GeV γ-ray emission in the field of young massive star cluster RCW 38-Reference-Cited by-同舟云学术

GeV γ-ray emission in the field of young massive star cluster RCW 38

Published:2024-04-03 Issue:1 Volume:530 Page:1144-1150
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Ge Ting-Ting¹^ORCID,Sun Xiao-Na¹^ORCID,Yang Rui-Zhi²³⁴^ORCID,Tam Pak-Hin Thomas⁵⁶,Lu Ming-Xuan¹,Liang En-Wei¹^ORCID

Affiliation:

1. Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University , Nanning 530004 , China

2. Department of Astronomy, School of Physical Sciences, University of Science and Technology of China , Hefei, Anhui 230026 , China

3. CAS Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China , Hefei, Anhui 230026 , China

4. School of Astronomy and Space Science, University of Science and Technology of China , Hefei, Anhui 230026 , China

5. School of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082 , China

6. CSST Science Center for the Guangdong–Hong Kong–Macau Greater Bay Area, Sun Yat-sen University , Zhuhai 519082 , China

Abstract

ABSTRACT We report the detection of γ-ray emission by the Fermi Large Area Telescope towards the young massive star cluster RCW 38 in the 1–500 GeV photon energy range. We found spatially extended GeV emission towards the direction of RCW 38, which is best modelled by a Gaussian disc of 0.23° radius with a significance of the extension of ∼11.4σ. Furthermore, the spatial correlation with the ionized and molecular gas content favours the hadronic origin of the γ-ray emission. The γ-ray spectrum of RCW 38 has a relatively hard photon index of 2.44 ± 0.03, which is similar to other young massive star clusters. We argue that the diffuse GeV γ-ray emission in this region likely originates from the interaction of accelerated protons in the stellar cluster with the ambient gas.

Funder

National Natural Science Foundation of China

Publisher

Oxford University Press (OUP)

Link

https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stae930/57149426/stae930.pdf

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