On-sky Performance of the CLASS Q-band Telescope

被引：19

作者：

Appel, John W. ^{[1
]}

Xu, Zhilei ^{[1
,2
]}

Padilla, Ivan L. ^{[1
]}

Harrington, Kathleen ^{[1
,3
]}

Pradenas Marquez, Bastian ^{[4
]}

Ali, Aamir ^{[1
,5
]}

Bennett, Charles L. ^{[1
]}

Brewer, Michael K. ^{[1
]}

Bustos, Ricardo ^{[6
]}

Chan, Manwei ^{[1
]}

Chuss, David T. ^{[7
]}

Cleary, Joseph ^{[1
]}

Couto, Jullianna ^{[1
]}

Dahal, Sumit ^{[1
]}

Denis, Kevin ^{[8
]}

Dunner, Rolando ^{[9
,10
]}

Eimer, Joseph R. ^{[1
]}

Essinger-Hileman, Thomas ^{[8
]}

Fluxa, Pedro ^{[9
,10
]}

Gothe, Dominik ^{[1
]}

Hilton, Gene C. ^{[11
]}

Hubmayr, Johannes ^{[11
]}

Iuliano, Jeffrey ^{[1
]}

Karakla, John ^{[1
]}

Marriage, Tobias A. ^{[1
]}

Miller, Nathan J. ^{[1
,8
]}

Nunez, Carolina ^{[1
]}

Parker, Lucas ^{[1
,12
]}

Petroff, Matthew ^{[1
]}

Reintsema, Carl D. ^{[1
]}

Rostem, Karwan ^{[8
]}

Stevens, Robert W. ^{[11
]}

Valle, Deniz Augusto Nunes ^{[1
]}

Wang, Bingjie ^{[1
]}

Watts, Duncan J. ^{[1
]}

Wollack, Edward J. ^{[8
]}

Zeng, Lingzhen ^{[13
]}

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, 3701 San Martin Dr, Baltimore, MD 21218 USA

[2] Univ Penn, Dept Phys & Astron, 209 South 33rd St, Philadelphia, PA 19104 USA

[3] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[4] Univ Chile, Dept Fis, FCFM, Blanco Encalada 2008, Santiago, Chile

[5] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[6] Univ Catolica Santisima Concepcion, Fac Ingn, Alonso de Ribera 2850, Concepcion, Chile

[7] Villanova Univ, Dept Phys, 800 Lancaster Ave, Villanova, PA 19085 USA

[8] Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA

[9] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile

[10] Pontificia Univ Catolica Chile, Fac Fis, Ctr Astroingn, Av Vicuna Mackenna 4860, Santiago 7820436, Chile

[11] NIST, Quantum Sensors Grp, 325 Broadway, Boulder, CO 80305 USA

[12] Los Alamos Natl Lab, Space & Remote Sensing, MS D436, Los Alamos, NM 87544 USA

[13] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 876卷 / 02期

基金：

美国国家科学基金会;

关键词：

cosmic background radiation; cosmology: observations; inflation; instrumentation: detectors; ISM: supernova remnants; Moon; INFLATIONARY UNIVERSE SCENARIO; PROBE WMAP OBSERVATIONS; PHASE-TRANSITION; MICROWAVE; POLARIZATION; MILLIMETER; SUBMILLIMETER; TEMPERATURE; NOISE; BOLOMETERS;

D O I：

10.3847/1538-4357/ab1652

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Cosmology Large Angular Scale Surveyor (CLASS) is mapping the polarization of the cosmic microwave background (CMB) at large angular scales (2 < l less than or similar to 200) in search of a primordial gravitational wave B-mode signal down to a tensor-to-scalar ratio of r approximate to 0.01. The same data set will provide a near sample-variance-limited measurement of the optical depth to reionization. Between 2016 June and 2018 March, CLASS completed the largest ground-based Q-band CMB survey to date, covering over 31,000. square-degrees (75% of the sky), with an instantaneous array noise-equivalent temperature sensitivity of 32 mu K-cmb root s. We demonstrate that the detector optical loading (1.6 pW) and noise-equivalent power (19 aW root s) match the expected noise model dominated by photon bunching noise. We derive a 13.1 +/- 0.3 K pW(-1) calibration to antenna temperature based on Moon observations, which translates to an optical efficiency of 0.48 +/- 0.02 and a 27 K system noise temperature. Finally, we report a Tau A flux density of 308 +/- 11 Jy at 38.4 +/- 0.2 GHz, consistent with the Wilkinson Microwave Anisotropy Probe Tau A time-dependent spectral flux density model.

引用

页数：9

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