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51. Impact of instrument and data characteristics in the interferometric reconstruction of the 21 cm power spectrum

Author

Gorce, Adélie, primary, Ganjam, Samskruthi, additional, Liu, Adrian, additional, Murray, Steven G, additional, Abdurashidova, Zara, additional, Adams, Tyrone, additional, Aguirre, James E, additional, Alexander, Paul, additional, Ali, Zaki S, additional, Baartman, Rushelle, additional, Balfour, Yanga, additional, Beardsley, Adam P, additional, Bernardi, Gianni, additional, Billings, Tashalee S, additional, Bowman, Judd D, additional, Bradley, Richard F, additional, Bull, Philip, additional, Burba, Jacob, additional, Carey, Steven, additional, Carilli, Chris L, additional, Cheng, Carina, additional, DeBoer, David R, additional, Acedo, Eloy de Lera, additional, Dexter, Matt, additional, Dillon, Joshua S, additional, Eksteen, Nico, additional, Ely, John, additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steven R, additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J, additional, Hewitt, Jacqueline N, additional, Hickish, Jack, additional, Jacobs, Daniel C, additional, Julius, Austin, additional, Kariseb, MacCalvin, additional, Kern, Nicholas S, additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A, additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, Plante, Paul La, additional, Loots, Anita, additional, MacMahon, David Harold Edward, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Malgas, Keith, additional, Marero, Bradley, additional, Martinot, Zachary E, additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Morales, Miguel F, additional, Mosiane, Tshegofalang, additional, Neben, Abraham R, additional, Nikolic, Bojan, additional, Nuwegeld, Hans, additional, Parsons, Aaron R, additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C, additional, Razavi-Ghods, Nima, additional, Robnett, James, additional, Rosie, Kathryn, additional, Sims, Peter, additional, Swarts, Hilton, additional, Thyagarajan, Nithyanandan, additional, van Wyngaarden, Pieter, additional, Williams, Peter K G, additional, and Zheng, Haoxuan, additional

Published
2023
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52. Bayesian jackknife tests with a small number of subsets: application to HERA 21 cm power spectrum upper limits

Author

Wilensky, Michael J, primary, Kennedy, Fraser, additional, Bull, Philip, additional, Dillon, Joshua S, additional, Abdurashidova, Zara, additional, Adams, Tyrone, additional, Aguirre, James E, additional, Alexander, Paul, additional, Ali, Zaki S, additional, Baartman, Rushelle, additional, Balfour, Yanga, additional, Beardsley, Adam P, additional, Bernardi, Gianni, additional, Billings, Tashalee S, additional, Bowman, Judd D, additional, Bradley, Richard F, additional, Burba, Jacob, additional, Carey, Steven, additional, Carilli, Chris L, additional, Cheng, Carina, additional, DeBoer, David R, additional, de Lera Acedo, Eloy, additional, Dexter, Matt, additional, Eksteen, Nico, additional, Ely, John, additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steven R, additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J, additional, Hewitt, Jacqueline N, additional, Hickish, Jack, additional, Jacobs, Daniel C, additional, Julius, Austin, additional, Kariseb, MacCalvin, additional, Kern, Nicholas S, additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A, additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, La Plante, Paul, additional, Liu, Adrian, additional, Loots, Anita, additional, MacMahon, David Harold Edward, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Malgas, Keith, additional, Marero, Bradley, additional, Martinot, Zachary E, additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Morales, Miguel F, additional, Mosiane, Tshegofalang, additional, Murray, Steven G, additional, Neben, Abraham R, additional, Nikolic, Bojan, additional, Nuwegeld, Hans, additional, Parsons, Aaron R, additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Razavi-Ghods, Nima, additional, Robnett, James, additional, Rosie, Kathryn, additional, Sims, Peter, additional, Swarts, Hilton, additional, Thyagarajan, Nithyanandan, additional, van Wyngaarden, Pieter, additional, Williams, Peter K G, additional, and Zheng, Haoxuan, additional

Published
2022
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53. Direct Optimal Mapping for 21 cm Cosmology: A Demonstration with the Hydrogen Epoch of Reionization Array

Author

Xu, Zhilei, primary, Hewitt, Jacqueline N., additional, Chen, Kai-Feng, additional, Kim, Honggeun, additional, Dillon, Joshua S., additional, Kern, Nicholas S., additional, Morales, Miguel F., additional, Hazelton, Bryna J., additional, Byrne, Ruby, additional, Fagnoni, Nicolas, additional, Acedo, Eloy de Lera, additional, Abdurashidova, Zara, additional, Adams, Tyrone, additional, Aguirre, James E., additional, Alexander, Paul, additional, Ali, Zaki S., additional, Baartman, Rushelle, additional, Balfour, Yanga, additional, Beardsley, Adam P., additional, Bernardi, Gianni, additional, Billings, Tashalee S., additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Bull, Philip, additional, Burba, Jacob, additional, Carey, Steven, additional, Carilli, Chris L., additional, Cheng, Carina, additional, DeBoer, David R., additional, Dexter, Matt, additional, Eksteen, Nico, additional, Ely, John, additional, Ewall-Wice, Aaron, additional, Fritz, Randall, additional, Furlanetto, Steven R., additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hickish, Jack, additional, Jacobs, Daniel C., additional, Julius, Austin, additional, Kariseb, MacCalvin, additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A., additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, Plante, Paul La, additional, Liu, Adrian, additional, Loots, Anita, additional, Ma, Yin-Zhe, additional, Edward MacMahon, David Harold, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Malgas, Keith, additional, Marero, Bradley, additional, Martinot, Zachary E., additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Mosiane, Tshegofalang, additional, Murray, Steven G., additional, Neben, Abraham R., additional, Nikolic, Bojan, additional, Nuwegeld, Hans, additional, Parsons, Aaron R., additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C., additional, Razavi-Ghods, Nima, additional, Robnett, James, additional, Rosie, Kathryn, additional, Sims, Peter, additional, Smith, Craig, additional, Swarts, Hilton, additional, Thyagarajan, Nithyanandan, additional, Wyngaarden, Pieter Van Van, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2022
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54. Methods of Error Estimation for Delay Power Spectra in 21 cm Cosmology

Author

Massachusetts Institute of Technology. Department of Physics, Tan, Jianrong, Liu, Adrian, Kern, Nicholas S., Abdurashidova, Zara, Aguirre, James E., Alexander, Paul, Ali, Zaki S., Balfour, Yanga, Beardsley, Adam P., Bernardi, Gianni, Billings, Tashalee S., Bowman, Judd D., Bradley, Richard F., Bull, Philip, Burba, Jacob, Carey, Steven, Carilli, Christopher L., Cheng, Carina, DeBoer, David R., Dexter, Matt, de Lera Acedo, Eloy, Dillon, Joshua S., Ely, John, Ewall-Wice, Aaron, Fagnoni, Nicolas, Fritz, Randall, Furlanetto, Steve R., Gale-Sides, Kingsley, Glendenning, Brian, Gorthi, Deepthi, Greig, Bradley, Grobbelaar, Jasper, Halday, Ziyaad, Hazelton, Bryna J., Hewitt, Jacqueline N., Hickish, Jack, Jacobs, Daniel C., Julius, Austin, Kerrigan, Joshua, Kittiwisit, Piyanat, Kohn, Saul A., Kolopanis, Matthew, Lanman, Adam, La Plante, Paul, Lekalake, Telalo, MacMahon, David, Malan, Lourence, Malgas, Cresshim, Maree, Matthys, Martinot, Zachary E., Matsetela, Eunice, Mesinger, Andrei, Molewa, Mathakane, Morales, Miguel F., Mosiane, Tshegofalang, Murray, Steven G., Neben, Abraham R., Nikolic, Bojan, Nunhokee, Chuneeta D., Parsons, Aaron R., Patra, Nipanjana, Pieterse, Samantha, Pober, Jonathan C., Razavi-Ghods, Nima, Ringuette, Jon, Robnett, James, Rosie, Kathryn, Sims, Peter, Singh, Saurabh, Smith, Craig, Syce, Angelo, Thyagarajan, Nithyanandan, Williams, Peter K. G., Zheng, Haoxuan, Massachusetts Institute of Technology. Department of Physics, Tan, Jianrong, Liu, Adrian, Kern, Nicholas S., Abdurashidova, Zara, Aguirre, James E., Alexander, Paul, Ali, Zaki S., Balfour, Yanga, Beardsley, Adam P., Bernardi, Gianni, Billings, Tashalee S., Bowman, Judd D., Bradley, Richard F., Bull, Philip, Burba, Jacob, Carey, Steven, Carilli, Christopher L., Cheng, Carina, DeBoer, David R., Dexter, Matt, de Lera Acedo, Eloy, Dillon, Joshua S., Ely, John, Ewall-Wice, Aaron, Fagnoni, Nicolas, Fritz, Randall, Furlanetto, Steve R., Gale-Sides, Kingsley, Glendenning, Brian, Gorthi, Deepthi, Greig, Bradley, Grobbelaar, Jasper, Halday, Ziyaad, Hazelton, Bryna J., Hewitt, Jacqueline N., Hickish, Jack, Jacobs, Daniel C., Julius, Austin, Kerrigan, Joshua, Kittiwisit, Piyanat, Kohn, Saul A., Kolopanis, Matthew, Lanman, Adam, La Plante, Paul, Lekalake, Telalo, MacMahon, David, Malan, Lourence, Malgas, Cresshim, Maree, Matthys, Martinot, Zachary E., Matsetela, Eunice, Mesinger, Andrei, Molewa, Mathakane, Morales, Miguel F., Mosiane, Tshegofalang, Murray, Steven G., Neben, Abraham R., Nikolic, Bojan, Nunhokee, Chuneeta D., Parsons, Aaron R., Patra, Nipanjana, Pieterse, Samantha, Pober, Jonathan C., Razavi-Ghods, Nima, Ringuette, Jon, Robnett, James, Rosie, Kathryn, Sims, Peter, Singh, Saurabh, Smith, Craig, Syce, Angelo, Thyagarajan, Nithyanandan, Williams, Peter K. G., and Zheng, Haoxuan

