Cosmology W13 - Physics Department, UCSB
Cosmology W13 - Physics Department, UCSB
Cosmology W13 - Physics Department, UCSB
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Some useful concepts/units <br />
• Apparent magnitudes: flux in “funny” units <br />
– Magnitude m=-‐2.5 log F/Fo; e.g. Fo can be flux of <br />
Vega <br />
– LeZers indicate band, i.e. through a standard filter. <br />
For example B=blue band, V=visual, g=green. There is <br />
a whole zoology of bands <br />
• Absolute Magnitude is luminosity in funny units, <br />
defined as the apparent magnitude of an object <br />
at a distance of 10 pc <br />
– Sun is M V =-‐4.83 <br />
– Andromeda M V ~-‐20
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