Tue 02/13/2018

Galaxies & Cosmology Seminar

Tuesday, February 13, 2018 - 12:00pm

Phillips Auditorium

The influence of streaming velocities on the formation of the first stars and black holes

Speaker:

Anna Schauer

Institution:

Uni Heidelberg

Abstract

The so-called streaming velocities are relative velocities between
baryons and dark matter, originating from a second-order perturbation
effect at recombination. In regions with high streaming velocities,
the halo mass function is shifted to lower masses in the early Universe.
I will give an overview of how streaming velocities delay the formation
of Population III stars and show that regions with high streaming velocity
might be good environments for the formation of direct collapse black holes.

Stellar Population Inference with Prospector

Speaker2:

Benjamin Johnson

Institution2:

CfA

Abstract

I will discuss methods for inferring the properties of stellar populations from observed spectra and photometry. Advances in this area have been necessitated by large, comprehensive, and detailed datasets and the desire for more accurate results. This has led to the fitting of observations with many-dimensional models that take into account the complex interplay of physical processes shaping the SEDs of galaxies, using techniques that account for the sometimes large degeneracies between model parameters. I will describe our approaches to these problems in our open source Prospector code, present recent results using Prospector, and discuss some remaining challenges related to the inference of star-formation histories and the validation of such techniques in general.

Event Status:

Active

Galaxies & Cosmology

Submitted by cfdrupaladm on July 29, 2015 - 5:00pm

Time:
Tuesday 12:00 - 1:00 PM

Location:
Phillips Auditorium (Directions)

Organizing Committee:
Ana Bonaca (ITC)
Jubee Sohn (OIR)
Garrett Keating (RG)
Gerrit Schellenberger (HEA)

Information:
For Speakers
For Hosts

Events

Submitted by cfdrupaladm on July 29, 2015 - 12:32pm