RAS_WEB (Page 31)

Constraining on the non-standard cosmological models combining the observations of high-redshift quasars and BAO Ziqiang Liu, Tonghua Liu, Xinyi Zhong, Yifei Xu, Xiaogang Zheng arXiv:2404.10794v1 Announce Type: new Abstract: In this work, we studied four types of cosmological models with different mechanisms driving the accelerated expansion of the universe, include Braneworld models, Chaplygin Gas models, Emergent Dark Energy models, and cosmological torsion models. Considering that the dynamics of these models at low redshifts are very similar and difficult to distinguish, we used the latest and largest UV and X-ray measurements of quasars (QSOs) observations covering the range of redshift $0.009arXiv:2404.10794v1 Announce Type: new Abstract: InRead More →

The Co-Evolution Between Galaxies and Dark Matter Halos Aldo Rodriguez-Puebla arXiv:2404.10801v1 Announce Type: new Abstract: The current cosmological paradigm asserts that dark matter halos provide the gravitational scaffolding for galaxy formation through a combination of hierarchical structure formation and non-linear local (g)astrophysical processes. This close relationship, known as the galaxy-halo connection, suggests that the growth and assembly of dark matter halos impact the properties of galaxies. While the stellar mass of galaxies correlates strongly with the mass of their halos, it is important to note that the galaxy-halo connection encompasses a broader distribution of galaxy and halo properties. This distribution can be constrained using dataRead More →

Vorticity and magnetic dynamo from subsonic expansion waves II: Dependence on magnetic Prandtl number, forcing scale, cooling time Albert Elias-L’opez, Fabio del Sordo, Daniele Vigan`o arXiv:2404.10804v1 Announce Type: new Abstract: The amplification of astrophysical magnetic fields takes place via dynamo instability in turbulent environments. The presence of vorticity is crucial for the dynamo to happen. However, the role of vorticity is not yet fully understood. This work is an extension of previous research on the effect of an irrotational subsonic forcing on a magnetized medium in the presence of rotation or a differential velocity profile, aimed at exploring a wider parameter space in terms ofRead More →

New AGN diagnostic diagrams based on the [OIII]$lambda 4363$ auroral line G. Mazzolari, H. "Ubler, R. Maiolino, X. Ji, K. Nakajima, A. Feltre, J. Scholtz, F. D’Eugenio, M. Curti, M. Mignoli, A. Marconi arXiv:2404.10811v1 Announce Type: new Abstract: The James Webb Space Telescope (JWST) is revolutionizing our understanding of black holes formation and growth in the early Universe. However, JWST has also revealed that some of the classical diagnostics, such as the BPT diagrams and X-ray emission, often fail to identify narrow line TypeII active galactic nuclei (AGN) at high redshift. Here we present three new rest-frame optical diagnostic diagrams leveraging the [OIII]$lambda4363$ auroral line,Read More →

JWST Photometry of Globular Clusters in Abell 2744. II: luminosity and color distributions William E. Harris, Marta Reina-Campos arXiv:2404.10813v1 Announce Type: new Abstract: Deep JWST imaging of the giant galaxy cluster Abell 2744, at redshift $z=0.308$, is used to explore the features of its rich population of globular clusters (GCs), building on our initial survey of the system (Harris & Reina-Campos 2023). We use the photometry of more than $10,000$ GCs over a three-magnitude range to construct the GC luminosity function (GCLF) and color distribution (CDF). These results now specifically account for photometric incompleteness as a function of location relative to the five giant galaxiesRead More →

FRESCO: The Paschen-$alpha$ Star Forming Sequence at Cosmic Noon Chloe Neufeld, Pieter van Dokkum, Yasmeen Asali, Alba Covelo-Paz, Joel Leja, Jamie Lin, Jorryt Matthee, Pascal A. Oesch, Naveen A. Reddy, Irene Shivaei, Katherine E. Whitaker, Stijn Wuyts, Gabriel Brammer, Danilo Marchesini, Michael V. Maseda, Rohan P. Naidu, Erica J. Nelson, Anna Velichko, Andrea Weibel, Mengyuan Xiao arXiv:2404.10816v1 Announce Type: new Abstract: We present results from the JWST First Reionization Epoch Spectroscopically Complete Observations survey (FRESCO) on the star forming sequence of galaxies at $1.09.5 M_odot$ that are lower than found in many earlier studies by up to 0.6 dex, but in good agreement with recentRead More →

