Search Publications
Early-time Ultraviolet and Optical Hubble Space Telescope Spectroscopy of the Type II Supernova 2022wsp
Filippenko, Alexei V.; Modjaz, Maryam; Matheson, Thomas +10 more
We report early-time ultraviolet (UV) and optical spectroscopy of the young, nearby Type II supernova (SN) 2022wsp obtained by the Hubble Space Telescope (HST)/STIS at about 10 and 20 days after the explosion. The SN 2022wsp UV spectra are compared to those of other well-observed Type II/IIP SNe, including the recently studied Type IIP SN 2021yja.…
Application of a neural network classifier for the generation of clean Small Magellanic Cloud stellar samples
Luri, X.; Masana, E.; Jiménez-Arranz, Ó. +1 more
Context. Previous attempts to separate Small Magellanic Cloud (SMC) stars from the Milky Way (MW) foreground stars are based only on the proper motions of the stars.
Aims: In this paper, we aim to develop a statistical classification technique to effectively separate the SMC stars from the MW stars using a wider set of Gaia data. We aim to re…
1D non-LTE corrections for chemical abundance analyses of very metal-poor stars
Jablonka, P.; Hill, V.; Sitnova, T. +3 more
Detailed chemical abundances of very metal-poor (VMP; [Fe/H] < -2) stars are important for better understanding the first stars, early star formation, and chemical enrichment of galaxies. Big on-going and coming high-resolution spectroscopic surveys provide a wealth of material that needs to be carefully analysed. For VMP stars, their elemental…
A Herschel study of G214.5-1.8: a young, cold, and quiescent giant molecular filament on the shell of a H I superbubble
Schneider, N.; Sánchez-Monge, Á.; Clarke, S. D. +3 more
We present an analysis of the outer Galaxy giant molecular filament (GMF) G214.5-1.8 (G214.5) using Herschel data. We find that G214.5 has a mass of ~16 000 M⊙, yet hosts only 15 potentially protostellar 70-$\mu$m sources, making it highly quiescent compared to equally massive clouds such as Serpens and Mon R2. We show that G214.5 has a…
The Lively Accretion Disk in NGC 2992. III. Tentative Evidence of Rapid Ultrafast Outflow Variability
Nardini, Emanuele; Bianchi, Stefano; Piconcelli, Enrico +8 more
We report on the 2019 XMM-Newton+NuSTAR monitoring campaign of the Seyfert galaxy NGC 2992, observed at one of its highest flux levels in the X-rays. The time-averaged spectra of the two XMM-Newton orbits show ultrafast outflows (UFOs) absorbing structures above 9 keV with >3σ significance. A detailed investigation of the temporal evolution on …
Measuring the variability of directly imaged exoplanets using vector Apodizing Phase Plates combined with ground-based differential spectrophotometry
Ertel, Steve; Woodward, Charles E.; Kenworthy, Matthew A. +11 more
Clouds and other features in exoplanet and brown dwarf atmospheres cause variations in brightness as they rotate in and out of view. Ground-based instruments reach the high contrasts and small inner working angles needed to monitor these faint companions, but their small fields of view lack simultaneous photometric references to correct for non-as…
Bridging the gap in the mass-size relation of compact galaxies with MaNGA
Domínguez-Sánchez, H.; Ferré-Mateu, A.; Grèbol-Tomàs, P.
We present the analysis of the full Mapping Nearby Galaxies at APO (MaNGA) DR17 sample to characterize its population of compact galaxies. We focus on galaxies that fill the stellar mass (M⋆) gap between compact elliptical galaxies (cEs; 8 ≲ log (M⋆/M⊙) ≲ 10) and compact massive galaxies (CMGs; 10 ≲ log (M⋆
Exploring the structure and kinematics of the Milky Way through A stars
Monguió, M.; Figueras, F.; Carrasco, J. M. +2 more
Context. Despite their relatively high intrinsic brightness and the fact that they are more numerous than younger OB stars and kinematically colder than older red giants, A-type stars have rarely been used as Galactic tracers. They may, in fact, be used to fill the age gap between these two tracers, thereby allowing us to evaluate the evolutionary…
An Ap Star Catalog Based on LAMOST DR9
Xiang, Maosheng; Zhang, Huawei; Fu, Jianning +2 more
We present a sample of 2700 Ap stars in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR9 catalog. The candidates are first selected to be in a temperature range typical of Ap stars by using the BP - RP color index from Gaia DR3. Then the 5200 Å flux depression features characteristic of Ap stars are visually checked in LA…
Radio jet-ISM interaction and positive radio-mechanical feedback in Abell 1795
McNamara, Brian R.; Carniani, Stefano; Maiolino, Roberto +8 more
We present XSHOOTER observations with previous ALMA, MUSE, and HST observations to study the nature of radio jet triggered star formation and the interaction of radio jets with the interstellar medium in the brightest cluster galaxy (BCG) in the Abell 1795 cluster. Using HST UV data, we determined an ongoing star formation rate of 9.3 M⊙