LOFAR MSSS: Discovery of a 2.56 Mpc giant radio galaxy associated with a disturbed galaxy group

Alex Clarke; G. Heald; T. Jarrett; Justin Bray; Martin Hardcastle; Therese Cantwell; Anna Scaife; M Brienza; A Bonafede; Rene Breton; J W Broderick; D Carbone; J H Croston; J S Farnes; J. J. Harwood; V Heesen; A Horneer; A. J. van der Horst; M Iacobelli; W Jurusik; G Kokotanekov; J P McKean; L. K. Morabito; David Mulcahy; B.S. Nikiel-Wroczynski; E Orru; R Paladino; M Pandey-Pommier; M Pietka; R Pizzo; L Pratley; Christopher Riseley; H J A Rottgering; A. Rowlinson; J Sabater; K Sendlinger; A Shulevski; S Sridhar; A. J. Stewart; C Tasse; S van Velzen; R J van Weeren; M W Wise

doi:10.1051/0004-6361/201630152

LOFAR MSSS: Discovery of a 2.56 Mpc giant radio galaxy associated with a disturbed galaxy group

Alex Clarke, G. Heald, T. Jarrett, Justin Bray, Martin Hardcastle, Therese Cantwell, Anna Scaife, M Brienza, A Bonafede, Rene Breton, J W Broderick, D Carbone, J H Croston, J S Farnes, J. J. Harwood, V Heesen, A Horneer, A. J. van der Horst, M Iacobelli, W JurusikG Kokotanekov, J P McKean, L. K. Morabito, David Mulcahy, B.S. Nikiel-Wroczynski, E Orru, R Paladino, M Pandey-Pommier, M Pietka, R Pizzo, L Pratley, Christopher Riseley, H J A Rottgering, A. Rowlinson, J Sabater, K Sendlinger, A Shulevski, S Sridhar, A. J. Stewart, C Tasse, S van Velzen, R J van Weeren, M W Wise

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Abstract

We report on the discovery in the LOFAR Multifrequency Snapshot Sky Survey (MSSS) of a giant radio galaxy (GRG) with a projected size of 2:56 0:07 Mpc projected on the sky. It is associated with the galaxy triplet UGC9555, within which one is identified as a broad-line galaxy in the Sloan Digital Sky Survey (SDSS) at a redshift of 0:05453 1 10􀀀5, and with a velocity dispersion of 215:86 6:34 km/s. From archival radio observations we see that this galaxy hosts a compact flat-spectrum radio source, and we conclude that it is the active galactic nucleus (AGN) responsible for generating the radio lobes. The radio luminosity distribution of the jets, and the broad-line classification of the host AGN, indicate this GRG is orientated well out of the plane of the sky, making its physical size one of the largest known for any GRG. Analysis of the infrared
data suggests that the host is a lenticular type galaxy with a large stellar mass (log M=M = 11:56 0:12), and a moderate star formation rate (1:2 0:3 M=year). Spatially smoothing the SDSS images shows the system around UGC9555 to be significantly disturbed, with a prominent extension to the south-east. Overall, the evidence suggests this host galaxy has undergone one or more recent moderate merger events and is also experiencing tidal interactions with surrounding galaxies, which have caused the star formation and provided the supply of gas to trigger and fuel the Mpc-scale radio lobes.

Original language	English
Journal	Astronomy & Astrophysics
Volume	601
Early online date	24 Apr 2017
DOIs	https://doi.org/10.1051/0004-6361/201630152
Publication status	Published - 2017

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Clarke, A., Heald, G., Jarrett, T., Bray, J., Hardcastle, M., Cantwell, T., Scaife, A., Brienza, M., Bonafede, A., Breton, R., Broderick, J. W., Carbone, D., Croston, J. H., Farnes, J. S., Harwood, J. J., Heesen, V., Horneer, A., van der Horst, A. J., Iacobelli, M., ... Wise, M. W. (2017). LOFAR MSSS: Discovery of a 2.56 Mpc giant radio galaxy associated with a disturbed galaxy group. Astronomy & Astrophysics, 601. Advance online publication. https://doi.org/10.1051/0004-6361/201630152

