Category Archives: 天文現象及活動

恆星高生成原星系環境內大規模物質流與宇宙射線加熱


Seminar:- Large-Scale Outflows from Starforming Galaxies and Cosmic-Ray Heating in Protogalactic Environments

Galaxies with strong star-forming activity are found to have large-scale outflows. These outflows are multi-phase, multi-component media, consisting of a mixture of ionised and neutral gases, in the form of bubbles and clamps respectively. The flows are often laden with particles, such as dusts, and are permeated by tangled magnetic fields. These flows are complicated. Protogalaxies with strong formation are expected to show large-scale outflows. These galaxies undergo strong star-forming processes, which lead to frequent supernova events. The supernova explosions not only supply the energy to drive the galactic outflows but also generate shocks and accelerate charged particles to ultra-relativistic energies, i.e. UHE cosmic rays (CRs). The UHE CRs will interact with their host galaxies, causing heating of the interstellar medium. The UHE CRs may be advected out from the galaxies, delivering chemically enriched material and energy to the environments. In this talk the speaker will discuss the properties of multi-phase, multi-component protogalactic outflows and CR heating in the protogalactic environment in the presence of large-scale outflows. 
 
時間:2018.01.23(二) 16:30
地點:香港大學 莊月明物理樓522室
講者:胡建華 教授 Prof. Kinwah Wu(Mullard Space Science Laboratory, University College London, UK) 
語言:英語

免費講座,歡迎參加

#11

此活動由香港大學物理系主辦。

月掩天困四


2018年1月25日(星期四) 月掩鯨魚座6.0等恆星天困四,月齡初九。

18時50分掩始現象,恆星由月球暗面消失。掩始時月球仰角78度,地平方位180度
20時08分掩終現象,恆星由月球光面出現。掩終時月球仰角68度,地平方位241度

上圖是用雙筒望遠鏡肉眼所見的模擬影像

有關今次天象更詳細資料請按左下角「外部連結」

http://forum.hkas.org.hk/thread-9916-1-1.html

月掩外屏増十一


2018年1月23日(星期二) 22時52分,月掩鯨魚座6.0等恆星外屏増十一,月齡初七。掩始現象,恆星由月球暗面消失。

掩始時月球仰角7度,地平方位269度

上圖是用雙筒望遠鏡肉眼所見的模擬影像

有關今次天象更詳細資料請按左下角「外部連結」

http://forum.hkas.org.hk/thread-9914-1-1.html

天文嘉年華


觀眾可透過先進星象投影系統,欣賞各有特色的四季星空。此外亦有專業導師將遠在天邊的八大行星帶到太空館內作介紹,讓大家近距離欣賞行星表面的細節。甚至可以透過天文望遠鏡,親眼窺探月球、行星及其他天體的廬山真貌。活動包括「星空巡禮」、「魔幻行星」及「鏡中星空」三節,有興趣的人士可於活動時間內,於太空館各環節地點輪候參加。

時間:2018.01.23(二) 19:00 ~ 21:00
地點:香港太空館 何鴻燊天象廳、演講廳及天台
主持:(坐井會)

免費活動,歡迎公眾參加
如天氣欠佳,活動內容將作調整

此活動由香港太空館主辦。