DAO Astronomy Colloquium


DAO Astronomy Colloquium Schedule

Online via Zoom, Victoria

Tuesdays at 11am unless otherwise indicated with (**)

Archive of previous seminar schedules (2010-)
Link to remote connection information

——————————————————————————————————————

Winter 2020

Tues January 19th, 11am, Zoom: Kim-Vy Tran (U. of Washington)

MOSEL & ZFIRE : Tracking Galaxy Growth at Cosmic Noon: MOSEL and ZFIRE are deep near-IR spectroscopic surveys that track how galaxies assemble at 1.5<z<3.5. With MOSEL, we confirm a population of Extreme Emission Line Galaxies at z~3 with Oxygen equivalent widths >250 Angstroms and hypothesize that most galaxies at z>3 go through a strong starburst phase. We compare galaxy kinematics to IllustrisTNG to determine how massive galaxies at z~3 build their stellar mass (mostly by accreting other galaxies) and end their star formation (puffy galaxies quench slower). I also summarize results from our ZFIRE survey where we find faint imprints of environmental effects on the Inter-Stellar Medium of cluster galaxies at z~2.

Tues January 26th, 4pm***, ZoomTakuma Izumi (NAOJ)

ALMA observations of z > 6 low-luminosity quasars: unbiased view on the early co-evolution and feedback: I will review our multi-wavelength campaign observations toward z > 6 optically “low-luminosity” quasars, which were originally discovered by our wide-field Subaru Hyper Suprime-Cam (HSC) optical imaging survey. Our HSC quasars are an order of magnitude fainter at rest-UV than previously-known luminous quasars. Subsequent NIR spectroscopic follow-up observations revealed a wide spread in their BH mass, hence Eddington ratio (~0.1 to 1). We have also been carrying out a series of ALMA observations ([CII] line and FIR continuum emission) toward a sample of ~20 HSC quasars. We found that their host galaxies are basically FIR-faint with LIRG-class luminosities (or SFR < 100 Msun/yr). Using the [CII]-based dynamical mass as a surrogate for bulge stellar mass, we found that a significant fraction of these low-luminosity quasars are located on or even below the local co-evolution relation, indicating the BH-galaxy co-evolution is indeed taking place at z > 6. I also talk about a particular case of a z = 7.1 HSC quasar, where we found a vigorous starburst and, surprisingly, fast [CII] outflows. Given also its broad absorption line = BAL feature  (indication of nuclear outflow), quasar-driven feedback that affects the host galaxy occurred already at this reionization era.

Tues February 2nd, 11am, Zoom: Ilse Cleeves (U. of Virginia)

Tues February 16th, 11am, Zoom: Genaro Suarez (Western U.)

Tues February 23rd, 3pm***, ZoomEmily Wisnioski (ANU)

Tues March 9th, 11am,  Zoom: Laura Keating (AIP)

Tues March 16th, 1pm***, Zoom: JJ Eldridge (U. Auckland)

Tues March 30th, 11am, Zoom: Hanno Rein (U. of T)

Tues April 6th, 11am, Zoom: Tuan Do (UCLA)

Tues April 20th, 11am, Zoom: Auriane Egal (Western U.)

Tues May 11th, 11am, Zoom: Carl Fields (MSU/Arizona/LANL)

Tues June 1st, 11am, Zoom: Yamila Miguel (Leiden)

Tues June 8th, 11am, Zoom: Shany Danieli (IAS)