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Upcoming Events

Event Date and Location Summary
Astronomy Colloquium: Tabetha Boyajian Thu. December 5th, 2019
3:00 pm-4:00 pm
at Sears 552

Title TBD
Tabetha Boyajian (LSU)

Continue reading… Astronomy Colloquium: Tabetha Boyajian

Astronomy Colloquium: Benne Holwerde Thu. March 5th, 2020
3:00 pm-4:00 pm
at Sears 552

Title TBA
Benne Holwerde (U Louisville)

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Past Events

Event Date Summary
Joint Astronomy and EEPS Colloquium: Emilie Dunham Thu. October 24th, 2019
3:00 pm-4:00 pm

Meteoritic Implications for the Galactic Environment of Solar System Formation
Emilie Dunham (Arizona State)

Short-lived radionuclides (SLRs) once present in the solar nebula can be used to probe the Solar System’s galactic formation environment. Isotopic analyses reveal that the first solids formed in the Solar System, calcium- and aluminum-rich inclusions (CAIs) in chondritic meteorites, formed with the live SLRs 10Be (t1/2 = 1.4 Myr) and 26Al (t1/2 = 0.7 Myr). Beryllium-10 is produced when high-energy ions, solar energetic particles or galactic cosmic rays (GCRs), spall nuclei in gas or dust. The most likely source of Solar System 10Be is inheritance of GCR-irradiated protosolar molecular cloud material,

Continue reading… Joint Astronomy and EEPS Colloquium: Emilie Dunham

Astronomy Colloquium: Sabine Hossenfelder Thu. October 17th, 2019
3:00 pm-4:00 pm

Dark matter – or what?
Sabine Hossenfelder (Franklin Institute for Advanced Studies)

In this talk I will explain (a) what observations speak for the hypothesis of dark matter, (b) what observations speak for the hypothesis of modified gravity, and (c) why it is a mistake to insist that either hypothesis on its own must explain all the available data. The right explanation, I will argue, is instead a suitable combination of dark matter and modified gravity, which can be realized by the idea that dark matter has a superfluid phase.

Continue reading… Astronomy Colloquium: Sabine Hossenfelder

Joint Astronomy and EEPS Colloquium: Peter James Thu. October 3rd, 2019
3:00 pm-4:00 pm

The crust of Mercury, as seen by the MESSENGER spacecraft
Peter James (Baylor U)

NASA’s MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft was the first craft to orbit Mercury, our solar system’s innermost planet. The MESSENGER mission team consisted of scientists from around the globe—including some from CWRU—and the data returned by MESSENGER revealed a planet unlike any other in our solar system. Mercury’s metal core is approximately 80% of the diameter of the planet, so Mercury is a type of a predominantly metal world that be orbiting around other stars. Mercury has a history of pervasive volcanic eruptions (no longer active) with distinct geochemical terranes,

Continue reading… Joint Astronomy and EEPS Colloquium: Peter James

Astronomy Colloquium: K.S. Dwarakanath Thu. September 19th, 2019
3:00 pm-4:00 pm

Diffuse Radio Emission in Galaxy Clusters
K.S. Dwarakanath (Raman Research Institute)

Galaxy clusters are some of the largest gravitationally bound structures in the Universe. Satellite observations during the early 70’s discovered diffuse X-ray emitting hot gas in the clusters. Cluster-wide non-thermal radio emission was also subsequently discovered in some of the X-ray bright clusters and has been a topic of multi-wavelength studies ever since.  This radio emission, which is not associated with any of the cluster galaxies, arises due to relativistic particles and magnetic fields in the Intra Cluster Medium and is  extended over millions of light years,

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Astronomy Colloquium: Narendranath Patra Thu. September 12th, 2019
3:00 pm-4:00 pm

The missing satellite problem and the dark galaxies
Narendranath Patra (Raman Research Institute)

Though the Lambda-CDM model of cosmology has been immensely successful in explaining the observable universe at large scales, several inconsistencies yet persist between its predictions and observations in smaller scales. The `missing satellite’ problem is one of the significant ones. The number of predicted small galaxies within the virial radii of massive galaxies is found to be an order of magnitudes higher than what is observed as luminous satellites of such galaxies. Out of many proposed solutions to this problem, the ‘HVC-minihalo’

Continue reading… Astronomy Colloquium: Narendranath Patra

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