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Events During the Week of January 24th through January 31st, 2021

Monday, January 25th, 2021

Academic Calendar
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Plasma Physics (Physics/ECE/NE 922) Seminar
Status and progress in the domestic liquid metal plasma-facing component design program
Time: 12:00 pm
Place: Zoom Meeting
Speaker: Rajesh Maingi and Andrei Khodak, PPPL
Abstract: Chris Hegna is inviting you to a scheduled Zoom meeting.

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https://uwmadison.zoom.us/j/91835419103?pwd=YXhDdGlFeEZtc0c0MlZySUp0Q1FrUT09

Meeting ID: 918 3541 9103
Passcode: 578475
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Meeting ID: 918 3541 9103
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Meeting ID: 918 3541 9103
Passcode: 578475
Host: Chris Hegna
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Monday Science Seminar
Monday Science Seminar w/ Dr. Robert Benjamin (University of Wisconsin - Whitewater)
Time: 12:00 pm
Place: https://uwmadison.zoom.us/j/96822123897?pwd=Z0ZESm1CNFRkUTVEMEIxM2RuN3h0UT09
Speaker: Dr. Robert Benjamin, University of Wisconsin - Whitewater
Abstract: “A Thirty Degree Ionized Circular Arc Around the Big Dipper…and Other Surprises”

Abstract: I describe the discovery of a faint (1 Rayleigh) thirty-degree circular arc of ionized gas centered on the handle of the Big Dipper: the Ursa Major Arc. The arc subtends one radian of a circle of angular diameter 60 degrees, is detected in both H-alpha and diffuse ultraviolet emission and is one of the most unusual objects in the sky. I compare this object to other recently discovered large angular size supernova remnants and describe the significance of these objects. If time allows, I will share some other recent discoveries of ionized gas structures in the Milky Way.
Host: Snezana Stanimirovic & Melinda Soares-Furtado
Presentation: Monday_Science_Seminar.pdf
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Tuesday, January 26th, 2021

No events scheduled

Wednesday, January 27th, 2021

Physics ∩ ML Seminar
The Importance of Being Interpretable
Time: 11:00 am
Place: Online Seminar: Please sign up for our mailing list at www.physicsmeetsml.org for zoom link
Speaker: Michelle Ntampaka, Space Telescope Science Institute
Abstract: Cosmology is entering an era of data-driven science. Modern machine learning techniques are being combined with large astronomical surveys to enable powerful new research methods. This shift in our scientific approach requires us to ask an important question: Can we trust the black box? I will present a deep machine learning approach to constraining cosmological parameters with multi-wavelength observations of galaxy clusters. The ML approach has two components: an autoencoder that builds a compressed representation of each galaxy cluster and a flexible CNN to estimate the cosmological model from a cluster sample. From mock observations, the ML method estimates the amplitude of matter fluctuations, sigma8, at approximately the expected theoretical limit. More importantly, the deep ML approach can be understood and interpreted. I will lay out three schemes for interpreting the ML technique: a leave-one-out method for assessing cluster importance, an average saliency for evaluating feature importance, and correlations in the terse layer for understanding whether an ML technique can be safely applied to observational data. I will introduce the term “overspecialized" to describe a common pitfall in astronomical applications of machine learning in which the ML method learns simulation-specific details, and we show how a carefully sculpted architecture can be used to check for this source of systematic error.
Host: Gary Shiu
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Department Meeting
Time: 12:15 pm
Place: Virtual see "abstract" for connection info
Speaker: Sridhara Dasu, Department Chair
AIMEE N LEFKOW is inviting you to a scheduled Zoom meeting.

Topic: Department Meeting
Time: Jan 13, 2021 12:15 PM Central Time (US and Canada)
Every week on Wed, until May 12, 2021, 18 occurrence(s)
Jan 13, 2021 12:15 PM
Jan 20, 2021 12:15 PM
Jan 27, 2021 12:15 PM
Feb 3, 2021 12:15 PM
Feb 10, 2021 12:15 PM
Feb 17, 2021 12:15 PM
Feb 24, 2021 12:15 PM
Mar 3, 2021 12:15 PM
Mar 10, 2021 12:15 PM
Mar 17, 2021 12:15 PM
Mar 24, 2021 12:15 PM
Mar 31, 2021 12:15 PM
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Apr 21, 2021 12:15 PM
Apr 28, 2021 12:15 PM
May 5, 2021 12:15 PM
May 12, 2021 12:15 PM
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Meeting ID: 924 9932 5588
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Meeting ID: 924 9932 5588
Passcode: 337209
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Meeting ID: 924 9932 5588
Passcode: 337209

Host: Sridhara Dasu
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Exploring Galaxy Evolution from Radio Observations
Time: 4:00 pm
Place: Virtual
Speaker: Hansung Gim, Arizona State University
Abstract: Zoom info
Meeting ID: 93592708053, passcode: cmbadger

Or click:
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Host: Keith Bechtol
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Thursday, January 28th, 2021

Astro Tool Exchange
High Dimensional Data Visualization with Glue
Time: 10:00 am
Place: https://uwmadison.zoom.us/j/94904866198?pwd=RGNvSWxudC9sTThKOWhNV2RRTGFnUT09
Speaker: Cameren Swiggum, University of Wisconsin - Madison
Abstract: This is an informal one-hour meeting with rotating hosts. For this first installment, UW-Madison graduate student Cameren Swiggum will talk about how he uses Glue (with WorldWide Telescope) in his research workflow.

Come prepared to learn in real-time, ask questions, and *hopefully* walk away with a handy new tool in your toolbox.

