Study of Wide-Field-of-View X-ray Observations of the Virgo Cluster Using the Lobster Eye Imager for Astronomy

Author:

Feng Wen-Cheng12ORCID,Jia Shu-Mei2ORCID,Zhao Hai-Hui1ORCID,Yu Heng3ORCID,Pan Hai-Wu4,Li Cheng-Kui2ORCID,Cheng Yu-Lin5ORCID,Weng Shan-Shan1ORCID,Chen Yong2,Liu Yuan4ORCID,Ling Zhi-Xing4,Zhang Chen4

Affiliation:

1. Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023, China

2. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

3. Department of Astronomy, Beijing Normal University, Beijing 100875, China

4. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China

5. Department of Astronomy, Yunnan University, Kunming 650091, China

Abstract

The Lobster Eye Imager for Astronomy (LEIA) is the pathfinder of the wide-field X-ray telescope used in the Einstein Probe mission. In this study, we present an image of the Virgo Cluster taken by LEIA in the 0.5–4.5 keV band with an exposure time of ∼17.3 ks in the central region. This extended emission is generally consistent with the results obtained by ROSAT. However, the field is affected by bright point sources due to the instrument’s Point Spread Function (PSF) effect. Through fitting of the LEIA spectrum of the Virgo Cluster, we obtained a temperature of 2.1−0.1+0.3 keV, which is consistent with the XMM-Newton results (∼2.3 keV). Above 1.6 keV, the spectrum is dominated by the X-ray background. In summary, this study validates LEIA’s extended source imaging and spectral resolution capabilities for the first time.

Funder

Strategic Pioneer Program on Space Science, Chinese Academy of Sciences

National Natural Science Foundation of China

National Science Foundation

National Aeronautics and Space Administration’s Earth Science Technology Office

Publisher

MDPI AG

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