MGRO J2019 +37区的射电连续谱和近红外研究
Radio continuum and near-infrared study of the MGRO J2019+37 region
摘要:
MGRO J2019+37是一个未经确认的VHE伽马射线扩展源,最初由Milagro合作组织报告为天鹅座地区最亮的TeV源。它的扩展发射可以由单一或几个来源提供动力。由AGILE发现并与PSR J2021+3651相关的GeV脉冲星AGL J2020.5+3653可能有助于MGRO J2019+37的发射,尽管GeV光谱的外推不能解释检测到的多TeV通量。我们的目标是确定扩展TeV源MGRO J2019+37领域的无线电和近红外源,并研究可能有助于其发射的潜在对应物。我们用频率为610 MHz的巨型米波射电望远镜(GMRT)测量了大约6平方度的区域。我们还观察了中心平方度的调查在近红外KS波段使用3.5米望远镜在卡拉尔阿尔托。包括一些特定领域的档案X射线观测。对一个感兴趣的射电源进行了VLBI观测。我们探索了产生MGRO J2019+37多TeV辐射的可能方案,并研究了哪些源可能是主要的粒子加速器。我们提出了一个在MGRO J2019+37领域用GMRT检测到的362个射电源的目录,以及该目录与在NIR波长下获得的一个射电源以及该地区可用的X射线观测的互相关结果。详细讨论了MGRO J2019+37的TeV辐射~1度不确定区内的一些特殊射电源,包括脉冲星PSR J2021+3651及其脉冲星风星云PWN G75.2+0.1、两个新的射电源、包含两个星团的HII区Sh 2-104和射电源NVSS J202032+363158。
英文摘要:
(abridged) MGRO J2019+37 is an unidentified extended source of VHE gamma-rays originally reported by the Milagro Collaboration as the brightest TeV source in the Cygnus region. Its extended emission could be powered by either a single or several sources. The GeV pulsar AGL J2020.5+3653, discovered by AGILE and associated with PSR J2021+3651, could contribute to the emission from MGRO J2019+37, although extrapolation of the GeV spectrum does not explain the detected multi-TeV flux. Our aim is to identify radio and NIR sources in the field of the extended TeV source MGRO J2019+37, and study potential counterparts that could contribute to its emission. We surveyed a region of about 6 square degrees with the Giant Metrewave Radio Telescope (GMRT) at the frequency 610 MHz. We also observed the central square degree of this survey in the NIR Ks-band using the 3.5 m telescope in Calar Alto. Archival X-ray observations of some specific fields are included. VLBI observations of an interesting radio source were performed. We explored possible scenarios to produce the multi-TeV emission from MGRO J2019+37 and studied which of the sources could be the main particle accelerator. We present a catalogue of 362 radio sources detected with the GMRT in the field of MGRO J2019+37, and the results of a cross-correlation of this catalog with one obtained at NIR wavelengths, as well as with available X-ray observations of the region. Some peculiar sources inside the ~1 degree uncertainty region of the TeV emission from MGRO J2019+37 are discussed in detail, including the pulsar PSR J2021+3651 and its pulsar wind nebula PWN G75.2+0.1, two new radio-jet sources, the HII region Sh 2-104 containing two star clusters, and the radio source NVSS J202032+363158.
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