Spectroscopic characterisation of gravitationally lensed stars at high redshifts Emma Lundqvist, Erik Zackrisson, Calum Hawcroft, Anish M. Amarsi, Brian Welch arXiv:2404.10817v1 Announce Type: new Abstract: Deep imaging of galaxy cluster fields have in recent years revealed tens of candidates for gravitationally lensed stars at redshifts $zapprox$ 1-6, and future searches are expected to reveal highly magnified stars from even earlier epochs. Multi-band photometric observations may be used to constrain the redshift, effective temperature $T_mathrm{eff}$ and dust attenuation along the line of sight to such objects. When combined with an estimate of the likely magnification, these quantities may be converted into a constraint on the stellarRead More →

The first degree-scale starlight-polarization-based tomography map of the magnetized interstellar medium V. Pelgrims, N. Mandarakas, R. Skalidis, K. Tassis, G. V. Panopoulou, V. Pavlidou, D. Blinov, S. Kiehlmann, S. E. Clark, B. S. Hensley, S. Romanopoulos, A. Basyrov, H. K. Eriksen, M. Falalaki, T. Ghosh, E. Gjerl{o}w, J. A. Kypriotakis, S. Maharana, A. Papadaki, T. J. Pearson, S. B. Potter, A. N. Ramaprakash, A. C. S. Readhead, I. K. Wehus arXiv:2404.10821v1 Announce Type: new Abstract: We present the first degree-scale tomography map of the dusty magnetized interstellar medium (ISM) from stellar polarimetry and distance measurements. We used the RoboPol polarimeter at Skinakas Observatory to conductRead More →

The CAVITY project. The spatially resolved stellar population properties of galaxies in voids Ana M. Conrado, Rosa M. Gonz’alez Delgado, Rub’en Garc’ia-Benito, Isabel P’erez, Simon Verley, Tom’as Ruiz-Lara, Laura S’anchez-Menguiano, Salvador Duarte Puertas, Andoni Jim’enez, Jes’us Dom’inguez-G’omez, Daniel Espada, Mar’ia Argudo-Fern’andez, Manuel Alc’azar-Laynez, Guillermo Bl’azquez-Calero, Bahar Bidaran, Almudena Zurita, Reynier Peletier, Gloria Torres-R’ios, Estrella Florido, M’onica Rodr’iguez Mart’inez, Ignacio del Moral-Castro, Rien van de Weygaert, Jes’us Falc’on-Barroso, Alejandra Z. Lugo-Aranda, Sebasti’an F. S’anchez, Thijs van der Hulst, H’el`ene M. Courtois, Anna Ferr’e-Mateu, Patricia S’anchez-Bl’azquez, Javier Rom’an, Jes’us Aceituno arXiv:2404.10823v1 Announce Type: new Abstract: The Universe is shaped as a web-like structure, formed by clusters, filaments,Read More →

Probing the optical depth with galaxy number counts Selim C. Hotinli, Gilbert P. Holder arXiv:2404.10825v1 Announce Type: new Abstract: We study the prospects for measuring the cosmological distribution and abundance of ionized electrons in the intergalactic medium using galaxy surveys. Optical light from distant galaxies is subject to Thomson screening by intervening electrons which distorts the observed galaxy number density, similar to the effect of weak gravitational lensing magnification. We construct an estimator for the optical-depth fluctuations from the statistical anisotropies of galaxy number counts induced by the spatially-varying optical-depth field. We find near-future galaxy surveys can detect this signal at signal-to-noise above $sim10$ dependingRead More →

The link between Athor and EL meteorites does not constrain the timing of the giant planet instability Andre Izidoro, Rogerio Deienno, Sean N. Raymond, Matthew S. Clement arXiv:2404.10828v1 Announce Type: new Abstract: The asteroid Athor, residing today in the inner main asteroid belt, has been recently associated as the source of EL enstatite meteorites to Earth. It has been argued that Athor formed in the terrestrial region — as indicated by similarity in isotopic compositions between Earth and EL meteorites — and was implanted in the belt $gtrsim$60 Myr after the formation of the solar system. A recently published study modelling Athor’s implantation in theRead More →

