Tootfinder

This https://arxiv.org/abs/2205.05903 has been replaced.
link: https://scholar.google.com/scholar?q=a

Entropies of the various components of the universe
In this work, we study the entropies of photons, dust (baryonic matter), dark matter, and dark energy in the context of cosmology. When these components expand freely with the universe, we calculate the entropy and specific entropy of each component from the perspective of statistics. Under specific assumptions and conditions, the entropies of these components can satisfy the second law of thermodynamics independently. Our calculations show that the specific entropy of matter cannot be a consta…

The Interstellar Medium in Dwarf Irregular Galaxies
Deidre A. Hunter, Bruce G. Elmegreen, Suzanne C. Madden
https://arxiv.org/abs/2402.17004 https://

The Interstellar Medium in Dwarf Irregular Galaxies
Dwarf irregulars (dIrrs) are among the most common type of galaxy in the Universe. They typically have gas-rich, low surface-brightness, metal-poor, and relatively-thick disks. Here we summarize the current state of our knowledge of the interstellar medium (ISM), including atomic, molecular and ionized gas, along with their dust properties and metals. We also discuss star formation feedback, gas accretion, and mergers with other dwarfs that connect the ISM to the circumgalactic and intergalacti…

The ALPINE-ALMA [CII] Survey: Dust emission effective radius up to 3 kpc in the Early Universe
F. Pozzi, F. Calura, Q. D'Amato, M. Gavarente, M. Bethermin, M. Boquien, V. Casasola, A. Cimatti, R. Cochrane, M. Dessauges-Zavadsky, A. Enia, F. Esposito, A. L. Faisst, R. Gilli, M. Ginolfi, R. Gobat, C. Gruppioni, C. C. Hayward, E. Ibar, A. M. Koekemoer, B. C. Lemaux, G. E. Magdis, J. Molina, M. Talia, L. Vallini, D. Vergani, G. Zamorani

The ALPINE-ALMA [CII] Survey: Dust emission effective radius up to 3 kpc in the Early Universe
Measurements of the size of dust continuum emission are an important tool for constraining the spatial extent of star formation and hence the build-up of stellar mass. Compact dust emission has generally been observed at Cosmic Noon (z~2-3). However, at earlier epochs, toward the end of the Reionization (z~4-6), only the sizes of a handful of IR-bright galaxies have been measured. In this work, we derive the dust emission sizes of main-sequence galaxies at z~5 from the ALPINE survey. We measure…

A non-singular universe out of Hayward black hole
Micha{\l} Bobula
https://arxiv.org/abs/2404.12243 https://arxiv.org/pdf/2404.12243<…

A non-singular universe out of Hayward black hole
We construct a (quantum mechanically) modified model for the Oppenheimer-Snyder collapse scenario where the exterior of the collapsing dust ball is a Hayward black hole spacetime and the interior is a dust Friedmann-Robertson-Walker cosmology. This interior cosmology is entirely determined by the junction conditions with the exterior black hole. It turns out to be non-singular, displaying a power-law contraction which precedes a de Sitter phase or, reversely, a power-law expansion followed by a…

The ALPINE-ALMA [CII] Survey: Dust emission effective radius up to 3 kpc in the Early Universe
F. Pozzi, F. Calura, Q. D'Amato, M. Gavarente, M. Bethermin, M. Boquien, V. Casasola, A. Cimatti, R. Cochrane, M. Dessauges-Zavadsky, A. Enia, F. Esposito, A. L. Faisst, R. Gilli, M. Ginolfi, R. Gobat, C. Gruppioni, C. C. Hayward, E. Ibar, A. M. Koekemoer, B. C. Lemaux, G. E. Magdis, J. Molina, M. Talia, L. Vallini, D. Vergani, G. Zamorani

The ALPINE-ALMA [CII] Survey: Dust emission effective radius up to 3 kpc in the Early Universe
Measurements of the size of dust continuum emission are an important tool for constraining the spatial extent of star formation and hence the build-up of stellar mass. Compact dust emission has generally been observed at Cosmic Noon (z~2-3). However, at earlier epochs, toward the end of the Reionization (z~4-6), only the sizes of a handful of IR-bright galaxies have been measured. In this work, we derive the dust emission sizes of main-sequence galaxies at z~5 from the ALPINE survey. We measure…

