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Title:
A Map of the Cosmic Microwave Background from the BEAST Experiment
Authors:
Meinhold, Peter R.; Bersanelli, Marco; Childers, Jeffrey; Figueiredo, Newton; Gaier, Todd C.; Halevi, Doron; Huey, Gregory G.; Kangas, Miikka; Lawrence, Charles R.; Levy, Alan; Lubin, Philip M.; Malaspina, Marco; Mandolesi, Nazzareno; Marvil, Joshua; Mejía, Jorge; Natoli, Paolo; O'Dwyer, Ian; O'Neill, Hugh; Parendo, Shane; Pina, Agenor; Seiffert, Michael D.; Stebor, Nathan C.; Tello, Camilo; Villa, Fabrizio; Villela, Thyrso; Wade, Lawrence A.; Wandelt, Benjamin D.; Williams, Brian; Wuensche, Carlos Alexandre
Affiliation:
AA(Physics Department, University of California, Santa Barbara, CA 93106.; University of California, White Mountain Research Station, CA 93514.; University of California-Santa Barbara Center for High Altitude Astrophysics at White Mountain, Santa Barbara, CA 93106.), AB(University of Milano, via Celoria 16, 20133 Milano, Italy.), AC(Physics Department, University of California, Santa Barbara, CA 93106.; University of California-Santa Barbara Center for High Altitude Astrophysics at White Mountain, Santa Barbara, CA 93106.), AD(Universidade Federal de Itajubá Departamento de Física e Química Caixa Postal 50 37500-903-Itajubá, MG, Brazil.), AE(Jet Propulsion Laboratory, California Institute of Technology, Oak Grove Drive, Pasadena, CA 91109.), AF(Physics Department, University of California, Santa Barbara, CA 93106.; University of California-Santa Barbara Center for High Altitude Astrophysics at White Mountain, Santa Barbara, CA 93106.), AG(Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL 61801.; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801.), AH(Physics Department, University of California, Santa Barbara, CA 93106.; University of California-Santa Barbara Center for High Altitude Astrophysics at White Mountain, Santa Barbara, CA 93106.), AI(Jet Propulsion Laboratory, California Institute of Technology, Oak Grove Drive, Pasadena, CA 91109.), AJ(Physics Department, University of California, Santa Barbara, CA 93106.; University of California, White Mountain Research Station, CA 93514.; University of California-Santa Barbara Center for High Altitude Astrophysics at White Mountain, Santa Barbara, CA 93106.), AK(Physics Department, University of California, Santa Barbara, CA 93106.; University of California, White Mountain Research Station, CA 93514.; University of California-Santa Barbara Center for High Altitude Astrophysics at White Mountain, Santa Barbara, CA 93106.), AL(IASF-CNR sezione di Bologna, via P. Gobetti, 101, 40129 Bologna, Italy.), AM(IASF-CNR sezione di Bologna, via P. Gobetti, 101, 40129 Bologna, Italy.), AN(Physics Department, University of California, Santa Barbara, CA 93106.; University of California-Santa Barbara Center for High Altitude Astrophysics at White Mountain, Santa Barbara, CA 93106.), AO(Instituto Nacional de Pesquisas Espaciais Divisão de Astrofísica Caixa Postal 515, 12210-070-São José dos Campos, SP, Brazil.), AP(Dipartimento di Fisica e sezione INFN, Università di Roma ``Tor Vergata,'' Rome, Italy.), AQ(Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL 61801.), AR(Physics Department, University of California, Santa Barbara, CA 93106.; University of California-Santa Barbara Center for High Altitude Astrophysics at White Mountain, Santa Barbara, CA 93106.), AS(Physics Department, University of California, Santa Barbara, CA 93106.), AT(Universidade Federal de Itajubá Departamento de Física e Química Caixa Postal 50 37500-903-Itajubá, MG, Brazil.), AU(Jet Propulsion Laboratory, California Institute of Technology, Oak Grove Drive, Pasadena, CA 91109.), AV(Physics Department, University of California, Santa Barbara, CA 93106.; University of California, White Mountain Research Station, CA 93514.; University of California-Santa Barbara Center for High Altitude Astrophysics at White Mountain, Santa Barbara, CA 93106.), AW(Instituto Nacional de Pesquisas Espaciais Divisão de Astrofísica Caixa Postal 515, 12210-070-São José dos Campos, SP, Brazil.), AX(IASF-CNR sezione di Bologna, via P. Gobetti, 101, 40129 Bologna, Italy.), AY(Instituto Nacional de Pesquisas Espaciais Divisão de Astrofísica Caixa Postal 515, 12210-070-São José dos Campos, SP, Brazil.), AZ(Jet Propulsion Laboratory, California Institute of Technology, Oak Grove Drive, Pasadena, CA 91109.; Department of Applied Physics, California Institute of Technology, Pasadena, CA 91125.), BA(Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL 61801.; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801.), BB(Physics Department, University of California, Santa Barbara, CA 93106.; University of California, White Mountain Research Station, CA 93514.; University of California-Santa Barbara Center for High Altitude Astrophysics at White Mountain, Santa Barbara, CA 93106.), BC(Instituto Nacional de Pesquisas Espaciais Divisão de Astrofísica Caixa Postal 515, 12210-070-São José dos Campos, SP, Brazil.)
Publication:
The Astrophysical Journal Supplement Series, Volume 158, Issue 1, pp. 101-108. (ApJS Homepage)
Publication Date:
05/2005
Origin:
UCP
ApJ Keywords:
Cosmology: Cosmic Microwave Background, Cosmology: Observations
DOI:
10.1086/429088
Bibliographic Code:
2005ApJS..158..101M

Abstract

We present the first sky maps from the BEAST (Background Emission Anisotropy Scanning Telescope) experiment. BEAST consists of a 2.2 m off-axis Gregorian telescope fed by a cryogenic millimeter wavelength focal plane currently consisting of six Q band (40 GHz) and two Ka band (30 GHz) scalar feed horns feeding cryogenic HEMT amplifiers. Data were collected from two balloon-borne flights in 2000, followed by a lengthy ground observing campaign from the 3.8 km altitude University of California White Mountain Research Station. This paper reports the initial results from the ground-based observations. The instrument produced an annular map covering the sky over 33deg<δ<42deg. The maps cover an area of 2470 deg2 with an effective resolution of 23' FWHM at 40 GHz and 30' at 30 GHz. The map rms (smoothed to 30' and excluding Galactic foregrounds) is 57+/-5 μK (Rayleigh-Jeans) at 40 GHz. Comparison with the instrument noise and correcting for 5% atmospheric attenuation gives a cosmic signal rms contribution of 29+/-3 μK (R-J) or 30+/-3 μK relative to a Planck blackbody of 2.7 K. An estimate of the actual cosmic microwave background (CMB) sky signal requires taking into account the l space filter function of our experiment and analysis techniques, carried out in a companion paper. In addition to the robust detection of CMB anisotropies, we find a strong correlation between small portions of our maps and features in recent Hα maps. In this work we describe the data set and analysis techniques leading to the maps, including data selection, filtering, pointing reconstruction, mapmaking algorithms, and systematic effects.
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