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arXiv:astro-ph/0403137 (astro-ph)
[Submitted on 5 Mar 2004 (v1), last revised 27 Jan 2005 (this version, v2)]

Title:CMB Observations with a Compact Heterogeneous 150 GHz Interferometer in Chile

Authors:J. W. Fowler, W. B. Doriese, T. A. Marriage, H. T. Tran, A. M. Aboobaker, C. Dumont, M. Halpern, Z. D. Kermish, Y.-S. Loh, L. A. Page, S. T. Staggs, D. H. Wesley
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Abstract: We report on the design, first observing season, and analysis of data from a new prototype millimeter-wave interferometer, MINT. MINT consists of four 145 GHz SIS mixers operating in double-sideband mode in a compact heterogeneous configuration. The signal band is subdivided by a monolithic channelizer, after which the correlations between antennas are performed digitally. The typical receiver sensitivity in a 2 GHz band is 1.4 mK sqrt(s). MINT observed the cosmic microwave background (CMB) from the Chilean Altiplano. The site has a median nighttime atmospheric temperature of 9 K at zenith (exclusive of the CMB). Observations of Mars, Jupiter, and a telescope-mounted calibration source establish the system's phase and magnitude stability. MINT is the first CMB-dedicated interferometer to operate above 50 GHz. The same type of system can be used to probe the Sunyaev-Zel'dovich effect in galaxy clusters near the SZ null at 217 GHz. We present an analysis of sideband-separated, digitally sampled data recorded by the array. Based on 215 hours of data taken in late 2001, we set an upper limit on the CMB anisotropy in a band of width Delta ell=700 around ell=1540 of delta T < 105 microK (95% conf). Increased sensitivity can be achieved with more integration time, greater bandwidth, and more elements.
Comments: 12 pages, 4 figures. v2: Final ApJS version; rewritten analysis section made more clear
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0403137
  (or arXiv:astro-ph/0403137v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0403137
Journal reference: Astrophys. J. Suppl. 156 (2005) 1-11
Related DOI: https://doi.org/10.1086/426393

Submission history

From: Joseph Fowler [view email]
[v1] Fri, 5 Mar 2004 05:17:59 UTC (84 KB)
[v2] Thu, 27 Jan 2005 15:04:52 UTC (86 KB)
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