Issues of 2007

This page lists the home pages for this web site for the year 2007. These pages constitute volume 4 of The Astrophysics Spectator.

• Issue 4.12, August 8, 2007. This issue continues the discussion of previous issues on the massive stars orbiting the central Galactic black hole. In this issue, two pages are added. The first page describes how star clusters can sink to the center of the Galaxy. The second page describes how interactions between three bodies can give a star a low-eccentricty orbit close to the black hole.
• Issue 4.11, July 25, 2007. This issue of the web site adds another page about the bright stars in close orbit around the central black hole Sgr A^* to the “Milky Way Galaxy” path. The subject of the new page is the difficulty of rapidly transporting a star born far from the central Galactic black hole to a close orbit around the black hole.
• Issue 4.10, July 11, 2007. Two pages about the bright stars orbiting Sgr A^* are added with this issue. The first page describes the characteristics of these stars and their orbits, and it discusses why the characteristics of these stars present astronomers with a difficult problem in understanding where the stars were born. The second page is a table of orbital parameters for several of these stars.
• Issue 4.09, June 13, 2007. This issue adds a prequel to last issue's pages. The new page describes the Sagittarius A complex, the collection of stars, gas, and massive black hole that sit at the center of the Milky Way Galaxy.
• Issue 4.08, May 30, 2007. Two new pages are added to the Milky Way Galaxy topical path. The first page describes how the orbiting of stars around the black hole at the center of the Galaxy gives astronomers a measure of the distance to the Galactic center. The second page presents a table of the Galaxy's physical characteristics.
• Issue 4.07, May 16, 2007. This week a page is added to the Milky Way that describes the extended structure of the Galactic center.
• Issue 4.06, April 18, 2007. The first page in a series of pages on the Milky Way Galaxy is added to the site with this issue.
• Issue 4.05, March 21, 2007. Radio pulsars provide the excuse this issue for adding a page about the structure of the Milky Way galaxy. Specifically, the page discusses the distribution of radio pulsars around the Galactic disk and its implications for the lifetime of a radio pulsar.
• Issue 4.04, February 21, 2007. With this issue, a page is added to the web site that describes the radio waves and x-rays emitted by a spin-powered pulsar.
• Issue 4.03, February 7, 2007. This issue of the web site adds a page describing the association of nebulae with radio pulsars and the connection of both to supernovae.
• Issue 4.02, January 24, 2007. A page that describes the characteristics and evolution of binary pulsars and millisecond pulsars and a page that describes tests of general relativity with binary pulsars are added to the web site with this issue.
• Issue 4.01, January 10, 2007. This issue of The Astrophysics Spectator starts the year with a page on radio pulsars, also known as spin-powered pulsars.