White Mountain Collaboration Data Products at LAMBDA

(see Smoot, G.F. et al. 1983, Phys.Rev.Lett. 51, 1099 ADS, and Smoot, G.F. et al. 1985, Ap.J., 291, L23 ADS)


Radiometer properties
Frequency
(GHz)
 System bandwidth
(GHz)		 Antenna Half-power beam
width (deg)		 System noise
(K/Hz1/2)		 Laboratory
(Ref)
2.5 0.160 12.5 0.2 Milano (1)
4.75 0.160 12.5 0.1 Bologna (2)
9.4(*) 1 12.6 0.1 Haverford (3,4)
10.0 0.910 12.5 0.05 Berkeley (5)
33.0 1 7.5 0.08 Berkeley (6)
90.0 2 7.5 0.1 Berkeley (7)

(*) entirely dedicated to study the atmospheric emission

(1) Sironi G. and Bonelli G., 1986, ApJ, 311, 418
(2) Mandolesi N. et al 1986, Ap.J. 310, 561
(3) Partridge R.B. et al., 1984, Phys.Rev. D, 29, 2683
(4) Danese L. and Partridge R.B., 1989, ApJ 342, 604
(5) Kogut A. et al., 1988, ApJ, 325, 1
(6) De Amici G. et al., 1985, ApJ , 298, 210
(7) Witebsky C. et al., 1986, ApJ, 310, 145


Antenna Temperature of Cold Load and its components
Frequency
(GHz)
 Eccosorb (o)
(mK)		 Windows + gas
(mK)		 Dewar walls
(mK)		 Reflected signals
(mK)		 Total
(mK)
2.5 3716±4 4±2 1209±210 (a)
1458±120 (b)		 70±25 (a)
340±50 (b)		 4999±212 (a)
5518±130 (b)
4.75 3663±4 5±2 8±7 40±30 (a)
6±4 (b)		 3716±31 (a)
3682±10 (b)
10 3541±4 5±2 9±5 7±4 3562±10
33 3039±4 4±2 5±5 20±6 3068±9
90 2020±4 18±3 10±10 35±35 2083±37

(o) Eccosorb/Liquid Helium physical temperature 3776±4 mK,
(a) 1982 value,
(b) 1983 value


Measurements (representative values)
Frequency
(GHz)
 TA,load
(mK)		 ΔT
(sky-load)
(mK)		 ΔToffset
(mK)		 Tground
(mK)		 Tatmosphere
(mK)		 TGalaxy
(mK)		 Year
2.5 4999±212
5518±130		 -1401±100
-1557±58		 (a)
(a)		 12±10
6±10		 950±50
950±50		 148±30
200±30		 1982
1983
4.75 3716±31
3682±10		 940±80
-45±13		 960±160
0±20		 30±10
20±20		 1000±100
997±70		 40±30
35±25		 1982
1983
9.4 --
--		 --
--		 --
--		 30±10
8±5		 1030±30
103±30		 <30±10
<10±5		 1982
1983
10 3562±10 57±4
43±7		 0±40
0±30		 0±3
0±3		 930±160
1200±130		 3±3
4±2		 1982
1983
33 3068±9 3860±40
3540±30		 -100±50
-30±30		 1±1
1±1		 4850±140
4530±90		 1±1
1±1		 1982
1983
90 2083±17 11340±60
8780±37		 0±300
10±9		 1±1
1±1		 12600±590
9870±90		 0±1
0±1		 1982
1983

(a)included in TA,load


Final results
Frequency
(GHz)
 Number of
observations		 CMB antenna
temperature
(K)		 CMB thermodynamic
temperature
(K)		 Combined 1982
and 1983 results
(K)
2.5 6
18		 2.48±0.14
2.81±0.07		 2.54±0.14
2.87±0.07		 2.79±0.15
Ref.1
4.75 5
38		 2.63±0.21
2.59±0.08		 2.73±0.22
2.70±0.07		 2.70±0.07
Ref.2
10 82
59		 2.43±0.12
2.40±0.14		 2.66±0.12
2.63±0.14		 2.65±0.09
Ref.5
33 21
32		 2.10±0.20
2.09±0.13		 2.82±0.21
2.81±0.14		 2.81±0.12
Ref.6
90 29
49		 1.00±0.57
0.99±0.09		 2.58±0.79
2.57±0.12		 2.57±0.12
Ref.7

For Columns 2-4, the first row is for 1982 data and the second row is for 1983 data.

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