Published
2022

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

Author

Abdurashidova, Zara, Aguirre, James E., Alexander, Paul, Ali, Zaki S., Balfour, Yanga, 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, Dibblee-Barkman, Taylor, Dillon, Joshua S., Ely, John, Ewall-Wice, Aaron, Fagnoni, Nicolas, Fritz, Randall, Furlanetto, Steven R., Gale-Sides, Kingsley, Glendenning, Brian, Gorthi, Deepthi, Greig, Bradley, Grobbelaar, Jasper, Halday, Ziyaad, Hazelton, Bryna J., 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, MacMahon, David, Malan, Lourence, Malgas, Cresshim, Maree, Matthys, Martinot, Zachary E., Matsetela, Eunice, Mesinger, Andrei, Molewa, Mathakane, Morales, Miguel F., Mosiane, Tshegofalang, Murray, Steven G., Neben, Abraham R., Nikolic, Bojan, Nunhokee, Chuneeta D., Parsons, Aaron R., Patra, Nipanjana, Pascua, Robert, Pieterse, Samantha, Pober, Jonathan C., Razavi-Ghods, Nima, Ringuette, Jon, Robnett, James, Rosie, Kathryn, Sims, Peter, Singh, Saurabh, Smith, Craig, Syce, Angelo, Thyagarajan, Nithyanandan, Williams, Peter K. G., Zheng, Haoxuan, Abdurashidova, Zara, Aguirre, James E., Alexander, Paul, Ali, Zaki S., Balfour, Yanga, 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, Dibblee-Barkman, Taylor, Dillon, Joshua S., Ely, John, Ewall-Wice, Aaron, Fagnoni, Nicolas, Fritz, Randall, Furlanetto, Steven R., Gale-Sides, Kingsley, Glendenning, Brian, Gorthi, Deepthi, Greig, Bradley, Grobbelaar, Jasper, Halday, Ziyaad, Hazelton, Bryna J., 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, MacMahon, David, Malan, Lourence, Malgas, Cresshim, Maree, Matthys, Martinot, Zachary E., Matsetela, Eunice, Mesinger, Andrei, Molewa, Mathakane, Morales, Miguel F., Mosiane, Tshegofalang, Murray, Steven G., Neben, Abraham R., Nikolic, Bojan, Nunhokee, Chuneeta D., Parsons, Aaron R., Patra, Nipanjana, Pascua, Robert, Pieterse, Samantha, Pober, Jonathan C., Razavi-Ghods, Nima, Ringuette, Jon, Robnett, James, Rosie, Kathryn, Sims, Peter, Singh, Saurabh, Smith, Craig, Syce, Angelo, Thyagarajan, Nithyanandan, Williams, Peter K. G., and Zheng, Haoxuan

Abstract

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 ${{\rm{\Delta }}}_{21}^{2}\leqslant {(30.76)}^{2}\ {\mathrm{mK}}^{2}$ at k = 0.192 h Mpc−1 at z = 7.9, and also ${{\rm{\Delta }}}_{21}^{2}\leqslant {(95.74)}^{2}\ {\mathrm{mK}}^{2}$ 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.

Published
2022

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

Author

Abdurashidova, Zara, primary, Aguirre, James E., additional, Alexander, Paul, additional, Ali, Zaki S., additional, Balfour, Yanga, additional, Beardsley, Adam P., additional, Bernardi, Gianni, additional, Billings, Tashalee S., additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Bull, Philip, additional, Burba, Jacob, additional, Carey, Steve, additional, Carilli, Chris L., additional, Cheng, Carina, additional, DeBoer, David R., additional, Dexter, Matt, additional, de Lera Acedo, Eloy, additional, Dibblee-Barkman, Taylor, additional, Dillon, Joshua S., additional, Ely, John, additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steven R., additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J., additional, Hewitt, Jacqueline N., additional, Hickish, Jack, additional, Jacobs, Daniel C., additional, Julius, Austin, additional, Kern, Nicholas S., additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A., additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, La Plante, Paul, additional, Lekalake, Telalo, additional, Lewis, David, additional, Liu, Adrian, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Maree, Matthys, additional, Martinot, Zachary E., additional, Matsetela, Eunice, additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Morales, Miguel F., additional, Mosiane, Tshegofalang, additional, Murray, Steven G., additional, Neben, Abraham R., additional, Nikolic, Bojan, additional, Nunhokee, Chuneeta D., additional, Parsons, Aaron R., additional, Patra, Nipanjana, additional, Pascua, Robert, additional, Pieterse, Samantha, additional, Pober, Jonathan C., additional, Razavi-Ghods, Nima, additional, Ringuette, Jon, additional, Robnett, James, additional, Rosie, Kathryn, additional, Sims, Peter, additional, Singh, Saurabh, additional, Smith, Craig, additional, Syce, Angelo, additional, Thyagarajan, Nithyanandan, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2022
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57. Validation of the HERA Phase I Epoch of Reionization 21 cm Power Spectrum Software Pipeline

Author

Aguirre, James E., primary, Murray, Steven G., additional, Pascua, Robert, additional, Martinot, Zachary E., additional, Burba, Jacob, additional, Dillon, Joshua S., additional, Jacobs, Daniel C., additional, Kern, Nicholas S., additional, Kittiwisit, Piyanat, additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, Liu, Adrian, additional, Whitler, Lily, additional, Abdurashidova, Zara, additional, Alexander, Paul, additional, Ali, Zaki S., additional, Balfour, Yanga, additional, Beardsley, Adam P., additional, Bernardi, Gianni, additional, Billings, Tashalee S., additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Bull, Philip, additional, Carey, Steve, additional, Carilli, Chris L., additional, Cheng, Carina, additional, DeBoer, David R., additional, Dexter, Matt, additional, de Lera Acedo, Eloy, additional, Ely, John, additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steven R., additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J., additional, Hewitt, Jacqueline N., additional, Hickish, Jack, additional, Julius, Austin, additional, Kerrigan, Joshua, additional, Kohn, Saul A., additional, La Plante, Paul, additional, Lekalake, Telalo, additional, Lewis, David, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Maree, Matthys, additional, Matsetela, Eunice, additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Morales, Miguel F., additional, Mosiane, Tshegofalang, additional, Neben, Abraham R., additional, Nikolic, Bojan, additional, Parsons, Aaron R., additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C., additional, Razavi-Ghods, Nima, additional, Ringuette, Jon, additional, Robnett, James, additional, Rosie, Kathryn, additional, Santos, Mario G., additional, Sims, Peter, additional, Singh, Saurabh, additional, Smith, Craig, additional, Syce, Angelo, additional, Thyagarajan, Nithyanandan, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2022
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58. HERA Phase I Limits on the Cosmic 21 cm Signal: Constraints on Astrophysics and Cosmology during the Epoch of Reionization

Author

Abdurashidova, Zara, primary, Aguirre, James E., additional, Alexander, Paul, additional, Ali, Zaki S., additional, Balfour, Yanga, additional, Barkana, Rennan, additional, Beardsley, Adam P., additional, Bernardi, Gianni, additional, Billings, Tashalee S., additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Bull, Philip, additional, Burba, Jacob, additional, Carey, Steve, additional, Carilli, Chris L., additional, Cheng, Carina, additional, DeBoer, David R., additional, Dexter, Matt, additional, de Lera Acedo, Eloy, additional, Dillon, Joshua S., additional, Ely, John, additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fialkov, Anastasia, additional, Fritz, Randall, additional, Furlanetto, Steven R., additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J., additional, Heimersheim, Stefan, additional, Hewitt, Jacqueline N., additional, Hickish, Jack, additional, Jacobs, Daniel C., additional, Julius, Austin, additional, Kern, Nicholas S., additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A., additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, La Plante, Paul, additional, Lekalake, Telalo, additional, Lewis, David, additional, Liu, Adrian, additional, Ma, Yin-Zhe, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Maree, Matthys, additional, Martinot, Zachary E., additional, Matsetela, Eunice, additional, Mesinger, Andrei, additional, Mirocha, Jordan, additional, Molewa, Mathakane, additional, Morales, Miguel F., additional, Mosiane, Tshegofalang, additional, Muñoz, Julian B., additional, Murray, Steven G., additional, Neben, Abraham R., additional, Nikolic, Bojan, additional, Nunhokee, Chuneeta D., additional, Parsons, Aaron R., additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C., additional, Qin, Yuxiang, additional, Razavi-Ghods, Nima, additional, Reis, Itamar, additional, Ringuette, Jon, additional, Robnett, James, additional, Rosie, Kathryn, additional, Santos, Mario G., additional, Sikder, Sudipta, additional, Sims, Peter, additional, Smith, Craig, additional, Syce, Angelo, additional, Thyagarajan, Nithyanandan, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2022
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59. Automated Detection of Antenna Malfunctions in Large‐ N Interferometers: A Case Study With the Hydrogen Epoch of Reionization Array

