MIGHTEE: are giant radio galaxies more common than we thought?
MIGHTEE: are giant radio galaxies more common than we thought?
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MIGHTEE:巨型射电星系比我们想象的更常见吗?
DOI:
10.1093/mnras/staa3837
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发表时间:
2021
影响因子:
4.8
通讯作者:
Delhaize J
中科院分区:
文献类型:
--
作者:
Delhaize J
We report the discovery of two new giant radio galaxies (GRGs) using the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey. Both GRGs were found within adeg2region inside the COSMOS field. They have redshifts ofz= 0.1656 andz= 0.3363 and physical sizes of 2.4 and 2.0 Mpc, respectively. Only the cores of these GRGs were clearly visible in previous high-resolution Very Large Array observations, since the diffuse emission of the lobes was resolved out. However, the excellent sensitivity anduvcoverage of the new MeerKAT telescope allowed this diffuse emission to be detected. The GRGs occupy an unpopulated region of radio power – size parameter space. Based on a recent estimate of the GRG number density, the probability of finding two or more GRGs with such large sizes atz< 0.4 in adeg2field is only 2.7 × 10−6, assuming Poisson statistics. This supports the hypothesis that the prevalence of GRGs has been significantly underestimated in the past due to limited sensitivity to low surface brightness emission. The two GRGs presented here may be the first of a new population to be revealed through surveys like MIGHTEE that provide exquisite sensitivity to diffuse, extended emission.
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DOI:
10.1093/mnras/stab104
发表时间:
2019
期刊:
arXiv: Instrumentation and Methods for Astrophysics
影响因子:
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作者:
K. Asad;J. Girard;M. de Villiers;T. Ansah;K. Iheanetu;O. Smirnov;M. G. Santos;R. Lehmensiek;J. Jonas;D. I. L. de Villiers;K. Thorat;B. Hugo;S. Makhathini;G. Józsa;S. Sirothia
通讯作者:
S. Sirothia
DOI:
10.1051/0004-6361:20010254
发表时间:
2001
期刊:
arXiv: Astrophysics
影响因子:
--
作者:
L. Lara;W. D. Cotton;L. Feretti;G. Giovannini;J. Marcaide;I. Márquez;T. Venturi
通讯作者:
T. Venturi
DOI:
10.3847/0067-0049/224/2/24
发表时间:
2016-04
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
作者:
C. Laigle;H. McCracken;O. Ilbert;B. Hsieh;I. Davidzon;P. Capak;G. Hasinger;J. Silverman;C. Pi
通讯作者:
C. Laigle;H. McCracken;O. Ilbert;B. Hsieh;I. Davidzon;P. Capak;G. Hasinger;J. Silverman;C. Pi
DOI:
--
发表时间:
2020
期刊:
影响因子:
--
作者:
C. Ishwara;C. Ishwara;A. Taylor;A. Taylor;D. Green;J. Stil;Mattia Vaccari;Mattia Vaccari;E. Ocran
通讯作者:
E. Ocran
DOI:
10.1046/j.1365-8711.2003.06605.x
发表时间:
2003-03
影响因子:
4.8
作者:
T. Mauch;T. Murphy;H. Buttery;J. Curran;R. Hunstead;B. Piestrzynski;J. Robertson;E. B. G. U. O. Sydney;U. Cambridge
通讯作者:
T. Mauch;T. Murphy;H. Buttery;J. Curran;R. Hunstead;B. Piestrzynski;J. Robertson;E. B. G. U. O. Sydney;U. Cambridge