@article{dab71eee76d04d1c867c2df4ea6519d5,

title = "LOFAR MSSS: Discovery of a 2.56 Mpc giant radio galaxy associated with a disturbed galaxy group",

abstract = "We report on the discovery in the LOFAR Multifrequency Snapshot Sky Survey (MSSS) of a giant radio galaxy (GRG) with a projected size of 2:56 0:07 Mpc projected on the sky. It is associated with the galaxy triplet UGC9555, within which one is identified as a broad-line galaxy in the Sloan Digital Sky Survey (SDSS) at a redshift of 0:05453 1 10􀀀5, and with a velocity dispersion of 215:86 6:34 km/s. From archival radio observations we see that this galaxy hosts a compact flat-spectrum radio source, and we conclude that it is the active galactic nucleus (AGN) responsible for generating the radio lobes. The radio luminosity distribution of the jets, and the broad-line classification of the host AGN, indicate this GRG is orientated well out of the plane of the sky, making its physical size one of the largest known for any GRG. Analysis of the infrareddata suggests that the host is a lenticular type galaxy with a large stellar mass (log M=M = 11:56 0:12), and a moderate star formation rate (1:2 0:3 M=year). Spatially smoothing the SDSS images shows the system around UGC9555 to be significantly disturbed, with a prominent extension to the south-east. Overall, the evidence suggests this host galaxy has undergone one or more recent moderate merger events and is also experiencing tidal interactions with surrounding galaxies, which have caused the star formation and provided the supply of gas to trigger and fuel the Mpc-scale radio lobes.",

author = "Alex Clarke and G. Heald and T. Jarrett and Justin Bray and Martin Hardcastle and Therese Cantwell and Anna Scaife and M Brienza and A Bonafede and Rene Breton and Broderick, {J W} and D Carbone and Croston, {J H} and Farnes, {J S} and Harwood, {J. J.} and V Heesen and {Horne er}, A and {van der Horst}, {A. J.} and M Iacobelli and W Jurusik and G Kokotanekov and McKean, {J P} and Morabito, {L. K.} and David Mulcahy and B.S. Nikiel-Wroczynski and E Orru and R Paladino and M Pandey-Pommier and M Pietka and R Pizzo and L Pratley and Christopher Riseley and Rottgering, {H J A} and A. Rowlinson and J Sabater and K Sendlinger and A Shulevski and S Sridhar and Stewart, {A. J.} and C Tasse and {van Velzen}, S and {van Weeren}, {R J} and Wise, {M W}",

year = "2017",

doi = "10.1051/0004-6361/201630152",

language = "English",

volume = "601",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Clarke, A, Heald, G, Jarrett, T, Bray, J, Hardcastle, M, Cantwell, T, Scaife, A, Brienza, M, Bonafede, A, Breton, R, Broderick, JW, Carbone, D, Croston, JH, Farnes, JS, Harwood, JJ, Heesen, V, Horneer, A, van der Horst, AJ, Iacobelli, M, Jurusik, W, Kokotanekov, G, McKean, JP, Morabito, LK, Mulcahy, D, Nikiel-Wroczynski, BS, Orru, E, Paladino, R, Pandey-Pommier, M, Pietka, M, Pizzo, R, Pratley, L, Riseley, C, Rottgering, HJA, Rowlinson, A, Sabater, J, Sendlinger, K, Shulevski, A, Sridhar, S, Stewart, AJ, Tasse, C, van Velzen, S, van Weeren, RJ & Wise, MW 2017, 'LOFAR MSSS: Discovery of a 2.56 Mpc giant radio galaxy associated with a disturbed galaxy group', Astronomy & Astrophysics, vol. 601. https://doi.org/10.1051/0004-6361/201630152

TY - JOUR

T1 - LOFAR MSSS: Discovery of a 2.56 Mpc giant radio galaxy associated with a disturbed galaxy group

AU - Clarke, Alex

AU - Heald, G.

AU - Jarrett, T.

