天文現象及活動

04時25分，穀神星在月球北面2.25度。

SEMINAR:- Cosmology from Gravitational Lens Time Delays

Strong gravitational lens systems with time delays between the multiple images are a powerful probe of cosmology and astrophysics. In particular, the time-delay distance from such a system is primarily sensitive to the Hubble constant (H0) that is key to probing dark energy, neutrino physics, and the spatial curvature of the Universe, as well as discovering new physics. The H0 Lenses In COSMOGRAIL’s Wellspring (H0LiCOW) project aims to measure H0 to <3.5% precision from five lensed quasars using deep Hubble Space Telescope imaging, precise time delay measurements from the COSMOGRAIL monitoring project, a measurement of the velocity dispersion of the lens galaxies, and a characterization of the mass distribution along the line of sight. The most recent H0LiCOW analysis of the system HE 0435-1223 is able to constrain the time-delay distance to a precision of ~8%. In combination with the previous two H0LiCOW lenses, we constrain H0 to ~3.8% precision for a flat Lambda CDM cosmology. These results are consistent with independent determinations of H0 using the distance ladder method and 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.　
　
時間：2017.03.31(五) 13:30 ~ 14:15
地點：香港中文大學 科學館北座311室
講者：黃活生 博士 Dr. Kenneth WONG (日本國立天文台)
語言：英語

免費會議，歡迎參加

#77

此活動由香港中文大學物理系主辦。

SEMINAR of RPg Student:- Planetary Nebulae in our Galaxy with Emphasis on those that Present Cluster Membership

The study of Planetary Nebulae (PNe) provides us vital clues for the science behind the formation and evolution of entire galaxies. Despite the fact that recent surveys (e.g. Parker et al. 2005) have doubled their detections, there are various issues upon these spectacular objects that remain unresolved.

To date, no extensive search for cluster PNe has ever been held in spite of their crucial role (Parker et al. 2011). The aim of the proposed project is the detection of new Planetary Nebulae in our Galaxy and especially in clusters, the verification of their cluster membership and the study of their properties with the aid of new observational techniques and modeling methods (see Parker et al. 2012a).

This study will provide us important information for both the formation and evolution of Planetary Nebulae and apparently for the ecology of our own Galaxy.　
　
時間：2017.03.31(五) 14:00
地點：香港大學 莊月明物理樓518室
講者：Vasilik FRAGKOU (香港大學)
語言：英語

免費會議，歡迎參加

#89

此活動由香港大學物理系主辦。

中學天文課程

日期：
2017.03:06(一),09(四),14(二),21(二),31(五)
2017.04:07(五),21(五),24(一),28(五)
2017.05:05(五),12(五),16(二),22(一),26(五)
2017.06:02(五),09(五),16(五),20(二)
時段：14:00 ~ 16:30

日期：2016.10.25(二) ~ 2017.06.27(二) (指定日期晚間可選)
2016.10.25(二)
2016.10:26(三),28(五)
2016.11:14(一),21(一),22(二),28(一),29(二)
2016.12:06(二),20(二),21(三)
2017.01:05(四),06(五),09(一),10(二),16(一),24(二)
2017.02:07(二),22(三),24(五)
2017.03:03(五),08(三),13(一),14(二),20(一),21(二),28(二)
2017.04:05(三),07(五),10(一),11(二),25(二)
2017.05:12(五),16(二),22(一),23(二),25(四),31(三)
2017.06:01(四),02(五),05(一),08(四),12(一),15(四),19(一),27(二)
時段：19:00 ~ 21:30

地點：荃灣荃錦公路101號 嗇色園可觀自然教育中心暨天文館

◎高中天文課程
對象： 中四至中六級物理科學生
◎日間/晚間天文活動
對象：中一至中六學生

名額：每節45

免費課程，惟不包括交通費，2016.10.03(一) 09:00起，參加者必須報名，2016.10.13(四) 13:00截止，抽籤選拔

【訊息由張詠倫提供】

此活動由可觀自然教育中心暨天文館主辦。

自然會客室：境外星夜有不同 – 南北半球、不同經緯的星夜有何不同，觀與攝下的分享。

外遊配上當地星空攝影成為熱話，有時很多朋友境外遊玩前，講者經常被問及，「我想知曉於那地可以看到甚麼境況的星夜、哪些天象？」故倒不如直接以講座形式，與大家一一無私分享個中分別，讓你不再為拍而拍，知曉自己在拍攝甚麼。

時間：2017.03.31(五) 19:30 ~ 21:30
地點：葵興健康街2-6號飛亞工業中心8字樓15室 生態協會工作室
講者：朱子亮 Mew Chu (協會客席天文導師)
名額：60

(酌量定額)收費講座：作補貼場租，參加者必須報名

#78

此活動由生態協會主辦。

時間：2017.03.30(四) 20:30 ~ 22:30
地點：嶺南大學 成龍體育館天台
對象：嶺南大學學生

免費活動，參加者必須報名

#73

此活動由嶺南大學天文學會主辦。

21時03分，火星在月球北5.48度

日期：2017.03.01(三) ~ 2017.03.31(五)
時間：圖書館開放時間
地點：長洲公共圖書館

#68

此活動由香港公共圖書館主辦。

20時32分，月球距離363853.93公里。

SEMINAR:- Cosmology from Gravitational Lens Time Delays

Strong gravitational lens systems with time delays between the multiple images are a powerful probe of cosmology and astrophysics. In particular, the time-delay distance from such a system is primarily sensitive to the Hubble constant (H0) that is key to probing dark energy, neutrino physics, and the spatial curvature of the Universe, as well as discovering new physics. The H0 Lenses In COSMOGRAIL’s Wellspring (H0LiCOW) project aims to measure H0 to <3.5% precision from five lensed quasars using deep Hubble Space Telescope imaging, precise time delay measurements from the COSMOGRAIL monitoring project, a measurement of the velocity dispersion of the lens galaxies, and a characterization of the mass distribution along the line of sight. The most recent H0LiCOW analysis of the system HE 0435-1223 is able to constrain the time-delay distance to a precision of ~8%. In combination with the previous two H0LiCOW lenses, we constrain H0 to ~3.8% precision for a flat Lambda CDM cosmology. These results are consistent with independent determinations of H0 using the distance ladder method and 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.　
　
時間：2017.03.30(四) 14:30
地點：香港大學 莊月明物理樓105室
講者：黃活生 博士 Dr. Kenneth WONG (East Asia Core Observatories Association)
語言：英語

免費會議，歡迎參加

#89

此活動由香港大學物理系主辦。