4C+29.48是否为gamma-ray源？
Is 4C+29.48 a gamma-ray source?
摘要：
费米大面积望远镜显示，河外伽马射线天空主要是耀变体，活动星系核（AGN）的喷流与视线的角度非常小。为了将伽马射线源联系起来，然后进行分类，从低频勘测和观测中收集了数据。伽马射线源3FGL J1323.0+2942与射电源4C+29.48有关，被归类为未知类型的耀变体，缺乏光谱和红移。更高分辨率的射电数据显示，4C+29.48包括三个明亮的射电发射特征，位于直径约1 '的区域内。我们（重新）分析了由甚长基线阵列和欧洲VLBI网络4C+29.48进行的归档甚大阵列和未发表的甚长基线干涉测量（VLBI）观测。我们还收集了光学、红外和X射线测量的数据。4C+29.48的最北端的复合体包含一个具有高亮度温度致密核心和陡光谱喷流特征的耀变体。耀变体的位置与红移为1.142的光源重合。它的中红外颜色也支持它与伽马射线发射耀变体的关联。另外两个射电复合体具有陡峭的射电频谱，在目前可用的调查中没有光学或红外对应物。根据射电形态，它们不太可能与耀变体有关。我们讨论的可能性是否两个无线电功能是一个无线电星系的瓣，或引力透镜图像的背景源。我们建议在费米星表的后续版本中将3FGL J1323.0+2942与位于最北端的blazar相关联。我们建议将这个射电源命名为J1323+2941A，以避免由于目前列出的无线电对应物4C+29.48的坐标更接近于一个最可能无关的射电源而引起的误解。（节略）
英文摘要：
The Fermi Large Area Telescope revealed that the extragalactic gamma-ray sky is dominated by blazars, active galactic nuclei (AGN) whose jet is seen at very small angle to the line of sight. To associate and then classify the gamma-ray sources, data have been collected from lower frequency surveys and observations. The gamma-ray source 3FGL J1323.0+2942 is associated with the radio source 4C+29.48 and classified as a blazar of unknown type, lacking optical spectrum and redshift. The higher-resolution radio data showed that 4C+29.48 comprises three bright radio-emitting features located within a ~1'-diameter area. We (re-)analyzed archival Very Large Array and unpublished very long baseline interferometry (VLBI) observations conducted by the Very Long Baseline Array and the European VLBI Network of 4C+29.48. We also collected data form optical, infrared and X-ray surveys. The northernmost complex of 4C+29.48 contains a blazar with a high brightness temperature compact core and a steep-spectrum jet feature. The blazar is positionally coincident with an optical source at a redshift of 1.142. Its mid-infrared colors also support its association with a gamma-ray emitting blazar. The two other radio complexes have steep radio spectra and do not have optical or infrared counterparts in currently available surveys. Based on the radio morphology, they are unlikely to be related to the blazar. We discuss the possibilities whether the two radio features are lobes of a radio galaxy, or gravitationally lensed images of a background source. We propose to associate 3FGL J1323.0+2942 in subsequent versions of the Fermi catalog with the blazar residing in northernmost complex. We suggest naming this source J1323+2941A to avoid misinterpretation arising from the fact that the coordinates of the currently listed radio counterpart 4C+29.48 is closer to a most probably unrelated radio source. (abridged)
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