With the TRIS experiment we have performed absolute measurements of the sky brightness in a sky circle at $\delta = +42^{\circ}$ at the frequencies $\nu =$ 0.60, 0.82 and 2.5 GHz. In this paper we discuss the techniques used to separate the different contributions to the sky emission and give an evaluation of the absolute temperature of the Cosmic Microwave Background. For the black-body temperature of the CMB we get: $T_{cmb}^{th}=(2.837 \pm 0.129 \pm 0.066)K$ at $\nu=0.60$ GHz; $T_{cmb}^{th}=(2.803 \pm 0.051 ^{+0.430} _{-0.300})K$ at $\nu=0.82$ GHz; $T_{cmb}^{th}=(2.516 \pm 0.139 \pm 0.284)K$ at $\nu=2.5$ GHz. The first error bar is statistic (1$\sigma$) while the second one is systematic. These results represent a significant improvement with respect to the previous measurements. We have also set new limits to the free-free distortions, $ -6.3 \times 10^{-6} < Y_{ff} < 12.6 \times 10^{-6}$, and slightly improved the Bose-Einstein upper limit, $|\mu| < 6 \times 10^{-5}$, both at 95% confidence level.

Gervasi, M., Zannoni, M., Tartari, A., Boella, G., Sironi, G. (2008). TRIS II: search for CMB spectral distortions at 0.60, 0.82 and 2.5 GHz. THE ASTROPHYSICAL JOURNAL, 688(1), 24-31 [10.1086/592134].

TRIS II: search for CMB spectral distortions at 0.60, 0.82 and 2.5 GHz

GERVASI, MASSIMO;ZANNONI, MARIO;BOELLA, GIULIANO FILIPPO;SIRONI, GIORGIO
2008

Abstract

With the TRIS experiment we have performed absolute measurements of the sky brightness in a sky circle at $\delta = +42^{\circ}$ at the frequencies $\nu =$ 0.60, 0.82 and 2.5 GHz. In this paper we discuss the techniques used to separate the different contributions to the sky emission and give an evaluation of the absolute temperature of the Cosmic Microwave Background. For the black-body temperature of the CMB we get: $T_{cmb}^{th}=(2.837 \pm 0.129 \pm 0.066)K$ at $\nu=0.60$ GHz; $T_{cmb}^{th}=(2.803 \pm 0.051 ^{+0.430} _{-0.300})K$ at $\nu=0.82$ GHz; $T_{cmb}^{th}=(2.516 \pm 0.139 \pm 0.284)K$ at $\nu=2.5$ GHz. The first error bar is statistic (1$\sigma$) while the second one is systematic. These results represent a significant improvement with respect to the previous measurements. We have also set new limits to the free-free distortions, $ -6.3 \times 10^{-6} < Y_{ff} < 12.6 \times 10^{-6}$, and slightly improved the Bose-Einstein upper limit, $|\mu| < 6 \times 10^{-5}$, both at 95% confidence level.
Articolo in rivista - Articolo scientifico
Astrophysics
English
2008
688
1
24
31
open
Gervasi, M., Zannoni, M., Tartari, A., Boella, G., Sironi, G. (2008). TRIS II: search for CMB spectral distortions at 0.60, 0.82 and 2.5 GHz. THE ASTROPHYSICAL JOURNAL, 688(1), 24-31 [10.1086/592134].
File in questo prodotto:
File Dimensione Formato  
TRIS. II. Search for CMB Spectral Distortions at 0.60, 0.82, and 2.5 GHz.pdf

accesso aperto

Dimensione 745.96 kB
Formato Adobe PDF
745.96 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/3792
Citazioni
  • Scopus 42
  • ???jsp.display-item.citation.isi??? 32
Social impact