arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1404.5960astro-ph.HE
收藏

揭示未识别gamma-ray源的性质V:用核密度估计分析候选射电源

Unveiling the nature of the unidentified gamma-ray sources V: analysis of the radio candidates with the kernel density estimation

F. Massaro, R. D'Abrusco, A. Paggi, N. Masetti, M. Giroletti, G. Tosti, Howard A. Smith, S. Funk

摘要:

费米探测到的近三分之一的伽马射线源仍然是未知的,尽管最近在这方面取得了重大进展。另一方面,在第二个费米-LAT星表中,所有的河外γ射线源都有一个射电对应源。出于这种观测证据,我们调查的主要无线电调查,在95%的置信水平的位置不确定性区域内的身份不明的伽马射线源(UGS)的所有无线电源。首先,我们寻找他们的红外同行在全天空的调查进行的宽视场红外巡天探测器(WISE),然后我们分析它们的红外颜色与已知的伽马射线耀变体的比较。我们提出了一种新的方法,基于一个2维核密度估计(KDE)技术在单一的[3.4]-[4.6]-[12]微米WISE颜色-颜色图,取代了我们以前的研究中施加的约束,在22微米的每个潜在的红外对应的UGS与相关的无线电发射的检测。这项分析的主要目标是找到遥远的伽马射线耀变体候选者,这些候选者在22微米时太微弱,WISE无法检测到,因此无法通过我们的纯红外方法进行选择。我们发现55个UGS可能对应于具有耀变体红外特征的射电源。另外11个具有耀变体红外颜色的UGS,在最近ATCA观测发现的深源样本中被发现。

英文摘要:

Nearly one-third of the gamma-ray sources detected by Fermi are still unidentified, despite significant recent progress in this effort. On the other hand, all the gamma-ray extragalactic sources associated in the second Fermi-LAT catalog have a radio counterpart. Motivated by this observational evidence we investigate all the radio sources of the major radio surveys that lie within the positional uncertainty region of the unidentified gamma-ray sources (UGSs) at 95% level of confidence. First we search for their infrared counterparts in the all-sky survey performed by the Wide-field Infrared Survey Explorer (WISE) and then we analyze their IR colors in comparison with those of the known gamma-ray blazars. We propose a new approach, based on a 2-dimensional kernel density estimation (KDE) technique in the single [3.4]-[4.6]-[12] micron WISE color-color plot, replacing the constraint imposed in our previous investigations on the detection at 22 micron of each potential IR counterpart of the UGSs with associated radio emission. The main goal of this analysis is to find distant gamma-ray blazar candidates that, being too faint at 22 micron, are not detected by WISE and thus are not selected by our purely IR based methods. We find fifty-five UGS's likely correspond to radio sources with blazar-like IR signatures. Additional eleven UGSs having, blazar-like IR colors, have been found within the sample of sources found with deep recent ATCA observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