caswiki - User contributions [en]

CAS Wine and Cheese Seminars

2016-02-26T15:28:20Z

Duncan: /* Spring 2016 Schedule */

__NOTOC__
[[Image:Winecheese.jpeg|right|400px]]
The JHU/STScI [[CAS Wine and Cheese Seminars]] take place in Bloomberg 462 every Monday at 4:00 pm Eastern. Each week, there will be either one speaker, giving an hour-long presentation (50+10), or two speakers, each giving a half hour (25+5) presentation. Hour-long speakers will be invited by the committee, and the half-hour speakers will comprise both local researchers and visitors with a wide range of scientific interests. There will be excellent wine, cheese, and other refreshments to go along with the talks and discussions. Should you have any questions, comments, or speaker suggestions, please contact us: [[CAS Wine and Cheese Committee]].

 

'''Where''': Bloomberg 462 (Directions can be found here: [[Visitor Parking | How to get here]])

'''When''': Every Monday at 4:00 pm

'''Who''': Everyone is welcome

'''Format''': Keynote/PPT, PDF, or blackboard format. (Speakers may use their own laptops, and we will check that the display works ahead of time. Please have slides available online or on a portable drive in case we need to use a different computer.)

 

== [[Wine and Cheese Spring 2016|Spring 2016 Schedule]] ==

{| border="1" style="text-align:left;"
! align="left" |Date
! Speaker
! Title
|-

|-
|Feb 1 || Ilias Cholis (JHU) || [[Wine and Cheese Spring 2016#Ilias Cholis|Towards a predictive analytic model for the solar modulation of cosmic rays]]
|-
|-
| || William Blair (JHU) || [[Wine and Cheese Spring 2016#William Blair|
Understanding the Curious Young Supernova Remnant Population in M83]]
|-
|-

|-
|Feb 8 || David Hogg (NYU) || ''To Be Rescheduled''
|-

|-
|Feb 15 || Saleem Zaroubi (KAI) || [[Wine and Cheese Spring 2016#Saleem Zaroubi|Probing the Epoch of Reionization from LOFAR]]
|-

|-
|Feb 22 || Mubdi Rahman (JHU) || [[Wine and Cheese Spring 2016#Mubdi Rahman|Early-time Feedback in the Milky Way]]
|-
|-
| || K.D. Kuntz (JHU) || [[Wine and Cheese Spring 2016#K.D. Kuntz|Solar Wind Charge Exchange, from Annoying Background to Interesting Physics]]
|-

|-
|Feb 29 || Ethan Vishniac (JHU) || [[Wine and Cheese Spring 2016#Ethan Vishniac|The Role of Helicity Conservation in Turbulent Dynamos]]
|-

|-
|Mar 7 || Nathan Miller (JHU/Goddard) || [[Wine and Cheese Spring 2016#Nathan Miller|Recovery of Large Angular Scale CMB Polarization for Instruments Employing Variable-delay Polarization Modulators
]]
|-
|-
| || Duncan Watts (JHU) || [[Wine and Cheese Spring 2016#Duncan Watts|Measuring the Largest Angular Scale CMB B-mode Polarization with Galactic Foregrounds on a Cut Sky
]]
|-

|-
|Mar 14 || Spring break || ''No seminar''
|-

|-
|Mar 21 || Tony Sohn (JHU) || [[Wine and Cheese Spring 2016#Tony Sohn|HST Proper Motions along Stellar Streams: Constraining Dark Halo Properties of the Milky Way]]
|-

|-
|Mar 28 || Ravi Sankrit (SOFIA)|| [[Wine and Cheese Spring 2016#Ravi Sankrit|TBD]]
|-
|-
| || Zhilei Xu (JHU) || [[Wine and Cheese Spring 2016#Zhilei Xu|TBD]]
|-

|-
|April 4 || Michael Fall || [[Wine and Cheese Spring 2016#Name|TBD]]
|-

|-
|April 18 || Joel Green (STScI)|| [[Wine and Cheese Spring 2016#Joel Green|TBD]]
|-
|-
| || Chi Ho Chan (JHU) || [[Wine and Cheese Spring 2016#Chi Ho Chan|Self-consistent radiative hydrodynamics simulations of dusty AGN Tori]]
|-

