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Your search keyword '"Jha, Saurabh W. [0000-0001-8738-6011]"' showing total 2 results
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2 results on '"Jha, Saurabh W. [0000-0001-8738-6011]"'

1. A BayeSN distance ladder: H0 from a consistent modelling of Type Ia supernovae from the optical to the near-infrared

Author

Dhawan, Suhail, Thorp, Stephen, Mandel, Kaisey S, Ward, Sam M, Narayan, Gautham, Jha, Saurabh W, Chant, Thaisen, Dhawan, Suhail [0000-0002-2376-6979], Mandel, Kaisey S [0000-0001-9846-4417], Jha, Saurabh W [0000-0001-8738-6011], Chant, Thaisen [0000-0002-4296-6765], and Apollo - University of Cambridge Repository

Subjects
5109 Space Sciences, 51 Physical Sciences
Abstract

The local distance ladder estimate of the Hubble constant (H0) is important in cosmology, given the recent tension with the early universe inference. We estimate H0 from the Type Ia supernova (SN Ia) distance ladder, inferring SN Ia distances with the hierarchical Bayesian SED model, BayeSN. This method has a notable advantage of being able to continuously model the optical and near-infrared (NIR) SN Ia light curves simultaneously. We use two independent distance indicators, Cepheids or the tip of the red giant branch (TRGB), to calibrate a Hubble-flow sample of 67 SNe Ia with optical and NIR data. We estimate H0 = 74.82 ± 0.97 (stat) $\pm \, 0.84$ (sys) km ${\rm s}^{-1}\, {\rm Mpc}^{-1}$ when using the calibration with Cepheid distances to 37 host galaxies of 41 SNe Ia, and 70.92 ± 1.14 (stat) $\pm \, 1.49$ (sys) km ${\rm s}^{-1}\, {\rm Mpc}^{-1}$ when using the calibration with TRGB distances to 15 host galaxies of 18 SNe Ia. For both methods, we find a low intrinsic scatter σint ≲ 0.1 mag. We test various selection criteria and do not find significant shifts in the estimate of H0. Simultaneous modelling of the optical and NIR yields up to ∼15 per cent reduction in H0 uncertainty compared to the equivalent optical-only cases. With improvements expected in other rungs of the distance ladder, leveraging joint optical-NIR SN Ia data can be critical to reducing the H0 error budget.