Compatibility of JWST results with exotic halos
Fabio Iocco, Luca Visinelli
https://arxiv.org/abs/2403.13068 https://arxiv.org/pdf/24…

Compatibility of JWST results with exotic halos
The James Webb Space Telescope (JWST) is unveiling astounding results about the first few hundred million years of life of the Universe, delivering images of galaxies at very high redshifts. Here, we develop a UV luminosity function model for high-redshift galaxies, considering parameters such as the stellar formation rate, dust extinction, and halo mass function. Calibration of this luminosity function model using UV luminosity data at redshifts z = 4-7 yields optimal parameter values. Testing…

Primordial dust universe in the Ho\v{r}ava-Lifshitz theory
G. Oliveira-Neto, A. Oliveira Castro J\'unior, G. A. Monerat
https://arxiv.org/abs/2403.05667

Primordial dust universe in the Hořava-Lifshitz theory
We apply quantum cosmology to investigate the early moments of a Friedmann-Lemaître-Robertson-Walker (FLRW) cosmological model, using Hořava-Lifshitz (HL) as the gravitational theory. The matter content of the model is a dust perfect fluid. We start studying the classical model. Then, we write the total Hamiltonian of the model, quantize it and find the appropriate Wheeler-DeWitt equation. In order to avoid factor ordering ambiguities, in the Wheeler-DeWitt equation, we introduce a canonical …

Dead or Alive? How Bursty Star Formation and Patchy Dust Can Cause Temporary Quiescence in High Redshift Galaxies
A. L. Faisst, T. Morishita
https://arxiv.org/abs/2402.13316

Dead or Alive? How Bursty Star Formation and Patchy Dust Can Cause Temporary Quiescence in High Redshift Galaxies
The recent discovery of a galaxy at z=7.3 with undetected optical emission lines and a blue UV to optical continuum ratio in JWST spectroscopy is surprising and needs to be explained physically. Here, we explore two possibilities that could cause such a seemingly quiescent 5e8 Msun galaxy in the early Universe: (i) stochastic variations in the star formation history (SFH) and (ii) the effect of spatially varying dust attenuation on the measured line and continuum emission properties. Both scena…

Machine Learning based Pointing Models for Radio/Sub-millimeter Telescopes
Bendik Nyheim, Signe Riemer-S{\o}rensen, Rodrigo Parra, Claudia Cicone
https://arxiv.org/abs/2402.08589 …

Machine Learning based Pointing Models for Radio/Sub-millimeter Telescopes
Radio, sub-millimiter and millimeter ground-based telescopes are powerful instruments for studying the gas and dust-rich regions of the Universe that are invisible at optical wavelengths, but the pointing accuracy is crucial for obtaining high-quality data. Pointing errors are small deviations of the telescope's orientation from its desired direction. The telescopes use linear regression pointing models to correct for these errors, taking into account various factors such as weather conditions,…

Dead or Alive? How Bursty Star Formation and Patchy Dust Can Cause Temporary Quiescence in High Redshift Galaxies
A. L. Faisst, T. Morishita
https://arxiv.org/abs/2402.13316

Dead or Alive? How Bursty Star Formation and Patchy Dust Can Cause Temporary Quiescence in High Redshift Galaxies
The recent discovery of a galaxy at z=7.3 with undetected optical emission lines and a blue UV to optical continuum ratio in JWST spectroscopy is surprising and needs to be explained physically. Here, we explore two possibilities that could cause such a seemingly quiescent 5e8 Msun galaxy in the early Universe: (i) stochastic variations in the star formation history (SFH) and (ii) the effect of spatially varying dust attenuation on the measured line and continuum emission properties. Both scena…

This https://arxiv.org/abs/2310.17048 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Probing 3D magnetic fields using thermal dust polarization and grain alignment theory
Magnetic fields are ubiquitous in the universe and are thought to play an important role in various astrophysical processes. Polarization of thermal dust emission from dust grains aligned with the magnetic field is widely used to measure the two-dimensional magnetic field projected onto the plane of the sky (POS), but the component along the line of sight (LOS) is not yet reliably constrained with dust polarization. Here, we introduce a new method to infer three-dimensional (3D) magnetic fields…

