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http://hdl.handle.net/20.500.12386/32537
Title: | HERA Phase I Limits on the Cosmic 21 cm Signal: Constraints on Astrophysics and Cosmology during the Epoch of Reionization | Authors: | Abdurashidova, Zara Aguirre, James E. Alexander, Paul Ali, Zaki S. Balfour, Yanga Barkana, Rennan Beardsley, Adam P. BERNARDI, GIANNI Billings, Tashalee S. Bowman, Judd D. Bradley, Richard F. BULL, PHILIP Burba, Jacob Carey, Steve Carilli, Chris L. Cheng, Carina DeBoer, David R. Dexter, Matt de Lera Acedo, Eloy Dillon, Joshua S. Ely, John Ewall-Wice, Aaron Fagnoni, Nicolas Fialkov, Anastasia Fritz, Randall Furlanetto, Steven R. Gale-Sides, Kingsley Glendenning, Brian Gorthi, Deepthi Greig, Bradley Grobbelaar, Jasper Halday, Ziyaad Hazelton, Bryna J. Heimersheim, Stefan Hewitt, Jacqueline N. Hickish, Jack Jacobs, Daniel C. Julius, Austin Kern, Nicholas S. Kerrigan, Joshua Kittiwisit, Piyanat Kohn, Saul A. Kolopanis, Matthew Lanman, Adam La Plante, Paul Lekalake, Telalo Lewis, David Liu, Adrian Ma, Yin-Zhe MacMahon, David Malan, Lourence Malgas, Cresshim Maree, Matthys Martinot, Zachary E. Matsetela, Eunice Mesinger, Andrei Mirocha, Jordan Molewa, Mathakane Morales, Miguel F. Mosiane, Tshegofalang Muñoz, Julian B. Murray, Steven G. Neben, Abraham R. Nikolic, Bojan Nunhokee, Chuneeta D. Parsons, Aaron R. Patra, Nipanjana Pieterse, Samantha Pober, Jonathan C. Qin, Yuxiang Razavi-Ghods, Nima Reis, Itamar Ringuette, Jon Robnett, James Rosie, Kathryn Santos, Mario G. Sikder, Sudipta Sims, Peter Smith, Craig Syce, Angelo Thyagarajan, Nithyanandan Williams, Peter K. G. Zheng, Haoxuan |
Issue Date: | 2022 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 924 | Issue: | 2 | First Page: | 51 | Abstract: | Recently, the Hydrogen Epoch of Reionization Array (HERA) has produced the experiment's first upper limits on the power spectrum of 21 cm fluctuations at z ~ 8 and 10. Here, we use several independent theoretical models to infer constraints on the intergalactic medium (IGM) and galaxies during the epoch of reionization from these limits. We find that the IGM must have been heated above the adiabatic-cooling threshold by z ~ 8, independent of uncertainties about IGM ionization and the radio background. Combining HERA limits with complementary observations constrains the spin temperature of the z ~ 8 neutral IGM to 27 K $\langle {\overline{T}}_{S}\rangle $ 630 K (2.3 K $\langle {\overline{T}}_{S}\rangle $ 640 K) at 68% (95%) confidence. They therefore also place a lower bound on X-ray heating, a previously unconstrained aspects of early galaxies. For example, if the cosmic microwave background dominates the z ~ 8 radio background, the new HERA limits imply that the first galaxies produced X-rays more efficiently than local ones. The z ~ 10 limits require even earlier heating if dark-matter interactions cool the hydrogen gas. If an extra radio background is produced by galaxies, we rule out (at 95% confidence) the combination of high radio and low X-ray luminosities of L <SUB> r,ν </SUB>/SFR > 4 × 10<SUP>24</SUP> W Hz<SUP>-1</SUP> ${M}_{\odot }^{-1}$ yr and L <SUB> X </SUB>/SFR < 7.6 × 10<SUP>39</SUP> erg s<SUP>-1</SUP> ${M}_{\odot }^{-1}$ yr. The new HERA upper limits neither support nor disfavor a cosmological interpretation of the recent Experiment to Detect the Global EOR Signature (EDGES) measurement. The framework described here provides a foundation for the interpretation of future HERA results. | URI: | http://hdl.handle.net/20.500.12386/32537 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ac2ffc https://api.elsevier.com/content/abstract/scopus_id/85123540464 |
ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ac2ffc | Bibcode ADS: | 2022ApJ...924...51A | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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HERA_I_22.pdf | Pdf editoriale | 8.38 MB | Adobe PDF | View/Open |
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