간행물
천문학회지 KCI 등재 SCOPUS Journal of The Korean Astronomical Society
- 발행기관 한국천문학회
- 자료유형 학술지
- 간기 반년간
- ISSN 1225-4614 (Print)2288-890X (Online)
- 수록기간 1968 ~ 2024
- 주제분류 자연과학 > 천문학 자연과학 분류의 다른 간행물
- 십진분류KDC 440DDC 520
권호리스트/논문검색
제54권 제3호 (2021년 6월) 2건
1.
2021.06
구독 인증기관 무료, 개인회원 유료
Myungshin Im, Yonggi Kim, Chung-Uk Lee, Hee-Won Lee, Soojong Pak, Hyunjin Shim, Hyun-Il Sung, Wonseok Kang, Taewoo Kim, Jeong-Eun Heo, Tobias C. Hinse, Masateru Ishiguro, Gu Lim, Cuc T. K. LY, Gregory S. H. Paek, Jinguk Seo, Joh-na Yoon, Jong-Hak Woo, Hojae Ahn, Hojin Cho, Changsu Choi, Jimin Han, Sungyong Hwang, Tae-Geun Ji, Seong-Kook J. Lee, Sumin Lee, Sunwoo Lee, Changgon Kim, Dohoon Kim, Joonho Kim, Sophia Kim, Mankeun Jeong, Bomi Park, Insu Paek, Dohyeong Kim, Changbom Park
Even in an era where 8-meter class telescopes are common, small telescopes are considered very valuable research facilities since they are available for rapid follow-up or long term monitoring observations. To maximize the usefulness of small telescopes in Korea, we established the SomangNet, a network of 0.4{1.0 m class optical telescopes operated by Korean institutions, in 2020. Here, we give an overview of the project, describing the current participating telescopes, its scienti c scope and operation mode, and the prospects for future activities. SomangNet currently includes 10 telescopes that are located in Australia, USA, and Chile as well as in Korea. The operation of many of these telescopes currently relies on operators, and we plan to upgrade them for remote or robotic operation. The latest SomangNet science projects include monitoring and follow-up observational studies of galaxies, supernovae, active galactic nuclei, symbiotic stars, solar system objects, neutrino/gravitational-wave sources, and exoplanets.
4,600원
2.
2021.06
구독 인증기관 무료, 개인회원 유료
The intracluster medium (ICM) is expected to experience on average about three passages of weak shocks with low sonic Mach numbers, M . 3, during the formation of galaxy clusters. Both protons and electrons could be accelerated to become high energy cosmic rays (CRs) at such ICM shocks via di usive shock acceleration (DSA). We examine the e ects of DSA by multiple shocks on the spectrum of accelerated CRs by including in situ injection/acceleration at each shock, followed by repeated re- acceleration at successive shocks in the test-particle regime. For simplicity, the accelerated particles are assumed to undergo adiabatic decompression without energy loss and escape from the system, before they encounter subsequent shocks. We show that in general the CR spectrum is attened by multiple shock passages, compared to a single episode of DSA, and that the acceleration eciency increases with successive shock passages. However, the decompression due to the expansion of shocks into the cluster outskirts may reduce the ampli cation and attening of the CR spectrum by multiple shock passages. The nal CR spectrum behind the last shock is determined by the accumulated e ects of repeated re-acceleration by all previous shocks, but it is relatively insensitive to the ordering of the shock Mach numbers. Thus multiple passages of shocks may cause the slope of the CR spectrum to deviate from the canonical DSA power-law slope of the current shock.
4,000원
