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Seminar talk

Speaker: Dr. Lorant Sjouwerman  (NRAO)

Time: 10:30 am, July 15 (Monday)

Location: middle conference room, 3rd floor

Title: A Masing BAaDE's window

Abstract: 

We report on the Bulge Asymmetries and Dynamic Evolution (BAaDE) survey which has observed 19,000 MSX color selected red giant stars for SiO maser emission at 43 GHz with the VLA and is in the process of observing 9,000 of these stars with ALMA at 86 GHz in the southern sky. Our setup covers the main maser transitions as well as those of isotopologues and selected carbon lines. Observations of this set of lines allows a far-reaching catalog of line-of-sight velocities in the dust-obscured regions where optical surveys cannot reach. Our preliminary detection rate is close to 70%, predicting a wealth of new information on the distribution of metal rich and carbon rich stars, their kinematics as a function of location in the Galaxy, as well as the occurrence of lines and line ratios between the different transitions in combination with the spectral energy distribution from about 1 to 100 micron. Similar to the OH/IR stars, a clear kinematic signature between disk and bulge stars can be seen. Furthermore, the J=1-0 (v=3) line plays a prominent role in the derived maser properties, indicating diverse and/or variable pumping conditions. we further present a possibility to separate carbon-rich from oxygen-rich AGB stars using MSX colors.

 
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    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。
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