Zobrazeno 1 - 10
of 208
pro vyhledávání: '"Muñoz, Julian B."'
Analyses of the cosmic 21-cm signal are hampered by astrophysical foregrounds that are far stronger than the signal itself. These foregrounds, typically confined to a wedge-shaped region in Fourier space, often necessitate the removal of a vast major
Externí odkaz:
http://arxiv.org/abs/2407.21097
Observations of the 21-cm signal are opening a window to the cosmic-dawn epoch, when the first stars formed. These observations are usually interpreted with semi-numerical or hydrodynamical simulations, which are often computationally intensive and i
Externí odkaz:
http://arxiv.org/abs/2407.18294
We study the cosmological impact of warm, dark-sector relic particles produced as Hawking radiation in a primordial-black-hole-dominated universe before big bang nucleosynthesis. If those dark-sector particles are stable, they would survive to the pr
Externí odkaz:
http://arxiv.org/abs/2406.08535
Autor:
Rose, Jonah C., Torrey, Paul, Villaescusa-Navarro, Francisco, Lisanti, Mariangela, Nguyen, Tri, Roy, Sandip, Kollmann, Kassidy E., Vogelsberger, Mark, Cyr-Racine, Francis-Yan, Medvedev, Mikhail V., Genel, Shy, Anglés-Alcázar, Daniel, Kallivayalil, Nitya, Wang, Bonny Y., Costanza, Belén, O'Neil, Stephanie, Roche, Cian, Karmakar, Soumyodipta, Garcia, Alex M., Low, Ryan, Lin, Shurui, Mostow, Olivia, Cruz, Akaxia, Caputo, Andrea, Farahi, Arya, Muñoz, Julian B., Necib, Lina, Teyssier, Romain, Dalcanton, Julianne J., Spergel, David
We introduce the DREAMS project, an innovative approach to understanding the astrophysical implications of alternative dark matter models and their effects on galaxy formation and evolution. The DREAMS project will ultimately comprise thousands of co
Externí odkaz:
http://arxiv.org/abs/2405.00766
Autor:
Verwohlt, Jo, Mason, Charlotte A., Muñoz, Julian B., Cyr-Racine, Francis-Yan, Vogelsberger, Mark, Zavala, Jesús
The formation redshift and abundance of the first stars and galaxies is highly sensitive to the build up of low mass dark matter halos as well as astrophysical feedback effects which modulate star formation in these low mass halos. The 21-cm signal a
Externí odkaz:
http://arxiv.org/abs/2404.17640
New James Webb Space Telescope (JWST) observations are revealing the first galaxies to be prolific producers of ionizing photons, which we argue gives rise to a tension between different probes of reionization. For hydrogen reionization to proceed th
Externí odkaz:
http://arxiv.org/abs/2404.07250
The 21-cm signal provides a novel avenue to measure the thermal state of the universe during cosmic dawn and reionization (redshifts $z\sim 5-30$), and thus to probe energy injection from decaying or annihilating dark matter (DM). These DM processes
Externí odkaz:
http://arxiv.org/abs/2312.11608
The first stars are expected to form through molecular-hydrogen (H$_2$) cooling, a channel that is especially sensitive to the thermal and ionization state of gas, and can thus act as a probe of exotic energy injection from decaying or annihilating d
Externí odkaz:
http://arxiv.org/abs/2308.12992
The high-redshift galaxy UV luminosity function (UVLF) has become essential for understanding the formation and evolution of the first galaxies. Yet, UVLFs only measure galaxy abundances, giving rise to a degeneracy between the mean galaxy luminosity
Externí odkaz:
http://arxiv.org/abs/2306.09403
The early-science observations made by the James Webb Space Telescope (JWST) have revealed an excess of ultra-massive galaxy candidates that appear to challenge the standard cosmological model ($\Lambda$CDM). Here, we argue that any modifications to
Externí odkaz:
http://arxiv.org/abs/2305.07049