Published
2023

2. A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ∼ 12 Galaxy in Early JWST CEERS Imaging

Author

Finkelstein, Steven L., Bagley, Micaela B., Haro, Pablo Arrabal, Dickinson, Mark, Ferguson, Henry C., Kartaltepe, Jeyhan S., Papovich, Casey, Burgarella, Denis, Kocevski, Dale D., Huertas-Company, Marc, Iyer, Kartheik G., Koekemoer, Anton M., Larson, Rebecca L., Pérez-González, Pablo G., Rose, Caitlin, Tacchella, Sandro, Wilkins, Stephen M., Chworowsky, Katherine, Medrano, Aubrey, Morales, Alexa M., Somerville, Rachel S., Yung, L. Y. Aaron, Fontana, Adriano, Giavalisco, Mauro, Grazian, Andrea, Grogin, Norman A., Kewley, Lisa J., Kirkpatrick, Allison, Kurczynski, Peter, Lotz, Jennifer M., Pentericci, Laura, Pirzkal, Nor, Ravindranath, Swara, Ryan, Russell E., Jr., Trump, Jonathan R., Yang, Guang, and The CEERS Team, Almaini, Omar, Amorín, Ricardo O., Annunziatella, Marianna, Backhaus, Bren E., Barro, Guillermo, Behroozi, Peter, Bell, Eric F., Bhatawdekar, Rachana, Bisigello, Laura, Bromm, Volker, Buat, Véronique, Buitrago, Fernando, Calabrò, Antonello, Casey, Caitlin M., Castellano, Marco, Chávez Ortiz, Óscar A., Ciesla, Laure, Cleri, Nikko J., Cohen, Seth H., Cole, Justin W., Cooke, Kevin C., Cooper, M. C., Cooray, Asantha R., Costantin, Luca, Cox, Isabella G., Croton, Darren, Daddi, Emanuele, Davé, Romeel, de la Vega, Alexander, Dekel, Avishai, Elbaz, David, Estrada-Carpenter, Vicente, Faber, Sandra M., Fernández, Vital, Finkelstein, Keely D., Freundlich, Jonathan, Fujimoto, Seiji, García-Argumánez, Ángela, Gardner, Jonathan P., Gawiser, Eric, Gómez-Guijarro, Carlos, Guo, Yuchen, Hamblin, Kurt, Hamilton, Timothy S., Hathi, Nimish P., Holwerda, Benne W., Hirschmann, Michaela, Hutchison, Taylor A., Jaskot, Anne E., Jha, Saurabh W., Jogee, Shardha, Juneau, Stéphanie, Jung, Intae, Kassin, Susan A., Bail, Aurélien Le, Leung, Gene C. K., Lucas, Ray A., Magnelli, Benjamin, Mantha, Kameswara Bharadwaj, Matharu, Jasleen, McGrath, Elizabeth J., McIntosh, Daniel H., Merlin, Emiliano, Mobasher, Bahram, Newman, Jeffrey A., Nicholls, David C., Pandya, Viraj, Rafelski, Marc, Ronayne, Kaila, Santini, Paola, Seillé, Lise-Marie, Shah, Ekta A., Shen, Lu, Simons, Raymond C., Snyder, Gregory F., Stanway, Elizabeth R., Straughn, Amber N., Teplitz, Harry I., Vanderhoof, Brittany N., Vega-Ferrero, Jesús, Wang, Weichen, Weiner, Benjamin J., Willmer, Christopher N. A., Wuyts, Stijn, Zavala, Jorge A., Finkelstein, Steven L. [0000-0001-8519-1130], Bagley, Micaela B. [0000-0002-9921-9218], Haro, Pablo Arrabal [0000-0002-7959-8783], Dickinson, Mark [0000-0001-5414-5131], Ferguson, Henry C. [0000-0001-7113-2738], Kartaltepe, Jeyhan S. [0000-0001-9187-3605], Papovich, Casey [0000-0001-7503-8482], Burgarella, Denis [0000-0002-4193-2539], Kocevski, Dale D. [0000-0002-8360-3880], Huertas-Company, Marc [0000-0002-1416-8483], Iyer, Kartheik G. [0000-0001-9298-3523], Koekemoer, Anton M. [0000-0002-6610-2048], Larson, Rebecca L. [0000-0003-2366-8858], Pérez-González, Pablo G. [0000-0003-4528-5639], Rose, Caitlin [0000-0002-8018-3219], Tacchella, Sandro [0000-0002-8224-4505], Wilkins, Stephen M. [0000-0003-3903-6935], Chworowsky, Katherine [0000-0003-4922-0613], Morales, Alexa M. [0000-0003-4965-0402], Somerville, Rachel S. [0000-0002-6748-6821], Yung, L. Y. Aaron [0000-0003-3466-035X], Fontana, Adriano [0000-0003-3820-2823], Giavalisco, Mauro [0000-0002-7831-8751], Grazian, Andrea [0000-0002-5688-0663], Grogin, Norman A. [0000-0001-9440-8872], Kewley, Lisa J. [0000-0001-8152-3943], Kirkpatrick, Allison [0000-0002-1306-1545], Kurczynski, Peter [0000-0002-8816-5146], Lotz, Jennifer M. [0000-0003-3130-5643], Pentericci, Laura [0000-0001-8940-6768], Pirzkal, Nor [0000-0003-3382-5941], Ravindranath, Swara [0000-0002-5269-6527], Ryan, Russell E., Jr. [0000-0003-0894-1588], Trump, Jonathan R. [0000-0002-1410-0470], Yang, Guang [0000-0001-8835-7722], Almaini, Omar [0000-0001-9328-3991], Amorín, Ricardo O. [0000-0001-5758-1000], Annunziatella, Marianna [0000-0002-8053-8040], Backhaus, Bren E. [0000-0001-8534-7502], Behroozi, Peter [0000-0002-2517-6446], Bell, Eric F. [0000-0002-5564-9873], Bhatawdekar, Rachana [0000-0003-0883-2226], Bisigello, Laura [0000-0003-0492-4924], Bromm, Volker [0000-0003-0212-2979], Buat, Véronique [0000-0003-3441-903X], Buitrago, Fernando [0000-0002-2861-9812], Calabrò, Antonello [0000-0003-2536-1614], Casey, Caitlin M. [0000-0002-0930-6466], Castellano, Marco [0000-0001-9875-8263], Chávez Ortiz, Óscar A. [0000-0003-2332-5505], Ciesla, Laure [0000-0003-0541-2891], Cleri, Nikko J. [0000-0001-7151-009X], Cohen, Seth H. [0000-0003-3329-1337], Cole, Justin W. [0000-0002-6348-1900], Cooke, Kevin C. [0000-0002-2200-9845], Cooper, M. C. [0000-0003-1371-6019], Cooray, Asantha R. [0000-0002-3892-0190], Costantin, Luca [0000-0001-6820-0015], Cox, Isabella G. [0000-0002-1803-794X], Croton, Darren [0000-0002-5009-512X], Daddi, Emanuele [0000-0002-3331-9590], Davé, Romeel [0000-0003-2842-9434], de la Vega, Alexander [0000-0002-6219-5558], Dekel, Avishai [0000-0003-4174-0374], Elbaz, David [0000-0002-7631-647X], Estrada-Carpenter, Vicente [0000-0001-8489-2349], Fernández, Vital [0000-0003-0531-5450], Finkelstein, Keely D. [0000-0003-0792-5877], Freundlich, Jonathan [0000-0002-5245-7796], Fujimoto, Seiji [0000-0001-7201-5066], García-Argumánez, Ángela [0000-0002-8365-5525], Gardner, Jonathan P. [0000-0003-2098-9568], Gawiser, Eric [0000-0003-1530-8713], Gómez-Guijarro, Carlos [0000-0002-4085-9165], Guo, Yuchen [0000-0002-4162-6523], Hamblin, Kurt [0000-0002-6292-4589], Hamilton, Timothy S. [0000-0002-9753-1769], Hathi, Nimish P. [0000-0001-6145-5090], Holwerda, Benne W. [0000-0002-4884-6756], Hirschmann, Michaela [0000-0002-3301-3321], Hutchison, Taylor A. [0000-0001-6251-4988], Jaskot, Anne E. [0000-0002-6790-5125], Jha, Saurabh W. [0000-0001-8738-6011], Jogee, Shardha [0000-0002-1590-0568], Juneau, Stéphanie [0000-0002-0000-2394], Jung, Intae [0000-0003-1187-4240], Kassin, Susan A. [0000-0002-3838-8093], Bail, Aurélien Le [0000-0002-9466-2763], Leung, Gene C. K. [0000-0002-9393-6507], Lucas, Ray A. [0000-0003-1581-7825], Magnelli, Benjamin [0000-0002-6777-6490], Matharu, Jasleen [0000-0002-7547-3385], McGrath, Elizabeth J. [0000-0001-8688-2443], Merlin, Emiliano [0000-0001-6870-8900], Newman, Jeffrey A. [0000-0001-8684-2222], Nicholls, David C. [0000-0003-0892-5203], Pandya, Viraj [0000-0002-2499-9205], Rafelski, Marc [0000-0002-9946-4731], Ronayne, Kaila [0000-0001-5749-5452], Santini, Paola [0000-0002-9334-8705], Seillé, Lise-Marie [0000-0001-7755-4755], Shah, Ekta A. [0000-0001-7811-9042], Shen, Lu [0000-0001-9495-7759], Simons, Raymond C. [0000-0002-6386-7299], Snyder, Gregory F. [0000-0002-4226-304X], Stanway, Elizabeth R. [0000-0002-8770-809X], Straughn, Amber N. [0000-0002-4772-7878], Teplitz, Harry I. [0000-0002-7064-5424], Vanderhoof, Brittany N. [0000-0002-8163-0172], Vega-Ferrero, Jesús [0000-0003-2338-5567], Wang, Weichen [0000-0002-9593-8274], Weiner, Benjamin J. [0000-0001-6065-7483], Willmer, Christopher N. A. [0000-0001-9262-9997], Wuyts, Stijn [0000-0003-3735-1931], and Apollo - University of Cambridge Repository

