Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Barry, Nichole"'
Autor:
Nunhokee, Chuneeta D., Null, Dev, Trott, Cathryn M., Jordan, Christopher H., Line, Jack B., Wayth, Randall, Barry, Nichole
Observations of the 21 cm signal face significant challenges due to bright astrophysical foregrounds that are several orders of magnitude higher than the brightness of the hydrogen line, along with various systematics. Successful 21 cm experiments re
Externí odkaz:
http://arxiv.org/abs/2409.03232
Autor:
Wilensky, Michael J., Morales, Miguel F., Hazelton, Bryna J., Star, Pyxie L., Barry, Nichole, Byrne, Ruby, Jordan, C. H., Jacobs, Daniel C., Pober, Jonathan C., Trott, C. M.
Publikováno v:
The Astrophysical Journal, 2023, Volume 957, Number 2, p. 78
We present deep upper limits from the 2014 Murchison Widefield Array (MWA) Phase I observing season, with a particular emphasis on identifying the spectral fingerprints of extremely faint radio frequency interference (RFI) contamination in the 21~cm
Externí odkaz:
http://arxiv.org/abs/2310.03851
Autor:
Trott, Cathryn M., Mondal, Rajesh, Mellema, Garrelt, Murray, Steven G., Greig, Bradley, Line, Jack L. B., Barry, Nichole, Morales, Miguel F.
Publikováno v:
A&A 666, A106 (2022)
The Multi-frequency Angular Power Spectrum (MAPS) is an alternative to spherically-averaged power spectra, and computes local fluctuations in the angular power spectrum without need for line-of-sight spectral transform. To test different approaches t
Externí odkaz:
http://arxiv.org/abs/2208.06082
Autor:
Barry, Nichole, Chokshi, Aman
Reconstruction of the sky brightness measured by radio interferometers is typically achieved through gridding techniques, or histograms in spatial Fourier space. For Epoch of Reionisation (EoR) 21 cm power spectrum measurements, extreme levels of gri
Externí odkaz:
http://arxiv.org/abs/2203.01130
Publikováno v:
Publications of the Astronomical Society of Australia, Volume 39, 2022, e023
We describe a new polarized imaging pipeline implemented in the FHD software package. The pipeline is based on the optimal mapmaking imaging approach and performs horizon-to-horizon image reconstruction in all polarization modes. We discuss the forma
Externí odkaz:
http://arxiv.org/abs/2201.10653
The Square Kilometre Array (SKA) is a planned radio interferometer of unprecedented scale that will revolutionize low-frequency radio astronomy when completed. In particular, one of its core science drivers is the systematic mapping of the Cosmic Daw
Externí odkaz:
http://arxiv.org/abs/2110.06173
Autor:
Byrne, Ruby, Morales, Miguel F., Hazelton, Bryna, Sullivan, Ian, Barry, Nichole, Lynch, Christene, Line, Jack L. B., Jacobs, Daniel C.
We present a broadband map of polarized diffuse emission at 167-198 MHz developed from data from the Murchison Widefield Array (MWA). The map is designed to improve visibility simulation and precision calibration for 21 cm Epoch of Reionization (EoR)
Externí odkaz:
http://arxiv.org/abs/2107.11487
Autor:
Zhang, Zheng, Pober, Jonathan C., Li, Wenyang, Hazelton, Bryna J., Morales, Miguel F., Trott, Cathryn M., Jordan, Christopher H., Joseph, Ronniy C., Beardsley, Adam, Barry, Nichole, Byrne, Ruby, Tingay, Steven J., Chokshi, Aman, Hasegawa, Kenji, Jacobs, Daniel C., Lanman, Adam, Line, Jack L. B., Lynch, Christene, McKinley, Benjamin, Mitchell, Daniel A., Murray, Steven, Pindor, Bart, Rahimi, Mahsa, Takahashi, Keitaro, Wayth, Randall B., Webster, Rachel L., Wilensky, Michael, Yoshiura, Shintaro, Zheng, Qian
Precise instrumental calibration is of crucial importance to 21-cm cosmology experiments. The Murchison Widefield Array's (MWA) Phase II compact configuration offers us opportunities for both redundant calibration and sky-based calibration algorithms
Externí odkaz:
http://arxiv.org/abs/2009.09269
Autor:
Greig, Bradley, Trott, Cathryn M., Barry, Nichole, Mutch, Simon J., Pindor, Bart, Webster, Rachel L., Wyithe, J. Stuart B.
We use the latest multi-redshift ($z=6.5-8.7$) upper limits on the 21-cm signal from the Murchison Widefield Array (MWA) to explore astrophysical models which are inconsistent with the data. These upper limits are achieved using 298 h of carefully ex
Externí odkaz:
http://arxiv.org/abs/2008.02639
We quantify the effect of radio frequency interference (RFI) on measurements of the 21-cm power spectrum during the Epoch of Reionization (EoR). Specifically, we investigate how the frequency structure of RFI source emission generates contamination i
Externí odkaz:
http://arxiv.org/abs/2004.07819