Atacama Large Aperture Submillimeter Telescope (AtLAST) Science: Surveying the distant Universe
Eelco van Kampen, Tom Bakx, Carlos De Breuck, Chian-Chou Chen, Helmut Dannerbauer, Benjamin Magnelli, Francisco Miguel Montenegro-Montes, Teppei Okumura, Sy-Yun Pu, Matus Rybak, Amelie Saintonge, Claudia Cicone, Evanthia Hatziminaoglou, Juliette Hilhorst, Pamela Klaassen, Minju Lee, Christopher C. Lovell, Andreas Lundgren, Luca Di Mascolo, Tony Mroczkowski, Laura Sommovigo, Mark Booth, Marti…

Atacama Large Aperture Submillimeter Telescope (AtLAST) Science: Surveying the distant Universe
During the most active period of star formation in galaxies, which occurs in the redshift range 1

Birth of Rapidly Spinning, Overmassive Black Holes in the Early Universe
Kohei Inayoshi, Kohei Ichikawa
https://arxiv.org/abs/2402.14706 https://

Birth of Rapidly Spinning, Overmassive Black Holes in the Early Universe
The James Webb Space Telescope (JWST) has unveiled numerous massive black holes (BHs) in faint, broad-line active galactic nuclei (AGNs). The discovery highlights the presence of dust-reddened AGN populations, referred to as little red dots (LRDs), more abundant than X-ray selected AGNs, which are less influenced by obscuration. This finding indicates that the cosmic growth rate of BHs within this population does not decrease but rather increases at higher redshifts beyond $z\sim 6$. The BH acc…

Birth of Rapidly Spinning, Overmassive Black Holes in the Early Universe
Kohei Inayoshi, Kohei Ichikawa
https://arxiv.org/abs/2402.14706 https://

Birth of Rapidly Spinning, Overmassive Black Holes in the Early Universe
The James Webb Space Telescope (JWST) has unveiled numerous massive black holes (BHs) in faint, broad-line active galactic nuclei (AGNs). The discovery highlights the presence of dust-reddened AGN populations, referred to as little red dots (LRDs), more abundant than X-ray selected AGNs, which are less influenced by obscuration. This finding indicates that the cosmic growth rate of BHs within this population does not decrease but rather increases at higher redshifts beyond $z\sim 6$. The BH acc…

This https://arxiv.org/abs/2308.00342 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Reconstruction of aether scalar tensor theory for various cosmological scenarios
In this paper, we present several explicit reconstructions for {the aether scalar tensor (AeST) theory} derived from the background of Friedmann-Lema$\hat{\textı}$tre-Robertson-Walker cosmological evolution. It is shown that the Einstein-Hilbert Lagrangian with a positive cosmological constant is the only Lagrangian capable of accurately replicating the exact expansion history of the $Λ$ cold dark matter ($Λ$CDM) universe filled solely with dust-like matter. However, the $Λ$CDM-era can be p…

This https://arxiv.org/abs/2404.03576 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The Rise of Faint, Red AGN at $z>4$: A Sample of Little Red Dots in the JWST Extragalactic Legacy Fields
We present a sample of 341 "little red dots" (LRDs) spanning the redshift range $z\sim2-11$ using data from the CEERS, PRIMER, JADES, UNCOVER and NGDEEP surveys. These sources are likely heavily-reddened AGN that trace a previously-hidden phase of dust-obscured black hole growth in the early Universe. Unlike past use of color indices to identify LRDs, we employ continuum slope fitting using shifting bandpasses to sample the same rest-frame emission blueward and redward of the Balmer break. This…

