Search Publications
Evolution of X-Ray Activity in <25 Myr Old Pre-main Sequence Stars
Garmire, Gordon P.; Feigelson, Eric D.; Broos, Patrick S. +4 more
Measuring the evolution of X-ray emission from pre-main-sequence (PMS) stars gives insight into two issues: the response of magnetic dynamo processes to changes in the interior structure, and the effects of high-energy radiation on protoplanetary disks and primordial planetary atmospheres. We present a sample of 6003 stars with ages 7-25 Myr in 10…
Directly Tracing Cool Filamentary Accretion over >100 kpc into the Interstellar Medium of a Quasar Host at z = 1
Johnson, Sean D.; Kollatschny, Wolfram; Chen, Hsiao-Wen +10 more
We report the discovery of giant (50-100 kpc) [O II] emitting nebulae with MUSE in the field of TXS 0206-048, a luminous quasar at z = 1.13. "Down-the-barrel" UV spectra of the quasar show absorption at velocities coincident with those of the extended nebulae, enabling new insights into inflows and outflows around the quasar host. One nebula exhib…
Barium stars as tracers of s-process nucleosynthesis in AGB stars. I. 28 stars with independently derived AGB mass
Pereira, C. B.; Cseh, B.; D'Orazi, V. +7 more
Context. Barium (Ba) stars are polluted by material enriched in the slow neutron capture (s-process) elements synthesised in the interior of their former asymptotic giant branch (AGB) companion star, which is now a white dwarf.
Aims: We aim to compare individual Ba star abundance patterns to AGB nucleosynthesis model predictions to verify if …
Accretion variability from minute to decade timescales in the classical T Tauri star CR Cha
Pál, A.; Ábrahám, P.; Kóspál, Á. +6 more
Context. Classical T Tauri stars are pre-main-sequence stars that are surrounded by a circumstellar disk from which they accrete material. The mass accretion process is essential in the formation of Sun-like stars. Although often described with simple and static models, the accretion process is inherently time variable.
Aims: We examine the a…
The supernova remnant SN 1006 as a Galactic particle accelerator
Greco, Emanuele; Vink, Jacco; Miceli, Marco +6 more
The origin of cosmic rays is a pivotal open issue of high-energy astrophysics. Supernova remnants are strong candidates to be the Galactic factory of cosmic rays, their blast waves being powerful particle accelerators. However, supernova remnants can power the observed flux of cosmic rays only if they transfer a significant fraction of their kinet…
Probing the Galactic halo with RR Lyrae stars - II. The substructures of the Milky Way
Huang, Y.; Zhang, H. -W.; Zhang, L. +4 more
We identify substructures of the Galactic halo using 3003 type ab RR Lyrae stars with six-dimensional position-velocity information from the Sloan Digital Sky Survey, the Large Sky Area Multi-Object Fiber Spectroscopic Telescope and the Gaia Early Data Release 3. Based on this information, we define the separation of any two of the stars in the in…
The MBHBM⋆ Project - II. Molecular gas kinematics in the lenticular galaxy NGC 3593 reveal a supermassive black hole
Baba, Shunsuke; Imanishi, Masatoshi; Neumayer, Nadine +15 more
As part of the Measuring Black Holes in below Milky Way-mass (M⋆) galaxies (MBHBM⋆) Project, we present a dynamical measurement of the supermassive black hole (SMBH) mass in the nearby lenticular galaxy NGC 3593, using cold molecular gas 12CO(2-1) emission observed at an angular resolution of ≈0${_{.}^{\prime\prime…
Simultaneous Evidence of Edge Collapse and Hub-filament Configurations: A Rare Case Study of a Giant Molecular Filament, G45.3+0.1
Dewangan, L. K.; Ojha, D. K.; Pirogov, L. E. +2 more
We study multiwavelength and multiscale data to investigate the kinematics of molecular gas associated with the star-forming complexes G045.49+00.04 (G45E) and G045.14+00.14 (G45W) in the Aquila constellation. An analysis of the FUGIN 13CO(1-0) line data unveils the presence of a giant molecular filament (GMF G45.3+0.1; length ~75 pc, m…
HD 133729: A blue large-amplitude pulsator in orbit around a main-sequence B-type star
Pigulski, A.; Kotysz, K.; Kołaczek-Szymański, P. A.
Blue large-amplitude pulsators (BLAPs) form a small group of hot objects pulsating in a fundamental radial mode with periods of the order of 30 min. Proposed evolutionary scenarios explain them as evolved low-mass stars: ∼0.3 M⊙ shell-hydrogen-burning objects with a degenerated helium core, more massive (0.5-0.8) M⊙ core-heli…
The Transmission Spectrum of WASP-17 b From the Optical to the Near-infrared Wavelengths: Combining STIS, WFC3, and IRAC Data Sets
Changeat, Quentin; Edwards, Billy; Morvan, Mario +6 more
We present the transmission spectrum of the inflated hot Jupiter WASP-17 b, observed with the STIS and WFC3 instruments aboard the Hubble Space Telescope, allowing for a continuous wavelength coverage from ~0.4 to ~1.7 µm. Observations taken with IRAC channels 1 and 2 on the Spitzer Space Telescope are also included, adding photometric measu…