RAS_WEB (Page 34)

JADES Data Release 3 — NIRSpec/MSA spectroscopy for 4,000 galaxies in the GOODS fields Francesco D’Eugenio, Alex J. Cameron, Jan Scholtz, Stefano Carniani, Chris J. Willott, Emma Curtis-Lake, Andrew J. Bunker, Eleonora Parlanti, Roberto Maiolino, Christopher N. A. Willmer, Peter Jakobsen, Brant E. Robertson, Benjamin D. Johnson, Sandro Tacchella, Phillip A. Cargile, Tim Rawle, Santiago Arribas, Jacopo Chevallard, Mirko Curti, Eiichi Egami, Daniel J. Eisenstein, Nimisha Kumari, Tobias J. Looser, Marcia J. Rieke, Bruno Rodr’iguez Del Pino, Aayush Saxena, Hannah "Ubler, Giacomo Venturi, Joris Witstok, William M. Baker, Rachana Bhatawdekar, Nina Bonaventura, Kristan Boyett, St’ephane Charlot, A. Lola Danhaive, Kevin N. Hainline, Ryan Hausen, JakobRead More →

Exploring the nature of dark matter with the extreme galaxy AGC 114905 Pavel E. Mancera Pi~na, Giulia Golini, Ignacio Trujillo, Mireia Montes arXiv:2404.06537v1 Announce Type: new Abstract: AGC 114905 is a dwarf gas-rich ultra-diffuse galaxy seemingly in tension with the cold dark matter (CDM) model. Specifically, the galaxy appears to have an extremely low-density halo and a high baryon fraction, while CDM predicts dwarfs to have very dense and dominant dark haloes. The alleged tension relies on the galaxy’s rotation curve decomposition, which depends heavily on its inclination. This inclination, estimated from the gas morphology, remains somewhat uncertain. We present unmatched ultra-deep optical imaging ofRead More →

Refracted Gravity Solutions from Small to Large Scales Valentina Cesare arXiv:2404.06538v1 Announce Type: new Abstract: If visible matter alone is present in the Universe, general relativity (GR) and its Newtonian weak field limit (WFL) cannot explain several pieces of evidence, from the largest to the smallest scales. The most investigated solution is the cosmological model $Lambda$ cold dark matter ($Lambda$CDM), where GR is valid and two dark components are introduced, dark energy (DE) and dark matter (DM), to explain the $sim$70% and $sim$25% of the mass-energy budget of the Universe, respectively. An alternative approach is provided by modified gravity theories, where a departure of theRead More →

First Search for High-Energy Neutrino Emission from Galaxy Mergers Subhadip Bouri, Priyank Parashari, Mousumi Das, Ranjan Laha arXiv:2404.06539v1 Announce Type: new Abstract: The exact sources of high-energy neutrinos detected by the IceCube neutrino observatory still remain a mystery. For the first time, this work explores the hypothesis that galaxy mergers may serve as sources for these high-energy neutrinos. Galaxy mergers can host very high-energy hadronic and photohadronic processes, which may produce very high-energy neutrinos. We perform an unbinned maximum-likelihood-ratio analysis utilizing the galaxy merger data from six catalogs and 10 years of public IceCube muon-track data to quantify any correlation between these mergers and neutrinoRead More →

Searching for Triple Systems Unbound by Supernovae Karina Barboza, Christopher S. Kochanek arXiv:2404.06540v1 Announce Type: new Abstract: A large fraction of massive stars are found in higher order systems where the presence of a tertiary may significantly modify the system’s evolution. In particular, it can lead to increased numbers of compact object binaries and accelerate their mergers with important implications for gravitational wave observations. Using Gaia, we constrain the number of Galactic supernovae that produce unbound triples. We do this by searching 8 supernova remnants for stars with consistent Gaia parallaxes and paths intersecting near the center of the supernova remnant at a time consistentRead More →

Uncovering the physical origin of the prominent Lyman-$alpha$ emission and absorption in GS9422 at $z = 5.943$ Chamilla Terp, Kasper E. Heintz, Darach Watson, Gabriel Brammer, Adam Carnall, Joris Witstok, Renske Smit, Simone Vejlgaard arXiv:2404.06543v1 Announce Type: new Abstract: We present a comprehensive spectro-photometric analysis of the galaxy GS9422 from the JADES GTO survey located at $z=5.943$, anomalously showing a simultaneous strong Ly$alpha$ emission feature and damped Ly$alpha$ absorption (DLA), based on JWST NIRSpec and NIRCam observations. The best-fit modelling of the spectral energy distribution (SED) reveals a young, low-mass (${rm log}(M_star/M_{odot}) = 7.8 pm 0.01$) galaxy, with a mass-weighted mean age of the stellarRead More →

