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Stellar Abundance Maps of the Milky Way Disk
Hogg, David W.; Rix, Hans-Walter; Price-Whelan, Adrian M. +4 more
To understand the formation of the Milky Way's prominent bar it is important to know whether stars in the bar differ in the chemical element composition of their birth material as compared to disk stars. This requires stellar abundance measurements for large samples across the Milky Way's body. Such samples, e.g., luminous red giant stars observed…
Observational constraints on the deceleration parameter in a tilted universe
Asvesta, Kerkyra; Kazantzidis, Lavrentios; Perivolaropoulos, Leandros +1 more
We study a parametrization of the deceleration parameter in a tilted universe, namely a cosmological model equipped with two families of observers. The first family follows the smooth Hubble flow, while the second is the real observers residing in a typical galaxy inside a bulk flow and moving relative to the smooth Hubble expansion with finite pe…
The Theory of Direct Dark Matter Detection: A Guide to Computations
Del Nobile, Eugenio
A manual for computations in direct Dark Matter detection phenomenology. Featuring self-contained sections on non-relativistic expansion, elastic and inelastic scattering kinematics, Dark Matter velocity distribution, hadronic matrix elements, nuclear form factors, cross sections, rate spectra and parameter-space constraints, as well as a handy tw…
Substructure in the stellar halo near the Sun. I. Data-driven clustering in integrals-of-motion space
Koppelman, H. H.; Helmi, A.; Ruiz-Lara, T. +3 more
Context. Merger debris is expected to populate the stellar haloes of galaxies. In the case of the Milky Way, this debris should be apparent as clumps in a space defined by the orbital integrals of motion of the stars.
Aims: Our aim is to develop a data-driven and statistics-based method for finding these clumps in integrals-of-motion space fo…
Direct-imaging Discovery and Dynamical Mass of a Substellar Companion Orbiting an Accelerating Hyades Sun-like Star with SCExAO/CHARIS
Currie, Thayne; Kwon, Jungmi; Tamura, Motohide +33 more
We present the direct-imaging discovery of a substellar companion in orbit around a Sun-like star member of the Hyades open cluster. So far, no other substellar companions have been unambiguously confirmed via direct imaging around main-sequence stars in Hyades. The star HIP 21152 is an accelerating star as identified by the astrometry from the Ga…
Testing gravity on cosmic scales: A case study of Jordan-Brans-Dicke theory
Joudaki, Shahab; Ferreira, Pedro G.; Lima, Nelson A. +1 more
We provide an end-to-end exploration of a distinct modified gravitational theory in Jordan-Brans-Dicke (JBD) gravity, from an analytical and numerical description of the background expansion and linear perturbations, to the nonlinear regime captured with a hybrid suite of N -body simulations, to the cosmological constraints from existing probes of…
Low-power jet-interstellar medium interaction in NGC 7319 revealed by JWST/MIRI MRS
Colina, L.; Hönig, S. F.; García-Burillo, S. +8 more
We present JWST/MIRI MRS spectroscopy of NGC 7319, the largest galaxy in the Stephan's Quintet, observed as part of the Early Release Observations (ERO). NGC 7319 hosts a type 2 active galactic nucleus (AGN) and a low-power radio jet (L1.4 GHz = 3.3 × 1022 W Hz−1) with two asymmetric radio hotspots at 430 pc (N2) a…
The first ground-level enhancement of solar cycle 25 on 28 October 2021
Usoskin, I.; Vainio, R.; Gieseler, J. +8 more
Aims: The first relativistic solar proton event of solar cycle 25 was detected on 28 October 2021 by neutron monitors (NMs) on the ground and particle detectors on board spacecraft in near-Earth space. This is the first ground-level enhancement (GLE) of the current cycle. A detailed reconstruction of the NM response together with the identifi…
GOODS-ALMA 2.0: Starbursts in the main sequence reveal compact star formation regulating galaxy evolution prequenching
Magnelli, B.; Daddi, E.; Elbaz, D. +38 more
Compact star formation appears to be generally common in dusty star-forming galaxies (SFGs). However, its role in the framework set by the scaling relations in galaxy evolution remains to be understood. In this work we follow up on the galaxy sample from the GOODS-ALMA 2.0 survey, an ALMA blind survey at 1.1 mm covering a continuous area of 72.42 …
A New Estimate of the Cosmic Star Formation Density from a Radio-selected Sample, and the Contribution of H-dark Galaxies at z ≥ 3
Bisigello, Laura; Pozzi, Francesca; Calura, Francesco +13 more
The star formation rate density (SFRD) history of the universe is well constrained up to redshift z ~ 2. At earlier cosmic epochs, the picture has been largely inferred from UV-selected galaxies (e.g., Lyman-break galaxies; LBGs). However, the inferred star formation rates of LBGs strongly depend on the assumed dust extinction correction, which is…