Data di Pubblicazione:
2014
Abstract:
This paper presents the characterization of the in-flight beams, the
beam window functions, and the associated uncertainties for the Planck
Low Frequency Instrument (LFI). Knowledge of the beam profiles is
necessary for determining the transfer function to go from the observed
to the actual sky anisotropy power spectrum. The main beam distortions
affect the beam window function, complicating the reconstruction of the
anisotropy power spectrum at high multipoles, whereas the sidelobes
affect the low and intermediate multipoles. The in-flight assessment of
the LFI main beams relies on the measurements performed during Jupiter
observations. By stacking the datafrom multiple Jupiter transits, the
main beam profiles are measured down to -20 dB at 30 and 44 GHz, and
down to -25 dB at 70 GHz. The main beam solid angles are determined to
better than 0.2% at each LFI frequency band. The Planck pre-launch
optical model is conveniently tuned to characterize the main beams
independently of any noise effects. This approach provides an optical
model whose beams fully reproduce the measurements in the main beam
region, but also allows a description of the beams at power levels lower
than can be achieved by the Jupiter measurements themselves. The
agreement between the simulated beams and the measured beams is better
than 1% at each LFI frequency band. The simulated beams are used for the
computation of the window functions for the effective beams. The error
budget for the window functions is estimated from both main beam and
sidelobe contributions, and accounts for the radiometer bandshapes. The
total uncertainties in the effective beam window functions are: 2% and
1.2% at 30 and 44 GHz, respectively (at l ≈ 600), and 0.7% at 70
GHz (at l ≈ 1000).
beam window functions, and the associated uncertainties for the Planck
Low Frequency Instrument (LFI). Knowledge of the beam profiles is
necessary for determining the transfer function to go from the observed
to the actual sky anisotropy power spectrum. The main beam distortions
affect the beam window function, complicating the reconstruction of the
anisotropy power spectrum at high multipoles, whereas the sidelobes
affect the low and intermediate multipoles. The in-flight assessment of
the LFI main beams relies on the measurements performed during Jupiter
observations. By stacking the datafrom multiple Jupiter transits, the
main beam profiles are measured down to -20 dB at 30 and 44 GHz, and
down to -25 dB at 70 GHz. The main beam solid angles are determined to
better than 0.2% at each LFI frequency band. The Planck pre-launch
optical model is conveniently tuned to characterize the main beams
independently of any noise effects. This approach provides an optical
model whose beams fully reproduce the measurements in the main beam
region, but also allows a description of the beams at power levels lower
than can be achieved by the Jupiter measurements themselves. The
agreement between the simulated beams and the measured beams is better
than 1% at each LFI frequency band. The simulated beams are used for the
computation of the window functions for the effective beams. The error
budget for the window functions is estimated from both main beam and
sidelobe contributions, and accounts for the radiometer bandshapes. The
total uncertainties in the effective beam window functions are: 2% and
1.2% at 30 and 44 GHz, respectively (at l ≈ 600), and 0.7% at 70
GHz (at l ≈ 1000).
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
methods: data analysis; cosmic background radiation; telescopes
Elenco autori:
P., Collaboration; N., Aghanim; C., Armitage Caplan; M., Arnaud; M., Ashdown; F., Atrio Barandela; J., Aumont; C., Baccigalupi; A. J., Banday; R. B., Barreiro; E., Battaner; K., Benabed; A., Beno�t; A., Benoit L�vy; J., Bernard; M., Bersanelli; P., Bielewicz; J., Bobin; J. J., Bock; A., Bonaldi; J. R., Bond; J., Borrill; F. R., Bouchet; M., Bridges; M., Bucher; C., Burigana; R. C., Butler; J., Cardoso; A., Catalano; A., Chamballu; L., Chiang; P. R., Christensen; S., Church; S., Colombi; L. P., L.; B. P., Crill; A., Curto; F., Cuttaia; L., Danese; R. D., Davies; R. J., Davis; P. d., Bernardis; A. d., Rosa; G. d., Zotti; J., Delabrouille; C., Dickinson; J. M., Diego; H., Dole; S., Donzelli; O., Dor�; M., Douspis; X., Dupac; G., Efstathiou; T. A., En�lin; H. K., Eriksen; F., Finelli; O., Forni; M., Frailis; E., Franceschi; T. C., Gaier; S., Galeotta; K., Ganga; M., Giard; Y., Giraud H�raud; J., Gonz�lez Nuevo; K. M., G�rski; S., Gratton; A., Gregorio; A., Gruppuso; F. K., Hansen; D., Hanson; D., Harrison; S., Henrot Versill�; C., Hern�ndez Monteagudo; D., Herranz; S. R., Hildebrandt; E., Hivon; M., Hobson; W. A., Holmes; A., Hornstrup; W., Hovest; K. M., Huffenberger; A. H., Jaffe; T. R., Jaffe; J., Jewell; W. C., Jones; M., Juvela; P., Kangaslahti; E., Keih�nen; R., Keskitalo; K., Kiiveri; T. S., Kisner; J., Knoche; L., Knox; M., Kunz; H., Kurki Suonio; G., Lagache; A., L�hteenm�ki; J., Lamarre; A., Lasenby; R. J., Laureijs; C. R., Lawrence; J. P., Leahy; R., Leonardi; J., Lesgourgues; M., Liguori; P. B., Lilje; M., Linden V�rnle; V., Lindholm; M., L�pez Caniego; P. M., Lubin; J. F., Mac�as P�rez; D., Maino; N., Mandolesi; M., Maris; D. J., Marshall; P. G., Martin; E., Mart�nez Gonz�lez; S., Masi; M., Massardi; S., Matarrese; F., Matthai; P., Mazzotta; P. R., Meinhold; A., Melchiorri; L., Mendes; A., Mennella; M., Migliaccio; S., Mitra; A., Moneti; L., Montier; G., Morgante; D., Mortlock; A., Moss; D., Munshi; P., Naselsky; P., Natoli; C. B., Netterfield; H. U., N�rgaard Nielsen; D., Novikov; I., Novikov; I. J., O'Dwyer; S., Osborne; F., Paci; L., Pagano; D., Paoletti; B., Partridge; F., Pasian; G., Patanchon; O., Perdereau; L., Perotto; F., Perrotta; E., Pierpaoli; D., Pietrobon; S., Plaszczynski; P., Platania; E., Pointecouteau; G., Polenta; N., Ponthieu; L., Popa; T., Poutanen; G. W., Pratt; G., Pr�zeau; S., Prunet; J., Puget; J. P., Rachen; R., Rebolo; M., Reinecke; M., Remazeilles; S., Ricciardi; T., Riller; G., Rocha; C., Rosset; G., Roudier; Mart�n, J. A. Rubi�o.; B., Rusholme; M., Sandri; D., Santos; D., Scott; M. D., Seiffert; E. P., S.; L. D., Spencer; J., Starck; V., Stolyarov; R., Stompor; F., Sureau; D., Sutton; A., Suur Uski; J., Sygnet; J. A., Tauber; D., Tavagnacco; Terenzi, Luca; L., Toffolatti; M., Tomasi; M., Tristram; M., Tucci; J., Tuovinen; M., T�rler; G., Umana; L., Valenziano; J., Valiviita; B. V., Tent; J., Varis; P., Vielva; F., Villa; N., Vittorio; L. A., Wade; B. D., Wandelt; A., Zacchei; A., Zonca
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