JWST PRIMER: A new multi-field determination of the evolving galaxy UV luminosity function at redshifts $\mathbf{z \simeq 9-15}$
C. T. Donnan, R. J. McLure, J. S. Dunlop, D. J. McLeod, D. Magee, K. Z. Arellano-C\'ordova, L. Barrufet, R. Begley, R. A. A. Bowler, A. C. Carnall, F. Cullen, R. S. Ellis, A. Fontana, G. D. Illingworth, N. A. Grogin, M. L. Hamadouche, A. M. Koekemoer, Feng-Yuan Liu, C. Mason, P. Santini, T. M. Stanton
https://arxiv.org/abs/2403.03171 https://arxiv.org/pdf/2403.03171
arXiv:2403.03171v1 Announce Type: new
Abstract: We present a new determination of the evolving galaxy UV luminosity function (LF) over the redshift range $8.5<15.5$ using a combination of several major Cycle-1 JWST imaging programmes - PRIMER, JADES and NGDEEP. This multi-field approach yields a total of $\simeq370$ sq. arcmin of JWST/NIRCam imaging, reaching (5-$\sigma$) depths of $\simeq30$ AB mag in the deepest regions. We select a sample of 2548 galaxies with a significant probability of lying at high redshift ($p(z>8.5)>0.05$) to undertake a statistical calculation of the evolving UV LF. Our new measurements span $\simeq4$ magnitudes in UV luminosity at $z=9-12.5$, placing new constraints on both the shape and evolution of the LF at early times. We fit our observational data-points with a double-power law (DPL) function and explore the evolution of the DPL parameters. Our UV LF measurements yield a new estimate of the early evolution of cosmic star-formation rate density ($\rho_{\rm{SFR}}$) which confirms the gradual, log-linear decline deduced from early JWST studies, at least out to $z \simeq 12$. Finally we show that the observed early evolution of the galaxy UV LF (and $\rho_{\rm{SFR}}$) can be reproduced in a ${\rm \Lambda}$CDM Universe, with no change in dust properties or star-formation efficiency required out to $z \simeq 12$. Instead, we show that a progressive trend towards younger stellar population ages can reproduce the observations, and we show that the typical ages required at $z \simeq$ 8, 9, 10, and 11 all converge on a time $\simeq 380-330$ Myr after the Big Bang, indicative of a rapid emergence of early galaxies at $z \simeq 12 - 13$. This is consistent with the first indications of a steeper drop-off in the galaxy population we find beyond $z \simeq 13$, possibly reflecting the rapid evolution of the halo mass function at earlier times.

Physical properties of extreme emission-line galaxies at $z\sim 4-9$ from the JWST CEERS survey
M. Llerena, R. Amor\'in, L. Pentericci, P. Arrabal Haro, B. E. Backhaus, M. B. Bagley, A. Calabr\`o, N. J. Cleri, K. Davis, M. Dickinson, S. L. Finkelstein, E. Gawiser, N. A. Grogin, N. P. Hathi, M. Hirschmann, J. S. Kartaltepe, A. M. Koekemoer, E. J. McGrath, B. Mobasher, L. Napolitano, C. Papovich, N. Pirzkal, J. R. Trump, S. M. Wilkins, L. Y. A. Yung

Physical properties of extreme emission-line galaxies at $z\sim 4-9$ from the JWST CEERS survey
Extreme emission line galaxies (EELGs) are typically characterized by high equivalent widths (EWs) which are driven by elevated specific star formation rates (sSFR) in low-mass galaxies with subsolar metallicities and little dust. Such extreme systems are rare in the local universe, but the number density of EELGs increases with redshift. Such starburst galaxies are currently presumed to be the main drivers of hydrogen reionization over 5.5

The Rise of Faint, Red AGN at $z>4$: A Sample of Little Red Dots in the JWST Extragalactic Legacy Fields
Dale D. Kocevski, Steven L. Finkelstein, Guillermo Barro, Anthony J. Taylor, Antonello Calabr\`o, Brivael Laloux, Johannes Buchner, Jonathan R. Trump, Gene C. K. Leung, Guang Yang, Mark Dickinson, Pablo G. P\'erez-Gonz\'alez, Fabio Pacucci, Kohei Inayoshi, Rachel S. Somerville, Elizabeth J. McGrath, Hollis B. Akins, Pablo Arrabal Haro, Micaela B. Bagley, Rebecca A. A. Bow…

The Rise of Faint, Red AGN at $z>4$: A Sample of Little Red Dots in the JWST Extragalactic Legacy Fields
We present a sample of 341 "little red dots" (LRDs) spanning the redshift range $z\sim2-11$ using data from the CEERS, PRIMER, JADES, UNCOVER and NGDEEP surveys. These sources are likely heavily-reddened AGN that trace a previously-hidden phase of dust-obscured black hole growth in the early Universe. Unlike past use of color indices to identify LRDs, we employ continuum slope fitting using shifting bandpasses to sample the same rest-frame emission blueward and redward of the Balmer break. This…