|-
|April 25 || TBD|| [[Wine and Cheese Spring 2016#Name|TBD]]
|-

|-
|May 2 || TBD|| [[Wine and Cheese Spring 2016#Name|TBD]]
|-
|}

----

== Past Seminars ==
* [[Wine and Cheese Fall 2015|Fall 2015 Schedule]]
* [[Wine and Cheese Spring 2015|Spring 2015 Schedule]]
* [[Wine and Cheese Fall 2014|Fall 2014 Schedule]]
* [https://sites.google.com/site/jhustsciastrowinecheese/ JHU/STScI Wine & Cheese Seminar Series (before Fall 2014)]
* [http://www.pha.jhu.edu/~stephan/CAS_seminar/ JHU CAS Seminars (before Fall 2014)]

== See also ==
* [[Astro-ph Coffee]]
* [[People]]
* [[STScI Colloquium]]

Wine and Cheese Spring 2016

2016-02-26T15:27:18Z

Duncan: /* March 7th */

{| align="right"
| __TOC__
|}

This page records the schedule, titles and abstracts of the [[CAS_Wine_and_Cheese_Seminars|JHU/STScI CAS Astrophysics Wine & Cheese Series]] in Spring 2016.

If not specified otherwise, the talks are a 25-min presentation plus a 5-min Q/A session.

<h2>[[CAS_Wine_and_Cheese_Seminars|Back to W&C Schedule]] </h2>

=February 1st=
== Ilias Cholis ==
'''Towards a predictive analytic model for the solar modulation of cosmic rays''' 
An important factor limiting our ability to understand the production and propagation of cosmic rays pertains to the effects of heliospheric forces, commonly known as solar modulation. The solar wind is capable of generating time and charge-dependent effects on the spectrum and intensity of low energy (~10 GeV) cosmic rays reaching Earth. Previous analytic treatments of solar modulation have utilized the force-field approximation, in which a simple potential is adopted whose amplitude is selected to best fit the cosmic-ray data taken over a given period of time. Making use of recently available cosmic-ray data from the Voyager 1 spacecraft, along with measurements of the heliospheric magnetic field and solar wind, I will show a time, charge and rigidity-dependent model of solar modulation that can be directly compared to data from a variety of cosmic-ray experiments. This is a simple analytic formula that can be easily utilized in a variety of applications, allowing us to better predict the effects of solar modulation and reduce the number of free parameters involved in cosmic ray propagation models.

== William Blair ==
'''Understanding the Curious Young Supernova Remnant Population in M83''' 
The nearby starburst galaxy M83 has been host to at least six (and likely seven!) supernovae in the last century, many of the core-collapse type. Hence, one might expect dozens of young SN remnants similar to, say, Cas A in our Galaxy or E0102-7219 in the SMC. We have used deep Chandra observations in conjunction with HST WFC3 imaging to find and diagnose the young SN remnants in M83 and, by in large, they do not look like Cas A (that is to say, dominated by emission from SN ejecta). Rather, they appear to be bright radiative remnants like the Cygnus Loop even though they are much smaller and younger. This rapid evolution into the radiative phase may be unique to the M83 population, due to high metal abundances and a high pressure ISM. Our investigation is ongoing, with Gemini GMOS spectroscopy of many of these young SN remnants providing additional clues.

=February 8th=
==David Hogg==
'''Postponed''' 
Abstract

=February 15th=
== Saleem Zaroubi ==
'''Probing the Epoch of Reionization from LOFAR''' 
The Epoch of Reionization is one of the least explored epochs in the history of the
Universe. The redshifted 21 cm line from neutral hydrogen emitted during this epoch is the most
promising probe for exploring it. To date there are a number of low frequency radio telescope that
are aiming at detecting this radiation. The LOw Frequency ARray, LOFAR, which a European telescope
centred in the Netherlands, has started collecting data on December 2012. I will discuss the current
status of the experiment and the main results coming out of it.

=February 22nd=
==Mubdi Rahman==
'''Early-time Feedback in the Milky Way''' 
Understanding the process of energetic feedback from star formation requires comprehensive exploration of both the stellar and gaseous components of star forming complexes. The diversity of scales probed make conducting such studies difficult in extragalactic systems. The Milky Way provides an excellent opportunity to explore feedback processes in detail, albeit with a unique set of challenges. In this talk, I will be discussing our current strides in measuring and analyzing feedback from massive star formation in the Milky Way.

