Vela ≈ Vela
View article
New long-term braking index measurements for glitching pulsars using a glitch-template method Open
Braking index measurements offer the opportunity to explore the processes affecting the long-term spin evolution of pulsars and possible evolutionary connections between the various pulsar populations. For young pulsars the long-term trend…
View article
Expanding associations in the Vela-Puppis region Open
Context . The Vela-Puppis region is known to host the Vela OB2 association as well as several young clusters featuring OB and pre-main-sequence stars. Several spatial and kinematic subgroups have been identified in recent years. Aims . By …
View article
The relation between the column density structures and the magnetic field orientation in the Vela C molecular complex Open
We statistically evaluated the relative orientation between gas column density structures, inferred from Herschel submillimetre observations, and the magnetic field projected on the plane of sky, inferred from polarized thermal emission of…
View article
Gravitational-wave Constraints on the Equatorial Ellipticity of Millisecond Pulsars Open
We present a search for continuous gravitational waves from five radio pulsars, comprising three recycled pulsars (PSR J0437-4715, PSR J0711-6830, and PSR J0737-3039A) and two young pulsars: the Crab pulsar (J0534+2200) and the Vela pulsar…
View article
Diffusion in pulsar wind nebulae: an investigation using magnetohydrodynamic and particle transport models Open
We study the transport of high-energy particles in pulsar wind nebulae (PWN) using three-dimensional magnetohydrodynamic (MHD) and test-particle simulations, as well as a Fokker–Planck particle transport model. The latter includes radiativ…
View article
Deciphering the Dipole Anisotropy of Galactic Cosmic Rays Open
Recent measurements of the dipole anisotropy in the arrival directions of Galactic cosmic rays (CRs) indicate a strong energy dependence of the dipole amplitude and phase in the TeV-PeV range. We argue here that these observations can be w…
View article
An application of an optimal statistic for characterizing relative orientations Open
We present the projected Rayleigh statistic (PRS), a modification of the classic Rayleigh statistic, as a test for non-uniform relative orientation between two pseudo-vector fields. In the application here this gives an effective way of in…
View article
High time resolution observations of the Vela pulsar Open
We present high time resolution observations of single pulses from the Vela pulsar (PSR B0833-45) made with a baseband recording system at observing frequencies of 660 and 1413 MHz. We have discovered two startling features in the 1413 MHz…
View article
Measuring the stellar wind parameters in IGR J17544-2619 and Vela X-1 constrains the accretion physics in supergiant fast X-ray transient and classical supergiant X-ray binaries Open
Classical Supergiant X-ray Binaries (SGXBs) and Supergiant Fast X-ray\nTransients (SFXTs) are two types of High-mass X-ray Binaries (HMXBs) that\npresent similar donors but, at the same time, show very different behavior in\nthe X-rays. Th…
View article
Searches for Gravitational Waves from Known Pulsars at Two Harmonics in the Second and Third LIGO-Virgo Observing Runs Open
We present a targeted search for continuous gravitational waves (GWs) from 236 pulsars using data from the third observing run of LIGO and Virgo (O3) combined with data from the second observing run (O2). Searches were for emission from th…
View article
A new solution of embedding class I representing anisotropic fluid sphere in general relativity Open
In this paper, we are willing to develop a model of an anisotropic star by choosing a new [Formula: see text] metric potential. All the physical parameters like the matter density, radial and transverse pressure are regular inside the anis…
View article
Coupling hydrodynamics with comoving frame radiative transfer Open
Context. Vela X-1, a prototypical high-mass X-ray binary (HMXB), hosts a neutron star (NS) in a close orbit around an early-B supergiant donor star. Accretion of the donor star's wind onto the NS powers its strong X-ray luminosity. To unde…
View article
Possible origin of the slow-diffusion region around Geminga Open
Geminga pulsar is surrounded by a multiTeV γ-ray halo radiated by the high-energy electrons and positrons accelerated by the central pulsar wind nebula (PWN). The angular profile of the γ-ray emission reported by High-Altitude Water Cheren…
View article
Effect of electric charge on conformal compact stars Open
\n We investigate the effect of electric charge in anisotropic compact stars with conformal symmetry. We assume that the pressure and the density of the matter inside the stellar structure are large with strong gravitational fields. The st…
View article
Discovery of a supercluster in the Zone of Avoidance in Vela Open
We report the discovery of a potentially major supercluster that extends across the Galactic plane in the constellation of Vela, at a mean recessional velocity of ∼18 000 km s−1. Recent multiobject spectroscopic observations of this Vela s…
