2022ApJ...925..221A

Query : 2022ApJ...925..221A

2022ApJ...925..221A - Astrophys. J., 925, 221-221 (2022/February-1)

First Results from HERA Phase I: Upper Limits on the Epoch of Reionization 21 cm Power Spectrum.

ABDURASHIDOVA Z., AGUIRRE J.E., ALEXANDER P., ALI Z.S., BALFOUR Y., BEARDSLEY A.P., BERNARDI G., BILLINGS T.S., BOWMAN J.D., BRADLEY R.F., BULL P., BURBA J., CAREY S., CARILLI C.L., CHENG C., DEBOER D.R., DEXTER M., DE LERA ACEDO E., DIBBLEE-BARKMAN T., DILLON J.S., 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., KERN N.S., KERRIGAN J., KITTIWISIT P., KOHN S.A., KOLOPANIS M., LANMAN A., LA PLANTE P., LEKALAKE T., LEWIS D., 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., PARSONS A.R., PATRA N., PASCUA R., PIETERSE S., POBER J.C., RAZAVI-GHODS N., RINGUETTE J., ROBNETT J., ROSIE K., SIMS P., SINGH S., SMITH C., SYCE A., THYAGARAJAN N., WILLIAMS P.K.G., ZHENG H. (The HERA Collaboration)

Abstract (from CDS):

We report upper limits on the Epoch of Reionization 21 cm power spectrum at redshifts 7.9 and 10.4 with 18 nights of data (∼36 hr of integration) from Phase I of the Hydrogen Epoch of Reionization Array (HERA). The Phase I data show evidence for systematics that can be largely suppressed with systematic models down to a dynamic range of ∼109 with respect to the peak foreground power. This yields a 95% confidence upper limit on the 21 cm power spectrum of {Δ}_{21}^{2}(30.76)^{2} mK^{2} at k = 0.192 h Mpc–1 at z = 7.9, and also {Δ}_{21}^{2}(95.74)^{2} mK^{2} at k = 0.256 h Mpc–1 at z = 10.4. At z = 7.9, these limits are the most sensitive to date by over an order of magnitude. While we find evidence for residual systematics at low line-of-sight Fourier k|| modes, at high k|| modes we find our data to be largely consistent with thermal noise, an indicator that the system could benefit from deeper integrations. The observed systematics could be due to radio frequency interference, cable subreflections, or residual instrumental cross-coupling, and warrant further study. This analysis emphasizes algorithms that have minimal inherent signal loss, although we do perform a careful accounting in a companion paper of the small forms of loss or bias associated with the pipeline. Overall, these results are a promising first step in the development of a tuned, instrument-specific analysis pipeline for HERA, particularly as Phase II construction is completed en route to reaching the full sensitivity of the experiment.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

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

Simbad objects: 4

goto Full paper

goto View the references in ADS

Number of rows : 4
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 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
2 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
3 PSR B0740-28 Psr 07 42 49.0730 -28 22 43.510           ~ 445 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0

To bookmark this query, right click on this link: simbad:objects in 2022ApJ...925..221A and select 'bookmark this link' or equivalent in the popup menu