==K.D. Kuntz==
'''Solar Wind Charge Exchange, from Annoying Background to Interesting Physics''' 
Solar Wind Charge Exchange (SWCX) in the Earth's magnetosheath produces a very poorly characterized, directionally dependent, highly time variable foreground component to all X-ray observations. However, the X-ray emission from the magnetosheath will also allow one to make global images of the magnetosheath. Tradition methods of studying the magnetosheath have relied on very local measurements of the magnetic field and the particle distribution. As a result, some of the physical processes shaping the magnetosheath are poorly understood. It would appear that different mechanisms dominate under different solar wind conditions. Global imaging of the magnetosheath in the X-ray will allow measurement of key physical properties of the magnetosheath, and will severely test existing MHD models.

=February 29th=
==Ethan Vishniac==
'''The Role of Helicity Conservation in Turbulent Dynamos''' 
The analytic theory of large scale magnetic field generation is usually conceived as a process driven by the fluid kinetic helicity and poisoned by the accumulation of eddy scale magnetic helicity. I will discuss a better approach, in which turbulence in a a rotating and/or shearing flow leads to a spontaneous flux of magnetic helicity. Its accumulation in separate domains drives the magnetic dynamo. The kinetic helicity is typically subdominant at all times. Balancing this process against turbulent mixing and buoyant loss leads to a prediction for the saturated large scale magnetic field strength in rotating stars and disks. This prediction is consistent with observations of stars. I will briefly discuss the application of this model to field growth in young galaxies and typical field strengths in accretion disks. If time allows I will comment on the implications of this work for numerical modeling of dynamo processes.

=March 7th=
==Nathan Miller==
'''Recovery of Large Angular Scale CMB Polarization for Instruments Employing Variable-delay Polarization Modulators
''' 
Abstract

==Duncan Watts==
'''Measuring the Largest Angular Scale CMB B-mode Polarization with Galactic Foregrounds on a Cut Sky
''' 
Abstract

=March 15th Spring break=

=March 21st=
== Tony Sohn ==
'''HST Proper Motions along Stellar Streams: Constraining Dark Halo Properties of the Milky Way''' 
Stellar streams in the Milky Way are unique dynamical tracers of the dark matter halo, and provide strong tests of galaxy formation models. However, lack of proper motion data limits our understanding of stream orbits and dark halo properties. Thanks to the HST's excellent astrometric accuracy, we are now able to obtain high quality proper motions along stellar streams in the Milky Way. In this talk, I will present our results on HST projects for measuring proper motions along two stellar streams in the halo: the Sagittarius Stream and the Orphan Stream.
==Name==
'''Title''' 
Abstract

=March 28th=
==Ravi Sankrit==
'''Title''' 
Abstract

==Zhilei Xu==
'''Title''' 
Abstract

=April 4th=
==Michael Fall==
'''TBD''' 
Abstract

=April 11th=
==Name==
'''Title''' 
Abstract

=April 18th=
==Joel Green==
'''Title''' 
Abstract
==Chi Ho Chan==
'''Self-consistent radiative hydrodynamics simulations of dusty AGN Tori''' 
TBD

=April 25th=
==Name==
'''Title''' 
Abstract

=May 2nd=
==Name==
'''Title''' 
Abstract

Projects

2014-09-29T14:39:21Z

Duncan:

There are a LARGE number of big projects (co-)led by CAS scientists. This is a far-from-complete list. Check the School webpage for more information: http://sites.krieger.jhu.edu/astronomy

* [http://www.sdss.org/ SDSS]: The Sloan Digital Sky Survey
* [http://pan-starrs.ifa.hawaii.edu/public/ PanStarrs]: The Panoramic Survey Telescope & Rapid Response System
* [http://www.stsci.edu/~postman/CLASH/Home.html CLASH]: Cluster Lensing And Supernova survey with Hubble
* [http://en.wikipedia.org/wiki/Cosmology_Large_Angular_Scale_Surveyor CLASS]: The Cosmology Large Angular Scale Surveyor
* [http://sumire.ipmu.jp/pfs/intro.html PFS]: Prime Focus Spectrograph on the Subaru Telescope
* ...

== See Also ==

* [[People]]
* back to [[JHU CAS Wiki]]