Remnant radio-loud AGN in the Herschel-ATLAS field
Remnant radio-loud AGN in the Herschel-ATLAS field
复制标题
赫歇尔-阿特拉斯场中残留的无线电响度活动星系核
DOI:
10.1093/mnras/sty025
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发表时间:
2018
影响因子:
4.8
通讯作者:
Mahatma V
中科院分区:
文献类型:
--
作者:
Mahatma V
Only a small fraction of observed active galactic nuclei (AGN) display large-scale radio emission associated with jets, yet these radio-loud AGN have become increasingly important in models of galaxy evolution. In determining the dynamics and energetics of the radio sources over cosmic time, a key question concerns what happens when their jets switch off. The resulting ‘remnant' radio-loud AGN have been surprisingly evasive in past radio surveys, and therefore statistical information on the population of radio-loud AGN in their dying phase is limited. In this paper, with the recent developments of Low-Frequency Array (LOFAR) and the Very Large Array, we are able to provide a systematically selected sample of remnant radio-loud AGN in the Herschel-ATLAS field. Using a simple core-detection method, we constrain the upper limit on the fraction of remnants in our radio-loud AGN sample to 9 per cent, implying that the extended lobe emission fades rapidly once the core/jets turn off. We also find that our remnant sample has a wide range of spectral indices (), confirming that the lobes of some remnants may possess flat spectra at low frequencies just as active sources do. We suggest that, even with the unprecedented sensitivity of LOFAR, our sample may still only contain the youngest of the remnant population.
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影响因子:
4.8
作者:
R. Subrahmanyan;L. Saripalli;R. Hunstead
通讯作者:
R. Hunstead
DOI:
10.1111/j.1365-2966.2011.18346.x
发表时间:
2011
期刊:
arXiv: Cosmology and Nongalactic Astrophysics
影响因子:
--
作者:
D. Kozieł;G. Stasi'nska
通讯作者:
G. Stasi'nska
DOI:
10.1111/j.1365-2966.2008.13162.x
发表时间:
2008-02
影响因子:
4.8
作者:
J. Croston;M. Hardcastle;M. Birkinshaw;D. Worrall;R. Laing
通讯作者:
J. Croston;M. Hardcastle;M. Birkinshaw;D. Worrall;R. Laing
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
E. Orrù;E. Orrù;S. Velzen;S. Velzen;R. Pizzo;S. Yatawatta;S. Yatawatta;R. Paladino;R. Paladino;M. Iacobelli;M. Murgia;H. Falcke;H. Falcke;H. Falcke;R. Morganti;R. Morganti;A. Bruyn;A. Bruyn;C. Ferrari;James M. Anderson;A. Bonafede;D. Mulcahy;A. Asgekar;A. Asgekar;I. Avruch;R. Beck;Morag Bell;I. V. Bemmel;I. V. Bemmel;M. Bentum;M. Bentum;G. Bernardi;P. Best;F. Breitling;J. Broderick;M. Brüggen;H. Butcher;B. Ciardi;J. Conway;A. Corstanje;E. D. Geus;A. Deller;S. Duscha;J. Eislöffel;D. Engels;W. Frieswijk;M. A. Garrett;M. A. Garrett;J. Grießmeier;A. Gunst;J. Hamaker;G. Heald;M. Hoeft;A. V. D. Horst;H. Intema;H. Intema;E. Juette;J. Kohler;V. Kondratiev;V. Kondratiev;M. Kuniyoshi;G. Kuper;M. Loose;P. Maat;G. Mann;S. Markoff;R. McFadden;D. McKay;D. McKay;G. Miley;J. Moldón;G. Molenaar;H. Munk;A. Nelles;H. Paas;M. Pandey;V. Pandey;G. Pietka;A. Polatidis;W. Reich;H. Röttgering;A. Rowlinson;A. Scaife;A. Schoenmakers;D. Schwarz;M. Serylak;A. Shulevski;A. Shulevski;O. Smirnov;M. Steinmetz;A. I. F. Stewart;J. Swinbank;M. Tagger;C. Tasse;S. Thoudam;M. C. Toribio;R. Vermeulen;C. Vocks;R. Weeren;R. Wijers;M. Wise;M. Wise;O. Wucknitz
通讯作者:
O. Wucknitz
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
J. F. Basson;P. Alexander
通讯作者:
P. Alexander