A5037134174- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- High-pressure geophysics and materials
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Geophysics and Sensor Technology
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- earthquake and tectonic studies
- Mechanics and Biomechanics Studies
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Solar and Space Plasma Dynamics
- Particle Detector Development and Performance
- Advanced Semiconductor Detectors and Materials
- Spectroscopy and Laser Applications
- Inertial Sensor and Navigation
- Astrophysics and Star Formation Studies
- Earthquake Detection and Analysis
- X-ray Spectroscopy and Fluorescence Analysis
- Space Technology and Applications
- Geophysics and Gravity Measurements
Institute of Space Sciences
2019-2024
Universidad de La Laguna
2023-2024
Instituto de Astrofísica de Canarias
2023-2024
Institut d'Estudis Espacials de Catalunya
2019-2023
Institució Catalana de Recerca i Estudis Avançats
2023
University of Amsterdam
2014-2021
Netherlands Institute for Radio Astronomy
2021
Chalmers University of Technology
2021
Joint Institute for VLBI ERIC
2021
The Netherlands Cancer Institute
2017
ABSTRACT The 6.67 hr periodicity and the variable X-ray flux of central compact object (CCO) at center supernova remnant RCW 103, named 1E 161348–5055, have been always difficult to interpret within standard scenarios an isolated neutron star (NS) or a binary system. On 2016 June 22, Burst Alert Telescope (BAT) on board Swift detected magnetar-like short burst from direction also coincident with large long-term outburst. Here, we report Chandra , Nuclear Spectroscopic Array (BAT XRT)...
Abstract The Cherenkov Telescope Array (CTA) is a next-generation ground-based observatory for gamma-ray astronomy at very high energies. Large-Sized prototype (LST-1) located the CTA-North site, on Canary Island of La Palma. LSTs are designed to provide optimal performance in lowest part energy range covered by CTA, down ≃20 GeV. LST-1 started performing astronomical observations 2019 November, during its commissioning phase, and it has been taking data ever since. We present first Crab...
Ultracompact X-ray binaries (UCXBs) are a distinctive but elusive family of low-mass (LMXBs) characterised by their tight orbits and degenerate donor stars. Here we present UltraCompCAT, the first online comprehensive catalogue UCXBs. The initial version UltraCompCAT comprises 49 sources, including 20 confirmed UCXBs (those with measured orbital period shorter than 80 min) 25 systems that label ‘candidates’ based on multi-wavelength phenomenology. For completeness, also include four LMXBs...
Abstract Recently, the Galactic magnetar SGR J1935+2154 has garnered attention due to its emission of an extremely luminous radio burst, reminiscent fast bursts (FRBs). is one most active magnetars, displaying flaring events nearly every year, including outbursts as well short and intermediate bursts. Here, we present our results on properties persistent bursting X-ray from during initial weeks following outburst 2022 October 10. The source was observed with XMM-Newton NuSTAR...
We observed the periodic radio transient GLEAM-X J162759.5-523504.3 (GLEAM-X J1627) using Chandra X-ray Observatory for about 30-ks on January 22-23, 2022, simultaneously with observations from MWA, MeerKAT and ATCA. Its emission 18-min periodicity led source to be tentatively interpreted as an extreme magnetar or a peculiar highly magnetic white dwarf. The was not detected in 0.3-8 keV energy range 3-sigma upper-limit count rate of 3x10^{-4} counts/s. No during our either. Furthermore, we...
We report on the results of a detailed phase-resolved spectroscopy archival XMM--Newton observations X-ray Dim Isolated Neutron Stars (XDINSs). Our analysis revealed narrow and phase-variable absorption feature in spectrum RX J1308.6+2127. The has an energy $\sim$740 eV equivalent width $\sim$15 eV. It is detected only $\sim$ 1/5 phase cycle, appears to be present for entire timespan covered by (2001 December - 2007 June). strong dependence pulsar rotation suggest that likely due resonant...
