GammaRayBurstsforclass

GammaRayBurstsforclass - Gamma Ray Bursts -- What are They...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Gamma Ray Bursts -- What are They & What Makes Them? (Mystery #5) Astr 2340 Spring 2010 R. Chandar-- The Biggest Bang since the Big one-- Gamma ray bursts are the most powerful cosmic explosions ever witnessed by humans. The mystery is that we dont know whats exploding (Bennett). Review Questions: Review Questions: 1. What is a cosmic ray? What is a gamma ray? 2. What is more common - high E or low E cosmic rays? Where do we think the majority of low E cosmic rays come from? 3. What is a cosmic ray shower and generally how does one work? 4. What is Cherenkov radiation? Air showers of secondary CRs The frst Gamma-ray Burst Discovered in 1967 while looking For nuclear test explosions - a 30+ year old mystery! Vela satellite History of the discovery of Gamma Ray Burst sources: ______________________________________________ 1960 US launched VELA satellites to monitor Nuclear Test Ban Treaty signed with the Soviet Union VELA satellites were equipped with gamma ray detectors, designed to detect gamma ray bursts produced in thermonuclear explosions. Surprise!!! Many gamma ray burst were detected, but signals came from space, not from the Earth surface or atmosphere. For ~ 30 years, the origin of the cosmic gamma ray bursts was a mystery. Late 1990s: Mystery is solved (we think) Gamma Rays are photons of the highest energy found in the electromagnetic spectrum. They are emitted from extremely hot environments, e.g. in nuclear explosions. Today we have satellites specifcally designed to detect gamma ray bursts. Note, gamma rays are unable to penetrate the Earths atmosphere and must thereFore be observed From space. The Earth atmosphere has only two windows for electromagnetic radiation: 1. Visible 2. Radio All other parts of the electromagnetic spectrum need to be observed from high-Fying airplanes, balloons, and satellites in Earth orbit. Distributions If sources are located randomly in space, the distribution is called isotropic If the sources are concentrated in a certain region or along the galactic plane, the distribution is anisotropic Observed Gamma-ray Burst Sky...
View Full Document

Page1 / 31

GammaRayBurstsforclass - Gamma Ray Bursts -- What are They...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online