AU - Bray, Justin

AU - Hardcastle, Martin

AU - Cantwell, Therese

AU - Scaife, Anna

AU - Brienza, M

AU - Bonafede, A

AU - Breton, Rene

AU - Broderick, J W

AU - Carbone, D

AU - Croston, J H

AU - Farnes, J S

AU - Harwood, J. J.

AU - Heesen, V

AU - Horneer, A

AU - van der Horst, A. J.

AU - Iacobelli, M

AU - Jurusik, W

AU - Kokotanekov, G

AU - McKean, J P

AU - Morabito, L. K.

AU - Mulcahy, David

AU - Nikiel-Wroczynski, B.S.

AU - Orru, E

AU - Paladino, R

AU - Pandey-Pommier, M

AU - Pietka, M

AU - Pizzo, R

AU - Pratley, L

AU - Riseley, Christopher

AU - Rottgering, H J A

AU - Rowlinson, A.

AU - Sabater, J

AU - Sendlinger, K

AU - Shulevski, A

AU - Sridhar, S

AU - Stewart, A. J.

AU - Tasse, C

AU - van Velzen, S

AU - van Weeren, R J

AU - Wise, M W

PY - 2017

Y1 - 2017

N2 - We report on the discovery in the LOFAR Multifrequency Snapshot Sky Survey (MSSS) of a giant radio galaxy (GRG) with a projected size of 2:56 0:07 Mpc projected on the sky. It is associated with the galaxy triplet UGC9555, within which one is identified as a broad-line galaxy in the Sloan Digital Sky Survey (SDSS) at a redshift of 0:05453 1 10􀀀5, and with a velocity dispersion of 215:86 6:34 km/s. From archival radio observations we see that this galaxy hosts a compact flat-spectrum radio source, and we conclude that it is the active galactic nucleus (AGN) responsible for generating the radio lobes. The radio luminosity distribution of the jets, and the broad-line classification of the host AGN, indicate this GRG is orientated well out of the plane of the sky, making its physical size one of the largest known for any GRG. Analysis of the infrareddata suggests that the host is a lenticular type galaxy with a large stellar mass (log M=M = 11:56 0:12), and a moderate star formation rate (1:2 0:3 M=year). Spatially smoothing the SDSS images shows the system around UGC9555 to be significantly disturbed, with a prominent extension to the south-east. Overall, the evidence suggests this host galaxy has undergone one or more recent moderate merger events and is also experiencing tidal interactions with surrounding galaxies, which have caused the star formation and provided the supply of gas to trigger and fuel the Mpc-scale radio lobes.

AB - We report on the discovery in the LOFAR Multifrequency Snapshot Sky Survey (MSSS) of a giant radio galaxy (GRG) with a projected size of 2:56 0:07 Mpc projected on the sky. It is associated with the galaxy triplet UGC9555, within which one is identified as a broad-line galaxy in the Sloan Digital Sky Survey (SDSS) at a redshift of 0:05453 1 10􀀀5, and with a velocity dispersion of 215:86 6:34 km/s. From archival radio observations we see that this galaxy hosts a compact flat-spectrum radio source, and we conclude that it is the active galactic nucleus (AGN) responsible for generating the radio lobes. The radio luminosity distribution of the jets, and the broad-line classification of the host AGN, indicate this GRG is orientated well out of the plane of the sky, making its physical size one of the largest known for any GRG. Analysis of the infrareddata suggests that the host is a lenticular type galaxy with a large stellar mass (log M=M = 11:56 0:12), and a moderate star formation rate (1:2 0:3 M=year). Spatially smoothing the SDSS images shows the system around UGC9555 to be significantly disturbed, with a prominent extension to the south-east. Overall, the evidence suggests this host galaxy has undergone one or more recent moderate merger events and is also experiencing tidal interactions with surrounding galaxies, which have caused the star formation and provided the supply of gas to trigger and fuel the Mpc-scale radio lobes.

U2 - 10.1051/0004-6361/201630152

DO - 10.1051/0004-6361/201630152

M3 - Article

SN - 0004-6361

VL - 601

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

ER -

LOFAR MSSS: Discovery of a 2.56 Mpc giant radio galaxy associated with a disturbed galaxy group

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