We present the discovery of a strongly phase-variable absorption feature in X-ray spectrum nearby, thermally emitting, isolated neutron star RX J0720.4–3125. The line was detected performing detailed phase-resolved spectroscopy 20 XMM-Newton observations, covering period 2000 May–2012 September. has an energy ∼750 eV, equivalent width ∼30 and it is significantly for only ∼20% pulsar rotation. appears to be stable over timespan covered by observations. Given its strong dependence on...
We report on 3.5 years of Chandra monitoring the Galactic Centre magnetar SGR J1745-2900 since its outburst onset in April 2013. The spin-down has shown at least two episodes period derivative increases so far, and it slowed down regularly past year or so. observed a slightly increasing trend time evolution pulsed fraction, up to about 55 per cent most recent observations. not reached quiescent level yet, far overall can be interpreted terms cooling hot region star surface. discuss possible...
Abstract The magnetar Swift J1818.0–1607 was discovered in 2020 March when detected a 9 ms hard X-ray burst and long-lived outburst. Prompt observations revealed spin period of 1.36 s, soon confirmed by the discovery radio pulsations. We report here on analysis follow-up observations. average luminosity L ∼ 2 × 10 39 erg s −1 (at 4.8 kpc). Simultaneous with XMM-Newton NuSTAR three days after provided source spectrum well fit an absorbed blackbody ( = (1.13 ± 0.03) 23 cm −2 kT 1.16 0.03 keV)...
In search for the counterpart to Fermi-LAT source 3FGL J0838.8-2829, we performed a multi-wavelength campaign, in X-ray band with Swift and XMM-Newton, infrared, optical (with OAGH, ESO-NTT IAC80) radio (ATCA) observations, as well analysed archival hard data taken by INTEGRAL. We report on three sources consistent position of source. confirm identification brightest object, RX J0838-2827, magnetic cataclysmic variable, that recognize an asynchronous system (not associated source). is...
Abstract A few years after its discovery as a magnetar, SGR J1935+2154 started new burst-active phase on 2020 April 27, accompanied by large enhancement of X-ray persistent emission. Radio single bursts were detected during this activation, strengthening the connection between magnetars and fast radio bursts. We report monitoring from ∼3 days prior to weeks reactivation, using Swift, Nuclear Spectroscopic Telescope Array (NuSTAR), Neutron Star Interior Composition Explorer (NICER)....
After 15 years, in late 2018, the magnetar XTE J1810-197 underwent a second recorded X-ray outburst event and reactivated as radio pulsar. We initiated an monitoring campaign to follow timing spectral evolution of its flux decays using Swift, XMM-Newton, NuSTAR, NICER observations. During year-long campaign, reproduced similar behaviour that found for first outburst, with factor two change spin-down rate from $\sim7.2\times10^{-12}$ s s$^{-1}$ $\sim1.5\times10^{-11}$ after months. Unique...
The magnetar SGR J1935+2154 underwent a new active episode on 2020 April 27-28, when forest of hundreds X-ray bursts and large enhancement the persistent flux were detected. For first time, radio burst with properties similar to those fast counterpart was observed from this source, showing that magnetars can power at least group bursts. In paper, we report spectral timing based long-term monitoring campaign Chandra, XMM-Newton, NuSTAR, Swift NICER covering time span ~7 months since outburst...
We present the evolution of X-ray emission properties magnetar 1E 1547.0-5408 since February 2004 over a time period covering three outbursts. analyzed new and archival observations taken with Swift, NuSTAR, Chandra XMM-Newton satellites. The source has been observed at relatively steady soft flux $\approx$ 10$^{-11}$ erg cm$^{-2}$ s$^{-1}$ (0.3-10 keV) last 9 years, which is about an order magnitude fainter than peak outburst in 2009, but factor $\sim$ 30 larger level 2006. broad-band...
Magnetar-like activity has been observed in a large variety of neutron stars. PSR J1846-0258 is young 327 ms radio-quiet pulsar with rotational power ($\sim 8 \times 10^{36}$ erg s$^{-1}$), and resides at the center supernova remnant Kes 75. It one rare examples high magnetic field showing characteristics both magnetars radio pulsars, can thus provide important clues on differences emission mechanisms between these two classes. In 2006, was detected to undergo an outburst for first time,...
