Search Publications
Catalog of the Galactic Population of X-Ray Pulsars in High-mass X-Ray Binary Systems
Kim, Vitaliy; Izmailova, Ildana; Aimuratov, Yerlan
A catalog of the Galactic population of X-ray pulsars in high-mass X-ray binary (HMXB) systems is presented. It contains information about 82 confirmed sources: 18 persistent and 64 transient pulsars. Their basic parameters include spin period, spin evolution with global and local spin-up/spin-down and duration, orbital period, X-ray luminosity, m…
Relationships between energetic storm particle events and interplanetary shocks driven by full and partial halo coronal mass ejections
Vainio, Rami; Valtonen, Eino; Al-Sawad, Amjad +1 more
We have analysed energetic storm particle (ESP) events in 116 interplanetary (IP) shocks driven by front-side full and partial halo coronal mass ejections (CMEs) with speeds > 400 km s-1during the years 1996-2015. We investigated the occurrence and relationships of ESP events with several parameters describing the IP shocks, and the …
An emerging and enigmatic spectral class of isolated DAe white dwarfs
Hermes, J. J.; Munday, James; Gänsicke, Boris T. +9 more
Two recently discovered white dwarfs, WD J041246.84 + 754942.26 and WD J165335.21 - 100116.33, exhibit Hα and Hβ Balmer line emission similar to stars in the emerging DAHe class, yet intriguingly have not been found to have detectable magnetic fields. These white dwarfs are assigned the spectral type DAe. We present detailed follow-up of the two k…
Alignment of dense molecular core morphology and velocity gradients with ambient magnetic fields
Di Francesco, J.; Caselli, P.; Pineda, J. E. +15 more
Studies of dense core morphologies and their orientations with respect to gas flows and the local magnetic field have been limited to only a small sample of cores with spectroscopic data. Leveraging the Green Bank Ammonia Survey alongside existing sub-millimeter continuum observations and Planck dust polarization, we produce a cross-matched catalo…
Milky Way globular clusters on cosmological timescales. III. Interaction rates
Berczik, Peter; Ishchenko, Maryna; Omarov, Chingis +4 more
Aims: We carry out the self-consistent dynamic evolution of the orbital structure of Milky Way globular clusters. This allows us to estimate possible and probable close passages and even collisions of the clusters with each other.
Methods: We reproduced the orbits of 147 globular clusters in 10 Gyr lookback time using our own high-order …
Chrono-chemodynamical analysis of the globular cluster NGC 6355: Looking for the fundamental bricks of the Bulge
Valentini, M.; Chiappini, C.; Bica, E. +7 more
The information on Galactic assembly time is imprinted on the chemodynamics of globular clusters. This makes them important probes that help us to understand the formation and evolution of the Milky Way. Discerning between in-situ and ex-situ origin of these objects is difficult when we study the Galactic bulge, which is the most complex and mixed…
Discovery of two promising isolated neutron star candidates in the SRG/eROSITA All-Sky Survey
Haberl, F.; Buckley, D. A. H.; Pires, A. M. +2 more
We report the discovery of the isolated neutron star (INS) candidates
The discovery of three hot Jupiters, NGTS-23b, 24b, and 25b, and updated parameters for HATS-54b from the Next Generation Transit Survey
de Mooij, Ernst J. W.; Jackman, James A. G.; Wheatley, Peter J. +35 more
We report the discovery of three new hot Jupiters with the Next Generation Transit Survey (NGTS) as well as updated parameters for HATS-54b, which was independently discovered by NGTS. NGTS-23b, NGTS-24b, and NGTS-25b have orbital periods of 4.076, 3.468, and 2.823 d and orbit G-, F-, and K-type stars, respectively. NGTS-24 and HATS-54 appear clos…
Obscuring Environment and X-Ray Variability of Compact Symmetric Objects Unveiled with XMM-Newton and NuSTAR
Ostorero, Luisa; Guainazzi, Matteo; Stawarz, Łukasz +3 more
Compact symmetric objects (CSOs) show radio features such as jets, lobes, and hot spots, which are contained within their host galaxies, and likely represent a recent radio activity. A subpopulation of CSOs with high intrinsic X-ray column densities has been inferred from shallow, soft X-ray band exposures, and observed to cluster in the linear ra…
Radio detections of two unusual cataclysmic variables in the VLA Sky Survey
Heinke, C. O.; Sivakoff, G. R.; Hughes, A. K. +1 more
We report two new radio detections of cataclysmic variables (CVs), and place them in context with radio and X-ray detections of other CVs. We detected QS Vir, a low accretion-rate CV; V2400 Oph, a discless intermediate polar; and recovered the polar AM Her in the Very Large Array Sky Survey 2-4 GHz radio images. The radio luminosities of these sys…