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Hansen, Lene; Jørgensen, H.E.; Nørgaard-Nielsen, Hans Ulrik; Pedersen, Kenneth; Goudfrooij, P.; Linden-Vornle, M.J.D. |
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ISO far-infrared observations of rich galaxy clusters III. Abell 2029, Abell 2052, Abell 2142 |
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2000 |
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Astron. Astrophys. |
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A&A |
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362 |
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1 |
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133-137 |
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A sample of five rich galaxy clusters has been mapped by ISO at 60 μm, 100 μm, 135 μm, and 200 μm using the PHT-C camera. In previous papers Abell 2670 and Sersic 159-03 were discussed. Here we present the results for Abell 2029, Abell 2052, and Abell 2142. The conclusion of the survey is that the relatively small fields (approximate to 60 square are minutes) are structured with filaments or superpositions of point sources. In some cases point sources (approximate to 0.1 Jy) can be identified with cluster galaxies. An attempt to demonstrate infrared emission from dust in the cooling flows (due to star formation) was inconclusive. |
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456 |
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Gerecht, E.; Musante, C.F.; Zhuang, Y.; Ji, M.; Yngvesson, K.S.; Goyette, T.; Waldman, J. |
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Title |
NbN hot electron bolometric mixer with intrinsic receiver noise temperature of less than five times the quantum noise limit |
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Conference Article |
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2000 |
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Proc. IMS |
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2 |
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1007-1010 |
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HEB mixer |
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In recent years, improvements in device development and quasi-optical coupling techniques utilizing planar antennas have led to a significant achievement in low noise receivers for the edges of the submillimeter frequency regime. Hot electron bolometric (HEB) receivers made of thin superconducting films such as NbN have produced a viable option for instruments designed to measure the molecular spectra for astronomical applications as well as in remote sensing of the atmosphere in the THz regime. This paper describes an NbN HEB mixer with intrinsic DSB receiver noise temperature of at most five times the quantum noise limit at frequencies as high as 2.24 THz |
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Wright, E. L.; Reese, E. D. |
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Detection of the cosmic infrared background at 2.2 and 3.5 microns using DIRBE observations |
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2000 |
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Astrophys. J. |
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545 |
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1 |
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43-55 |
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IR applications |
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0004-637X |
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486 |
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Saslaw, William C. |
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The distribution of the galaxies. Gravitational clustering in cosmology |
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2000 |
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Press syndicate of the University of Cambridge |
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astronomy |
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495 |
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Kawamura, J.; Blundell, R.; Tong, C.-Y. E.; Papa, D. C.; Hunter, T. R.; Paine, S. N.; Patt, F.; Gol'tsman, G.; Cherednichenko, S.; Voronov, B.; Gershenzon, E. |
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Title |
Superconductive hot-electron-bolometer mixer receiver for 800-GHz operation |
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Journal Article |
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2000 |
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IEEE Trans. Microw. Theory Techn. |
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IEEE Trans. Microw. Theory Techn. |
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48 |
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4 |
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683-689 |
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NbN HEB mixers, LO power, local oscillator power, saturation, linearity, dynamic range |
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In this paper, we describe a superconductive hot-electron-bolometer mixer receiver designed to operate in the partially transmissive 350-μm atmospheric window. The receiver employs an NbN thin-film microbridge as the mixer element, in which the main cooling mechanism of the hot electrons is through electron-phonon interaction. At a local-oscillator frequency of 808 GHz, the measured double-sideband receiver noise temperature is TRX=970 K, across a 1-GHz intermediate-frequency bandwidth centered at 1.8 GHz. We have measured the linearity of the receiver and the amount of local-oscillator power incident on the mixer for optimal operation, which is PLO≈1 μW. This receiver was used in making observations as a facility instrument at the Heinrich Hertz Telescope, Mt. Graham, AZ, during the 1998-1999 winter observing season. |
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0018-9480 |
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RPLAB @ lobanovyury @ |
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573 |
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