Author

Storer, Dara, primary, Dillon, Joshua S., additional, Jacobs, Daniel C., additional, Morales, Miguel F., additional, Hazelton, Bryna J., additional, Ewall‐Wice, Aaron, additional, Abdurashidova, Zara, additional, Aguirre, James E., additional, Alexander, Paul, additional, Ali, Zaki S., additional, Balfour, Yanga, additional, Beardsley, Adam P., additional, Bernardi, Gianni, additional, Billings, Tashalee S., additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Bull, Philip, additional, Burba, Jacob, additional, Carey, Steven, additional, Carilli, Chris L., additional, Cheng, Carina, additional, DeBoer, David R., additional, Lera Acedo, Eloy, additional, Dexter, Matt, additional, Dynes, Scott, additional, Ely, John, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steven R., additional, Gale‐Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hewitt, Jacqueline N., additional, Hickish, Jack, additional, Huang, Tian, additional, Josaitis, Alec, additional, Julius, Austin, additional, Kariseb, MacCalvin, additional, Kern, Nicholas S., additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A., additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, La Plante, Paul, additional, Liu, Adrian, additional, Loots, Anita, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Martinot, Zachary E., additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Mosiane, Tshegofalang, additional, Murray, Steven G., additional, Neben, Abraham R., additional, Nikolic, Bojan, additional, Nunhokee, Chuneeta Devi, additional, Parsons, Aaron R., additional, Pascua, Robert, additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C., additional, Razavi‐Ghods, Nima, additional, Riley, Daniel, additional, Robnett, James, additional, Rosie, Kathryn, additional, Santos, Mario G., additional, Sims, Peter, additional, Singh, Saurabh, additional, Smith, Craig, additional, Tan, Jianrong, additional, Thyagarajan, Nithyanandan, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2022
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60. Methods of Error Estimation for Delay Power Spectra in 21 cm Cosmology

Author

Tan, Jianrong, primary, Liu, Adrian, additional, Kern, Nicholas S., additional, Abdurashidova, Zara, additional, Aguirre, James E., additional, Alexander, Paul, additional, Ali, Zaki S., additional, Balfour, Yanga, additional, Beardsley, Adam P., additional, Bernardi, Gianni, additional, Billings, Tashalee S., additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Bull, Philip, additional, Burba, Jacob, additional, Carey, Steven, additional, Carilli, Christopher L., additional, Cheng, Carina, additional, DeBoer, David R., additional, Dexter, Matt, additional, de Lera Acedo, Eloy, additional, Dillon, Joshua S., additional, Ely, John, additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steve R., additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J., additional, Hewitt, Jacqueline N., additional, Hickish, Jack, additional, Jacobs, Daniel C., additional, Julius, Austin, additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A., additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, La Plante, Paul, additional, Lekalake, Telalo, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Maree, Matthys, additional, Martinot, Zachary E., additional, Matsetela, Eunice, additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Morales, Miguel F., additional, Mosiane, Tshegofalang, additional, Murray, Steven G., additional, Neben, Abraham R., additional, Nikolic, Bojan, additional, Nunhokee, Chuneeta D., additional, Parsons, Aaron R., additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C., additional, Razavi-Ghods, Nima, additional, Ringuette, Jon, additional, Robnett, James, additional, Rosie, Kathryn, additional, Sims, Peter, additional, Singh, Saurabh, additional, Smith, Craig, additional, Syce, Angelo, additional, Thyagarajan, Nithyanandan, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2021
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61. Effects of model incompleteness on the drift-scan calibration of radio telescopes

Author

Gehlot, Bharat K, primary, Jacobs, Daniel C, additional, Bowman, Judd D, additional, Mahesh, Nivedita, additional, Murray, Steven G, additional, Kolopanis, Matthew, additional, Beardsley, Adam P, additional, Abdurashidova, Zara, additional, Aguirre, James E, additional, Alexander, Paul, additional, Ali, Zaki S, additional, Balfour, Yanga, additional, Bernardi, Gianni, additional, Billings, Tashalee S, additional, Bradley, Richard F, additional, Bull, Phil, additional, Burba, Jacob, additional, Carey, Steve, additional, Carilli, Chris L, additional, Cheng, Carina, additional, DeBoer, David R, additional, Dexter, Matt, additional, de Lera Acedo, Eloy, additional, Dillon, Joshua S, additional, Ely, John, additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steven R, additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J, additional, Hewitt, Jacqueline N, additional, Hickish, Jack, additional, Julius, Austin, additional, Kern, Nicholas S, additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A, additional, Lanman, Adam, additional, La Plante, Paul, additional, Lekalake, Telalo, additional, Lewis, David, additional, Liu, Adrian, additional, Ma, Yin-Zhe, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Maree, Matthys, additional, Martinot, Zachary E, additional, Matsetela, Eunice, additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Monsalve, Raul A, additional, Morales, Miguel F, additional, Mosiane, Tshegofalang, additional, Neben, Abraham R, additional, Nikolic, Bojan, additional, Parsons, Aaron R, additional, Pascua, Robert, additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C, additional, Razavi-Ghods, Nima, additional, Ringuette, Jon, additional, Robnett, James, additional, Rosie, Kathryn, additional, Santos, Mario G, additional, Sims, Peter, additional, Smith, Craig, additional, Syce, Angelo, additional, Tegmark, Max, additional, Thyagarajan, Nithyanandan, additional, Williams, Peter K G, additional, and Zheng, Haoxuan, additional

Published
2021
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62. Hydrogen Epoch of Reionization Array (HERA)

Author

Massachusetts Institute of Technology. Department of Physics, MIT Kavli Institute for Astrophysics and Space Research, Hewitt, Jacqueline N., Ewall-Wice, Aaron, Neben, Abraham R., Tegmark, Max Erik, Massachusetts Institute of Technology. Department of Physics, MIT Kavli Institute for Astrophysics and Space Research, Hewitt, Jacqueline N., Ewall-Wice, Aaron, Neben, Abraham R., and Tegmark, Max Erik

Abstract

The Hydrogen Epoch of Reionization Array (HERA) is a staged experiment to measure 21 cm emission from the primordial intergalactic medium (IGM) throughout cosmic reionization (z = 6-12), and to explore earlier epochs of our Cosmic Dawn (z ∼ 30). During these epochs, early stars and black holes heated and ionized the IGM, introducing fluctuations in 21 cm emission. HERA is designed to characterize the evolution of the 21 cm power spectrum to constrain the timing and morphology of reionization, the properties of the first galaxies, the evolution of large-scale structure, and the early sources of heating. The full HERA instrument will be a 350-element interferometer in South Africa consisting of 14 m parabolic dishes observing from 50 to 250 MHz. Currently, 19 dishes have been deployed on site and the next 18 are under construction. HERA has been designated as an SKA Precursor instrument. In this paper, we summarize HERA’s scientific context and provide forecasts for its key science results. After reviewing the current state of the art in foreground mitigation, we use the delay-spectrum technique to motivate high-level performance requirements for the HERA instrument. Next, we present the HERA instrument design, along with the subsystem specifications that ensure that HERA meets its performance requirements. Finally, we summarize the schedule and status of the project. We conclude by suggesting that, given the realities of foreground contamination, current-generation 21 cm instruments are approaching their sensitivity limits. HERA is designed to bring both the sensitivity and the precision to deliver its primary science on the basis of proven foreground filtering techniques, while developing new subtraction techniques to unlock new capabilities. The result will be a major step toward realizing the widely recognized scientific potential of 21 cm cosmology. Keywords: dark ages; reionization; first stars – instrumentation; interferometers – techniques; interferometric–tel, National Science Foundation (U.S.) (AST-1440343), National Science Foundation (U.S.) (AST1410719)

Published
2020

63. Detection of cosmic structures using the bispectrum phase. II. First results from application to cosmic reionization using the Hydrogen Epoch of Reionization Array