Abstract Magnetar-like activity has been observed in a large variety of neutron stars. PSR J1846−0258 is young 327 ms radio-quiet pulsar with rotational power (∼8 × 10 36 erg s −1 ), and resides at the center supernova remnant Kes 75. It one rare examples high-magnetic-field showing characteristics both magnetars radio pulsars, can thus provide important clues on differences emission mechanisms between these two classes. In 2006, was detected to undergo an outburst for first time,...
We report on a new NuSTAR observation and the ongoing Swift XRT monitoring campaign of peculiar source 1E 161348-5055, located at centre supernova remnant RCW 103, which is recovering from its last outburst in June 2016. The X-ray spectrum epoch can be described by either two absorbed blackbodies ($kT_{BB_1}$ ~ 0.5 keV, $kT_{BB_2}$ 1.2 keV) or an blackbody plus power law 0.6 $\Gamma$ 3.9). observed flux was 9 $\times$ 10$^{-12}$ erg s$^{-1}$ cm$^{-2}$, 3 times lower than what onset, but...
Swift J1818.0-1607 is a radio-loud magnetar with spin period of 1.36 s and dipolar magnetic field strength B~3E14 G, which very young compared to the Galactic pulsar population. We report here on long-term X-ray monitoring campaign this using XMM-Newton, NuSTAR, from activation its first outburst in March 2020 until October 2021, as well INTEGRAL upper limits hard emission. The 1-10 keV spectrum modeled by an absorbed blackbody temperature kT_BB~1.1 keV, apparent reduction radius emitting...
We observed the slowly revolving pulsar 1E 161348-5055 (1E 1613, spin period of 6.67 h) in supernova remnant RCW 103 twice with XMM-Newton and once Very Large Telescope (VLT). The VLT observation was performed on 2016 June 30, about a week after detection large outburst from 1613. At position we found near-infrared source K_S = 20.68 +/- 0.12 mag that not detected (K_S > 21.2 mag) data collected same instruments 2006, during X-ray quiescence. Its behavior are consistent counterpart...
Abstract The magnetar SGR J1745−2900, discovered at a distance of parsecs from the Milky Way central black hole, Sagittarius A ⋆ , represents closest pulsar to supermassive hole ever detected. Furthermore, its intriguing radio emission has been used study environment as well derive precise position and proper motion for this object. discovery J1745−2900 led interesting debates about number, age, nature pulsars expected in Galactic center region. In work, we present extensive X-ray monitoring...
ABSTRACT We report on the first simultaneous high-time resolution X-ray and infrared (IR) observations of a neutron star low mass binary in its hard state. performed $\approx 2\,$ h 4U 1728−34 using HAWK-I@VLT, XMM–Newton, NuSTAR. The source displayed significant IR variability down to sub-second time-scales. By measuring cross-correlation function between lightcurves, we discovered correlation with an lead 30 \!-\! 40\,$ ms respect X-rays. analysed energy dependence lag, finding marginal...
After two major outbursts in 2006 and 2011, on 2017 May 16 the magnetar CXOU J164710.2-455216, hosted within massive star cluster Westerlund I, emitted a short (20 ms) burst, which marked onset of new active phase. We started long-term monitoring campaign with Swift (45 observations), Chandra (5 observations) NuSTAR (4 from activation until 2018 April. During campaign, BAT registered occurrence multiple bursts, accompanied by other enhancements X-ray persistent flux. The long time span...
The recurrent symbiotic nova RS Ophiuchi experienced an outburst in August 2021 that was detected at optical and high-energy gamma rays. This triggered follow-up observations of the source very-high-energy rays with first Large Size Telescope (LST-1) Cherenkov Array. observed for several nights after it clearly by LST-1. Here we report on outcomes this observation campaign ever very high energies.
Ultracompact X-ray binaries (UCXBs) are a distinctive but elusive family of low-mass (LMXBs) characterised by their tight orbits and degenerate donor stars. Here we present UltraCompCAT, the first online comprehensive catalogue UCXBs. The initial version UltraCompCAT comprises 49 sources, including 20 'confirmed' UCXBs (those with measured orbital period shorter than 80 min) 25 systems that label as 'candidate' based on multi-wavelength phenomenology. For completeness, also include four...