paper

UCSB South Pole 1994 CMB anisotropy measurement constraints on open and flat-Lambda CDM cosmogonies

arXiv:astro-ph/9602141 · doi:10.1086/304296

Abstract

We develop methods to account for experimental and observational uncertainties in likelihood analyses of data from cosmic microwave background (CMB) anisotropy experiments and apply them to an analysis of the UCSB South Pole 1994 (SP94) experiment. Observationally motivated open and spatially-flat $I^$ , cold dark matter cosmogonies are considered. Among the models we consider, the full SP94 data set is most consistent with $I^c ◯_{0} \sim 0.1 - 0.2$ open models and less so with old $(t_0 \gap 15 - 16 Gyr)$, high baryon density $(Î©_B \gap 0.0175 h^{-2})$, low density ( $I^c ◯_{0} \sim 0.2 - 0.4), f l a t -$ Î $m o d e l s . T h e S P 94 d a t a d o n o t r u l eo u t an y o f t h e m o d e l s w eco n s i d er a tt h e$ 2Ï $l e v e l . T h e S P 94 e x p er im e n t i s m os t se n s i t i v e t o ani so t r o p i eso na so m e w ha tl a r g er, m o d e l - d e p e n d e n t, an g u l a r sc a l e t han t h esc a l e a tw hi c h t h e w in d o w f u n c t i o n p e ak s . F or es t ab l i s hin g t h es i g ni f i c an ceo f a d e t ec t i o n o f C M B ani so t r o p y w e d er i v e l imi t s u s in g t h e hi g h es tp os t er i or d e n s i t y (H P D) p r escr i pt i o n, s in ce i t y i e l d ss ma l l er l o w er l imi t s . S in ceH P D l imi t s l e a d t o t i g h t er co n s t r ain t so n t h e C M B am pl i t u d e, t h ey a l so p r o v i d e f or g r e a t er d i scr imina t i o nb e tw ee nm o d e l s . M o d e l n or ma l i z a t i o n s d e d u ce df r o m t h e S P 94 d a t a s u b se t s a r e m os tl y co n s i s t e n tw i t h t h ose d e d u ce df r o m t h e tw o - y e a r C O B E - D M R d a t a, a l t h o ug h t h eK a - ban dd a t a p r e f er an or ma l i z a t i o n$ \sim 1Ï $l o w er t han d o t h e Q - ban dd a t a, t h e Q an d K a + Q d a t a f a v o u r a s l i g h tl y hi g h er n or ma l i z a t i o n f or t h e$ Î©_0 = 0.1 $o p e nm o d e l t han d oes t h eD M R, an d t h eK aan d K a + Q d a t a p r e f er a so m e w ha tl o w er n or ma l i z a t i o n f or t h eo l d er, hi g h er$ Î©_B $, l o w - d e n s i t y$ Î$ models than does the DMR.

Substantially shortened and rewritten. Accepted by ApJ. PostScript. 49 pages of text + tables. 16 pages of figures