View article
A ring in a shell: the large-scale 6D structure of the Vela OB2 complex Open
Context. The Vela OB2 association is a group of ∼10 Myr stars exhibiting a complex spatial and kinematic substructure. The all-sky Gaia DR2 catalogue contains proper motions, parallaxes (a proxy for distance), and photometry that allow us …
View article
Gravitational waves from transient neutron star -mode oscillations Open
During their most recent observing run, LIGO/Virgo reported the gravitational wave (GW) transient S191110af, a burst signal at a frequency of 1.78 kHz that lasted for 0.104 s. While this signal was later deemed non-astrophysical, genuine d…
View article
Giant pulsar glitches and the inertia of neutron star crusts Open
Giant pulsar frequency glitches as detected in the emblematic Vela pulsar have long been thought to be the manifestation of a neutron superfluid permeating the inner crust of a neutron star. However, this superfluid has been recently found…
View article
Uncovering a 260 pc wide, 35-Myr-old filamentary relic of star formation Open
Several recent studies have shown that the Vela OB2 region hosts a complex constellation of sub-populations with ages in the range 10 to 50 Myr. Such populations might represent the best example of the outcome of clustered star formation i…
View article
A sextet of clusters in the Vela OB2 region revealed by <i>Gaia</i> Open
Using Gaia DR2 data, combined with OmegaCAM ground-based optical photometry from the Accretion Disc with OmegaCAM survey, and detailed radial velocity measurements from ESO-Gaia, we analyse in detail a 10 × 5 deg region around the Wolf–Ray…
View article
The clumpy absorber in the high-mass X-ray binary Vela X-1 Open
Bright and eclipsing, the high-mass X-ray binary Vela X-1 offers a unique opportunity to study accretion onto a neutron star from clumpy winds of O/B stars and to disentangle the complex accretion geometry of these systems. In Chandra-HETG…
View article
Some families of relativistic anisotropic compact stellar models embedded in pseudo-Euclidean space $$E^5$$ E 5 : an algorithm Open
\n This work presents an algorithm for modeling a static spherically symmetric compact object satisfying the Eiesland condition (Eiesland in Am Math Soc 27:213, 1925), a necessary and sufficient condition that a general centro-symmetric sp…
View article
The <i>Gaia</i> DR2 view of the Gamma Velorum cluster: resolving the 6D structure Open
Gaia -ESO Survey observations of the young Gamma Velorum cluster led to the discovery of two kinematically distinct populations, Gamma Vel A and B, respectively, with population B extended over several square degrees in the Vela OB2 associ…
View article
Global numerical simulations of the rise of vortex-mediated pulsar glitches in full general relativity Open
In this paper, we study in detail the role of general relativity on the global dynamics of giant pulsar glitches as exemplified by Vela. For this purpose, we carry out numerical simulations of the spin up triggered by the sudden unpinning …
View article
How to search for gravitational waves from -modes of known pulsars Open
Searches for continuous gravitational waves from known pulsars so far have\nbeen targeted at or near the spin frequency or double the spin frequency of\neach pulsar, appropriate for mass quadrupole emission. But some neutron stars\nmight r…
View article
STRUCTURES OF THE VELA PULSAR AND THE GLITCH CRISIS FROM THE BRUECKNER THEORY Open
Detailed structures of the Vela pulsar (PSR B0833-45, with a period of 89.33 ms) are predicted by adopting a recently constructed unified treatment of all parts of neutron stars: the outer crust, the inner crust, and the core based on mode…
View article
First search for long-duration transient gravitational waves after glitches in the Vela and Crab pulsars Open
Gravitational waves (GWs) can offer a novel window into the structure and dynamics of neutron stars. Here we present the first search for long-duration quasimonochromatic GW transients triggered by pulsar glitches. We focus on two glitches…
View article
SUBMILLIMETER POLARIZATION SPECTRUM IN THE VELA C MOLECULAR CLOUD Open
Polarization maps of the Vela C molecular cloud were obtained at 250, 350, and 500 μ m during the 2012 flight of the balloon-borne telescope BLASTPol. These measurements are used in conjunction with 850 μ m data from Planck to study the su…
View article
General predictions for the neutron star crustal moment of inertia Open
The neutron star crustal EoS and transition point properties are computed\nwithin a unified meta-modeling approach. A Bayesian approach is employed\nincluding two types of filters: bulk nuclear properties are controlled from low\ndensity e…
View article
Spherical conformal models for compact stars Open
\n We consider spherical exact models for compact stars with anisotropic pressures and a conformal symmetry. The conformal symmetry condition generates an integral relationship between the gravitational potentials. We solve this condition …