2020ApJ...890..122K

Query : 2020ApJ...890..122K

2020ApJ...890..122K - Astrophys. J., 890, 122-122 (2020/February-3)

Absolute calibration strategies for the Hydrogen Epoch of Reionization Array and their impact on the 21 cm power spectrum.

KERN N.S., DILLON J.S., PARSONS A.R., CARILLI C.L., BERNARDI G., ABDURASHIDOVA Z., AGUIRRE J.E., ALEXANDER P., ALI Z.S., BALFOUR Y., BEARDSLEY A.P., BILLINGS T.S., BOWMAN J.D., BRADLEY R.F., BULL P., BURBA J., CAREY S., CHENG C., DEBOER D.R., DEXTER M., DE LERA ACEDO E., ELY J., EWALL-WICE A., FAGNONI N., FRITZ R., FURLANETTO S.R., GALE-SIDES K., GLENDENNING B., GORTHI D., GREIG B., GROBBELAAR J., HALDAY Z., HAZELTON B.J., HEWITT J.N., HICKISH J., JACOBS D.C., JULIUS A., KERRIGAN J., KITTIWISIT P., KOHN S.A., KOLOPANIS M., LANMAN A., LA PLANTE P., LEKALAKE T., LIU A., MacMAHON D., MALAN L., MALGAS C., MAREE M., MARTINOT Z.E., MATSETELA E., MESINGER A., MOLEWA M., MORALES M.F., MOSIANE T., MURRAY S.G., NEBEN A.R., NIKOLIC B., NUNHOKEE C.D., PATRA N., PIETERSE S., POBER J.C., RAZAVI-GHODS N., RINGUETTE J., ROBNETT J., ROSIE K., SIMS P., SMITH C., SYCE A., THYAGARAJAN N., WILLIAMS P.K.G. and ZHENG H.

Abstract (from CDS):

We discuss absolute calibration strategies for Phase I of the Hydrogen Epoch of Reionization Array (HERA), which aims to measure the cosmological 21 cm signal from the Epoch of Reionization. HERA is a drift-scan array with a 10° wide field of view, meaning bright, well-characterized point-source transits are scarce. This, combined with HERA's redundant sampling of the uv plane and the modest angular resolution of the Phase I instrument, make traditional sky-based and self-calibration techniques difficult to implement with high dynamic range. Nonetheless, in this work, we demonstrate calibration for HERA using point-source catalogs and electromagnetic simulations of its primary beam. We show that unmodeled diffuse flux and instrumental contaminants can corrupt the gain solutions and present a gain-smoothing approach for mitigating their impact on the 21 cm power spectrum. We also demonstrate a hybrid sky and redundant calibration scheme and compare it to pure sky-based calibration, showing only a marginal improvement to the gain solutions at intermediate delay scales. Our work suggests that the HERA Phase I system can be well calibrated for a foreground avoidance power spectrum estimator by applying direction-independent gains with a small set of degrees of freedom across the frequency and time axes.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Cosmology - Reionization - Astronomy data analysis

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LEDA 2822170 Sy2 00 24 30.1497156456 -29 28 54.448830876     20.0     ~ 67 1
2 QSO J0200-3053 QSO 02 00 12.1757038704 -30 53 26.673024840   19.0 19.6     ~ 62 1
3 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
4 PKS 0453-30 rG 04 55 14.2787262459 -30 06 48.748690569   18.5       ~ 35 1
5 ESO 252-18A Sy1 05 19 49.7229323856 -45 46 43.852662732   15.73 15.77 14.85   ~ 714 0

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