今天是   收藏本站 | 联系我们 | 上海天文台 | English
首页 研究领域 研究团组 科研人员 学术活动 工作机会 内部信息
研究领域
 
每周简讯 更多

SHAO Astrophysics Colloquium

Special Colloquium

Speaker: Kenneth Wong (National Astronomical Observatory of Japan)

Time: Jan 29 (Monday), 3pm

Location:  room 1715, 17th floor

Title: Studying the Dark Universe with Gravitational Lenses
Abstract: Strong gravitational lensing is a powerful probe of the mass distribution in the Universe.  Lensing is sensitive to the total mass distribution along the line of sight, making it a unique probe of dark matter in lensing galaxies.  However, strong lenses are quite rare and require deep wide-area imaging surveys to build up a statistical sample.  The Hyper-Suprime Cam survey is an ongoing multiband imaging survey using the Subaru Telescope that will cover 1400 deg^2 of the sky to a depth of r~26.  I present the current work of the HSC SSP strong lens working group, which is focused on searching for new lenses and leveraging these systems for studies of galaxy structure and cosmology.  The search methods and science cases being developed now for surveys such as the HSC SSP are necessary to prepare for the upcoming revolution in strong lensing from LSST and Euclid, which will discover orders of magnitude more lenses than are currently known.  Searches for lensed quasars are particularly valuable because they are variable and can be monitored to measure the "time delay" between the multiple images.  In particular, the time-delay distance from such a system is primarily sensitive to the Hubble constant (H0).  This method is independent of type Ia supernovae and CMB observations, and may shed light on the growing H0 discrepancy between local universe and CMB measurements.  I discuss the H0 Lenses In COSMOGRAIL’s Wellspring (H0LiCOW) project, which has measured H0 to ~3.8% precision for a flat Lambda CDM cosmology from three time-delay lenses. Our results are in moderate tension with the latest Planck results for a similar cosmology, hinting at possible new physics beyond the standard LCDM model and highlighting the importance of this independent probe.

 

 

 
中心简介
1.jpg
    天体物理研究室是上海天文台从事基础天体物理研究的主要机构,包括12个科研团组。研究室的研究方向涉及黑洞和高能天体物理、星系形成与演化、宇宙大尺度 结构、星团和银河系结构、恒星形成、以及行星天体物理等领域,在黑洞吸积与喷流理论、黑洞和星系的共同演化、银河系结构与动力学、计算天体物理等方向具有一定的国际影响力。研究室现有固定研究人员固定研究人员46名,博士后11名,研究生65名。固定研究人员中包括国家杰出青年基金获得者3人、优秀青年基金获得者2人、科学院“百人计划”入选者9人。
    研究室与国内外的天文研究机构有着密切的合作关系,与中国科技大学联合成立了“中国科学院星系和宇宙学重点实验室”,与厦门大学成立了天体物理联合中心。研究室还参与了多项国际、国内天文项目和观测计划,如LAMOST、HXMT、SDSS-IV、TMT、LSST、FAST等。
©2008-2013 中国科学院上海天文台 版权所有
地址:上海市南丹路80号 邮编:200030 邮件:shao@shao.ac.cn