Zobrazeno 1 - 10
of 39 579
pro vyhledávání: '"A. Loeb"'
Autor:
De, Kishalay, MacLeod, Morgan, Jencson, Jacob E., Lovegrove, Elizabeth, Antoni, Andrea, Kara, Erin, Kasliwal, Mansi M., Lau, Ryan M., Loeb, Abraham, Masterson, Megan, Meisner, Aaron M., Panagiotou, Christos, Quataert, Eliot, Simcoe, Robert
Stellar mass black holes are formed from the terminal collapse of massive stars if the ensuing neutrino shock is unable to eject the stellar envelope. Direct observations of black hole formation remain inconclusive. We report observations of M31-2014
Externí odkaz:
http://arxiv.org/abs/2410.14778
Generative AI, particularly Language Models (LMs), has the potential to transform real-world domains with societal impact, particularly where access to experts is limited. For example, in education, training novice educators with expert guidance is i
Externí odkaz:
http://arxiv.org/abs/2410.03017
Autor:
MacLeod, Morgan, Blunt, Sarah, De Rosa, Robert J., Dupree, Andrea K., Granzer, Thomas, Harper, Graham M., Huang, Caroline D., Leiner, Emily M., Loeb, Abraham, Nielsen, Eric L., Strassmeier, Klaus G., Wang, Jason J., Weber, Michael
We examine a century of radial velocity, visual magnitude, and astrometric observations of the nearest red supergiant, Betelgeuse, in order to reexamine the century-old assertion that Betelgeuse might be a spectroscopic binary. These data reveal Bete
Externí odkaz:
http://arxiv.org/abs/2409.11332
Autor:
Loeb, Abraham
Publikováno v:
ApJL, 975, L15 (2024)
The Schwarzschild radii of primordial black holes (PBHs) in the mass range of 6x10^{14}g to 4x10^{19}g match the sizes of nuclei to atoms. I discuss the resulting quantum-mechanical suppression in the accretion of matter by PBHs in dense astrophysica
Externí odkaz:
http://arxiv.org/abs/2409.09081
Autor:
Padmanabhan, Hamsa, Loeb, Abraham
We use the inferred evolution of Lyman-$\alpha$ luminosities of galaxies in the redshift range of $z \sim 9-16$ from the $James \ Webb \ Space \ Telescope$ (JWST) data to predict the power spectrum of Loeb-Rybicki haloes formed by scattered Lyman-$\a
Externí odkaz:
http://arxiv.org/abs/2408.16820
Autor:
Loeb, Abraham
Publikováno v:
Research Notes of the AAS, Volume 8, Issue 8, id.211 (2024)
Current cosmological constraints allow primordial black holes (PBHs) to constitute dark matter in the mass range of $10^{18}$-$10^{22}$g. We show that a major portion of this logarithmic window can be ruled-out based on the Solar System ephemeris, gi
Externí odkaz:
http://arxiv.org/abs/2408.10799
Autor:
Loeb, Abraham
We show that black holes can be made of light by adding gravity to the discussion of Alvarez-Dominguez et al., arXiv:2405.02389 [PRL 130, 041401 (2024)].
Comment: Comment on arXiv:2405.02389 [PRL 130, 041401 (2024)], 2 pages; submitted for publi
Comment: Comment on arXiv:2405.02389 [PRL 130, 041401 (2024)], 2 pages; submitted for publi
Externí odkaz:
http://arxiv.org/abs/2408.06714
Autor:
Kakharov, Shokhruz, Loeb, Abraham
The first interstellar objects, such as 'Oumuamua, Borisov, and IM1, were discovered over the past decade. We follow the trajectories of known interstellar objects in the gravitational potential of the Milky Way galaxy to constrain their possible ori
Externí odkaz:
http://arxiv.org/abs/2408.02739
Autor:
Pandya, Viraj, Loeb, Abraham, McGrath, Elizabeth J., Barro, Guillermo, Finkelstein, Steven L., Ferguson, Henry C., Grogin, Norman A., Kartaltepe, Jeyhan S., Koekemoer, Anton M., Papovich, Casey, Pirzkal, Nor, Yung, L. Y. Aaron
The majority of low-mass ($\log_{10} M_*/M_{\odot}=9-10$) galaxies at high redshift ($z>1$) appear elongated in projection. We use JWST-CEERS observations to explore the role of gravitational lensing in this puzzle. The typical galaxy-galaxy lensing
Externí odkaz:
http://arxiv.org/abs/2407.17552
Autor:
Loeb, Abraham
Publikováno v:
RNAAS, 8, 182, 2024; https://iopscience.iop.org/article/10.3847/2515-5172/ad614c
Recently, a new population of compact, high-redshift (z>7) galaxies appeared as little red dots (LRDs) in deep JWST observations. The latest spectroscopic data indicates that these galaxies contain an evolved stellar population, reflecting an early e
Externí odkaz:
http://arxiv.org/abs/2407.12965