Astro Tuesday Series: 2015
DateEventTalk
September 29, 2015ChalkTalkLaura Kreidberg, Adventures in Atmospheric Chemistry from 100 Parsecs
Joshua A. Frieman, Strongly Lensed QSOs in DES: a New-Old Probe of Cosmology
October 6, 2015ChalkTalkNickolay Y. Gnedin, Why We Should Not Study Lyman-alpha Emitters
Michael Florian, Morphologies of Lensed Galaxies
October 13, 2015Tuesday SeminarAleks Diamond-Stanic, Extreme Outflows and the FGas Around Galaxies
October 20, 2015ChalkTalkSean Johnson, Observations of circumgalactic gas -- feeding vs. feedback
Titos Matsakos, Planets on the menu of stars
October 27, 2015ChalkTalkFausto Cattaneo, MHD turbulence: from gnocchi, to spaghetti, to linguine
Julia Borst Brazas, Tradition and Innovation in Science Pedagogy: What Research Says About Effective Teaching
November 3, 2015ChalkTalkScott Dodelson, Getting more physics from Photometric Surveys
Alexander A. Kaurov, Reionization: if not Lyman-alpha emitters, then what?
November 10, 2015Tuesday SeminarKatherine Alatalo, Catching Quenching Galaxies: Following the Road Less Traveled to Galaxy Transformation
November 17, 2015ChalkTalkAngela V. Olinto, The Astro (Mid-)Decadal Process
Leslie Rogers, Exo-Mercury Analogues and the Roche Limit for Close-Orbiting Rocky Planets
November 24, 2015ChalkTalkVikram Dwarkadas, A few gamma rays and a neutrino - Probing Particle Acceleration in a Young SN
Ian Remming, Recent advances in our understanding of Type Ia supernovae with more to come
December 1, 2015ChalkTalkErik Shirokoff, Novel superconducting devices for multi-wavelength astronomy
Carlo Graziani, The Biermann Catastrophe of Numerical MHD
December 8, 2015ChalkTalkBradford A. Benson, Designing CMB-S4
Hsin-Yu Chen, Facilitating Follow-up of Electromagnetic counterparts to Gravitational Wave Events
December 15, 2015Tuesday SeminarAaron Parsons, 21cm Cosmology: The End of the Beginning

ChalkTalk
September 29, 2015 | ERC 501 | 12:00 PM

  • Adventures in Atmospheric Chemistry from 100 Parsecs
  • Joshua A. Frieman
    Strongly Lensed QSOs in DES: a New-Old Probe of Cosmology

ChalkTalk
October 6, 2015 | ERC 501 | 12:00 PM
  • Nickolay Y. Gnedin
    Why We Should Not Study Lyman-alpha Emitters
  • Michael Florian
    Morphologies of Lensed Galaxies

Extreme Outflows and the FGas Around Galaxies
October 13, 2015 | ERC 576 | 12:00 PM | Host: Hsiao-Wen Chen
Aleks Diamond-Stanic, University of Wisconsin-Madison

Our understanding of galaxy evolution centers around questions of how gas gets into galaxies, how it participates in star formation and black hole growth, and how it is returned to its galactic surroundings via feedback. On a global scale, measurements of the baryon density and the stellar mass function indicate that only 5% of baryons have formed stars by the present day, and this suggests that feedback from massive stars and supermassive black holes must prevent gas from forming stars in both low-mass and high-mass dark matter halos. I will present observational results on the geometry and kinematics of outflowing and inflowing gas around galaxies, including measurements of ejective feedback that is capable of quenching star formation by removing the cold gas supply. These results have broader implications for how gas is consumed and expelled at the centers of massive galaxies and for the limits of feedback from stellar radiation and supernovae. I will also discuss prospects for characterizing the physical properties of gas in and around galaxies using multi-wavelength spectroscopy with existing and future facilities.

ChalkTalk
October 20, 2015 | ERC 501 | 12:00 PM

  • Observations of circumgalactic gas -- feeding vs. feedback

  • Planets on the menu of stars

ChalkTalk
October 27, 2015 | ERC 501 | 12:00 PM
  • Fausto Cattaneo
    MHD turbulence: from gnocchi, to spaghetti, to linguine
  • Julia Borst Brazas
    Tradition and Innovation in Science Pedagogy: What Research Says About Effective Teaching

ChalkTalk
November 3, 2015 | ERC 501 | 12:00 PM

  • Getting more physics from Photometric Surveys

  • Reionization: if not Lyman-alpha emitters, then what?

Catching Quenching Galaxies: Following the Road Less Traveled to Galaxy Transformation
November 10, 2015 | ERC 576 | 12:00 PM | Host: Hsiao-Wen Chen
Katherine Alatalo, Carnegie Observatories

Modern day galaxies are found to be in a bimodal distribution, both in terms of their morphologies, and in terms of their colors, and these properties are inter-related. In color space, there is a genuine dearth of intermediate colored galaxies, which has been taken to mean that the transition a galaxy undergoes to transform must be rapid. I will discuss two such pathways galaxies take to rapidly transform from vibrant, blue spirals into quiescent, red elliptical and lenticulars, in particular, through the lens of the molecular gas. This includes the ways in which (1) AGN feedback (one of the proposed transformation mechanisms) and (2) constant harassment within compact groups can impact an environment that is rich in molecular gas, rendering it unable to form stars. I discuss new observations that have shown this phenomenon (as well as potential recipes to identify more of these objects), as well as the implications that these mechanisms have for galaxy evolution.

ChalkTalk
November 17, 2015 | ERC 501 | 12:00 PM
  • Angela V. Olinto
    The Astro (Mid-)Decadal Process
  • Leslie Rogers
    Exo-Mercury Analogues and the Roche Limit for Close-Orbiting Rocky Planets

ChalkTalk
November 24, 2015 | ERC 501 | 12:00 PM
  • Vikram Dwarkadas
    A few gamma rays and a neutrino - Probing Particle Acceleration in a Young SN
  • Ian Remming
    Recent advances in our understanding of Type Ia supernovae with more to come

ChalkTalk
December 1, 2015 | ERC 501 | 12:00 PM
  • Erik Shirokoff
    Novel superconducting devices for multi-wavelength astronomy
  • Carlo Graziani
    The Biermann Catastrophe of Numerical MHD

ChalkTalk
December 8, 2015 | ERC 501 | 12:00 PM
  • Bradford A. Benson
    Designing CMB-S4
  • Hsin-Yu Chen
    Facilitating Follow-up of Electromagnetic counterparts to Gravitational Wave Events

21cm Cosmology: The End of the Beginning
December 15, 2015 | ERC 161 | 12:00 PM | Host: John E. Carlstrom
Aaron Parsons, University of California, Berkeley

Since it was first proposed nearly two decades ago, measuring 21cm emission from neutral hydrogen in our early universe has tantalized us as a powerful probe of both cosmology and astrophysics. While the science case for 21cm cosmology, particularly during the Epoch of Reionization, is well established, the technical path toward measuring this signal has been more problematic. PAPER has recently distanced itself from its competitors, applying major technical breakthroughs to set the first physically meaningful upper limits on 21cm emission during reionization, and improving those limits a year later to show the presence of significant early heating. Even as PAPER's final season is under analysis, we are re-tooling our array to become HERA. New 14-m dishes are replacing PAPER's smaller elements, giving HERA the sensitivity to drive beyond the detection phase of 21cm cosmology, into the exciting era of data-driven modeling. The results will revolutionize our understanding of galaxy and star formation and even improve upon CMB cosmology.