SHAO Astrophysics Colloquium

Title: The LAMOST Spectroscopic Survey of the Galactic Anti-center

Speaker: Xiaowei Liu (Yunnan University/PKU)

Time： 3pm, October 12 (Thursday)

Location: Lecture Hall, 3rd floor

Group meetings

Black hole Accretion and High-energy Astroaphysics /Black Hole Feedback and Cosmic Ray Astrophysics Seminar

Location: 1608

Time: 14:00-16:00, Wednesday(Oct. 11th)

Speaker: Doosoo Yoon

Title: The link between galaxy and black hole growth in the eagle simulation

http://adsabs.harvard.edu/abs/2017MNRAS.468.3395M

Speaker: Can Cui
Title: AGN feedback in galaxy groups: the delicate touch of self-regulated outflows

http://adsabs.harvard.edu/abs/2011MNRAS.415.1549G

http://adsabs.harvard.edu/abs/2011MNRAS.411..349G

Galaxies Group Journal Club

Location:  in 16th floor seminar room

Time: Oct. 12th (Thursday) at 12:00 PM

Title: Progress in the mid-infrared study of molecular hydrogen
Abstract: Stars form in the contraction of cold gas cloud, so H2  can be regarded as the main initial fuel reserves of star formation. Access to the knowledge of the molecular gas can help us understand the star-forming in galaxies better. In a long time, the idea that molecular hydrogen is directly related to star formation has also been widely accepted. However, in fact, it's hard to detect H2 for a long time. Although H2 is very rich in starburst and even dominant in the baryon quality, but in the cold interstellar medium, H2 can't be observed directly because it can not effectively radiate, (as there is no permanent dipole in H2 , rotation millimeter line cannot be observed directly). Until recently, the development of infrared telescopes allows researchers to detect molecular hydrogen rotational lines through infrared spectroscopy.The researchers found that the rotational spectral lines of molecular hydrogen observed at mid-infrared wavelengths are not affected by dust obscuration, even someone found a strong correlation between H2 and [Fe II] line luminosities, suggesting that excess H2 is produced in shocks propagating within neutral or partially ionized medium. In addiction, the newest result presented a new method of estimating total molecular gas mass in galaxies directly from pure mid-infrared rotational H2 emission. In this review, I will firstly introduct  some controversy and key problems in the present mid-infrared study of molecular hydrogen, then I will emphasize the molecular hydrogen study in the  normal galaxies, ULIRGs and the method to calculate the total mass of molecular hydrogen through rotational H2 emission. Finally, I will give a summarize and make a prospect for the future.
Reference:

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Roussel H. et al., 2007, ApJ, 669, 959
Zakamska N. L., 2010, Nature, 465, 60
Zakamska N. L., 2014,MNRAS.439.2701H
J. D. T. Smith.et al ,2016,ApJ，830，1