Subjects
Galaxies and Cosmology
Abstract

We report the discovery of a candidate galaxy with a photo-z of z ∼ 12 in the first epoch of the James Webb Space Telescope (JWST) Cosmic Evolution Early Release Science Survey. Following conservative selection criteria, we identify a source with a robust z phot = 11.8−0.2+0.3 (1σ uncertainty) with m F200W = 27.3 and ≳7σ detections in five filters. The source is not detected at λ < 1.4 μm in deep imaging from both Hubble Space Telescope (HST) and JWST and has faint ∼3σ detections in JWST F150W and HST F160W, which signal a Lyα break near the red edge of both filters, implying z ∼ 12. This object (Maisie’s Galaxy) exhibits F115W − F200W > 1.9 mag (2σ lower limit) with a blue continuum slope, resulting in 99.6% of the photo-z probability distribution function favoring z > 11. All data-quality images show no artifacts at the candidate’s position, and independent analyses consistently find a strong preference for z > 11. Its colors are inconsistent with Galactic stars, and it is resolved (r h = 340 ± 14 pc). Maisie’s Galaxy has log M */M ⊙ ∼ 8.5 and is highly star-forming (log sSFR ∼ −8.2 yr−1), with a blue rest-UV color (β ∼ −2.5) indicating little dust, though not extremely low metallicity. While the presence of this source is in tension with most predictions, it agrees with empirical extrapolations assuming UV luminosity functions that smoothly decline with increasing redshift. Should follow-up spectroscopy validate this redshift, our universe was already aglow with galaxies less than 400 Myr after the Big Bang.

Published
2022

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