Dragovan et al. (Python I), Ruhl et al. (Python II), and Platt et al. (Python
III) use 90 GHz data from the ground-based Python experiments at the South Pole
to constrain CMBR anisotropy. Rocha et al. summarize these Python experiments.
Python I and II data were taken at a single telescope elevation. Python III
data were taken at this fiducial elevation as well as two additional elevations
offset above and below the fiducial elevation. The chopper throw and azimuthal
telescope beam switching were both on the sky for the
Python I and II observations. The first series of Python III measurements,
hereafter IIIL, also used these chopper and beam switch parameters. The second
series of Python III measurements, hereafter IIIS, were made with both the
chopper throw and telescope beam switch reduced to on the sky.
The FWHM of the beam, assumed to be gaussian, is
(one standard deviation uncertainty). As discussed in
Platt et al. and Rocha et al., the Python III beam was smeared to a FWHM of
(one standard deviation
uncertainty). The zero-lag window function of the four-beam experiment is
The first column in the window function file
is , which runs from
2 to 750. The second, third, and fourth columns are zero-lag 's for
Python I/II, IIIL, and IIIS, respectively.
The quoted bandtemperature values are from Rocha et al.. They were computed
assuming a flat bandpower spectrum, and account for the Python absolute
calibration uncertainty of 20%, as well as the beamwidth uncertainty,
following Ganga et al. (see discussion in Rocha et al.).
Rocha et al. also use the Python I, II, and III data to constrain cosmological
Link to the experiment webpage.
M. Dragovan, J.E. Ruhl, G. Novak, S.R. Platt, B. Crone, R. Pernic, and
J.B. Peterson, ``Anisotropy in the Microwave Sky at Intermediate Angular
Scales", Astrophys. J. Lett. 427, L67 (1994).
K. Ganga, B. Ratra, J.O. Gundersen, and N. Sugiyama, ``UCSB South Pole
1994 Cosmic Microwave Background Anisotropy Measurement Constraints on
Open and Flat- Cold Dark Matter
Cosmogonies",Astrophys. J. 484, 7
S.R. Platt, J. Kovac, M. Dragovan, J.B. Peterson, and J.E. Ruhl, ``Anisotropy
in the Microwave Sky at 90 GHz: Results from Python III", Astrophys. J.
Lett. 475, L1 (1997).
G. Rocha, R. Stompor, K. Ganga, B. Ratra, S.R. Platt, N. Sugiyama, and
K.M. Górski, ``Python I, II, and III Cosmic Microwave Background
Anisotropy Measurement Constraints on Open and Flat- Cold
Dark Matter Cosmogonies", Astrophys. J. 525, 1
J.E. Ruhl, M. Dragovan, S.R. Platt, J. Kovac, and G. Novak,
``Anisotropy in the Microwave Sky at 90 GHz: Results from Python II",
Astrophys. J. Lett. 453, L1