Author

Thyagarajan, Nithyanandan, primary, Carilli, Chris L., additional, Nikolic, Bojan, additional, Kent, James, additional, Mesinger, Andrei, additional, Kern, Nicholas S., additional, Bernardi, Gianni, additional, Matika, Siyanda, additional, Abdurashidova, Zara, additional, Aguirre, James E., additional, Alexander, Paul, additional, Ali, Zaki S., additional, Balfour, Yanga, additional, Beardsley, Adam P., additional, Billings, Tashalee S., additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Burba, Jacob, additional, Carey, Steve, additional, Cheng, Carina, additional, DeBoer, David R., additional, Dexter, Matt, additional, Acedo, Eloy de Lera, additional, Dillon, Joshua S., additional, Ely, John, additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steven R., additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J., additional, Hewitt, Jacqueline N., additional, Hickish, Jack, additional, Jacobs, Daniel C., additional, Julius, Austin, additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A., additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, La Plante, Paul, additional, Lekalake, Telalo, additional, Lewis, David, additional, Liu, Adrian, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Maree, Matthys, additional, Martinot, Zachary E., additional, Matsetela, Eunice, additional, Molewa, Mathakane, additional, Morales, Miguel F., additional, Mosiane, Tshegofalang, additional, Neben, Abraham R., additional, Parsons, Aaron R., additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C., additional, Razavi-Ghods, Nima, additional, Ringuette, Jon, additional, Robnett, James, additional, Rosie, Kathryn, additional, Sims, Peter, additional, Smith, Craig, additional, Syce, Angelo, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2020
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64. Measuring HERA's Primary Beam in Situ: Methodology and First Results

Author

Nunhokee, Chuneeta D., primary, Parsons, Aaron R., additional, Kern, Nicholas S., additional, Nikolic, Bojan, additional, Pober, Jonathan C., additional, Bernardi, Gianni, additional, Carilli, Chris L., additional, Abdurashidova, Zara, additional, Aguirre, James E., additional, Alexander, Paul, additional, Ali, Zaki S., additional, Balfour, Yanga, additional, Beardsley, Adam P., additional, Billings, Tashalee S., additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Burba, Jacob, additional, Cheng, Carina, additional, DeBoer, David R., additional, Dexter, Matt, additional, Acedo, Eloy de Lera, additional, Dillon, Joshua S., additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steve R., additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J., additional, Hewitt, Jacqueline N., additional, Jacobs, Daniel C., additional, Julius, Austin, additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A., additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, Plante, Paul La, additional, Lekalake, Telalo, additional, Liu, Adrian, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Maree, Matthys, additional, Martinot, Zachary E., additional, Matsetela, Eunice, additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Morales, Miguel F., additional, Mosiane, Tshegofalang, additional, Neben, Abraham R., additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Razavi-Ghods, Nima, additional, Ringuette, Jon, additional, Robnett, James, additional, Rosie, Kathryn, additional, Sims, Peter, additional, Smith, Craig, additional, Syce, Angelo, additional, Thyagarajan, Nithyanandan, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2020
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65. Imaging and Modeling Data from the Hydrogen Epoch of Reionization Array

Author

Carilli, C. L., primary, Thyagarajan, N., additional, Kent, J., additional, Nikolic, B., additional, Gale-Sides, K., additional, Kern, N. S., additional, Bernardi, G., additional, Mesinger, A., additional, Matika, S., additional, Abdurashidova, Zara, additional, Aguirre, James E., additional, Alexander, Paul, additional, Ali, Zaki S., additional, Balfour, Yanga, additional, Beardsley, Adam P., additional, Billings, Tashalee S., additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Bull, Phil, additional, Burba, Jacob, additional, Cheng, Carina, additional, DeBoer, David R., additional, Dexter, Matt, additional, Acedo, Eloy de Lera, additional, Dillon, Joshua S., additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steve R., additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J., additional, Hewitt, Jacqueline N., additional, Hickish, Jack, additional, Jacobs, Daniel C., additional, Josaitis, Alec, additional, Julius, Austin, additional, Kerrigan, Joshua, additional, Kim, Honggeun, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A., additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, Plante, Paul La, additional, Lekalake, Telalo, additional, Liu, Adrian, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Maree, Matthys, additional, Martinot, Zachary E., additional, Matsetela, Eunice, additional, Molewa, Mathakane, additional, Morales, Miguel F., additional, Mosiane, Tshegofalang, additional, Neben, Abraham R., additional, Parra, Juan Mena, additional, Parsons, Aaron R., additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C., additional, Razavi-Ghods, Nima, additional, Robnett, James, additional, Rosie, Kathryn, additional, Sims, Peter, additional, Syce, Angelo, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2020
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66. Absolute Calibration Strategies for the Hydrogen Epoch of Reionization Array and Their Impact on the 21 cm Power Spectrum

Author

Kern, Nicholas S., primary, Dillon, Joshua S., additional, Parsons, Aaron R., additional, Carilli, Christopher L., additional, Bernardi, Gianni, additional, Abdurashidova, Zara, additional, Aguirre, James E., additional, Alexander, Paul, additional, Ali, Zaki S., additional, Balfour, Yanga, additional, Beardsley, Adam P., additional, Billings, Tashalee S., additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Bull, Philip, additional, Burba, Jacob, additional, Carey, Steven, additional, Cheng, Carina, additional, DeBoer, David R., additional, Dexter, Matt, additional, de Lera Acedo, Eloy, additional, Ely, John, additional, Ewall-Wice, Aaron, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steve R., additional, Gale-Sides, Kingsley, additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J., additional, Hewitt, Jacqueline N., additional, Hickish, Jack, additional, Jacobs, Daniel C., additional, Julius, Austin, additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A., additional, Kolopanis, Matthew, additional, Lanman, Adam, additional, La Plante, Paul, additional, Lekalake, Telalo, additional, Liu, Adrian, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Maree, Matthys, additional, Martinot, Zachary E., additional, Matsetela, Eunice, additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Morales, Miguel F., additional, Mosiane, Tshegofalang, additional, Murray, Steven G., additional, Neben, Abraham R., additional, Nikolic, Bojan, additional, Nunhokee, Chuneeta D., additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C., additional, Razavi-Ghods, Nima, additional, Ringuette, Jon, additional, Robnett, James, additional, Rosie, Kathryn, additional, Sims, Peter, additional, Smith, Craig, additional, Syce, Angelo, additional, Thyagarajan, Nithyanandan, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2020
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67. Mitigating Internal Instrument Coupling for 21 cm Cosmology. II. A Method Demonstration with the Hydrogen Epoch of Reionization Array

Author

Kern, Nicholas S., primary, Parsons, Aaron R., additional, Dillon, Joshua S., additional, Lanman, Adam E., additional, Liu, Adrian, additional, Bull, Philip, additional, Ewall-Wice, Aaron, additional, Abdurashidova, Zara, additional, Aguirre, James E., additional, Alexander, Paul, additional, Ali, Zaki S., additional, Balfour, Yanga, additional, Beardsley, Adam P., additional, Bernardi, Gianni, additional, Bowman, Judd D., additional, Bradley, Richard F., additional, Burba, Jacob, additional, Carilli, Chris L., additional, Cheng, Carina, additional, DeBoer, David R., additional, Dexter, Matt, additional, de Lera Acedo, Eloy, additional, Fagnoni, Nicolas, additional, Fritz, Randall, additional, Furlanetto, Steve R., additional, Glendenning, Brian, additional, Gorthi, Deepthi, additional, Greig, Bradley, additional, Grobbelaar, Jasper, additional, Halday, Ziyaad, additional, Hazelton, Bryna J., additional, Hewitt, Jacqueline N., additional, Hickish, Jack, additional, Jacobs, Daniel C., additional, Julius, Austin, additional, Kerrigan, Joshua, additional, Kittiwisit, Piyanat, additional, Kohn, Saul A., additional, Kolopanis, Matthew, additional, La Plante, Paul, additional, Lekalake, Telalo, additional, MacMahon, David, additional, Malan, Lourence, additional, Malgas, Cresshim, additional, Maree, Matthys, additional, Martinot, Zachary E., additional, Matsetela, Eunice, additional, Mesinger, Andrei, additional, Molewa, Mathakane, additional, Morales, Miguel F., additional, Mosiane, Tshegofalang, additional, Murray, Steven G., additional, Neben, Abraham R., additional, Patra, Nipanjana, additional, Pieterse, Samantha, additional, Pober, Jonathan C., additional, Razavi-Ghods, Nima, additional, Ringuette, Jon, additional, Robnett, James, additional, Rosie, Kathryn, additional, Sims, Peter, additional, Smith, Craig, additional, Syce, Angelo, additional, Thyagarajan, Nithyanandan, additional, Williams, Peter K. G., additional, and Zheng, Haoxuan, additional

Published
2020
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68. Foreground modelling via Gaussian process regression: an application to HERA data

