Search Publications
WIYN Open Cluster Study. XC. Radial-velocity Measurements and Spectroscopic Binary Orbits in the Open Cluster NGC 2506
Latham, David W.; Linck, Evan; Mathieu, Robert D.
NGC 2506 is a rich, intermediate-age (2.0 Gyr), metal-poor ([Fe/H] ∼ ‑0.2) open cluster. This work presents the results of 12,157 spectroscopic radial-velocity measurements of 2442 stars in the NGC 2506 field obtained over 41 yr, made as part of the WIYN Open Cluster Study. Radial-velocity measurements are complete for the population of proper-mot…
Large-field CO (J = 1−0) observations toward SNR G150.3+4.5
Zhang, Shiyu; Su, Yang; Chen, Xuepeng +4 more
Aims: We aim to investigate the molecular environment of the supernova remnant (SNR) G150.3+4.5, and explore its association with ambient molecular clouds (MCs).
Methods: We present large-field CO (J = 1−0) molecular line observations toward SNR G150.3+4.5, using the 13.7 m millimeter telescope of the Purple Mountain Observatory. The obs…
A Repeating Fast Radio Burst Source in a Low-luminosity Dwarf Galaxy
Bhandari, Shivani; Kaspi, Victoria M.; Cognard, Ismaël +52 more
We present the localization and host galaxy of FRB 20190208A, a repeating source of fast radio bursts (FRBs) discovered using CHIME/FRB. As part of the Pinpointing REpeating ChIme Sources with EVN dishes repeater localization program on the European VLBI Network (EVN), we monitored FRB 20190208A for 65.6 hr at ∼1.4 GHz and detected a single burst,…
Effects of coronal rain on decayless kink oscillations of coronal loops
Antolin, Patrick; Pant, Vaibhav; Shrivastav, Arpit Kumar
Decayless kink oscillations are ubiquitously observed in active region coronal loops with an almost constant amplitude for several cycles. Decayless kink oscillations of coronal loops triggered by coronal rain have been analyzed, but the impact of coronal rain formation in an already oscillating loop is unclear. As kink oscillations can help diagn…
High-precision astrometry with VVV. II. A near-infrared extension of Gaia into the Galactic plane
Minniti, D.; Anderson, J.; Bedin, L. R. +4 more
Aims: We use near-infrared, ground-based data from the VISTA Variables in the Via Lactea (VVV) survey to indirectly extend the astrometry provided by the Gaia catalog to objects in heavily extinct regions toward the Galactic bulge and plane that are beyond Gaia's reach.
Methods: We made use of state-of-the-art techniques developed for hi…
The Resolved Star Formation Law in NGC 7469 from JWST, ALMA, and VLA
Fiore, Fabrizio; Lapi, Andrea; Salvestrini, Francesco +4 more
We investigate the star formation process within the central 3.3 kpc region of the nearby luminous infrared Seyfert NGC 7469, probing scales ranging from 88 to 330 pc. We combine JWST/MIRI imaging with the F770W filter, with CO(2 – 1) and the underlying 1.3 mm dust continuum data from the Atacama Large Millimeter/submillimeter Array, along with Ka…
Solar Wind Structures from the Gaussianity of Magnetic Magnitude
Velli, Marco; Matteini, Lorenzo; Sioulas, Nikos +9 more
The heliosphere is permeated with highly structured solar wind originating from the Sun. One of the primary science objectives of Parker Solar Probe (PSP) is to determine the structures and dynamics of the plasma and magnetic fields at the sources of the solar wind. However, establishing the connection between in situ measurements and structures a…
Simultaneous X-ray and optical variability of M dwarfs observed with eROSITA and TESS
Stelzer, B.; Magaudda, E.; Joseph, W. M. +1 more
Context. M-dwarf stars are the most numerous stars in the Galaxy, and are highly magnetically active. They exhibit bursts of radiation and matter, called flares and coronal mass ejections which have the potential to strongly affect the habitability of their planets.
Aims: We investigate variability through simultaneous optical and X-ray obser…
Mg II h&k spectra of an enhanced network region simulated with the MURaM-ChE code: Results using 1.5D synthesis
Solanki, S. K.; Leenaarts, J.; Cameron, R. +3 more
Context. The Mg II h&k lines are key diagnostics of the solar chromosphere. They are sensitive to the temperature, density, and nonthermal velocities in the chromosphere. The average Mg II h&k line profiles arising from previous 3D chromospheric simulations are too narrow compared to observations. Aims. We study the formation and properties of the…
eRASSU J060839.5-704014: A double degenerate ultra-compact binary in the direction of the LMC
Haberl, F.; Rau, A.; Vasilopoulos, G. +7 more
Context. During four all-sky surveys (eRASS1-4), eROSITA, the soft X-ray instrument aboard Spektrum-Roentgen-Gamma (SRG) detected a new supersoft X-ray source, eRASSU J060839.5−704014, in the direction of the Large Magellanic Cloud (LMC).
Aims: We arranged follow-up observations in the X-ray and optical wavelengths and further searched in arc…