Want to know more about Glue? In the link below, Chris Beaumont provides a useful walkthrough of the Glue platform at the 2013 SciPy conference:
https://www.youtube.com/watch?v=47LNpvDlKUk&ab_channel=Enthought

Feel free to download the software prior to the meeting if you'd like to try it out beforehand.
Glue installation: https://glueviz.org/install.html

Want to see your favorite tool on the Astro Tool Exchange roster? Fill out the poll below. Add missing tools using the "other" feature. The current poll results are attached (as crowd sourced on Twitter).
https://poll.app.do/which-astro-tools-are-part-of-your-workflow?fbclid=IwAR20wZwjGPUgi-XyLV1tLIwqD_OMI_3nYWrAGqbOxpT2ijvz0o1vP9y0xzY
Host: Melinda Soares-Furtado
Presentation: Astro_Tool_Exchange.pdf
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
A Quick Look at the 3GHz Radio Sky: Early Continuum Science from the VLA Sky Survey
Time: 12:00 pm
Place: Virtual
Speaker: Yjan Gordon, University of Manitoba
Abstract: Zoom info
Meeting ID: 93592708053, passcode: cmbadger

Or click:
https://uwmadison.zoom.us/j/93592708053?pwd=VWVNMDJXV2N1blV0emg4ZUg3ZGRiUT09
Host: Keith Bechtol
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Astronomy Colloquium
"Spatially Resolved Galaxy Interactions
Time: 3:30 pm
Place: Zoom meeting Coffee and tea 3:30pm, Talk 3:45 PM
Speaker: Jorge Moreno, Pomona College
Abstract: For decades, late-stage galaxy mergers have been recognized as naturally occurring events within the hierarchical LCDM paradigm, capable of triggering starburst and quasars. Early-stage mergers (interactions), albeit not as dramatic as their late-stage counterparts, are believed to shape galaxies in gentler and more long-lasting ways: by enhancing star formation, suppressing gas metallicity, igniting AGNs, augmenting H2 fuel, etc. But more importantly, their cumulative effect may ultimately stimulate the transformation of spirals into lenticulars in dense environments. The focus of this talk is to address the spatial structure and evolution of star formation and the interstellar medium (ISM) in interacting galaxies. We use an extensive suite of parsec-scale galaxy merger simulations (stellar mass ratio = 2.5:1), which employs the "Feedback In Realistic Environments-" model (FIRE-2). This framework resolves star formation, feedback processes, and the multi-phase structure of the ISM. We focus on the galaxy-pair stages of interaction. We find that close encounters substantially augment cool (HI) and cold-dense (H2) gas budgets, elevating the formation of new stars as a result. We also find that galaxies with elevated global star formation rate (SFR) experience intense nuclear SFR enhancement, driven by high levels of either star formation efficiency (SFE) or available cold-dense gas fuel. Galaxies with suppressed global SFR also contain a nuclear cold-dense gas reservoir, but low SFE levels diminish SFR in the central region. Our numerical predictions underscore the need of substantially larger, and/or merger-dedicated, spatially-resolved (integral-field spectroscopic) galaxy surveys -- capable of examining vast and diverse samples of interacting systems -- coupled with multi-wavelength campaigns aimed to capture their internal ISM structure. Zoom Link: https://uwmadison.zoom.us/j/88513896776?pwd=Y1JtRE1KZllxWkFTamJBSGtGdm9yQT09
Host: Melinda Soares-Furtado
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Friday, January 29th, 2021

Theory Seminar (High Energy/Cosmology)
Title to be announced
Time: 2:00 pm
Place: For zoom link, sign up at: https://groups.google.com/a/g-groups.wisc.edu/d/forum/theoryseminars/join
Speaker: Chandramouli Chowdhury, ICTS, Bangalore
Host: Lars Aalsma
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Department Coffee Hour
Department Coffee Hour (Virtual)
Time: 3:30 pm
Place: Virtual (see abstract for connection info)
Abstract: Topic: Department Coffee Hour
Time: Jan 29, 2021 03:30 PM Central Time (US and Canada)
Every week on Fri, until May 14, 2021, 16 occurrence(s)
Jan 29, 2021 03:30 PM
Feb 5, 2021 03:30 PM
Feb 12, 2021 03:30 PM
Feb 19, 2021 03:30 PM
Feb 26, 2021 03:30 PM
Mar 5, 2021 03:30 PM
Mar 12, 2021 03:30 PM
Mar 19, 2021 03:30 PM
Mar 26, 2021 03:30 PM
Apr 2, 2021 03:30 PM
Apr 9, 2021 03:30 PM
Apr 16, 2021 03:30 PM
Apr 23, 2021 03:30 PM
Apr 30, 2021 03:30 PM
May 7, 2021 03:30 PM
May 14, 2021 03:30 PM
Please download and import the following iCalendar (.ics) files to your calendar system.
Weekly: https://uwmadison.zoom.us/meeting/tJMkf-yqpjojHdRt7HGeqviWNpBBgTH6ardi/ics?icsToken=98tyKuCvpzMvGNyUuR6HRowEHYqgZ-rxiH5EgqdviEjNJCVCdArBGPJgELVLOI7R

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Meeting ID: 979 8528 1970
Passcode: 309601
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Meeting ID: 979 8528 1970
Passcode: 309601
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115.114.115.7 (India Hyderabad)
213.19.144.110 (Amsterdam Netherlands)
213.244.140.110 (Germany)
103.122.166.55 (Australia)
149.137.40.110 (Singapore)
64.211.144.160 (Brazil)
69.174.57.160 (Canada)
207.226.132.110 (Japan)
Meeting ID: 979 8528 1970
Passcode: 309601


Host: Climate and Diversity Committee
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