38 citations · 368 across the 34 of their papers we have counts for
19 papers · 1 filter
Double White Dwarf Mergers as Progenitors of Long-Period Transients
Manuel Malheiro, Sarah V. Borges, Jaziel G. Coelho +6
There is an ongoing discussion in the literature on the nature of long-period transients (LPTs), radio-emitting sources with periods ranging from hundreds to tens of thousands of s…
Binary coalescences as sources of Ultra-High Energy Cosmic Rays
Jonas P. Pereira, Carlos H. Coimbra-Araújo, Rita C. dos Anjos +1
Binary coalescences are known sources of gravitational waves (GWs) and they encompass combinations of black holes (BHs) and neutron stars (NSs). Here we show that when BHs are embe…
Evidence for 3XMM J185246.6+003317 as a massive magnetar with a low magnetic field
Rafael C. R. de Lima, Jonas P. Pereira, Jaziel G. Coelho +10
3XMM J185246.6+003317 is a transient magnetar located in the vicinity of the supernova remnant Kes\,79. So far, observations have only set upper limits to its surface magnetic fiel…
An updated view and perspectives on high-energy gamma-ray emission from SGR J1935+2154 and its environment
Jaziel G. Coelho, Luana N. Padilha, Rita C. dos Anjos +2
SGR J1935+2154 was discovered in 2016 and is currently one of the most burst-active Soft Gamma-ray Repeaters (SGR), having emitted several X-ray bursts in recent years. In one of o…
Origin and role of relativistic cosmic particles
A. Araudo, G. Morlino, B. Olmi +121
This white paper briefly summarizes the importance of the study of relativistic cosmic rays, both as a constituent of our Universe, and through their impact on stellar and galactic…
Multi-messenger and transient astrophysics with the Cherenkov Telescope Array
Ž. Bošnjak, A. M. Brown, A. Carosi +142
The discovery of gravitational waves, high-energy neutrinos or the very-high-energy counterpart of gamma-ray bursts has revolutionized the high-energy and transient astrophysics co…
High-energy gamma-ray emission from SNR G57.2+0.8 hosting SGR J1935+2154
Rita C. dos Anjos, Jaziel G. Coelho, Jonas P. Pereira +1
In recent years some efforts have been made to identify active sources capable of accelerating particles up to eV, known as PeVatrons. Measurements of TeV ( eV)…
Observational Constraints on the Pulsar Wind Model: The Cases of Crab and Vela
Jaziel G. Coelho, José C. N. de Araujo, Samantha M. Ladislau +1
As is well known, pulsars are extremely stable rotators. However, although slowly, they spin down thanks to brake mechanisms, which are in fact still subject of intense investigati…
Weighing massive neutron star with screening gravity: A look on PSR J0740+6620 and GW190814 secondary component
Rafael C. Nunes, Jaziel G. Coelho, José C. N. de Araujo
Neutron stars (NSs) are excellent natural laboratories to constrain gravity on strong field regime and nuclear matter in extreme conditions. Motivated by the recent discovery of a…
A magnetic white-dwarf accretion model for the anomalous X-ray pulsar 4U 0142+61
Sarah V. Borges, Claudia V. Rodrigues, Jaziel G. Coelho +2
The quiescent emission of the anomalous X-ray pulsar (AXP) 4U 0142+61 extends over a broad range of energy, from radio up to hard X-rays. In particular, this object is unique among…
Gravitational Waves From Pulsars Due To Their Magnetic Ellipticity
José C. N. de Araujo, Jaziel G. Coelho, Samantha M. Ladislau +1
We discuss some aspects of de Araujo, Coelho & Costa (2016, 2017) concerning the role of a time dependent magnetic ellipticity on the pulsars' braking indices and on the putative g…
Born-Infeld magnetars: larger production of gravitational waves due to larger toroidal magnetic fields
Jonas P. Pereira, Jaziel G. Coelho, Rafael C. R. de Lima
We discuss some aspects of Pereira et al. (2018) concerning magnetars described by nonlinear theories of the electromagnetism and make the case for the Born-Infeld Lagrangian. We f…
Ultra-high energy cosmic rays from white dwarf pulsars and the Hillas criterion
Ronaldo V. Lobato, Jaziel G. Coelho, M. Malheiro
The sources of ultra-high-energy cosmic rays ( eV) is still an open question in astroparticle physics and in the last years some efforts were made to understand it…
On the nature of some SGRs and AXPs as rotation-powered neutron stars
Jaziel G. Coelho, D. L. Cáceres, R. C. R. de Lima +3
We investigate the possibility that some SGRs/AXPs could be canonical rotation-powered pulsars using realistic NS structure parameters instead of fiducial values. We show that real…
Thermal X-ray emission from massive, fast rotating, highly magnetized white dwarfs
D. L. Caceres, S. M. de Carvalho, J. G. Coelho +2
There is solid observational evidence on the existence of massive, , highly magnetized white dwarfs (WDs) with surface magnetic fields up to G. We sho…
Gravitational Waves from Pulsars and Their Braking Indices: The Role of a Time Dependent Magnetic Ellipticity
José C. N. de Araujo, Jaziel G. Coelho, César A. Costa
We study the role of time dependent magnetic ellipticities () on the calculation of the braking index of pulsars. Moreover, we study the consequences of such a on th…
Gravitational waves from pulsars with measured braking index
Jose C. N. de Araujo, Jaziel G. Coelho, Cesar A. Costa
We study the putative emission of gravitational waves (GWs) in particular for pulsars with measured braking index. We show that the appropriate combination of both GW emission and…
The influence of quantum vacuum friction on pulsars
Jaziel G. Coelho, Jonas P. Pereira, José C. N. de Araujo
We firstly revisit the energy loss mechanism known as quantum vacuum friction (QVF), clarifying some of its subtleties. Then we investigate the observables that could easily differ…
Magnetars and White Dwarf Pulsars
Ronaldo V. Lobato, Manuel Malheiro, Jaziel G. Coelho
The Anomalous X-ray Pulsars (AXPs) and Soft Gamma-ray Repeaters (SGRs) are a class of pulsars understood as neutron stars (NSs) with super strong surface magnetic fields, namely $B…