Author

Ghosh, Abhik, primary, Mertens, Florent, primary, Bernardi, Gianni, primary, Santos, Mário G, primary, Kern, Nicholas S, primary, Carilli, Christopher L, primary, Grobler, Trienko L, primary, Koopmans, Léon V E, primary, Jacobs, Daniel C, primary, Liu, Adrian, primary, Parsons, Aaron R, primary, Morales, Miguel F, primary, Aguirre, James E, primary, Dillon, Joshua S, primary, Hazelton, Bryna J, primary, Smirnov, Oleg M, primary, Gehlot, Bharat K, primary, Matika, Siyanda, primary, Alexander, Paul, primary, Ali, Zaki S, primary, Beardsley, Adam P, primary, Benefo, Roshan K, primary, Billings, Tashalee S, primary, Bowman, Judd D, primary, Bradley, Richard F, primary, Cheng, Carina, primary, Chichura, Paul M, primary, DeBoer, David R, primary, Acedo, Eloy de Lera, primary, Ewall-Wice, Aaron, primary, Fadana, Gcobisa, primary, Fagnoni, Nicolas, primary, Fortino, Austin F, primary, Fritz, Randall, primary, Furlanetto, Steve R, primary, Gallardo, Samavarti, primary, Glendenning, Brian, primary, Gorthi, Deepthi, primary, Greig, Bradley, primary, Grobbelaar, Jasper, primary, Hickish, Jack, primary, Josaitis, Alec, primary, Julius, Austin, primary, Igarashi, Amy S, primary, Kariseb, MacCalvin, primary, Kohn, Saul A, primary, Kolopanis, Matthew, primary, Lekalake, Telalo, primary, Loots, Anita, primary, MacMahon, David, primary, Malan, Lourence, primary, Malgas, Cresshim, primary, Maree, Matthys, primary, Martinot, Zachary E, primary, Mathison, Nathan, primary, Matsetela, Eunice, primary, Mesinger, Andrei, primary, Neben, Abraham R, primary, Nikolic, Bojan, primary, Nunhokee, Chuneeta D, primary, Patra, Nipanjana, primary, Pieterse, Samantha, primary, Razavi-Ghods, Nima, primary, Ringuette, Jon, primary, Robnett, James, primary, Rosie, Kathryn, primary, Sell, Raddwine, primary, Smith, Craig, primary, Syce, Angelo, primary, Tegmark, Max, primary, Thyagarajan, Nithyanandan, primary, Williams, Peter K G, primary, and Zheng, Haoxuan, primary

Published
2020
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69. Optimizing sparse RFI prediction using deep learning

Author

Kerrigan, Joshua, primary, Plante, Paul La, primary, Kohn, Saul, primary, Pober, Jonathan C, primary, Aguirre, James, primary, Abdurashidova, Zara, primary, Alexander, Paul, primary, Ali, Zaki S, primary, Balfour, Yanga, primary, Beardsley, Adam P, primary, Bernardi, Gianni, primary, Bowman, Judd D, primary, Bradley, Richard F, primary, Burba, Jacob, primary, Carilli, Chris L, primary, Cheng, Carina, primary, DeBoer, David R, primary, Dexter, Matt, primary, Acedo, Eloy de Lera, primary, Dillon, Joshua S, primary, Estrada, Julia, primary, Ewall-Wice, Aaron, primary, Fagnoni, Nicolas, primary, Fritz, Randall, primary, Furlanetto, Steve R, primary, Glendenning, Brian, primary, Greig, Bradley, primary, Grobbelaar, Jasper, primary, Gorthi, Deepthi, primary, Halday, Ziyaad, primary, Hazelton, Bryna J, primary, Hickish, Jack, primary, Jacobs, Daniel C, primary, Julius, Austin, primary, Kern, Nicholas S, primary, Kittiwisit, Piyanat, primary, Kolopanis, Matthew, primary, Lanman, Adam, primary, Lekalake, Telalo, primary, Liu, Adrian, primary, MacMahon, David, primary, Malan, Lourence, primary, Malgas, Cresshim, primary, Maree, Matthys, primary, Martinot, Zachary E, primary, Matsetela, Eunice, primary, Mesinger, Andrei, primary, Molewa, Mathakane, primary, Morales, Miguel F, primary, Mosiane, Tshegofalang, primary, Neben, Abraham R, primary, Parsons, Aaron R, primary, Patra, Nipanjana, primary, Pieterse, Samantha, primary, Razavi-Ghods, Nima, primary, Ringuette, Jon, primary, Robnett, James, primary, Rosie, Kathryn, primary, Sims, Peter, primary, Smith, Craig, primary, Syce, Angelo, primary, Thyagarajan, Nithyanandan, primary, Williams, Peter K G, primary, and Zheng, Haoxuan, primary

Published
2019
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71. THE HYDROGEN EPOCH OF REIONIZATION ARRAY DISH. II. CHARACTERIZATION OF SPECTRAL STRUCTURE WITH ELECTROMAGNETIC SIMULATIONS AND ITS SCIENCE IMPLICATIONS

Author

Ewall-Wice, Aaron, primary, Bradley, Richard, additional, Deboer, David, additional, Hewitt, Jacqueline, additional, Parsons, Aaron, additional, Aguirre, James, additional, Ali, Zaki S., additional, Bowman, Judd, additional, Cheng, Carina, additional, Neben, Abraham R., additional, Patra, Nipanjana, additional, Thyagarajan, Nithyanandan, additional, Venter, Mariet, additional, Acedo, Eloy de Lera, additional, Dillon, Joshua S., additional, Dickenson, Roger, additional, Doolittle, Phillip, additional, Egan, Dennis, additional, Hedrick, Mike, additional, Klima, Patricia, additional, Kohn, Saul, additional, Schaffner, Patrick, additional, Shelton, John, additional, Saliwanchik, Benjamin, additional, Taylor, H. A., additional, Taylor, Rusty, additional, Tegmark, Max, additional, and Wirt, Butch, additional

Published
2016
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72. BEAM-FORMING ERRORS IN MURCHISON WIDEFIELD ARRAY PHASED ARRAY ANTENNAS AND THEIR EFFECTS ON EPOCH OF REIONIZATION SCIENCE

Author

Neben, Abraham R., primary, Hewitt, Jacqueline N., additional, Bradley, Richard F., additional, Dillon, Joshua S., additional, Bernardi, G., additional, Bowman, J. D., additional, Briggs, F., additional, Cappallo, R. J., additional, Corey, B. E., additional, Deshpande, A. A., additional, Goeke, R., additional, Greenhill, L. J., additional, Hazelton, B. J., additional, Johnston-Hollitt, M., additional, Kaplan, D. L., additional, Lonsdale, C. J., additional, McWhirter, S. R., additional, Mitchell, D. A., additional, Morales, M. F., additional, Morgan, E., additional, Oberoi, D., additional, Ord, S. M., additional, Prabu, T., additional, Shankar, N. Udaya, additional, Srivani, K. S., additional, Subrahmanyan, R., additional, Tingay, S. J., additional, Wayth, R. B., additional, Webster, R. L., additional, Williams, A., additional, and Williams, C. L., additional

Published
2016
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73. Empirical covariance modeling for 21 cm power spectrum estimation: A method demonstration and new limits from early Murchison Widefield Array 128-tile data

Author

Dillon, Joshua S., primary, Neben, Abraham R., additional, Hewitt, Jacqueline N., additional, Tegmark, Max, additional, Barry, N., additional, Beardsley, A. P., additional, Bowman, J. D., additional, Briggs, F., additional, Carroll, P., additional, de Oliveira-Costa, A., additional, Ewall-Wice, A., additional, Feng, L., additional, Greenhill, L. J., additional, Hazelton, B. J., additional, Hernquist, L., additional, Hurley-Walker, N., additional, Jacobs, D. C., additional, Kim, H. S., additional, Kittiwisit, P., additional, Lenc, E., additional, Line, J., additional, Loeb, A., additional, McKinley, B., additional, Mitchell, D. A., additional, Morales, M. F., additional, Offringa, A. R., additional, Paul, S., additional, Pindor, B., additional, Pober, J. C., additional, Procopio, P., additional, Riding, J., additional, Sethi, S., additional, Shankar, N. Udaya, additional, Subrahmanyan, R., additional, Sullivan, I., additional, Thyagarajan, Nithyanandan, additional, Tingay, S. J., additional, Trott, C., additional, Wayth, R. B., additional, Webster, R. L., additional, Wyithe, S., additional, Bernardi, G., additional, Cappallo, R. J., additional, Deshpande, A. A., additional, Johnston-Hollitt, M., additional, Kaplan, D. L., additional, Lonsdale, C. J., additional, McWhirter, S. R., additional, Morgan, E., additional, Oberoi, D., additional, Ord, S. M., additional, Prabu, T., additional, Srivani, K. S., additional, Williams, A., additional, and Williams, C. L., additional

Published
2015
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76. BEYOND H0 AND q0: COSMOLOGY IS NO LONGER JUST TWO NUMBERS.

Author

NEBEN, ABRAHAM R. and TURNER, MICHAEL S.

