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Ytterbium atom interferometry for dark matter searches
Zhou, Yifan; Ranson, Rowan; Panagiotou, Michalis +1 more
We analyze the projected sensitivity of a laboratory-scale ytterbium atom interferometer to scalar, vector, and pseudoscalar dark matter signals. A frequency ratio measurement between two transitions in
Cosmic-ray diffusion in two local filamentary clouds
Grenier, I. A.; Kamal Youssef, F. R.
Context. Hadronic interactions between cosmic rays (CRs) and interstellar gas have been probed in γ rays across the Galaxy. A fairly uniform CR distribution is observed up to a few hundred parsecs from the Sun, except in the Eridu cloud, which shows an unexplained 30-50% deficit in GeV to TeV CR flux.
Aims: To explore the origin of this defic…
Study on Test-Mass Charging for Taiji Gravitational Wave Observatory
Han, Ruilong; Cai, Minghui; Yang, Tao +8 more
Taiji is proposed as a space-based gravitational wave (GW) observatory consisting of three spacecraft in a heliocentric orbit meanwhile with the distance of 3 million kilometers ahead of the Earth at about 20°. Free-falling test masses (TMs) are a key component of the interferometer for space-based GW detection in the 0.1mHz-1 Hz frequency range. …
Calibrating the metallicity of M dwarfs in wide physical binaries with F-, G-, and K-primaries - II: carbon, oxygen, and odd-Z iron-peak abundances of the primary stars
Caballero, J. A.; Montes, D.; Duque-Arribas, C. +1 more
Detailed chemical composition of stars is of prime interest for a range of topics in modern stellar astrophysics, such as the chemical evolution of the Galaxy or the formation, composition, and structure of exoplanets. In this work, we derive the C and O abundances and update Sc, V, Mn, and Co abundances considering hyperfine structure effects and…
Exploration of Halo Substructures in Integrals-of-motion Space with Gaia Data Release 3
Ye, Dashuang; Du, Cuihua; Deng, Mingji +2 more
Using kinematic data from the Gaia Data Release 3 catalog, along with metallicity estimates robustly derived from Gaia BP/RP spectra, we have explored the Galactic stellar halo in search of both known and potentially new substructures. By applying the Hierarchical Density-Based Spatial Clustering of Applications with Noise clustering algorithm in …
The MIRI/MRS Library. I. Empirically correcting detector charge migration in unresolved sources
Gordon, Karl D.; Law, David R.; Patapis, Polychronis +7 more
Context. The James Webb Space Telescope (JWST) has been collecting scientific data for over two years now. The Medium Resolution Spectrometer (MRS) of the Mid-InfraRed Instrument (MIRI) has been one of the telescope's most popular modes, and has already produced ground-breaking results. Scientists are now looking deeper into the data for new excit…
The merger of hard binaries in globular clusters as the primary channel for the formation of second-generation stars
Kravtsov, Valery; Calderón, Francisco A.; Dib, Sami
We have recently presented observational evidence which suggests that the origin of the second-generation (G2) stars in globular clusters (GCs) is due to the binary-mediated collision of primordial (G1) low-mass main-sequence (MS) stars. This mechanism avoids both the mass budget problem and the need of external gas for dilution. Here, we report o…
NGC 5474 X-1: A neutron star ultraluminous X-ray source in an old stellar cluster?
Fabrika, Sergei; Atapin, Kirill; Vinokurov, Alexander +4 more
We present an optical and X-ray study of the ultraluminous X-ray source (ULX) NGC 5474 X-1. The X-ray spectrum taken during the bright state of the source (LX ~ 2 × 1040 erg s-1) shows signatures of a broad absorption line at ≃ 8 keV, which may be a cyclotron resonant scattering feature. This implies that this syst…
La Silla-QUEST RR Lyrae star survey II: the Crater II tidal streams
Girard, T.; Baltay, C.; Howard, R. +5 more
We describe photometry improvements in the La Silla-Quest RR Lyrae star (RRLS) survey that enable it to reach distances from the Sun (d⊙) ~140 kpc. We report the results of surveying ~300 deg2 of sky around the large, low-surface-brightness Crater II dwarf spheroidal galaxy. At d⊙ >80 kpc, we find a large overde…
A CIGALE module tailored (not only) for low-luminosity active galactic nuclei
Alexander, D. M.; Lapi, A.; Comastri, A. +17 more
The spectral energy distribution (SED) of low-luminosity active galactic nuclei (LLAGN) presents unique challenges as the emission from these objects is comparable to the radiation from their host galaxy and the accretion physics involved is particularly complex. This study introduces a novel CIGALE module specifically designed to address these ch…