together with a very weak central compact core that is associated with the host galaxy located at z = 0.051. From our ageing and morphological analysis it is clear that the nuclear engine is currently switched off or, at most, active at a very low power state. We find that the source has remained visible in the remnant phase for about 60 Myr, significantly longer than its active phase of 15 Myr, despite being located outside a cluster. The host galaxy is currently interacting with another galaxy located at a projected separation of 15 kpc and a radial velocity offset of ∼ 300 km s-1. This interaction may have played a role in the triggering and/or shut-down of the radio jets. Conclusions. The spectral shape of this remnant radio galaxy differs from most of the previously identified remnant sources, which show steep or curved spectra at low to intermediate frequencies. Our results demonstrate that remnant radio galaxies can show a wide range of evolutionary paths and spectral properties. In light of this finding and in preparation for new-generation deep low-frequency surveys, we discuss the selection criteria to be used to select representative samples of these sources.

AB - Context. Remnant radio galaxies represent the final dying phase of radio galaxy evolution in which the jets are no longer active. Remnants are rare in flux-limited samples, comprising at most a few percent. As a result of their rarity and because they are difficult to identify, this dying phase remains poorly understood and the luminosity evolution is largely unconstrained. Aims. Here we present the discovery and detailed analysis of a large (700 kpc) remnant radio galaxy with a low surface brightness that has been identified in LOFAR images at 150 MHz. Methods. By combining LOFAR data with new follow-up Westerbork observations and archival data at higher frequencies, we investigated the source morphology and spectral properties from 116 to 4850 MHz. By modelling the radio spectrum, we probed characteristic timescales of the radio activity. Results. The source has a relatively smooth, diffuse, amorphous appearance together with a very weak central compact core that is associated with the host galaxy located at z = 0.051. From our ageing and morphological analysis it is clear that the nuclear engine is currently switched off or, at most, active at a very low power state. We find that the source has remained visible in the remnant phase for about 60 Myr, significantly longer than its active phase of 15 Myr, despite being located outside a cluster. The host galaxy is currently interacting with another galaxy located at a projected separation of 15 kpc and a radial velocity offset of ∼ 300 km s-1. This interaction may have played a role in the triggering and/or shut-down of the radio jets. Conclusions. The spectral shape of this remnant radio galaxy differs from most of the previously identified remnant sources, which show steep or curved spectra at low to intermediate frequencies. Our results demonstrate that remnant radio galaxies can show a wide range of evolutionary paths and spectral properties. In light of this finding and in preparation for new-generation deep low-frequency surveys, we discuss the selection criteria to be used to select representative samples of these sources.

KW - Galaxies: active

KW - Galaxies: individual: J1828+49

KW - Radio continuum: galaxies

UR - http://www.scopus.com/inward/record.url?scp=84949679918&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201526754

DO - 10.1051/0004-6361/201526754

M3 - Article

AN - SCOPUS:84949679918

VL - 585

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

IS - January 2016

M1 - A29

ER -