The HI Mass Function of Star-forming Galaxies at $zapprox1$ Aditya Chowdhury, Nissim Kanekar, Jayaram N. Chengalur arXiv:2404.06546v1 Announce Type: new Abstract: We present the first estimate of the HI mass function (HIMF) of star-forming galaxies at $zapprox1$, obtained by combining our measurement of the scaling relation between HI mass ($M_{HI}$) and B-band luminosity ($M_B$) of star-forming galaxies with literature estimates of the B-band luminosity function at $zapprox1$. We determined the $M_{HI}-M_B$ relation by using the GMRT-CATz1 survey of the DEEP2 fields to measure the average HI mass of blue galaxies at $z=0.74-1.45$ in three separate $M_B$ subsamples. This was done by separately stacking the HIRead More →

Reconstructing Primordial Black Hole Power Spectra from Gravitational Waves Florian Kuhnel, Ioanna Stamou arXiv:2404.06547v1 Announce Type: new Abstract: A novel methodology for analysing the relation between the energy density in gravitational waves and primordial power spectra is developed. Focusing on scalar-induced gravitational radiation, this methodology is applied to a number of scenarios for the primordial black hole formation. Being differed from conventional Bayesian approaches, its advantages include directness and computational efficiency, which are crucial for handling the complex data characteristic of gravitational wave research. As an important application, it is demonstrated that it allows to systematically identify all scenarios consistent with current and future pulsar-timing-arrayRead More →

Late-end reionization with ATON-HE: towards constraints from Lyman-$alpha$ emitters observed with JWST Shikhar Asthana, Martin G. Haehnelt, Girish Kulkarni, Dominique Aubert, James S. Bolton, Laura C. Keating arXiv:2404.06548v1 Announce Type: new Abstract: We present a new suite of late-end reionization simulations performed with ATON-HE, a revised version of the GPU-based radiative transfer code ATON that includes helium. The simulations are able to reproduce the Ly$alpha$ flux distribution of the E-XQR-30 sample of QSO absorption spectra at $5 lesssim z lesssim 6.2$, and show that a large variety of reionization models are consistent with these data. We explore a range of variations in source models andRead More →

Atmospheric characterisation and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS E. Ahrer, J. V. Seidel, L. Doyle, S. Gandhi, B. Prinoth, H. M. Cegla, C. H. McDonald, N. Astudillo-Defru, E. Ayache, R. Nealon, Dimitri Veras, P. J. Wheatley, D. Ehrenreich arXiv:2404.06550v1 Announce Type: new Abstract: We present high spectral resolution observations of the hot Jupiter WASP-94 A b using the HARPS instrument on ESO’s 3.6m telescope in La Silla, Chile. We probed for Na absorption in its atmosphere as well as constrained the previously reported misaligned retrograde orbit using the Rossiter-McLaughlin effect. Additionally, we undertook a combined atmospheric retrieval analysisRead More →

PSF quality metrics in the problem of revealing Intermediate-Mass Black Holes using MICADO@ELT Mariia Demianenko, Joerg-Uwe Pott, Kai Polsterer arXiv:2404.06558v1 Announce Type: new Abstract: Nowadays, astronomers perform point spread function (PSF) fitting for most types of observational data. Interpolation of the PSF is often an intermediate step in such algorithms. In the case of the Multi-AO Imaging Camera for Deep Observations (MICADO) at the Extremely Large Telescope (ELT), PSF interpolation will play a crucial role in high-precision astrometry for stellar clusters and confirmation of the Intermediate-Mass Black Holes (IMBHs) presence. Significant PSF variations across the field of view invalidate the approach of deconvolution with aRead More →

Differences between Stable and Unstable Architectures of Compact Planetary Systems Kathryn Volk, Renu Malhotra arXiv:2404.06567v1 Announce Type: new Abstract: We present a stability analysis of a large set of simulated planetary systems of three or more planets based on architectures of multiplanet systems discovered by textit{Kepler} and textit{K2}. We propagated 21,400 simulated planetary systems up to 5 billion orbits of the innermost planet; approximately 13% of these simulations ended in a planet-planet collision within that timespan. We examined trends in dynamical stability based on dynamical spacings, orbital period ratios, and mass ratios of nearest-neighbor planets as well as the system-wide planet mass distribution and theRead More →

Ly$alpha$ Emission Line Profiles of Extreme [OIII] Emitting Galaxies at $zgtrsim2$: Implications for Ly$alpha$ Visibility in the Reionization Era Mengtao Tang, Daniel P. Stark, Richard S. Ellis, Michael W. Topping, Charlotte Mason, Zhihui Li, Ad`ele Plat arXiv:2404.06569v1 Announce Type: new Abstract: JWST observations have recently begun delivering the first samples of Ly velocity profile measurements at z>6, opening a new window on the reionization process. Interpretation of z>6 line profiles is currently stunted by limitations in our knowledge of the intrinsic Lya profile (before encountering the IGM) of the galaxies that are common at z>6. To overcome this shortcoming, we have obtained resolved (R~3900) LyaRead More →

