Astronomy Colloquium for 2017-02-15

Series: Astronomy Colloquium
Date: Wednesday 15-Feb-2017
Time: 16:05-17:00 (4:05-5:00 pm)
Location: CSS 2400
Speaker: Dr. Hidenobu Yajima (Tohoku University)
Title: High-redshift Lyman-alpha emitting galaxies and submillimeter sources in cosmological simulations

Lyman-alpha emitting galaxies (LAEs) are key objects to understand cosmic reionization and galaxy formation in the early Universe. Combining cosmological hydrodynamics simulations and multi-wavelength radiation transfer calculations, we investigate the formation mechanism of LAEs and their contribution to cosmic reionization. Our findings are as follows : (1) cold gas accretion produces bright LAEs via the excitation cooling process; (2) observed LAEs can keep the ionization of IGM at z < 7; (3) some of high-z LAEs evolve to local L* galaxies (Yajima et al. 2015, ApJ, 801, 52; Yajima et al. 2017 arXiv:1701.05571). In addition, interstellar dust absorbs UV continuum and Lyman-alpha photons, and releases the absorbed energy by their thermal emission.

In this talk, I will discuss high-z submillimeter sources by calculating the thermal emission from dust.

Colloquia are usually preceded by espresso and ice cream at 1:45 pm outside room PSC 1150 and are followed by an informal reception at 5:15 pm in that room. Anyone interested in talking with the speaker, or being added to the colloquium announcement email list, should contact the colloquium organizer. Lunch will normally be reserved for the speaker to talk to graduate students.

Colloquium Organizer: Prof. Stuart Vogel


Special accommodations for individuals with disabilities can be made by calling (301) 405-3001. It would be appreciated if we are notified at least one week in advance.


Directions and information about parking can be found here.

This page was automatically generated on: 24-Feb-2017.