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A 3D view of dwarf galaxies with Gaia and VLT/FLAMES. I. The Sculptor dwarf spheroidal
Salaris, Maurizio; Brown, Anthony G. A.; Helmi, Amina +12 more
We present a new homogeneous survey of VLT/FLAMES LR8 line-of-sight radial velocities (vlos) for 1604 resolved red giant branch stars in the Sculptor dwarf spheroidal galaxy. In addition, we provide reliable Ca II triplet metallicities, [Fe/H], for 1339 of these stars. From this combination of new observations (2257 individual spectra) …
Stochastic gravitational wave background constraints from Gaia DR3 astrometry
García-Bellido, Juan; Kuroyanagi, Sachiko; Braglia, Matteo +2 more
Astrometric surveys can be used to constrain the stochastic gravitational wave background (SGWB) at very low frequencies. We use proper motion data provided by Gaia DR3 to fit a generic dipole+quadrupole field. We analyse several quasar-based data sets and discuss their purity and idoneity to set constraints on gravitational waves. For the cleanes…
The e-TidalGCs project. Modeling the extra-tidal features generated by Galactic globular clusters
Mastrobuono-Battisti, Alessandra; Khoperskov, Sergey; Di Matteo, Paola +5 more
We present the e-TidalGCs project, aimed at modeling and predicting the extra-tidal features surrounding all Galactic globular clusters for which 6D phase-space information, masses, and sizes are available (currently numbering 159 globular clusters). We focus the analysis and presentation of the results on the distribution of extra-tidal material …
Radio-loud Exoplanet-exomoon Survey: GMRT Search for Electron Cyclotron Maser Emission
Manoj, P.; Narang, Mayank; Oza, Apurva V. +3 more
We conducted the first dedicated search for signatures of exoplanet-exomoon interactions using the Giant Metrewave Radio Telescope (GMRT) as part of the radio-loud exoplanet-exomoon survey. Due to stellar tidal heating, irradiation, and subsequent atmospheric escape, candidate "exo-Io" systems are expected to emit up to 106 times more p…
A Type II Radio Burst Driven by a Blowout Jet on the Sun
Tian, Hui; Madjarska, Maria S.; Deng, Yuanyong +5 more
Type II radio bursts are often associated with coronal shocks that are typically driven by coronal mass ejections (CMEs) from the Sun. Here we conduct a case study of a type II radio burst that is associated with a C4.5-class flare and a blowout jet, but without the presence of a CME. The blowout jet is observed near the solar disk center in the e…
Carbon Stars as Standard Candles: An Empirical Test for the Reddening, Metallicity, and Age Sensitivity of the J-region Asymptotic Giant Branch (JAGB) Method
Lee, Abigail J.
The J-region Asymptotic Giant Branch (JAGB) method is a standard candle based on the intrinsic luminosities of carbon stars in the near-infrared. We directly constrain the impact of metallicity, age, and reddening on the JAGB method. We assess how the mode, skew, and spread of the JAGB star LF change throughout diverse stellar environments in M31'…
Substructure, supernovae, and a time-resolved star formation history for Upper Scorpius
Chanamé, Julio; Briceño-Morales, Geovanny
The improved astrometry precision of Gaia-eDR3 allows us to perform a detailed study of the Upper Scorpius OB association and revisit its spatial, kinematic, and age substructure. We achieve this by combining clustering techniques and complementing with age estimations based on Gaia photometry. Our census retrieves 3661 candidate members for Upper…
Oxygen and iron in interstellar dust: An X-ray investigation
Waters, L. B. F. M.; Mutschke, H.; Costantini, E. +9 more
Understanding the chemistry of the interstellar medium (ISM) is fundamental for the comprehension of Galactic and stellar evolution. X-rays provide an excellent way to study the dust chemical composition and crystallinity along different sight lines in the Galaxy. In this work, we study the dust grain chemistry in the diffuse regions of the ISM in…
Low-redshift estimates of the absolute scale of baryon acoustic oscillations
Ruchika; Alcaniz, Jailson; Lemos, Thais +1 more
Measurements of the characteristic length scale
The extreme super-eddington NLS1 RX J0134.2-4258 - II. A weak-line Seyfert linking to the weak-line quasar
Done, Chris; Ward, Martin; Jin, Chichuan +3 more
RX J0134.2-4258 is one of the most super-Eddington narrow-line Seyfert 1 (NLS1) galaxies, on which we conducted a monitoring campaign from radio to X-rays. In this paper, we present a detailed analysis of its optical/UV spectra and broad-band spectral energy distribution. Our study shows that the preferred black hole mass of RX J0134.2-4258 is M