BayAstro – Events of Week of 04/27/2020 and Beyond

The BayAstro group publishes announcements of interesting events related to astronomy and aerospace in the San Francisco Bay Area. This can include events such as astronomy and interesting physical science lectures, club meetings, star parties, air shows and other events of interest mostly to amateur astronomers and science enthusiasts. Many thanks to Ken Lum, who created this event listing.
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Due to concerns about the spread of the Coronavirus or COVID-19 virus, some events have been or may be cancelled. Many venues will be closed to the end of March and some, perhaps, into April. Other events may offer online links and connections. To check on the status of a given event, check their website for updates.
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Monday, 04/27/20 12:00 PM

Campbell Hall, Rm 131
UC Berkeley
Berkeley, CA 94720

Not sure if this event is being held virtually. Can contact this person for inquiries.
Mark Hayden, the TAC’s Administrative Assistant, at markhayden@…

Supermassive black hole binaries in the era of multi-messenger astrophysics

Speaker: Tamara Bogdanovic, Georgia Tech

Website: https://tac.berkeley.edu/monday-tac-seminar/

Cost: Free

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Tuesday, 04/28/20
11:00 AM – 12:00 PM

Kavli Institute for Particle Astrophysics
Zoom: https://stanford.zoom.us/j/550904854

Charge Exchange in the Solar System and Beyond – Livestream

Charge exchange (CX) is a conceptually simple but theoretically complex atomic process that leads to spectral line emission in the X-ray band, only discovered to be important in astronomy in the last few decades. It occurs in nearly any environment where hot plasma and cold gas interact: in the solar system, between solar wind ions and neutrals in comets and planetary atmospheres, and likely also astrophysically, in, for example, supernova remnants and galaxy clusters. CX models suffer from a lack of accurate atomic data, however, and often do not match laboratory benchmarks. This can negatively impact current and future observations, leading to an improperly subtracted X-ray foreground, incorrect assumptions about the physical properties of our astrophysical targets, and missed opportunities to harness the diagnostic utility of CX. I will discuss how CX can impact our observations from current (XMM, Chandra) and future (XRISM, Athena/X-IFU) missions, the atomic data needs for CX models, and how laboratory astrophysics is a critical component of an improved CX theory.
Speaker: Gabriele Betancourt-Martinez, IRAP/CNRS (Toulouse)

See weblink for Zoom information.

Website: https://kipac.stanford.edu/events/charge-exchange-solar-system-and-beyond

Cost: Free

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Tuesday, 04/28/20 1:10 PM

UC Berkeley
By Zoom

The three most curious things from one year of DES weak lensing – Livestream

The Dark Energy Survey has finished cosmological and other lensing results from one year of collected data. I will revisit three findings that were perhaps unexpected but seem curious (at least to me!), on the side of the main two-point function results on cosmology. One is the ongoing controversy on calibration of photometric redshifts. Another are the anomalously low counts and lensing signals we have measured for low-mass optically selected clusters. A third one is the first detection, and somewhat unexpected behavior, of the cross-correlation of weak gravitational lensing with extragalactic gamma- rays. I will also discuss progress towards the one most curious thing from three years of DES weak lensing data, to come out soon.

Speaker: Dan Gruen, Stanford

Website: https://cosmology.lbl.gov/sem_bcg_future.html

Cost: Free

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Thursday, 04/30/20
11:00 AM – 12:00 PM

KIPAC Astrophysics Colloquium
Zoom: https://stanford.zoom.us/j/423773826

Astrochemistry and Compositions of Planetary Systems – Livestream

The past decades have revealed that planets are incredibly common, and incredibly diverse. The origins of planets and their compositions are intimately linked to the chemical environments within which planets assemble, i.e. to the chemistry of planet-forming disks. The arrival of ALMA has provided observational access to disk chemistry, revealing snowlines, complex organic molecules, and curious chemical gradients across the planet and comet forming zones. In parallel, astrochemistry models and laboratory experiments are providing new clues on what chemistry is likely to occur in different disk environments. I will present some of our latest observational and laboratory discoveries on the chemistry of protoplanetary disks, and discuss how this chemistry might shape the outcome of planet formation, the chemical habitability of mature planetary systems, and the composition of our own Jupiter.

Speaker: Karin Oberg, Harvard Univ.

