Show Notes: October 2, 2012 (GMT)
Title: Rocking out with Classical Gas
Hosts: Jesse, Paul, Ryan, Harrison
This Week in History:
4 October 1957 – Sputnik launched
1 October 1958 – NASA formed
29 September 1962 – Canada Launches Aloutte 1
5 October 1962 – ESO turns 50 founded
—-LAST TRIP of Space Shuttle Endeavour
-now in california
On 5 October 2012, the European Southern Observatory (ESO) will
broadcast A Day in the Life of ESO, a free, live event on the web, as
part of its 50th Anniversary celebrations. There will be live
observations from ESO’s flagship observatory, the Very Large Telescope
(VLT), on Cerro Paranal in Chile’s Atacama Desert, as well as
fascinating talks from astronomers at ESO’s Headquarters in Germany.
Members of the public are invited to ask questions in advance of the
event, or during the stream, by Facebook, Twitter, and email.
Read more at http://www.eso.org/public/announcements/ann12067/
pointed towards the Thor’s Helmet Nebula (by public choice), Brigitte Bailleul from france will be travelling to Cerro Paranal to make the observation with them!
—the Milky Way’s got Gas!
‘missing baryon problem’–> we think we know how much baryonic matter is out there. This is done by measuring deuterium(?) and the CMBR. Absorption a high redshifts seems to account or the total needed. But at low redshift we cannot account for all baryons (by a factor of 2).
Models predict that in the early universe, gas in the universe was colder, so it absorbed at wavelengths that are easy for us to observe now. As the universe evolved and galaxies grew, the gaseous content around the galaxies became shock heated into highly ionized states. In order to see their effects near by we need X-ray telescopes.
Mass of MW = 1.0-1.5 E12 solar masses
> 300 000 ly across = 100 kpc (distance to Andromeda is 0.7 Mpc)
going by Chen & Tinker, this is somewhat underestimating the size of this gaseous halo. (it should be between 100 < s < 150 kpc (but stll cool!)
found oxygen ions in the vicinity were ‘selectively absorbing’ some of the x-rays of distant objects. that gives temp.
temperature ~ 100 000 deg kelvin (we estimate temperatures lower)
heat means something different in space
—Meteroite skipping around the atmosphere
a metorite/asteroid being caught in earth’s gravity and entering the atmosphere a couple different times (skipping across the top of it). There was a fireball spotted in the UK a couple weeks back, and then a couple hours later a fireball was spotted over North America. Someone in Finland (if I recall correctly) did the math, and it works out that it could have been the same metorite. It hit in the UK first, some of it burnt up, and some fragments bounced off, orbited the earth a couple times, and then re-entered over the eastern US/Canada. Details: