Diffuse sources, clustering, and the excess anisotropy of the radio synchrotron background
Diffuse sources, clustering, and the excess anisotropy of the radio synchrotron background
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射电同步加速器背景的漫射源、聚类和过度各向异性
DOI:
10.1093/mnras/stad1671
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发表时间:
2023
影响因子:
4.8
通讯作者:
Lucero, D. M.
中科院分区:
文献类型:
--
作者:
Cowie, F. J.;Offringa, A. R.;Gehlot, B. K.;Singal, J.;Heston, S.;Horiuchi, S.;Lucero, D. M.
We present the largest low frequency (120 MHz) arcminute resolution image of the radio synchrotron background (RSB) to date, and its corresponding angular power spectrum of anisotropies (APS) with angular scales ranging from 3° to 0.3 arcmin. We show that the RSB around the north celestial pole has a significant excess anisotropy power at all scales over a model of unclustered point sources based on source counts of known source classes. This anisotropy excess, which does not seem attributable to the diffuse Galactic emission, could be linked to the surface brightness excess of the RSB. To better understand the information contained within the measured APS, we model the RSB varying the brightness distribution, size, and angular clustering of potential sources. We show that the observed APS could be produced by a population of faint clustered point sources only if the clustering is extreme and the size of the Gaussian clusters is ≲1 arcmin. We also show that the observed APS could be produced by a population of faint diffuse sources with sizes ≲1 arcmin, and this is supported by features present in our image. Both of these cases would also cause an associated surface brightness excess. These classes of sources are in a parameter space not well probed by even the deepest radio surveys to date.
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DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
C. Blake;P. Ferreira;J. Borrill
通讯作者:
J. Borrill
影响因子:
4.8
作者:
A. Offringa;A. Offringa;Florent Mertens;L. Koopmans
通讯作者:
L. Koopmans
影响因子:
4.8
作者:
W. Williams;W. Williams;W. Williams;R. V. Weeren;H. Röttgering;P. Best;T. J. Dijkema;F. Gasperin;M. Hardcastle;G. Heald;G. Heald;I. Prandoni;J. Sabater;T. Shimwell;C. Tasse;I. V. Bemmel;M. Brüggen;G. Brunetti;J. Conway;T. Ensslin;D. Engels;H. Falcke;H. Falcke;C. Ferrari;M. Haverkorn;M. Haverkorn;N. Jackson;M. Jarvis;A. Kapinska;A. Kapinska;E. Mahony;G. Miley;L. Morabito;R. Morganti;R. Morganti;E. Orr'u;E. Retana;S. S. Sridhar;S. S. Sridhar;M. C. Toribio;G. White;G. White;M. Wise;M. Wise;J. Zwart;J. Zwart
通讯作者:
J. Zwart
DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
R. Subrahmanyan;M. Kesteven;R. Ekers;M. Sinclair;J. S. Atnf;Australia.;Rri;India.;Ucb
通讯作者:
Ucb
影响因子:
4.8
作者:
A. M. Sardarabadi;L. Koopmans
通讯作者:
A. M. Sardarabadi;L. Koopmans