Search Publications
Photometric segregation of dwarf and giant FGK stars using the SVO Filter Profile Service and photometric tools
Dupke, Renato; Varela, Jesús; Cenarro, Javier +18 more
Aims. This paper is focused on the segregation of FGK dwarf and giant stars through narrow-band photometric data using the Spanish Virtual Observatory (SVO) Filter Profile Service and associated photometric tools. Methods. We selected spectra from the MILES, STELIB, and ELODIE stellar libraries, and used SVO photometric tools to derive the synthet…
JWST's PEARLS: Resolved study of the stellar and dust components in starburst galaxies at cosmic noon
Kneissl, R.; Berta, S.; Ryan, R. E. +35 more
Dusty star-forming galaxies (DSFGs) significantly contribute to the stellar buildup in galaxies during "cosmic noon," the peak epoch of cosmic star formation. Major mergers and gas accretion are often invoked to explain DSFGs' prodigious star formation rates (SFRs) and large stellar masses. We conducted a spatially resolved morphological analysis …
A Multiwavelength, Multiepoch Monitoring Campaign of Accretion Variability in T Tauri Stars from the ODYSSEUS Survey. I. HST Far-UV and Near-UV Spectra
Herczeg, Gregory J.; France, Kevin; Ábrahám, Péter +17 more
The classical T Tauri star (CTTS) stage is a critical phase of the star and planet formation process. In an effort to better understand the mass accretion processes, which can dictate future stellar evolution and planet formation, a multiepoch, multiwavelength photometric and spectroscopic monitoring campaign of four CTTSs (TW Hya, RU Lup, BP Tau,…
Exploring Low-mass Black Holes through Tidal Disruption Events in the Early Universe: Perspectives in the Era of the JWST, Roman Space Telescope, and LSST Surveys
Harikane, Yuichi; Onoue, Masafusa; Inayoshi, Kohei +3 more
The James Webb Space Telescope (JWST) has recently uncovered the presence of low-luminosity active galactic nuclei (AGNs) at z = 4–11. Spectroscopic observations have provided estimates of the nuclear black hole (BH) masses for these sources, extending the low-mass boundary down to M • ∼ 106–7 M ⊙. Despite this bre…
The longevity of the oldest open clusters. Structural parameters of NGC 188, NGC 2420, NGC 2425, NGC 2682, NGC 6791, and NGC 6819
Jordi, C.; Silva-Villa, E.; Vallenari, A. +5 more
Context. The dynamical evolution of open clusters is driven by stellar evolution, internal dynamics, and external forces, which according to dynamical simulations will lead to their evaporation over a timescale of about 1 Ga. However, about 10% of the known open clusters are older. These latter are special systems whose detailed properties are rel…
On the bright end of the UV luminosity functions of galaxies at z 0.6-1.2
Page, M. J.; Breeveld, A. A.; Ferreras, I. +1 more
We derive the ultraviolet (UV) luminosity function (LF) of star-forming galaxies in the redshift range z = 0.6-1.2, in the rest-frame far-UV (1500 Å) wavelength. For this work, we are in particular interested in the bright end of the UV LF in this redshift range. Data from the XMM-Newton Optical Monitor (XMM-OM), near-UV (2410-3565 Å) observations…
S-PLUS: Photometric Recalibration with the Stellar Color Regression Method and an Improved Gaia XP Synthetic Photometry Method
Huang, Yang; Beers, Timothy C.; Limberg, Guilherme +11 more
We present a comprehensive recalibration of narrowband/medium-band and broadband photometry from the Southern Photometric Local Universe Survey (S-PLUS) by leveraging two approaches: an improved Gaia XP synthetic photometry (XPSP) method with corrected Gaia XP spectra, and the stellar color regression (SCR) method with corrected Gaia Early Data Re…
Uniform Forward-modeling Analysis of Ultracool Dwarfs. III. Late-M and L Dwarfs in Young Moving Groups, the Pleiades, and the Hyades
Liu, Michael C.; Zhang, Zhoujian; Deacon, Niall R. +5 more
We present a uniform forward-modeling analysis of 90 late-M and L dwarfs in nearby young (~10-200 Myr) moving groups, the Pleiades, and the Hyades using low-resolution (R ≈ 150) near-infrared (0.9-2.4 µm) spectra and the BT-Settl model atmospheres. We derive the objects' effective temperatures, surface gravities, radii, and masses by compari…
Cosmic dipoles of active galactic nuclei at optical and radio wavelengths display much larger amplitudes than the cosmic microwave background dipole
Singal, Ashok K.
Sky distributions of large samples of distant active galactic nuclei (AGNs) have shown dipoles significantly larger than the cosmic microwave background (CMB) dipole. However, a recent Bayesian analysis of the Quaia sample, comprising 1.3 million quasars, has yielded a dipole that seems to be in tandem with the CMB dipole, in contravention of most…
Comparing bulge RR Lyrae stars with bulge giants: Insight from 3D kinematics
Zoccali, M.; Valenti, E.; Contreras Ramos, R. +6 more
Context. The structure and kinematics of the old component of the Galactic bulge are still a matter of debate. It is clear that the bulk of the bulge as traced by red clump stars includes two main components, which are usually identified as the metal-rich and metal-poor components. They have different shapes, kinematics, mean metallicities, and al…