Subjects
*METAPHYSICAL cosmology, *SUPERNOVAE, *MONTE Carlo method, *SUPERNOVAE as distance indicators, *REDSHIFT
Abstract

For decades, H0 and q0 were the quest of cosmology, as they promised to characterize our “world model” without reference to a specific cosmological framework. Using Monte Carlo simulations, we show that q0 cannot be directly measured using distance indicators with both accuracy (without offset away from its true value) and precision (small error bar). While H0 can be measured with accuracy and precision, to avoid a small bias in its direct measurement (of order 5%) we demonstrate that the pair H0 and ΩM (assuming flatness and w = −1) is a better choice of two parameters, even if our world model is not precisely ΛCDM. We illustrate this with analysis of the Constitution set of supernovae and indirectly infer q0 = −0.57±−0.04. Finally, we show that it may be possible to directly determine q0 with both accuracy and precision using the time dependence of redshifts (“redshift drift”). [ABSTRACT FROM AUTHOR]

Published
2013
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77. Automated Detection of Antenna Malfunctions in Large‐NInterferometers: A Case Study With the Hydrogen Epoch of Reionization Array

Author

Storer, Dara, Dillon, Joshua S., Jacobs, Daniel C., Morales, Miguel F., Hazelton, Bryna J., Ewall‐Wice, Aaron, Abdurashidova, Zara, Aguirre, James E., Alexander, Paul, Ali, Zaki S., Balfour, Yanga, Beardsley, Adam P., Bernardi, Gianni, Billings, Tashalee S., Bowman, Judd D., Bradley, Richard F., Bull, Philip, Burba, Jacob, Carey, Steven, Carilli, Chris L., Cheng, Carina, DeBoer, David R., Lera Acedo, Eloy, Dexter, Matt, Dynes, Scott, Ely, John, Fagnoni, Nicolas, Fritz, Randall, Furlanetto, Steven R., Gale‐Sides, Kingsley, Glendenning, Brian, Gorthi, Deepthi, Greig, Bradley, Grobbelaar, Jasper, Halday, Ziyaad, Hewitt, Jacqueline N., Hickish, Jack, Huang, Tian, Josaitis, Alec, Julius, Austin, Kariseb, MacCalvin, Kern, Nicholas S., Kerrigan, Joshua, Kittiwisit, Piyanat, Kohn, Saul A., Kolopanis, Matthew, Lanman, Adam, La Plante, Paul, Liu, Adrian, Loots, Anita, MacMahon, David, Malan, Lourence, Malgas, Cresshim, Martinot, Zachary E., Mesinger, Andrei, Molewa, Mathakane, Mosiane, Tshegofalang, Murray, Steven G., Neben, Abraham R., Nikolic, Bojan, Nunhokee, Chuneeta Devi, Parsons, Aaron R., Pascua, Robert, Patra, Nipanjana, Pieterse, Samantha, Pober, Jonathan C., Razavi‐Ghods, Nima, Riley, Daniel, Robnett, James, Rosie, Kathryn, Santos, Mario G., Sims, Peter, Singh, Saurabh, Smith, Craig, Tan, Jianrong, Thyagarajan, Nithyanandan, Williams, Peter K. G., and Zheng, Haoxuan

Abstract

We present a framework for identifying and flagging malfunctioning antennas in large radio interferometers. We outline two distinct categories of metrics designed to detect outliers along known failure modes of large arrays: cross‐correlation metrics, based on all antenna pairs, and auto‐correlation metrics, based solely on individual antennas. We define and motivate the statistical framework for all metrics used, and present tailored visualizations that aid us in clearly identifying new and existing systematics. We implement these techniques using data from 105 antennas in the Hydrogen Epoch of Reionization Array (HERA) as a case study. Finally, we provide a detailed algorithm for implementing these metrics as flagging tools on real data sets. Monitoring the performance of a many‐element system is essential to acquiring science‐quality data and requires an automated approachWe define metrics based on cross‐correlations that assess the health of the whole array and its component subsystems in an automated wayWe outline metrics based on autocorrelations that identify systematics and provide a generalizable approach to automated antenna flagging Monitoring the performance of a many‐element system is essential to acquiring science‐quality data and requires an automated approach We define metrics based on cross‐correlations that assess the health of the whole array and its component subsystems in an automated way We outline metrics based on autocorrelations that identify systematics and provide a generalizable approach to automated antenna flagging

Published
2022
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78. Direct Optimal Mapping for 21cm Cosmology: A Demonstration with the Hydrogen Epoch of Reionization Array

Author

Xu, Z, Hewitt, JN, Chen, KF, Kim, H, Dillon, JS, Kern, NS, Morales, MF, Hazelton, BJ, Byrne, R, Fagnoni, N, Acedo, EDL, Abdurashidova, Z, Adams, T, Aguirre, JE, Alexander, P, Ali, ZS, Baartman, R, Balfour, Y, Beardsley, AP, Bernardi, G, Billings, TS, Bowman, JD, Bradley, RF, Bull, P, Burba, J, Carey, S, Carilli, CL, Cheng, C, DeBoer, DR, Dexter, M, Eksteen, N, Ely, J, Ewall-Wice, A, Fritz, R, Furlanetto, Gale-Sides, K, Glendenning, B, Gorthi, D, Greig, B, Grobbelaar, J, Halday, Z, Hickish, J, Jacobs, DC, Julius, A, Kariseb, M, Kerrigan, J, Kittiwisit, P, Kohn, SA, Kolopanis, M, Lanman, A, Plante, PL, Liu, A, Loots, A, Ma, YZ, Edward MacMahon, DH, Malan, L, Malgas, C, Malgas, K, Marero, B, Martinot, ZE, Mesinger, A, Molewa, M, Mosiane, T, Murray, SG, Neben, AR, Nikolic, B, Nuwegeld, H, Parsons, AR, Patra, N, Pieterse, S, Pober, JC, Razavi-Ghods, N, Robnett, J, Rosie, K, Sims, P, Smith, C, Swarts, H, Thyagarajan, N, Wyngaarden, PVV, Williams, PKG, Zheng, H, Xu, Z [0000-0001-5112-2567], Hewitt, JN [0000-0002-4117-570X], Chen, KF [0000-0002-3839-0230], Dillon, JS [0000-0003-3336-9958], Kern, NS [0000-0002-8211-1892], Morales, MF [0000-0001-7694-4030], Hazelton, BJ [0000-0001-7532-645X], Byrne, R [0000-0003-4980-2736], Aguirre, JE [0000-0002-4810-666X], Beardsley, AP [0000-0001-9428-8233], Bernardi, G [0000-0002-0916-7443], Bowman, JD [0000-0002-8475-2036], Bradley, RF [0000-0003-1172-8331], Bull, P [0000-0001-5668-3101], Carilli, CL [0000-0001-6647-3861], DeBoer, DR [0000-0003-3197-2294], Ewall-Wice, A [0000-0002-0086-7363], Furlanetto, SR [0000-0002-0658-1243], Gorthi, D [0000-0002-0829-167X], Greig, B [0000-0002-4085-2094], Jacobs, DC [0000-0002-0917-2269], Kerrigan, J [0000-0002-1876-272X], Kittiwisit, P [0000-0003-0953-313X], Kohn, SA [0000-0001-6744-5328], Kolopanis, M [0000-0002-2950-2974], Lanman, A [0000-0003-2116-3573], Plante, PL [0000-0002-4693-0102], Liu, A [0000-0001-6876-0928], Ma, YZ [0000-0001-8108-0986], Mesinger, A [0000-0003-3374-1772], Murray, SG [0000-0003-3059-3823], Neben, AR [0000-0001-7776-7240], Parsons, AR [0000-0002-5400-8097], Patra, N [0000-0002-9457-1941], Pober, JC [0000-0002-3492-0433], Sims, P [0000-0002-2871-0413], Thyagarajan, N [0000-0003-1602-7868], Williams, PKG [0000-0003-3734-3587], Apollo - University of Cambridge Repository, Xu, Zhilei, Hewitt, Jacqueline N., Chen, Kai-Feng, Kim, Honggeun, Dillon, Joshua S., Kern, Nicholas S., Morales, Miguel F., Hazelton, Bryna J., Byrne, Ruby, Fagnoni, Nicola, de Lera Acedo, Eloy, Abdurashidova, Zara, Adams, Tyrone, Aguirre, James E., Alexander, Paul, Ali, Zaki S., Baartman, Rushelle, Balfour, Yanga, Beardsley, Adam P., Bernardi, Gianni, Billings, Tashalee S., Bowman, Judd D., Bradley, Richard F., Bull, Philip, Burba, Jacob, Carey, Steven, Carilli, Chris L., Cheng, Carina, Deboer, David R., Dexter, Matt, Eksteen, Nico, Ely, John, Ewall-Wice, Aaron, Fritz, Randall, Furlanetto, Steven R., Gale-Sides, Kingsley, Glendenning, Brian, Gorthi, Deepthi, Greig, Bradley, Grobbelaar, Jasper, Halday, Ziyaad, Hickish, Jack, Jacobs, Daniel C., Julius, Austin, Kariseb, Maccalvin, Kerrigan, Joshua, Kittiwisit, Piyanat, Kohn, Saul A., Kolopanis, Matthew, Lanman, Adam, La Plante, Paul, Liu, Adrian, Loots, Anita, Ma, Yin-Zhe, Harold Edward MacMahon, David, Malan, Lourence, Malgas, Cresshim, Malgas, Keith, Marero, Bradley, Martinot, Zachary E., Mesinger, ANDREI ALBERT, Molewa, Mathakane, Mosiane, Tshegofalang, Murray, Steven G., Neben, Abraham R., Nikolic, Bojan, Nuwegeld, Han, Parsons, Aaron R., Patra, Nipanjana, Pieterse, Samantha, Pober, Jonathan C., Razavi-Ghods, Nima, Robnett, Jame, Rosie, Kathryn, Sims, Peter, Smith, Craig, Swarts, Hilton, Thyagarajan, Nithyanandan, Van Van Wyngaarden, Pieter, Williams, Peter K. G., and Zheng, Haoxuan

