Investigating the Nature of MGRO J1908+06 with Multiwavelength Observations

Li, Jian and Liu, Ruo-Yu and de Oña Wilhelmi, Emma and Torres, Diego F. and Liu, Qian-Cheng and Kerr, Matthew and Bühler, Rolf and Su, Yang and He, Hao-Ning and Xiao, Meng-Yuan (2021) Investigating the Nature of MGRO J1908+06 with Multiwavelength Observations. The Astrophysical Journal Letters, 913 (2). L33. ISSN 2041-8205

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Abstract

The unidentified TeV source MGRO J1908+06, with emission extending from hundreds of GeV to beyond 100 TeV, is one of the most intriguing sources in the Galactic plane. MGRO J1908+06 spatially associates with an IceCube hotspot of neutrino emission. Although the hotspot is not significant yet, this suggests a possible hadronic origin of the observed gamma-ray radiation. Here we describe a multiwavelength analysis on MGRO J1908+06 to determine its nature. We identify, for the first time, an extended GeV source as the counterpart of MGRO J1908 + 06, discovering possibly associated molecular clouds (MCs). The GeV spectrum shows two well-differentiated components: a soft spectral component below ∼10 GeV, and a hard one (Γ ∼ 1.6) above these energies. The lower-energy part is likely associated with the dense MCs surrounding the supernova remnant (SNR) G40.5−0.5, whereas the higher-energy component, which connects smoothly with the spectrum observed in TeV range, resembles the inverse Compton emission observed in relic pulsar wind nebulae. This simple scenario seems to describe the data satisfactorily, but raises questions about the interpretation of the emission at hundreds of TeV. In this scenario, no detectable neutrino flux would be expected.

Item Type: Article
Subjects: Middle East Library > Physics and Astronomy
Depositing User: Unnamed user with email support@middle-eastlibrary.com
Date Deposited: 10 May 2023 08:48
Last Modified: 19 Sep 2024 09:38
URI: http://editor.openaccessbook.com/id/eprint/770

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