Search Publications
Submillimeter imaging of the Galactic Center starburst Sgr B2. Warm molecular, atomic, and ionized gas far from massive star-forming cores
Cernicharo, J.; Goicoechea, J. R.; Etxaluze, M. +2 more
Context. Star-forming galaxies emit bright molecular and atomic lines in the submillimeter and far-infrared (FIR) domains. However, it is not always clear which gas heating mechanisms dominate and which feedback processes drive their excitation.
Aims: The Sgr B2 complex is an excellent template to spatially resolve the main OB-type star-formi…
Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V - K Color
Ciardi, David R.; Clark, Catherine A.; van Belle, Gerard T. +8 more
We calculate directly determined values for effective temperature (T eff) and radius (R) for 191 giant stars based upon high-resolution angular size measurements from optical interferometry at the Palomar Testbed Interferometer. Narrow- to wideband photometry data for the giants are used to establish bolometric fluxes and luminosities t…
Heavy-elements heritage of the falling sky
de Laverny, Patrick; Recio-Blanco, Alejandra; Helmi, Amina +3 more
Context. A fundamental element of galaxy formation is the accretion of mass through mergers of satellites or gas. Recent dynamical analyses based on Gaia data have revealed major accretion events in the history of the Milky Way. Nevertheless, our understanding of the primordial Galaxy is hindered because the bona fide identification of the most me…
Random Walk and Trapping of Interplanetary Magnetic Field Lines: Global Simulation, Magnetic Connectivity, and Implications for Solar Energetic Particles
Matthaeus, William H.; Goldstein, Melvyn L.; Usmanov, Arcadi V. +4 more
The random walk of magnetic field lines is an important ingredient in understanding how the connectivity of the magnetic field affects the spatial transport and diffusion of charged particles. As solar energetic particles propagate away from near-solar sources, they interact with the fluctuating magnetic field, which modifies their distributions. …
A Comprehensive Analysis of NGC 2158 in the Gaia Era: Photometric Parameters, Apex, and Orbit
Bisht, D.; Yadav, R. K. S.; Vereshchagin, S. V. +7 more
We present an investigation of NGC 2158 using Gaia DR2 data. We identified 800 most likely cluster members with membership probability higher than 90%. The mean proper motions of this object are determined as (µx = -0.203 ± 0.003, µy = -1.99 ± 0.004) mas yr-1. The limiting radius, log(age), and distance…
Probing Current Sheet Instabilities from Flare Ribbon Dynamics
Matthews, Sarah A.; French, Ryan J.; Jonathan Rae, I. +1 more
The presence of current sheet instabilities, such as the tearing mode instability, are needed to account for the observed rate of energy release in solar flares. Insights into these current sheet dynamics can be revealed by the behavior of flare ribbon substructure, as magnetic reconnection accelerates particles down newly reconnected field lines …
The INTEGRAL view on black hole X-ray binaries
Rodriguez, J.; Wilms, J.; Motta, S. E. +11 more
INTEGRAL is an ESA mission in fundamental astrophysics that was launched in October 2002. It has been in orbit for over 18 years, during which it has been observing the high-energy sky with a set of instruments specifically designed to probe the emission from hard X-ray and soft γ-ray sources. This paper is devoted to the subject of black hole bin…
J-PLUS: The star formation main sequence and rate density at d ≲ 75 Mpc
Hernández-Monteagudo, C.; Galbany, L.; Hernán-Caballero, A. +20 more
Aims: Our goal is to estimate the star formation main sequence (SFMS) and the star formation rate density (SFRD) at z ≤ 0.017 (d ≲ 75 Mpc) using the Javalambre Photometric Local Universe Survey (J-PLUS) first data release, that probes 897.4 deg2 with twelve optical bands.
Methods: We extract the Hα emission flux of 805 local g…
On the Issue of the Origin of Type II Solar Radio Bursts
Chernov, Gennady; Fomichev, Valery
Type II solar radio bursts are among the most powerful events in the solar radio emission in the meter wavelength range. It is generally accepted that the agents generating type II radio bursts are magnetohydrodynamic shock waves. But the relationship between the shock waves and the other manifestations of the large-scale disturbances in the solar…
Revisiting the Fundamental Parameters of 49 New Star Clusters in Gaia DR2
Li, Zhongmu; Chen, Jing; Deng, Yangyang
Reliable fundamental parameters of star clusters such as distance modulus, metallicity, age, extinction, and binary fraction are of key importance for astrophysical studies. Although a lot of new star clusters were identified from the data of, e.g., Gaia Data Release 2 (Gaia DR2), the fundamental parameters of many clusters were not determined rel…