Deriving X-ray Line Profiles for Massive-Star Winds from Momentum-Conserving Dynamical Working Surface Solutions Sean J. Gunderson, Kenneth G. Gayley arXiv:2404.06590v1 Announce Type: new Abstract: We present a general procedure for deriving a line profile model for massive star X-ray spectra that captures the dynamics of the wind more directly. The basis of the model is the analytic solution to the problem of variable jets in Herbig-Haro objects given by citet{Canto2000}. In deriving our model, we generalize this jet solution to include flows with a prescribed nonzero acceleration for the context of radiatively driven winds. We provide example line profiles generated from our model for theRead More →

Figuring Out Gas & Galaxies In Enzo (FOGGIE) VIII: Complex and Stochastic Metallicity Gradients at z > 2 Ayan Acharyya, Molly S. Peeples, Jason Tumlinson, Brian W. O Shea, Cassandra Lochhaas, Anna C. Wright, Raymond C. Simons, Ramona Augustin, Britton D. Smith, Eugene Hyeonmin Lee arXiv:2404.06613v1 Announce Type: new Abstract: Gas-phase metallicity gradients are a crucial element in understanding the chemical evolution of galaxies. We use the FOGGIE simulations to study the metallicity gradients ($nabla Z$) of six Milky Way-like galaxies throughout their evolution. FOGGIE galaxies generally exhibit steep negative gradients for most of their history, with only a few short-lived instances reaching positive slopesRead More →

No evidence for anisotropy in galaxy spin directions Dhruva Patel, Harry Desmond arXiv:2404.06617v1 Announce Type: new Abstract: Modern cosmology rests on the cosmological principle, that on large enough scales the Universe is both homogeneous and isotropic. A corollary is that galaxies’ spin vectors should be isotropically distributed on the sky. This has been challenged by multiple authors for over a decade, with claims to have detected a statistically significant dipole pattern of spins. We collect all publicly available datasets with spin classifications (binary clockwise/anticlockwise), and analyse them for large-angle anisotropies ($ell le 2$). We perform each inference in both a Bayesian and frequentist fashion, theRead More →

Constraints on atmospheric water abundance and cloud deck pressure in the warm Neptune GJ 3470 b via CARMENES transmission spectroscopy Spandan Dash, Matteo Brogi, Siddharth Gandhi, Marina Lafarga, Annabella Meech, Aaron Bello-Arufe, Peter J. Wheatley arXiv:2404.06648v1 Announce Type: new Abstract: Observations of cooler atmospheres of super-Earths and Neptune sized objects often show flat transmission spectra. The most likely cause of this trend is the presence of aerosols (i.e. clouds and hazes) in the atmospheres of such objects. High-resolution spectroscopy provides an opportunity to test this hypothesis by targeting molecular species whose spectral line cores extend above the level of such opaque decks. In this work,Read More →

JWST Spectrophotometry of the Small Satellites of Uranus and Neptune Matthew Belyakov, M. Ryleigh Davis, Zachariah Milby, Ian Wong, Michael E. Brown arXiv:2404.06660v1 Announce Type: new Abstract: We use 1.4-4.6 micron multi-band photometry of the small inner Uranian and Neptunian satellites obtained with the James Webb Space Telescope’s near-infrared imager NIRCam to characterize their surface compositions. We find that the satellites of the ice giants have, to first-order, similar compositions to one another, with a 3.0 micron absorption feature possibly associated with an O-H stretch, indicative of water ice or hydrated minerals. Additionally, the spectrophotometry for the small ice giant satellites matches spectra of someRead More →

The influence of thermonuclear bursts on polar caps of accreting X-ray millisecond pulsar MAXI J1816-195 Long Ji, Mingyu Ge, Yupeng Chen, Zhaosheng Li, Peng-Ju Wang, Shu Zhang, Shuang-Nan Zhang arXiv:2404.06747v1 Announce Type: new Abstract: We report accretion-powered pulsations for the first time during thermonuclear bursts in hard X-rays, which were observed with Insight-HXMT in 2022 during the outburst of the accreting X-ray millisecond pulsar MAXI J1816-195. By stacking 73 bursts, we detected pulse profiles in 8-30 keV and 30-100 keV during bursts, which are identical to those obtained from the persistent (non-burst) emission. On average, no significant phase lag was observed between burst and persistentRead More →