Final candidate for Newark Faculty Position - 11:30 am in 4138 PRB TODAY (Wednesday March 5)

[Shelley Palmer]

Folks,

The final candidate for the faculty position in Physics at Newark will be presenting a Special Colloquium this morning.  Please come and support the Regional campus search.

Details follow:

Time:  11:30 am - reception begins at 11:15 am outside 4138 PRB
Place:  4138 PRB

Speaker: Michael Stamatikos (OSU)
Title:  “Interdisciplinary Astrophysics with Gamma-Ray Bursts”

Abstract:  Gamma-Ray Bursts (GRBs) are cosmological beacons of transient high-energy radiation that have challenged astrophysicists for over four decades. Since their serendipitous discovery in the 1970’s, an international ensemble of dedicated satellite missions, such as "Swift" and "Fermi", in concert with ground-based multi-wavelength observatories, have identified these phenomena as relativistic sirens heralding the “death cry” from merging (binary) stellar companions and imploding massive stars. GRBs release more energy in just a few fleeting seconds than the Sun over its ∼10 billion year lifetime and ultimately result in one of Nature’s most enigmatic creations: a black hole. Despite great strides made by the broad band electromagnetic observations of over 5,000 GRBs, their progenitor(s), central engine(s) and emission mechanism(s) are still not well understood. I will discuss ongoing interdisciplinary research initiatives anchored upon an exploration of GRB astrophysics via a multi-messenger paradigm that leverages the scientific synergy afforded by "Swift", "Fermi" and "IceCube", in the context of results from the GRB Temporal Analysis Consortium (GTAC) - a team of theorists and observers that have strategically focused upon spectral variation studies of GRB (temporal) light curves. GTAC key projects include the analysis of empirical correlations amongst observables, such as the spectral lag, i.e. the relative time delay between pulses in differing energy bands, and luminosity, i.e. the intrinsic brightness. I will discuss a method for systematically calculating spectral lags with errors and its usage as a discriminator for (short/long) GRB duration classification and proxy for redshift, via the lag-luminosity relation (LLR). The unprecedented ensemble of correlated high-energy astroparticle observations has optimized the discovery potential via: increasing the degree of correlation for the LLR in the source-frame energy bands of 100-150 keV and 200-250 keV, extending the LLR over ~5 decades in time/energy scales and revealing a similarity in lag phenomenology between prompt gamma-ray pulses and afterglow x-ray flares, thus suggesting a common origin.






Shelley

[The Ohio State University]
Shelley Palmer
Administrative Associate to the Chair
Department of Physics
1040P Physics Research Building, 191 W. Woodruff Avenue, Columbus, OH 43210
(614) 292-2653 Office
palmer.14 at osu.edu<mailto:palmer.14 at osu.edu> osu.edu<http://osu.edu>

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