Implantation of asteroids from the terrestrial planet region: The effect of the timing of the giant planet instability Andre Izidoro, Rogerio Deienno, Sean N. Raymond, Matthew S. Clement arXiv:2404.10831v1 Announce Type: new Abstract: The dynamical architecture and compositional diversity of the asteroid belt strongly constrain planet formation models. Recent Solar System formation models have shown that the asteroid belt may have been born empty and later filled with objects from the inner ($5 au) of the solar system. In this work, we focus on the implantation of inner solar system planetesimals into the asteroid belt – envisioned to represent S and/or E- type asteroids –Read More →

Stripped-envelope supernova light curves argue for central engine activity ‘Osmar Rodr’iguez, Ehud Nakar, Dan Maoz arXiv:2404.10846v1 Announce Type: new Abstract: The luminosity of “stripped-envelope supernovae”, a common type of stellar explosions, has been generally thought to be driven by the radioactive decay of the nickel synthesized in the explosion and carried in its ejecta. Additional possible energy sources have been previously suggested, but these claims have been statistically inconclusive or model-dependent. Here, we analyse the energy budget of a sample of 54 well-observed stripped-envelope supernovae of all sub-types, and present statistically significant, largely model-independent, observational evidence for a non-radioactive power source in most of themRead More →

The S-PLUS Fornax Project (S+FP): SExtractor detection and measurement of nearby galaxies in large photometric surveys R. F. Haack, A. V. Smith Castelli, C. Mendes de Oliveira, F. Almeida-Fernandes, F. R. Faifer, A. R. Lopes, Y. Jaffe, R. Demarco, C. Lima-Dias, L. Lomel’i-Nu~nez, G. P. Montaguth, W. Schoenell, T. Ribeiro, A. Kanaan arXiv:2404.10847v1 Announce Type: new Abstract: All-sky multi-band photometric surveys represent a unique opportunity of exploring rich nearby galaxy clusters up to several virial radii, reaching the filament regions where pre-processing is expected to occur. These projects aim to tackle a large number of astrophysical topics, encompassing both the galactic and extragalactic fields. InRead More →

The Effect of Pulsar Geometry on the Observed Gamma-ray Spectrum of Millisecond Pulsars Sheridan J. Lloyd, Paula M. Chadwick, Anthony M. Brown arXiv:2404.10872v1 Announce Type: new Abstract: We analyse 13 yrs of $textit{Fermi}$-LAT PASS 8 events from 127 gamma-ray emitting millisecond pulsars (MSPs) in the energy range 0.1$-$100 GeV and significantly detect 118 MSPs. We fit the stacked emission with a log parabola (LP) spectral model which we show is preferred to two previously published models. We consider the influence of pulsar properties and observer geometric effects on spectral features by defining energy flux colours for both the individual MSPs, and our stacked model asRead More →

Signature of systemic rotation in 21 Galactic Globular Clusters from APOGEE-2 Ilaria Petralia, Dante Minniti, Jos’e G. Fern’andez-Trincado, Richard R. Lane, Ricardo P. Schiavon arXiv:2404.10902v1 Announce Type: new Abstract: Context. Traditionally, Globular Clusters (GCs) have been assumed to be quasi-relaxed non-rotating systems, characterized by spherical symmetry and orbital isotropy. However, in recent years, a growing set of observational evidence is unveiling an unexpected dynamical complexity in Galactic GCs. Indeed, kinematic studies show that a measurable amount of internal rotation is present in many present-day GCs. Aims. The objective of this work is to analyse the APOGEE-2 Value-Added Catalogs (VACs) DR17 data of a sample ofRead More →

Representation of a Noisy Transmission Line Martin Bucher (Universit’e Paris Cit’e/CNRS), Daniel Molnar (University of Cambridge) arXiv:2404.10908v1 Announce Type: new Abstract: We analyse a lossy transmission line and the Johnson-Nyquist noise generated therein. A representation as a noisy two-port with a voltage and a current noise sources on one end of a noiseless two-port is given. An expression for the noise properties is given for an arbitrary temperature profile along the transmission line. Agreement is demonstrated between the general expression found here and special cases calculable using thermodynamics. This work is motivated by the REACH experiment to observe the global 21 cm signal for whichRead More →