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), model, maps, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Galactic radio-emission, 5109 Space Sciences, power spectrum, calibration, 10 mhz, Settore FIS/05 - Astronomia e Astrofisica, 5101 Astronomical Sciences, Space and Planetary Science, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), upper limit, 51 Physical Sciences, 5107 Particle and High Energy Physics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Motivated by the desire for wide-field images with well-defined statistical properties for 21cm cosmology, we implement an optimal mapping pipeline that computes a maximum likelihood estimator for the sky using the interferometric measurement equation. We demonstrate this direct optimal mapping with data from the Hydrogen Epoch of Reionization (HERA) Phase I observations. After validating the pipeline with simulated data, we develop a maximum likelihood figure-of-merit for comparing four sky models at 166MHz with a bandwidth of 100kHz. The HERA data agree with the GLEAM catalogs to, 16 pages, 10 figures, 2 tables, published on ApJ

Published
2022

79. Imaging and Modeling Data from the Hydrogen Epoch of Reionization Array

Author

Juan Mena Parra, Piyanat Kittiwisit, Kingsley Gale-Sides, Joshua Kerrigan, Honggeun Kim, Adrian Liu, Phil Bull, Nipanjana Patra, Ziyaad Halday, Matthys Maree, James E. Aguirre, Bryna J. Hazelton, Jacqueline N. Hewitt, Zara Abdurashidova, Saul A. Kohn, Judd D. Bowman, Matt Dexter, K. Gale-Sides, Samantha Pieterse, Paul La Plante, Mathakane Molewa, James Kent, Nithyanandan Thyagarajan, Eunice Matsetela, Nicolas Fagnoni, Adam P. Beardsley, Alec Josaitis, Kathryn Rosie, David MacMahon, Jonathan C. Pober, Andrei Mesinger, Jasper Grobbelaar, Tashalee S. Billings, Zachary E. Martinot, Tshegofalang Mosiane, Abraham R. Neben, Austin Julius, Randall Fritz, Siyanda Matika, Brian Glendenning, Carina Cheng, Peter Sims, Paul Alexander, Daniel C. Jacobs, Steve R. Furlanetto, Gianni Bernardi, Bradley Greig, Lourence Malan, Nima Razavi-Ghods, Cresshim Malgas, Yanga Balfour, Nicholas S. Kern, Telalo Lekalake, David DeBoer, Aaron R. Parsons, Richard F. Bradley, Matthew Kolopanis, Deepthi Gorthi, Peter K. G. Williams, James Robnett, Joshua S. Dillon, Chris Carilli, Eloy de Lera Acedo, Miguel F. Morales, Zaki S. Ali, Bojan Nikolic, Aaron Ewall-Wice, Jack Hickish, Jacob Burba, Angelo Syce, Haoxuan Zheng, Adam Lanman, ITA, USA, ZAF, Carilli, C. L., Thyagarajan, N., Kent, J., Nikolic, B., Gale-Sides, K., Kern, N. S., Bernardi, G., Mesinger, A., Matika, S., Abdurashidova, Zara, Aguirre, James E., Paul, Alexander Christian, Ali, Zaki S., Balfour, Yanga, Beardsley, Adam P., Billings, Tashalee S., Bowman, Judd D., Bradley, Richard F., Bull, Phil, Burba, Jacob, Cheng, Carina, Deboer, David R., Dexter, Matt, Acedo, Eloy de Lera, Dillon, Joshua S., Ewall-Wice, Aaron, Fagnoni, Nicola, Fritz, Randall, Furlanetto, Steve R., Gale-Sides, Kingsley, Glendenning, Brian, Gorthi, Deepthi, Greig, Bradley, Grobbelaar, Jasper, Halday, Ziyaad, Hazelton, Bryna J., Hewitt, Jacqueline N., Hickish, Jack, Jacobs, Daniel C., Josaitis, Alec, Julius, Austin, Kerrigan, Joshua, Kim, Honggeun, Kittiwisit, Piyanat, Kohn, Saul A., Kolopanis, Matthew, Lanman, Adam, Plante, Paul La, Lekalake, Telalo, Liu, Adrian, Macmahon, David, Malan, Lourence, Malgas, Cresshim, Maree, Matthy, Martinot, Zachary E., Matsetela, Eunice, Molewa, Mathakane, Morales, Miguel F., Mosiane, Tshegofalang, Neben, Abraham R., Parra, Juan Mena, Parsons, Aaron R., Patra, Nipanjana, Pieterse, Samantha, Pober, Jonathan C., Razavi-Ghods, Nima, Robnett, Jame, Rosie, Kathryn, Sims, Peter, Syce, Angelo, Williams, Peter K. G., Zheng, Haoxuan, Carilli, CL [0000-0001-6647-3861], Thyagarajan, N [0000-0003-1602-7868], Kern, NS [0000-0002-8211-1892], Bernardi, G [0000-0002-0916-7443], Aguirre, JE [0000-0002-4810-666X], Beardsley, AP [0000-0001-9428-8233], Bowman, JD [0000-0002-8475-2036], Bull, P [0000-0001-5668-3101], Dillon, JS [0000-0003-3336-9958], Ewall-Wice, A [0000-0002-0086-7363], Furlanetto, SR [0000-0002-0658-1243], Hazelton, BJ [0000-0001-7532-645X], Jacobs, DC [0000-0002-0917-2269], Kerrigan, J [0000-0002-1876-272X], Kittiwisit, P [0000-0003-0953-313X], Kohn, SA [0000-0001-6744-5328], Kolopanis, M [0000-0002-2950-2974], Liu, A [0000-0001-6876-0928], Morales, MF [0000-0001-7694-4030], Neben, AR [0000-0001-7776-7240], Patra, N [0000-0002-9457-1941], Pober, JC [0000-0002-3492-0433], Williams, PKG [0000-0003-3734-3587], and Apollo - University of Cambridge Repository

Subjects
Physics, Cosmological evolution, Hydrogen, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, chemistry.chemical_element, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Cosmology, Data modeling, chemistry, Reionization, Space and Planetary Science, 0103 physical sciences, Radio interferometry, Astrophysics - Instrumentation and Methods for Astrophysics, 010303 astronomy & astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract

We analyze data from the Hydrogen Epoch of Reionization Array. This is the third in a series of papers on the closure phase delay-spectrum technique designed to detect the HI 21cm emission from cosmic reionization. We present the details of the data and models employed in the power spectral analysis, and discuss limitations to the process. We compare images and visibility spectra made with HERA data, to parallel quantities generated from sky models based on the GLEAM survey, incorporating the HERA telescope model. We find reasonable agreement between images made from HERA data, with those generated from the models, down to the confusion level. For the visibility spectra, there is broad agreement between model and data across the full band of $\sim 80$MHz. However, models with only GLEAM sources do not reproduce a roughly sinusoidal spectral structure at the tens of percent level seen in the observed visibility spectra on scales $\sim 10$ MHz on 29 m baselines. We find that this structure is likely due to diffuse Galactic emission, predominantly the Galactic plane, filling the far sidelobes of the antenna primary beam. We show that our current knowledge of the frequency dependence of the diffuse sky radio emission, and the primary beam at large zenith angles, is inadequate to provide an accurate reproduction of the diffuse structure in the models. We discuss implications due to this missing structure in the models, including calibration, and in the search for the HI 21cm signal, as well as possible mitigation techniques., Comment: 17 pages, 10 figures, accepted for the ApJ Supplement

