The page summarizes the results of Phase 1 operation of HERA with an index of the papers supporting the result, data files containing the power spectrum limits, and example code for reading them.
- HERA Collaboration et al 2021a (H21a) – Summary paper describing data and methods. The paper has been accepted to ApJ and is currently in press.
- HERA Collaboration et al 2021b (H21b) – Companion paper evaluating theory implications. This paper has been submitted to ApJ
- Supporting papers
- Aguirre et al 2021(arxiv) – Pipeline validation using independent simulators
- Kern et al. 2020b – Absolute Calibration
- Dillon et al 2020 – Redundant calibration
- Tan et al 2020 – Error bar estimation used in H21a
- The Phase 1 75Ohm RF system has a known reflection systematic.
- Kern et al 2019 – A method for filtering systematic
- Kern et al 2020a – Application to HERA data
- Dillon et al 2019 – Memo detailing description of the processing used in this release (eg flagging, calibration, binning)
The Instrument
HERA has been observing during construction. In 2017-2018 the first phase of construction used the feeds, 75 Ohm cables, and correlator from the PAPER experiment. The first stage amplifiers, however, were replaced as a test preparatory to the cosmic dawn upgrade currently under way. This system is described in more detail by H21a and Kern et al 2019.
See also:
- HERA memo series describing work in progress
- Photo Stream documenting build
- List of HERA papers
The data
The power spectra are provided in HDF5 format, using the UVPSpec object in the hera_pspec library.
- python jupyter notebook demonstrating how to read the data.
- data files and executable notebook.
Summary Figures
A comparison of recent 21cm power spectra with redshift indicated by color. (made using eor_limits)
A comparison of recent power spectrum organized by redshift.
