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ACT 277 GHz Beams

Product Name
ACT 277 GHz Beam Profiles and Beam Functions
Mission
ACT

Description

The beam functions for the ACT 277 GHz maps are the amplitude of the harmonic transform of beam profiles obtained from Saturn observations. For more information see Hasselfield et al (2013), "The Atacama Cosmology Telescope: Beam Measurements and the Microwave Brightness Temperatures of Uranus and Saturn." For application to unresolved source science see Gralla et al (2019), "Atacama Cosmology Telescope: Dusty star-forming galaxies and active galactic nuclei in the equatorial survey."

These data have been used soley for the study of millimeter emission and the Sunyaev-Zel'dovich effect in compact sources. Caution is advised for studies of larger modes, as in angular power spectrum studies.

The beam profiles are given in ASCII formatted files with the following columns:

-the angle theta from beam center given in degrees
-the beam profile unit normalized at theta=0

At this time only the 2010 beam profile (act_beam_profile_277ghz_2010_desys_130224.txt) is available, corresponding to the equatorial 277 GHz data map.

The beam functions are given in ASCII formatted files with the following columns:

-the multipole moment ell
-the beam function b_l unit normalized at ell=0

At this time only the 2010 beam function (act_beam_function_277ghz_2010_desys_130224.txt) is available, corresponding to the 277 GHz equatorial data map.

A service of the HEASARC and of the Astrophysics Science Division at NASA/GSFC
Goddard Space Flight Center, National Aeronautics and Space Administration
HEASARC Director: Dr. Alan P. Smale
LAMBDA Director: Dr. Eric R. Switzer
NASA Official: Dr. Eric R. Switzer
Web Curator: Mr. Michael R. Greason