Published
2020

80. The hydrogen epoch of reionization array dish III: measuring chromaticity of prototype element with reflectometry

Author

Aaron R. Parsons, Adam P. Beardsley, Cherie Day, Haoxuan Zheng, Joshua S. Dillon, Gcobisa Fadana, Bradley Greig, Jacqueline N. Hewitt, Craig Smith, Daniel C. Jacobs, Anna Lebedeva, Richard F. Bradley, Cresshim Malgas, Brian Glendenning, Carina Cheng, Peter K. G. Williams, Jonathan C. Pober, Andrei Mesinger, Abraham R. Neben, Nima Razavi-Ghods, Randall Fritz, Nipanjana Patra, Jasper Grobbelaar, Paul Alexander, Nithyanandan Thyagarajan, David DeBoer, Gilbert Hsyu, Steve R. Furlanetto, Kathryn Rosie, Max Tegmark, Nicolas Fagnoni, Lourence Malan, Angelo Syce, Zachary E. Martinot, David MacMahon, Jon Ringuette, Adrian Liu, Saul A. Kohn, James Robnett, Chris Carilli, Eloy de Lera Acedo, Nathan Mathison, Austin Julius, Judd D. Bowman, Samantha Pieterse, Anita Loots, Tsz Kuk Leung, Raddwine Sell, Eunice Matsetela, Miguel F. Morales, Bryna J. Hazelton, Zaki S. Ali, MacCalvin Kariseb, Aaron Ewall-Wice, James E. Aguirre, Matthys Maree, Telalo Lekalake, Patra, Nipanjana, Parsons, Aaron R., Deboer, David R., Thyagarajan, Nithyanandan, Ewall-Wice, Aaron, Hsyu, Gilbert, Leung, Tsz Kuk, Day, Cherie K., de Lera Acedo, Eloy, Aguirre, James E., Alexander, Paul, Ali, Zaki S., Beardsley, Adam P., Bowman, Judd D., Bradley, Richard F., Carilli, Chris L., Cheng, Carina, Dillon, Joshua S., Fadana, Gcobisa, Fagnoni, Nicola, Fritz, Randall, Furlanetto, Steve R., Glendenning, Brian, Greig, Bradley, Grobbelaar, Jasper, Hazelton, Bryna J., Jacobs, Daniel C., Julius, Austin, Kariseb, Mac. Calvin., Kohn, Saul A., Lebedeva, Anna, Lekalake, Telalo, Liu, Adrian, Loots, Anita, Macmahon, David, Malan, Lourence, Malgas, Cresshim, Maree, Matthy, Martinot, Zachary, Mathison, Nathan, Matsetela, Eunice, Mesinger, Andrei, Morales, Miguel F., Neben, Abraham R., Pieterse, Samantha, Pober, Jonathan C., Razavi-Ghods, Nima, Ringuette, Jon, Robnett, Jame, Rosie, Kathryn, Sell, Raddwine, Smith, Craig, Syce, Angelo, Tegmark, Max, Williams, Peter K. G., and Zheng, Haoxuan

Subjects
Frequency response, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astronomy & Astrophysics, 01 natural sciences, Astronomical instrumentation, Methods and techniques-wideband radio interferometry, Optics, 0103 physical sciences, cm cosmology, 010306 general physics, Reflectometry, Instrumentation and Methods for Astrophysics (astro-ph.IM), 010303 astronomy & astrophysics, Reionization, Physics, Delay spectrum technique-EoR power spectrum, business.industry, Attenuation, Astrophysics::Instrumentation and Methods for Astrophysics, Delay spectrum technique–EoR power spectrum, Spectral density, Astronomy and Astrophysics, HERA, Astronomy and Astrophysic, Methods and technique, Redshift, wideband radio interferometry, Space and Planetary Science, 21 cm cosmology, Antenna (radio), Astrophysics - Instrumentation and Methods for Astrophysics, business, Astronomical and Space Sciences, astro-ph.IM
Abstract

The experimental efforts to detect the redshifted 21 cm signal from the Epoch of Reionization (EoR) are limited predominantly by the chromatic instrumental systematic effect. The delay spectrum methodology for 21 cm power spectrum measurements brought new attention to the critical impact of an antenna's chromaticity on the viability of making this measurement. This methodology established a straightforward relationship between time-domain response of an instrument and the power spectrum modes accessible to a 21 cm EoR experiment. We examine the performance of a prototype of the Hydrogen Epoch of Reionization Array (HERA) array element that is currently observing in Karoo desert, South Africa. We present a mathematical framework to derive the beam integrated frequency response of a HERA prototype element in reception from the return loss measurements between 100-200 MHz and determined the extent of additional foreground contamination in the delay space. The measurement reveals excess spectral structures in comparison to the simulation studies of the HERA element. Combined with the HERA data analysis pipeline that incorporates inverse covariance weighting in optimal quadratic estimation of power spectrum, we find that in spite of its departure from the simulated response, HERA prototype element satisfies the necessary criteria posed by the foreground attenuation limits and potentially can measure the power spectrum at spatial modes as low as $k_{\parallel} > 0.1h$~Mpc$^{-1}$. The work highlights a straightforward method for directly measuring an instrument response and assessing its impact on 21 cm EoR power spectrum measurements for future experiments that will use reflector-type antenna., 13 pages, 10 figures, Submitted to APJ

Published
2018
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81. Hydrogen Epoch of Reionization Array (HERA)

Author

Paul Alexander, Lourence Malan, David MacMahon, Daniel C. Jacobs, Jon Ringuette, C. H. Smith, Angelo Syce, Cresshim Malgas, Aaron R. Parsons, Nicolas Fagnoni, Joshua S. Dillon, Miguel F. Morales, Nithyanandan Thyagarajan, Richard F. Bradley, Peter Williams, Zaki S. Ali, Telalo Lekalake, Aaron Ewall-Wice, Nipanjana Patra, Eloy de Lera Acedo, Jonathan C. Pober, Nathan Mathison, Andrei Mesinger, Nima Razavi-Ghods, Gianni Bernardi, Bradley Greig, Steve R. Furlanetto, Jasper Grobbelaar, David DeBoer, Adrian Liu, Matthys Maree, Saul A. Kohn, Zachary E. Martinot, Anita Loots, Brian Glendenning, Carina Cheng, Judd D. Bowman, Raddwine Sell, Kathryn Rosie, Samantha Pieterse, Adam P. Beardsley, Gcobisa Fadana, Bryna J. Hazelton, Jacqueline N. Hewitt, Haoxuan Zheng, James E. Aguirre, James Robnett, Abraham R. Neben, Randall Fritz, Austin Julius, Chris L. Carilli, Jack Hickish, Eunice Matsetela, MacCalvin Kariseb, Max Tegmark, ITA, USA, Deboer, David R., Parsons, Aaron R., Aguirre, James E., Alexander, Paul, Ali, Zaki S., Beardsley, Adam P., Bernardi, Gianni, Bowman, Judd D., Bradley, Richard F., Carilli, Chris L., Cheng, Carina, Acedo, Eloy de Lera, Dillon, Joshua S., Ewall-Wice, Aaron, Fadana, Gcobisa, Fagnoni, Nicola, Fritz, Randall, Furlanetto, Steve R., Glendenning, Brian, Greig, Bradley, Grobbelaar, Jasper, Hazelton, Bryna J., Hewitt, Jacqueline N., Hickish, Jack, Jacobs, Daniel C., Julius, Austin, Kariseb, Maccalvin, Kohn, Saul A., Lekalake, Telalo, Liu, Adrian, Loots, Anita, Macmahon, David, Malan, Lourence, Malgas, Cresshim, Maree, Matthy, Martinot, Zachary, Mathison, Nathan, Matsetela, Eunice, Mesinger, Andrei, Morales, Miguel F., Neben, Abraham R., Patra, Nipanjana, Pieterse, Samantha, Pober, Jonathan C., Razavi-Ghods, Nima, Ringuette, Jon, Robnett, Jame, Rosie, Kathryn, Sell, Raddwine, Smith, Craig, Syce, Angelo, Tegmark, Max, Thyagarajan, Nithyanandan, Williams, Peter K. G., and Zheng, Haoxuan

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Bryna, Dark age, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 7. Clean energy, 01 natural sciences, Reionization, Settore FIS/05 - Astronomia e Astrofisica, First star, 0103 physical sciences, Physical Sciences and Mathematics, Theology, Telescope, 010303 astronomy & astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Astrophysics::Galaxy Astrophysics, biology, 010308 nuclear & particles physics, Philosophy, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, HERA, biology.organism_classification, Space and Planetary Science, Interferometer [Instrumentation], Interferometric [Techniques], Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The Hydrogen Epoch of Reionization Array (HERA) is a staged experiment to measure 21 cm emission from the primordial intergalactic medium (IGM) throughout cosmic reionization ($z=6-12$), and to explore earlier epochs of our Cosmic Dawn ($z\sim30$). During these epochs, early stars and black holes heated and ionized the IGM, introducing fluctuations in 21 cm emission. HERA is designed to characterize the evolution of the 21 cm power spectrum to constrain the timing and morphology of reionization, the properties of the first galaxies, the evolution of large-scale structure, and the early sources of heating. The full HERA instrument will be a 350-element interferometer in South Africa consisting of 14-m parabolic dishes observing from 50 to 250 MHz. Currently, 19 dishes have been deployed on site and the next 18 are under construction. HERA has been designated as an SKA Precursor instrument. In this paper, we summarize HERA's scientific context and provide forecasts for its key science results. After reviewing the current state of the art in foreground mitigation, we use the delay-spectrum technique to motivate high-level performance requirements for the HERA instrument. Next, we present the HERA instrument design, along with the subsystem specifications that ensure that HERA meets its performance requirements. Finally, we summarize the schedule and status of the project. We conclude by suggesting that, given the realities of foreground contamination, current-generation 21 cm instruments are approaching their sensitivity limits. HERA is designed to bring both the sensitivity and the precision to deliver its primary science on the basis of proven foreground filtering techniques, while developing new subtraction techniques to unlock new capabilities. The result will be a major step toward realizing the widely recognized scientific potential of 21 cm cosmology., Comment: 26 pages, 24 figures, 2 tables

Published
2016
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