Millimetric observations with a high-altitude 2.6-m ground based telescope

De Petris, M. and Melchiorri, F. and Orlando, A. and Lamagna, L. and D'Alba, L. and Colafrancesco, S. and Rephaeli, Y. and Signore, M. and Kreysa, E. and Castagnoli, C. and Romero, A. and Vallania, P. and Vernetto, S. and Saavedra, O. (2001) Millimetric observations with a high-altitude 2.6-m ground based telescope. Il nuovo cimento C, 24 C (4\5). pp. 651-656. ISSN 1826-9885

ncc8755.pdf - Published Version

Download (143kB) | Preview
Official URL:


High atmospheric performances are necessary to ensure efficient sub/millimetre cosmological observations from ground. Low atmospheric components fluctuations along the line of sight are a must for best detector applications. Such site constraints are attained only at in specific places around the world: highaltitude observatories or, equivalently, polar regions. We are currently involved in cosmological observations with the MITO project from an Alpine ground station which satisfies such requirements: the Testa Grigia mountain at 3500 m a.s.l., AO—Italy. The Chacaltaya laboratory at 5200 m a.s.l. could also be an appropriate mm-site. One of the goals of MITO is the multifrequency observation of nearby rich clusters of galaxies for measuring the Sunyaev-Zel’dovich effect. Combined S-Z and X-ray measurements yield the Hubble constant and other cosmological information. A dedicated instrument has been designed to minimize spurious contaminations on the signals. The telescope is a 2.6 m Cassegrain with a wobbling subreflector and a 4-band single pixel photometer installed at the focal plane. The bolometric detectors are cooled down to 300 mK by a double stage He3-He4 fridge.

Item Type: Article
Additional Information: Paper presented at the Chacaltaya Meeting on Cosmic Ray Physics, La Paz, Bolivia, July 23-27, 2000.
Uncontrolled Keywords: Observatories and site testing ; Radio, microwave (> 1 mm) ; Cosmology ; Conference proceedings
Subjects: 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia > 551.5 Meteorologia (Classificare qui l'atmosfera) (Classificare la previsione e le previsioni di specifici fenomeni meteorologici in 551.64; classificare la Micrometeorologia in 551.66) > 551.52 Termodinamica, interazioni atmosferiche con la superficie terrestre, temperature, radiazioni > 551.527 Radiazioni (per fenomeni ottici, vedi 551.565) > 551.5276 Radiazioni cosmiche (Include il rumore cosmico) (Classificare qui i raggi cosmici)
Depositing User: Marina Spanti
Date Deposited: 11 Mar 2020 11:16
Last Modified: 11 Mar 2020 11:16

Actions (login required)

View Item View Item