【学术报告】

题目：Some updates on the star formation laws in galaxies
报告人：高煜 研究员 (报告语言：中文)
报告人单位：紫金山天文台
时间：2012 年9月5日（星期三）上午9:30
地点：主楼四楼401会议室
摘要：
We highlight some of our recent studies on the global star formation laws in galaxies.
1) We show that the surface density of dense molecular gas (traced by HCN) has
the tightest linear correlation with that of star formation rate (SFR). There is no
unique slope between the surface densities of SFR and total gas, using a large sample of
over 150 galaxies including (ultra)luminous IR galaxies [(U)LIRGs]. The correlation
slopes change from ~1 for normal spirals to ~1.5 when more and more (U)LIRGs are
included. 2) Our observations using other dense gas tracer like CS further reveal that the
SFR and dense gas relationship is linearly in all galaxies observed so far. 3)
The locally resolved SFR-HCN correlation in M51 or the local star formation law
in dense gas is also consistent with the globally established linear SFR-HCN correlation.
These suggest that SFR depends linearly upon the mass of dense molecular gas. This is
different from the traditional Kennicutt-Schmidt law that relates the total gas
and SFR, which appears to have no unique power-law slope.
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大样本恒星演化组
中国科学院天体结构与演化重点实验室
云南天文台学术委员会
2012-09-02