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
Delhaize J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Delhaize J

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我们报告发现两个新的巨型射电星系(GRG)使用MeerKAT国际GHz分层河外星系探测(MIGHTEE)调查。这两个GRG都在COSMOS场内的adeg2区域内发现。它们的红移分别为z = 0.1656和z = 0.3363,物理尺寸分别为2.4和2.0Mpc。在以前的高分辨率甚大阵观测中,只有这些GRG的核心清晰可见,因为叶的漫射发射被分辨出来了。然而,新的MeerKAT望远镜出色的灵敏度和覆盖范围使这种扩散发射被检测到。GRG占据了无线电功率大小参数空间的未填充区域。根据最近对GRG数密度的估计,假设泊松统计,在adeg2场中找到两个或更多个大尺寸atz< 0.4的GRG的概率只有2.7 × 10−6。这支持了一个假设,即GRG的流行率在过去被显著低估,这是由于对低表面亮度发射的敏感性有限。这里介绍的两个GRG可能是通过像MIGHTEE这样的调查揭示的新群体中的第一个,这些调查提供了对扩散,扩展发射的灵敏度。
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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