Lecture19 - AstroNova Large Synoptic Survey Telescope...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
AstroNova Large Synoptic Survey Telescope primary mirror started U. of Arizona mirror lab 8.4 m diameter spin-casting, 7 rpm complete in July Super-WASP searches for planet transits 10 detected so far Sites in S. Africa, Canary Isl.
Background image of page 1

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

View Full DocumentRight Arrow Icon
Previous Lecture Milky Way center evidence for a million solar mass black hole galaxy classification system contents of elliptical and spiral galaxies motions in elliptical and spiral galaxies light distribution in elliptical and spiral galaxies
Background image of page 2
Quiz Question #1 Which of the following do we not find in the center of our Milky Way galaxy? A. Dense concentrations of dust B. Luminous infrared stars C. An active, on-going explosion D. A million solar mass black hole E. Compact X-ray and radio sources
Background image of page 3

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

View Full DocumentRight Arrow Icon
The Cosmic Distance Scale Distance determination is crucial to understanding galaxies and cosmology Distances are hard to determine accurately Local distance estimators determining the astronomical unit radar ranging, spacecraft telemetry trigonometric parallax – limited range main sequence fitting – only star clusters spectroscopic parallax – limited accuracy
Background image of page 4
Standard Candles If you know the intrinsic luminosity of an object, then its apparent brightness gives its distance Main sequence stars and Cepheids are examples not all Cepheids are identical, but P-L relation allows you to determine each Cepheid’s luminosity Measuring larger extragalactic distances is basically a search for brighter standard candles Not so good standard candles: H II regions, globular clusters, brightest stars, planetary nebulae, brightest cluster galaxies
Background image of page 5

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

View Full DocumentRight Arrow Icon
Cepheid Variable Stars At certain evolutionary stages, stars
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 02/08/2011.

Page1 / 24

Lecture19 - AstroNova Large Synoptic Survey Telescope...

This preview shows document pages 1 - 7. Sign up to view the full document.

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