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2020天文年會
中研院天文所 國際會議廳

論文摘要

Centaurus A Observation with the Compton Spectrometer and Imager

[ Poster ]

Y.-C. Chang (Institute of Astronomy, National Tsing Hua University, Taiwan) C. Sleator (Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA) A. Zoglauer (Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA)C.-Y. Yang (Institute of Astronomy, National Tsing Hua University, Taiwan) C.-Y. Chu (Institute of Astronomy, National Tsing Hua University, Taiwan) J. A. Tomsick (Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA)) Hsiang-Kuang Chang (Institute of Astronomy, National Tsing Hua University, Taiwan)S. E. Boggs (Center for Astrophysics and Space Sciences, University of California, San Diego, CA 92093-0424)C.-H. Lin ( Institute of Physics, Academia Sinica, Taipei 11529, Taiwan)P. Jean (RAP Toulouse, 9 avenue du Colonel Roche, Toulouse, France)for the COSI Collaboration

The Compton Spectrometer and Imager (COSI) is a balloon-borne, soft gamma-ray imager, spectrometer, and polarimeter with sensitivity from 0.2 to 5 MeV[1]. COSI had a successful 46-day flight, launched from Wanaka, New Zealand, in May 2016. Centaurus A, one of the closest AGN from the Earth, was observed by COSI with about 408 ksec useful exposure time in soft γ-rays, which is the least explored regime throughout the whole electromagnetic band for this well-studied source. Since observation is severely background-dominated for a balloon-borne γ-ray telescope, the method of analysis is not straight forward. We employed a method to ensure uniform exposure in the sky area of interest.[2] We conclude that, depending on event selection criteria, Cen A requires 5~8 times more exposure time than COSI had in its 2016 balloon flight to have a 3sigma detection.