The Milky Way Galaxy’s Global Order And Mirror-Image Symmetry, Co-Rotation Radius, And The Local Incoming Mass
Share This:
                           

About The Author

Jacques' areas of interest include polarimetry, magnetic fields, Galactic structure, spiral arms in the Milky Way, and offsets between chemical tracers of a spiral arm.

Over his career, he employed the 46-meter Algonquin Radio Observatory from 1969 to 1987 (polarimeter, spectrometer, camera), and the 15-meter James Clerk Maxwell Telescope from 1990 to 2010 (polarimeter, spectrometer,  camera).

In 1988, he took a NRC-paid sabbatical leave in Grenoble, France, and from 1989 to 1991 he was Canada’s representative at the JCMT headquarters at ROE in Edinburgh, Scotland.

He is the author or co-author of around 160 refereed papers in the professional literature [ApJ, AJ, A&A, MNRAS, ApJSS, etc], as well as over 220 edited papers for the general public [JRASC, Cassiopeia, Protostar, Bull AAS, Astronomie Québec, etc].

                       

The Milky Way Galaxy’s Global Order And Mirror-Image Symmetry, Co-Rotation Radius, And The Local Incoming Mass

Can we "slice" a spiral arm into its components and order the slices? The Moon orbits around the Earth on a rough circle, the Earth orbits on a rough circle around the Sun, and the Sun orbits on a rough circle around the Center of our Galaxy known as the Milky Way. Gravitation is the force that keeps these circular orbits around a more massive object; the orbits are not quite a perfect circle, as local tides or other effects...

Read more

Overview Of Our Current Understanding Of Galactic Spiral Arms In The Milky Way

How far are we from the Center of the Galaxy? How far is the Sun from the center of the Milky Way (Galactic Center, GC)? Quite a few recent publications have appeared in the last 3 years on this hot topic. Many recent determinations of the distance from the Sun to the Galactic Center hover around 8.0 kpc (about 25 000 lightyears), and not 8.3 or 8.5 kpc as before. In the galactic map below, the Sun is often replaced...

Read more