4 ms·
has the link changed? it doesn't describe measuring galactic rotation (does it?) (and how do you do that with the hydrogen line? what frequency accuracy do yo
by andrewcooke 13y ago
has the link changed? it doesn't describe measuring galactic rotation (does it?) (and how do you do that with the hydrogen line? what frequency accuracy do you need?)
but as it says in the conclusions, this is way cool. as part of my degree i used equipment from early radio work - my results were similar (well, worse - all i could see was the sun and cas a) but used a bed-sized aerial, fancy switching (tube?) amplifiers (that used ~20U rack space, in todays units), and lots of liquid N2 (i guess it was a bolometer? can't remember any details...)
- mdturnerphys 13y agoThe paper doesn't specifically talk about galactic rotation, but it does demonstrate the measurement of velocities via the Doppler shift. Take a look at the plot on pg. 12, that shows "a 'triple humped' spectral structure, indicating that at the time of the observation, there were three distinct hydrogen clouds within the field-of-view of the radio telescope." I'll correct the title.