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Home > Recent Colloquia
Title: Unanswered mysteries in observational cosmology
Prof. Tomotsugu GOTO 後藤友嗣 (NTHU)
Dr. Tetsuya Hashimoto
Dr. Seong-Jin Kim
Mr. Yi-Han Wu
Time: 15:30pm 5th Dec. 2018 (Friday)
Venue: R521, IoA, 2nd General Building 綜二館R521
Tomo's group members will introduce NTHU cosmology groups' attempts to solve mysteries in the extragalactic Universe.
Time: 15:30pm 29th Dec. 2017 (Friday)
Venue: R521, IoA, 2nd General Building 綜二館R521
Speaker: En-Tzu Lin 林恩慈
Title: The X-ray counterpart to the gravitational-wave event GW170817
       (Troja, E., Piro, L., van Eerten, H., et al. 2017, Nature, 551, 71)
Speaker: You-Ting Yeh 葉祐廷
Title: VVV Survey Microlensing Events in the Galactic Center Region
       (Navarro, M. G., Minniti, D., & Contreras Ramos, R. 2017, ApJL, 851, L13)
Speaker: Shiang-Chih Wang 王祥至
Title: The Stellar Obliquity, Planet Mass, and Very Low Albedo of Qatar-2 from K2 Photometry
       (Dai, F., Winn, J. N., Yu, L., & Albrecht, S. 2017, AJ, 153, 40)

Time: 12/13, Wed, 15:30

Location: Rm507, meeting room in the IoA lounge

Speaker: Mr. Christian M. Fuchs (Leiden Institute of Advanced Computer Science (LIACS), Universiteit Leiden)

Title: On the Feeding and Care of CubeSats: Lessons Learned from Two University CubeSat Projects

Faculty-Position Interview Talks
Institute of Astronomy
Title: Forming stellar siblings: a look at the chemistry and physics of multiple stars
Speaker: Dr. Nadia Murillo (University of Leiden)
Time: 15:30pm 8th Dec. 2017 (Friday)
Venue: R521, IoA, 2nd General Building 綜二館R521
Time: 15:30pm 1st Dec. 2017 (Friday)
Venue: R521, IoA, 2nd General Building 綜二館R521
Speaker: Travis Thieme 陸哲軒
Title: Signs of Early-stage Disk Growth Revealed with ALMA
(Yen, H.-W., Koch, P. M., Takakuwa, S., et al. 2017, ApJ, 834, 178)
Speaker: Jane Yap 葉於瑄
Title: Origin of the heavy elements in binary neutron-star mergers from a gravitational-wave event
(Kasen, D., Metzger, B., Barnes, J., Quataert, E., & Ramirez-Ruiz, E. 2017, Nature, 551, 80)
Speaker: Pattana Chintarungruangchai 周厚發
Title: Searching for Exoplanets Using Artificial Intelligence
(Pearson, K. A., Palafox, L., & Griffith, C. A. 2017, arXiv:1706.04319)
Title: ALMA Observations of Protostellar Disks and Jets in the Early Stages of Star Formation
Speaker: Chin-Fei Lee 李景輝 (Institute of Astronomy and Astrophysics, Academia Sinica)
Time: 15:30pm 24th Nov. 2017 (Friday)
Venue: R521, IoA, 2nd General Building 綜二館R521

Title: Measuring the magnetic fields in IC5146 cloud

Speaker: Jia-Wei Wang 王嘉瑋 (NTHU)
Time: 15:30pm 10th Nov. 2017 (Friday)
Venue: R521, IoA, 2nd General Building 綜二館R521
Title: The Spiral Structure of the Milky Way Galaxy: A New Picture
Speaker: Prof. Uri (Evgeny) Griv (Ben-Gurion University, Israel)
Time: 15:30pm 3rd Nov. 2017 (Friday)
Venue: R521, IoA, 2nd General Building 綜二館R521
Time: 2PM, October 31, 2017
Venue: R521, IoA, 2nd General Building 綜二館R521
Speaker: Prof. Toshifumi Futamase (Kyoto Sangyo University)
Title: Constraints on neutrino masses from the lensing dispersion of Type Ia supernovae
Title: The circumstellar matter ditribution of MYSOs
Speaker: Dr. Olguin Choupay, Fernando Andres (NTHU)
Time: 15:30pm 27th Oct. 2017 (Friday)
Vanue: R521, IoA, 2nd General Building 綜二館R521
Title: Observing the Orion-KL region with ALMA
Speaker: Dr. Laurent Pagani (The National Center for Scientific Research & Observatoire de Paris, France)
Time: 15:30pm 20th Oct. 2017 (Friday)
Vanue: R521, IoA, 2nd General Building 綜二館R521
Title: Physics of the first Stars, Supernovae, and Galaxies
Speaker: Dr. Chen, Ken 陳科榮 (Institute of Astronomy and Astrophysics, Academia Sinica)
Time: 15:30pm 13th Oct. 2017 (Friday)
Vanue: R521, IoA, 2nd General Building 綜二館R521
Title: Our Place in the Universe
Speaker: Prof. Sun Kwok 郭新 (The University of Hong Kong)
Time: 15:30pm 6th Oct. 2017 (Friday)
Vanue: R521, IoA, 2nd General Building 綜二館R521


Title: The Challenges and Joy of Doing Astronomy
Speaker: Professor Kong, Albert 江國興 (NTHU)
Time: 15:30pm 29nd Sep. 2017 (Friday)
Vanue: R521, IoA, 2nd General Building 綜二館R521

Title: Cosmological simulation with Dust Formation and Destruction with ISM physics

Speaker: Dr. Aoyama, Shohei 青山尚平 (Academia Sinica Institute of Astronomy and Astrophysics)

Time: 3:30pm 22nd Sep. 2017 (Friday)

Vanue: R521, IoA, 2nd General Building 綜二館R521


Time: 2pm, Monday, August 14
Venue: R521, IoA, 2nd General Building
Speaker: Prof. Alex Lazarian (University of Wisconsin-Madison) 
Title: New way to study interstellar magnetic fields: velocity gradients



Special Seminar

Title:  Large Millimeter Bolometric Arrays for Cosmic Microwave Background Observations


Shuay-Pwu Patty Ho (Princeton University)


2pm-3pm, Thursday, August 3 at General Building II R521, IoA


The cosmic microwave background (CMB) continues to reveal new aspects of the large scale universe. For example, current projects are searching for evidence of primordial gravitational waves, for signatures sensitive to the sum of the neutrino masses, and for further understanding of the formation and growth of large structures under the influence of gravity in the accelerating universe. Technologies for ground-based and balloon-borne instruments measuring the polarization of the CMB have been well established and advanced in the last decade.

Two upgraded bolometric polarimeters on the Atacama Cosmology Telescope (ACT), the ACT Polarimeter (ACTPol) and the Advanced ACTPol, have made and will make sensitive measurements of the temperature and polarization in the Cosmic Microwave Background (CMB) with arcminute resolution.  In this talk, I will focus on the instrumentation of these state-of-the-art arrays, especially the Advanced ACTPol ones. I will conclude with the results coming from the two-season cosmological results presented in Louis et al. (2016) and describe the current progress on the all three ACTPol seasons.


Special Seminar

Title:  Evolutionary Description of Giant Molecular Cloud Mass Functions on Galactic Disks

Masato Kobayashi (Nagoya University, Japan)

2pm-3pm, Monday, July 10 at GEN II R521


Recent radio observations show that giant molecular cloud (GMC) mass functions noticeably vary across galactic disks (e.g., Colombo et al. 2014). High-resolution magnetohydrodynamics simulations show that multiple episodes of compression are required for creating a molecular cloud in the magnetized interstellar medium (e.g., Inoue et al. 2012). To understand time evolution of GMC mass functions, we formulate the evolution equation for the GMC mass function to reproduce the observed profiles, for which multiple compressions are driven by a network of expanding shells due to H II regions and supernova remnants. We also introduce the cloud-cloud collision (CCC) terms in the evolution equation in contrast to previous work. In this seminar, I would like to present computed time evolutions and the following two suggestions:

(1) the GMC mass function slope is governed by the ratio of GMC formation timescale to its dispersal timescale whereas the CCC effect is limited only in the massive end of the profile,

(2) almost all of the dispersed gas contributes to the mass growth of pre-existing GMCs in arm regions whereas less than 60 percent contributes in inter-arm regions. Our results suggest that measurement of the GMC mass function slope provides a powerful method to constrain those GMC timescales and the gas resurrecting factor in various environments across galactic disks.

Time Coordinate: 3:30 pm 9th June 2017 (Friday)

Space Coordinate: NTHU General Building II, R521

Speaker: He-Feng Hsieh and Ing-Guey Jiang (NTHU)

Title: Imaging the Exoplanets


Imaging method is a viable pathway to detect exoplanet and characterize the planetary atmosphere. However, imaging exoplanets is challenging due to the small angular separation and extreme intensity contrast between the exoplanet and its host star (~1e-4 for self-luminous giant planets and ~1e-10 for rocky planets). Collaborating with Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, we are developing next generation Adaptive Optic (AO) systems aiming to detect and characterize rocky exoplanets. The design of AO systems, the observation strategy, data reduction techniques, and the method for retrieving physical properties of imaged objects will be introduced in this talk.