Zobrazeno 1 - 10
of 177
pro vyhledávání: '"Daniel A. Whalen"'
Publikováno v:
The Astronomical Journal, Vol 167, Iss 6, p 251 (2024)
Recent calculations indicate that radio emission from quasars at z ∼ 6–7 could be detected at much earlier stages of evolution, at z ∼ 14–15, by the Next-Generation Very Large Array (ngVLA) and the Square Kilometer Array (SKA). However, the J
Externí odkaz:
https://doaj.org/article/a1996879ac78434ea56abc02823c4e51
Autor:
Ke-Jung Chen, Ching-Yao Tang, Daniel J. Whalen, Meng-Yuan Ho, Sung-Han Tsai, Po-Sheng Ou, Masaomi Ono
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 1, p 91 (2024)
Massive Population III stars can die as energetic supernovae that enrich the early Universe with metals and determine the properties of the first galaxies. With masses of about 10 ^9 M _⊙ at z ≳ 10, these galaxies are believed to be the ancestors
Externí odkaz:
https://doaj.org/article/8bc1b7fcc56449f682dccb458e1d7f54
Publikováno v:
The Astrophysical Journal, Vol 960, Iss 1, p 59 (2023)
Supermassive primordial stars with masses exceeding ∼10 ^5 M _⊙ that form in atomically cooled halos are the leading candidates for the origin of high-redshift quasars at z > 6. Recent numerical simulations, however, find that multiple accretion
Externí odkaz:
https://doaj.org/article/5e9b8a02f5e1497dab93c05b3b8cabf4
Publikováno v:
The Astrophysical Journal, Vol 956, Iss 2, p 133 (2023)
The recent discovery of a 4 × 10 ^7 M _⊙ black hole (BH) in UHZ1 at z = 10.3, just 450 Myr after the Big Bang, suggests that the seeds of the first quasars may have been direct-collapse BHs from the collapse of supermassive primordial stars at z
Externí odkaz:
https://doaj.org/article/72d2654d9f904d58b1218b5397afbf97
Publikováno v:
The Astrophysical Journal, Vol 955, Iss 1, p 39 (2023)
Stars with masses of 80–130 M _⊙ can encounter pulsational pair-instability at the end of their lives, which triggers consecutive episodes of explosive burning that eject multiple massive shells. Collisions between these shells produce bright tra
Externí odkaz:
https://doaj.org/article/0345ce7daf994813911b28d11c30a529
Supermassive stars forming at $z \sim$ 15 - 20 are one of the leading contenders for the origin of the first quasars, over 200 of which have now been discovered at $z >$ 6. These stars likely form in pristine, atomically cooled haloes immersed in str
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::614a7531a4060da95229515f59fb06d1
Autor:
Daniel A. Whalen, Steven J. Duranceau
Publikováno v:
Environmental technology.
Seawater was investigated as an alternative regenerant source to conventional salt-imported brine solutions in an anion exchange process treating surficial Florida coastal groundwater for the removal of sulfate and organics. Bench-scale column testin
Primordial supermassive stars (SMSs) formed in atomic-cooling halos at z ~ 15 - 20 are leading candidates for the seeds of the first quasars. Past numerical studies of the evolution of SMSs have typically assumed constant accretion rates rather than
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d4214ec010f58698043b63fe8452590
http://arxiv.org/abs/2102.08963
http://arxiv.org/abs/2102.08963
Autor:
Daniel J. Whalen
Publikováno v:
Acta Polytechnica, Vol 53, Iss A (2013)
Pop III stars are the key to the character of primeval galaxies, the first heavy elements, the onset of cosmological reionization, and the seeds of supermassive black holes. Unfortunately, in spite of their increasing sophistication, numerical models
Externí odkaz:
https://doaj.org/article/f7f794d7c15b4e17a0fa602e0aea0ada
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
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Direct-collapse black holes (DCBHs) forming at $z \sim$ 20 are currently the leading candidates for the seeds of the first quasars, over 200 of which have now been found at $z >$ 6. Recent studies suggest that DCBHs could be detected in the near infr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7c082f234e23aafbb02586bf3af748d