Website: https://kipac.stanford.edu/events/astrochemistry-and-compositions-planetary-systems

Cost: Free

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Friday, 05/01/20
10:30 AM – 11:30 AM

Kavli Institute for Particle Astrophysics
Zoom info: https://stanford.zoom.us/j/550904854

Spatially Resolved UV Diagnostics of AGN Feedback: Radiation Pressure Dominates in a Prototypical Quasar-driven Superwind- Livestream

Galactic-scale winds driven by active galactic nuclei (AGN) are often invoked to suppress star formation in galaxy evolution models, but the mechanisms driving these outflows are hotly debated. Two key AGN feedback models are (1) radiation pressure accelerating cool gas and (2) a hot outflowing wind entraining the interstellar medium (ISM). Highly ionized emission-line diagnostics represent a powerful means of differentiating these scenarios because of their sensitivity to the expected compression of the ISM clouds by the hot wind. Here, we report the first spatially resolved UV emission spectroscopy of a prototypical (radio-quiet) quasar-driven superwind around the obscured quasar SDSS J1356+1026 at z = 0.123. We observe ratios of O vi/C iv, N v/C iv, and C iv/He ii that are remarkably similar for outflowing gas clouds ≲100 pc and ≈10 kpc from the nucleus. Such similarity is expected for clouds with AGN radiation-pressure-dominated dynamics. Comparing the observed line emission to models of clouds in balance with radiation pressure and/or a hot wind, we rule out the presence of a dynamically important hot wind and constrain the ratio of hot gas pressure to radiation pressure to Phot/Prad ≲ 0.25 both at ≲100 pc and ≈10 kpc from the nucleus. Moreover, the predictions of the radiation pressure confined cloud models that best fit observed UV line ratios are consistent with the observed diffuse X-ray spectrum. These results indicate that this AGN superwind is driven by radiation pressure or was driven by a hot wind that has since dissipated despite ongoing AGN activity

Speaker: Sean Johnson, Princeton

See weblink for Zoom information

Website: https://kipac.stanford.edu/events/spatially-resolved-uv-diagnostics-agn-feedback-radiation-pressure-dominates-prototypical

Cost: Free

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Friday, 05/01/20
08:00 PM – 09:00 PM

Chabot Space and Science Center

Star Stories: Learn the mythology behind the constellations! – Livestream

Join us on Facebook Live and listen to Doug Olsen, expert stargazer and storyteller, explain the mythology behind the constellations. He will tell ancient stories from the night sky as seen throughout history and look for planets and other clues to help orient you to the night’s sky.

See weblink for connection information

Website: https://chabotspace.org/calendar/star-stories

Cost: Free

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Sunday, 05/03/20
08:00 PM – 10:00 PM

City Star Parties – Point Lobos
USS San Francisco Memorial
El Camino Del Mar
San Francisco, CA 94121

City Star Party – Lands End

Come join us for our monthly San Francisco City Star Party. SFAA members provide telescopes for your viewing pleasure.
Be sure to check the SFAA website for the latest updates…bad weather or overcast skies will cancel! Also check website on updates regarding COVID-19 restrictions.

Website: https://www.sfaa-astronomy.org/event/san-francisco-city-star-party-lands-end-5/?instance_id=1704

Cost: Free

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Tuesday, 05/05/20
11:00 AM – 12:00 PM

Kavli Institute for Particle Astrophysics
Zoom: https://stanford.zoom.us/j/550904854

The latest results from LIGO and Virgo – Livestream
Speaker: Jess McIver, Univ. of British Columbia

See weblink for Zoom link

Website: https://kipac.stanford.edu/events/latest-results-ligo-and-virgo

Cost: Free

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Tuesday, 05/05/20 1:10 PM

UC Berkeley Cosmology Talk
Campbell Hall, Rm 131
UC Berkeley
Berkeley, CA 94720
By Zoom: Check website

Title: tab
Speaker: Alexandra Amon, Stanford

Website: https://cosmology.lbl.gov/sem_bcg_future.html

Cost: Free

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Friday, 05/08/20
08:00 PM – 09:00 PM

Chabot Space and Science Center
See weblink for connection information

Defending Earth With Chabot’s Newest Telescope – Livestream

Join astronomer Gerald McKeegan for a tour of Chabot’s newest and most powerful telescope, the 36-inch reflector named Nellie. Learn how Chabot astronomers use Nellie to search for and track near-Earth asteroids that might someday threaten our planet.

Website: https://chabotspace.org/calendar/defending-earth-with-chabots-newest-telescope

Cost: Free

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