A5076371729- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- High-pressure geophysics and materials
- Astronomy and Astrophysical Research
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Space Science and Extraterrestrial Life
- Geophysics and Sensor Technology
- Infrared Target Detection Methodologies
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Scientific Measurement and Uncertainty Evaluation
- International Science and Diplomacy
Linköping University
2024
Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
2014-2021
University of Insubria
2014-2019
We present multi-wavelength observations of the unassociated γ-ray source 3FGL J2039.6−5618 detected by Fermi Large Area Telescope. The properties suggest that it is a pulsar, most likely millisecond for which neither radio nor pulsations have been detected. observed with XMM-Newton and discovered several candidate X-ray counterparts within/close to error box. brightest these sources variable period 0.2245 ± 0.0081 days. Its spectrum can be described power law photon index ΓX = 1.36 0.09,...
We present the first detection of an X-ray flare from ultracool dwarf spectral class L. The event was identified in EXTraS database XMM-Newton variable sources, and its optical counterpart, J0331−27, found through a cross-match with Dark Energy Survey Year 3 release. Next to earlier four-photon Kelu-1, J0331−27 is only second L detected X-rays, much more distant than other dwarfs detections (photometric distance 240 pc). From spectrum VIMOS instrument at VLT, we determine type be L1. has...
Temporal variability in flux and spectral shape is ubiquitous the X-ray sky carries crucial information about nature emission physics of sources. The EPIC instrument on board XMM-Newton observatory most powerful tool for studying even faint Each day, it collects a large amount hundreds new serendipitous sources, but resulting huge (and growing) dataset largely unexplored time domain. project called Exploring transient variable (EXTraS) systematically extracted all temporal domain archive....
We have analyzed the new deep XMM-Newton and Chandra observations of energetic, radio-quiet pulsar J1813−1246. The X-ray spectrum is nonthermal, very hard, absorbed. Based on spectral considerations, we propose that J1813 located at a distance further than 2.5 kpc. highly pulsed in domain, with light curve characterized by two sharp, asymmetrical peaks, separated 0.5 phase. detected no significant changes during extended available Fermi ephemeris to five years. found glitches. γ-ray phase,...
We analyzed a deep XMM-Newton observation of the radio-quiet γ-ray PSR J2055+2539. The spectrum X-ray counterpart is nonthermal, with photon index Γ = 2.36 ± 0.14 (1σ confidence). detected pulsations pulsed fraction 25% 3% and sinusoidal shape. Taking into account considerations on efficiency pulsar its spectrum, we can infer distance ranging from 450 to 750 pc. found two different nebular features associated J2055+2539 protruding it. angle between main axes ∼1628 07. main, brighter feature...
Magnetic field geometry is expected to play a fundamental role in magnetar activity. The discovery of phase-variable absorption feature the X-ray spectrum SGR 0418+5729, interpreted as cyclotron resonant scattering, suggests presence very strong non-dipolar components magnetic fields magnetars. We performed deep XMM-Newton observation pulsar 1E 2259+586, search for spectral features due intense local fields. In phase-averaged spectrum, we found evidence broad at low energy (0.7 keV). If...
The relation between magnetic activity and rotation in late-type stars provides fundamental information on stellar dynamos angular momentum evolution. Rotation-activity studies found the literature suffer from inhomogeneity measurement of indexes periods. We overcome this limitation with a study X-ray emitting, main-sequence observed by XMM-Newton Kepler . measured periods photometric variability light curves. As indicators, we adopted luminosity, number frequency white-light flares,...
X-ray emission from Young Stellar Objects (YSOs) is crucial to understand star formation. A very limited amount of results available for the protostellar (ClassI) phase. systematic search transient phenomena combined with a careful evaluation evolutionary stage offer widely unexplored window our understanding YSOs properties. Within EXTraS project, transients and variability in whole XMM-Newton archive, we discover consistent ISO-Oph 85, strongly embedded YSO rho Ophiuchi region, not...