Zobrazeno 1 - 10
of 39 368
pro vyhledávání: '"Loeb, A."'
Autor:
Kakharov, Shokhruz, Loeb, Abraham
Context. The first interstellar objects, such as 'Oumuamua, Borisov and IM1, were discovered over the past decade. Aims. We follow the trajectories of known interstellar objects in the gravitational potential of the Milky Way galaxy to constrain thei
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
Autor:
Medvedev, Mikhail V., Loeb, Abraham
Dark matter particles were suggested to have an electric charge smaller than the elementary charge unit $e$. The behavior of such a medium is similar to a collisionless plasma. In this paper, we set new stringent constraints on the charge and mass of
Externí odkaz:
http://arxiv.org/abs/2406.15750
Autor:
Loeb, Abraham
Recently, Pulsar Timing Arrays (PTAs) reported a signal at nanohertz frequencies consistent with a stochastic gravitational wave background. Here, I show that the Brownian motion of the Sun as a result of its random gravitational interactions with th
Externí odkaz:
http://arxiv.org/abs/2405.05410
Autor:
Padmanabhan, Hamsa, Loeb, Abraham
The $James \ Webb \ Space \ Telescope \ (JWST)$ recently reported a large population of UV luminous galaxies at high redshifts, $ z > 10$, as well as Lyman-$\alpha$ emitting (LAE) galaxies out to $z \sim 11$. We use the observed UV luminosities along
Externí odkaz:
http://arxiv.org/abs/2404.18998
Autor:
Hertzberg, Mark P., Loeb, Abraham
We analyze consequences of trying to replace dark matter and dark energy with models of stochastic spacetime. In particular, we analyze the model put forth by Ref. [1], in which it is claimed that ``post-quantum classical gravity" (PQCG), a stochasti
Externí odkaz:
http://arxiv.org/abs/2404.13037
Publikováno v:
Res. Notes AAS, 2024, 8 105
JWST is discovering a large population of $z>4$ supermassive black holes (SMBHs) that are overmassive with respect to the stellar content of their hosts. A previous study developed a physical model to interpret this overmassive population as the resu
Externí odkaz:
http://arxiv.org/abs/2404.11643
Autor:
Hu, Betty X., Loeb, Avi
The strong tidal force in a supermassive black hole's (SMBH) vicinity, coupled with a higher stellar density at the center of a galaxy, make it an ideal location to study the interaction between stars and black holes. Two stars moving near the SMBH c
Externí odkaz:
http://arxiv.org/abs/2404.07255
Autor:
Loeb, Abraham
In a recent preprint, Fernando et al. (2024) used public data from infrasound stations to constrain the localization of the fireball of the CNEOS 2014-01-08 (IM1) bolide. The analysis inferred a 90-percent-confidence ellipse with semi-minor and semi-
Externí odkaz:
http://arxiv.org/abs/2403.07696