경북대학교 물리학과

  • 학과소개
  • 학사
  • 사람들
  • 연구
  • 자료실
  • 동문
  • 취업정보
  • 커뮤니티

경북대학교 물리학과 COMMUNITY 커뮤니티

+ 공지사항
+ 세미나/콜로퀴엄
+ 학과소식
+ 학부생 게시판
+ 대학원생 게시판
+ 일반&수험생 상담
+ 자유게시판

QUICK MENU

  • 웹메일
  • 포털시스템
  • 통합정보시스템
  • 기초교육원
  • 어학교육원
  • 캠퍼스맵

HOME>>커뮤니티>>세미나/콜로퀴엄

세미나/콜로퀴엄


첨부파일 :     Downloading : 44 - 콜로퀴움2.bmp
글제목 :     The Relative and Absolute LGRB Rate with Metallically and Its Lack of Evolution
일시 :     2017년 8월 30일 (수) 오후 4:30
장소 :     제1과학관 119호
연사 :     Dr. John Graham(Kavli Institute for Astronomy and Astrophysics at Peking University, China)
 
p 제목: The Relative and Absolute LGRB Rate with Metallically and Its Lack of Evolution
p 연사: Dr. John Graham
         (Kavli Institute for Astronomy and Astrophysics at Peking University, China)
p 일시: 2017년 8월 30일 (수) 오후 4:30
p 장소: 제1과학관 119호
p 요약:
There is now strong evidence that Long-duration Gamma-Ray Bursts (LGRBs) have an intrinsic preference for low-metallicity environments despite the existence of some exceptions to this trend (Graham & Fruchter 2013). Here I will present a pair of results expanding on this work. First we will use the sample from Graham and Fruchter 2013 to give a quantitative answer to the fundamental question: How much more likely is an LGRB to form at one metallicity to another  In particular, we find that per unit star-formation an LGRB occurs about 30 times more often at metallicities below 8.3 on the KK04 scale than above. Then, employing this result and the work of Lien et al. 2014, we relate the LGRB rate as a function of redshift to the cosmic star-formation rate, and show that assuming a semi-nominal LGRB beaming factor of 100, in low-metallicity environments one LGRB occurs for approximately every 40 broad-lined Type Ic SNe.  However the metallicity distribution of LGRB host galaxies shows a curious lack of evolution with redshift seen in both host galaxies with measured metallicities and the expected metallicities of LGRB host given their mass and redshift.  We also find that the metallicities estimated from mass and redshift are about twice as metal rich as the population with actually measured values which resolves much of the difference between the LGRB formation metallicity cutoff of about a third solar in Graham & Fruchter 2015 with the cutoff value of solar claimed in Perley et al. 2016 in favor of the former.
학생들의 많은 참여 바랍니다.
 
 
이전글 목록 새글쓰기 응답글쓰기 글수정하기 글지우기 다음글



335 석학초청 콜로퀴움) Trend of CMOS pixel sensors for subatomic physics and connection to scientific imaging2018.12.1257
334 콜로퀴움) 1차원 나노 결정의 성장2018.11.29144
333 콜로퀴움) 힉스와 암흑물질2018.11.23192
332 2018학년도 2학기 대학원 박사학위논문 공개발표 안내(IV)2018.11.19220
331 2018학년도 2학기 대학원 박사학위논문 공개발표 안내(III)2018.11.19178
330 2018학년도 2학기 대학원 박사학위논문 공개발표 안내(II)2018.11.19142
329 콜로퀴움) Deep learning at the LHC2018.11.19112
328 2018학년도 2학기 대학원 석사학위논문 공개발표 안내2018.11.15167
327 2018학년도 2학기 대학원 박사학위논문 공개발표 안내(I)2018.11.15153
326 콜로퀴움) Axion dark matter: Cosmic hide-and-seek2018.11.06169
325 콜로퀴움) MEDICAL AND INDUTRIAL APPLICATIONS OF RADIOACTIVE ISOTOPES2018.11.05149
324 콜로퀴움) 한국 중성미자 관측소2018.10.24268
323 콜로퀴움) Quantum Magnetism for the Next Generation!2018.10.08631
322 콜로퀴움) Ultra Short Pulsed Laser for the Next Generation Electronics2018.09.28792
321 콜로퀴움) Hyperpolarization Researches with NV center, 129Xe, and Parahydrogen2018.09.191119
320 콜로퀴움) Silicon sensors and their applications in astro-particle physics2018.09.191017
319 콜로퀴움) 기계공학과 의생명공학 융합을 통한 암의 진단 및 치료2018.09.141031
318 콜로퀴움) Optical process for nanomaterial2018.09.071082
317 2018학년도 2학기 물리학과 콜로퀴움 안내2018.09.071117
316 *동문초청 취업/진로 멘토링*(과학수사와 물리학 : 물리학의 활용성)2018.09.031173
 1 [2][3][4][5][6][7][8][9][10] ▷▷
목록 새글쓰기




Kyungpook National University Department of Physics
#702-701 대구광역시 북구 산격동 1370번지 경북대학교 자연과학대학 물리학과 / Tel. 053-950-5316 / Fax. 053-952-1739 Copyrights 2011 KNU Department of Physics. All rights reserved. Designed by DMAX
페이스북 트위터