iden8ca8on of any wavelengths absorp8on line emission

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Unformatted text preview: sity, since detona8on of 1.4M¤༊ white dwarf •  Very luminous: 10__L¤༊ at peak. •  Measure the flux, derive distance – need to be careful ____ flux is measured •  Works clear ______ Universe •  Popula8on ___ stars Dis8nc8ve spectra show ___ hydrogen lines and ______ absorp8on 4/23/2013 UW, ASTR 323, SP13, Eric Agol ©2013 9 Standard candles? •  Type Ia supernovae show slight differences in peak _________ and _________ •  By measuring the rate of decline, then stretching in the 8me direc8on and shiOing in the flux direc8on, all Type Ia’s look the same •  So they aren’t quite “standard” candles, but are _____________ 4/23/2013 UW, ASTR 323, SP13, Eric Agol ©2013 10 Measuring redshiO 4/23/2013 UW, ASTR 323, SP13, Eric Agol ©2013 11 Measuring redshiO λ 1 + z = observed λemitted !! •  Iden8fica8on of any ___ wavelengths (absorp8on line, emission line or ____) € suffices: λ 1 ,obs λ !! 2 ,obs = = •  Then redshiO can be computed once lines are iden8fied € •  Different lines are used at different redshiOs 4/23/2013 UW, ASTR 323, SP13, Eric Agol ©2013 12 Hubble’s law •  Rela8on be...
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This document was uploaded on 04/05/2014.

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