Astrophysics Seminars

Oct
10
2013

Institute for Advanced Study Informal Astrophysics Seminar

The Sad Story of the Cosmic EUV Background
Matt McQuinn
11:00am|Bloomberg Hall, Astrophysics Library

After reionization, a largely uniform ~1 Rydberg background pervaded the Universe, keeping the intergalactic hydrogen extremely ionized. The characteristics of this background depend on the properties of the sources (quasars and galaxies) and the...

Oct
08
2013

Institute for Advanced Study Astrophysics Seminar

Aberrations Produced by Telescopes and by Galaxies
Paul Schechter
11:00am|Bloomberg Hall Astrophysics Library

ABSTRACT: Astronomers have given two independent sets of names to a single set of phenomena -- the aberrations of images by telescopes and by non-uniform mass distributions. One such phenomenon is called astigmatism when it arises in telescopes and...

Sep
26
2013

Institute for Advanced Study Informal Astrophysics Seminar - NOTE LOCATION!

21cm Fluctuations During the Dark Ages Accounting for the Relative Velocity of Baryons and CDM
Yacine Ali-Haïmoud
11:00am|Bloomberg Hall, Physics Library
Observations of high-redshift 21cm brightness temperature fluctuations are challenging but can potentially provide unprecedented information about the early universe. In particular, they are the only direct probe of large-scale structure during the...
Sep
19
2013

Institute for Advanced Study Informal Astrophysics Seminar

The Galaxy-Halo Connection and the Evolution of the Red Sequence
Jeremy Tinker
11:00am|Bloomberg Hall, Astrophysics Library
I will review recent advances in the modeling of galaxy bias in the context of galaxy evolution. The connection between galaxies and dark matter halos contains significant information for understanding how galaxies form and evolve. I will focus on...
Sep
17
2013

Institute for Advanced Study Astrophysics Seminar

Mega-maser Cosmology Project
Fred K.Y. Lo
11:00am|Bloomberg Hall Astrophysics Library
Accurate measurements of H0 - the current expansion rate of the Universe, provide critical independent constraints on dark energy, spatial curvature of the Universe, neutrino physics, and validity of general relativity. The recent Planck results...
May
30
2013

Institute for Advanced Study Informal Astrophysics Seminar

Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector
Francis Halzen
11:00am|Bloomberg Hall, Astrophysics Library
Construction and commissioning of the cubic-kilometer IceCube neutrino detector and its low energy extension DeepCore have been completed. The instrument detects neutrinos over a wide energy range: from 10 GeV atmospheric neutrinos to 1010 GeV...
May
21
2013

Institute for Advanced Study Astrophysics Seminar

A Hierarchy of Models for Studying Atmospheric Dynamics and Climate Change
Issac Held
11:00am|Bloomberg Hall Astrophysics Library
ABSTRACT: A hierarchy of atmospheric models of increasing complexity is essential to attempts at understanding the Earth's climate and future climate change. Some examples of elements of this hierarchy and examples of their use will be provided...