José Luis Salto González
A5010595128- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Scientific Research and Discoveries
- Particle physics theoretical and experimental studies
- Galaxies: Formation, Evolution, Phenomena
- Planetary Science and Exploration
- Superconducting Materials and Applications
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
University of the Basque Country
2009
ABSTRACT OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in binary black hole model. The model predicted major outburst 2015 December. We found the did occur within expected time range, peaking on December 5 at magnitude 12.9 R -band. Based Swift /XRT satellite measurements and polarization data, we find it included thermal component. Its timing provides an accurate estimate for spin of primary hole, . present also...
Abstract Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission gravitational waves (GWs). We show that observations associated binary black hole (BBH) central engine blazar OJ 287 demand inclusion radiation reaction effects beyond quadrupolar order. It turns out even certain hereditary contributions to GW required predict impact flare timings 287. develop an approach incorporates this effect into BBH...
Abstract We present the results of our power spectral density analysis for BL Lac object OJ 287, utilizing Fermi -LAT survey at high-energy γ -rays, Swift -XRT in X-rays, several ground-based telescopes and Kepler satellite optical, radio GHz frequencies. The light curves are modeled terms continuous-time autoregressive moving average (CARMA) processes. Owing to inclusion data, we were able construct first time optical variability spectrum a blazar without any gaps across ∼6 dex temporal Our...
ABSTRACT The Hunting Outbursting Young Stars (HOYS) project performs long-term, optical, multifilter, high cadence monitoring of 25 nearby young clusters and star-forming regions. Utilizing Gaia DR3 data, we have identified about 17 000 potential stellar members in 45 coherent astrometric groups these fields. Twenty one them are clear or stars within 1 kpc they contain 9143 selected members. cluster distances, proper motions, membership numbers determined. We analyse long-term (≈ 7 yr) V-,...
We analyse the light curve in R band of blazar OJ287, gathered during 2015/2016 observing season. did a search for quasi-periodic oscillations (QPOs) using several methods over wide range timescales. No statistically significant periods were found high-frequency domain both ground-based data and Kepler observations. In longer-period domain, Lomb–Scargle periodogram revealed peaks above 99% significance level. The longest one—about 95 days—corresponds to innermost stable circular orbit (ISCO)...
The Hunting Outbursting Young Stars (HOYS) project performs long-term, optical, multi-filter, high cadence monitoring of 25 nearby young clusters and star forming regions. Utilising Gaia DR3 data we have identified about 17000 potential stellar members in 45 coherent astrometric groups these fields. Twenty one them are clear or stars within kiloparsec they contain 9143 selected members. cluster distances, proper motions membership numbers determined. We analyse long term (about 7yr) V, R,...
We present spot properties on 32 periodic young stellar objects in IC 5070. Long term, $\sim$5 yr, light curves the $V$, $R$, and $I$-bands are obtained through HOYS (Hunting Outbursting Young Stars) citizen science project. These dissected into six months long slices, with 3 oversampling, to measure 234 sets of amplitudes all filters. fit 180 these reliable solutions. Two thirds solutions cold spots, lowest is 2150 K below temperature. One third warm spots that above temperature by less...
ABSTRACT We present spot properties on 32 periodic young stellar objects in IC 5070. Long term, ∼5 yr, light curves the V, R, and I-bands are obtained through HOYS (Hunting Outbursting Young Stars) citizen science project. These dissected into 6 months long slices, with 3 oversampling, to measure 234 sets of amplitudes all filters. fit 180 these reliable solutions. Two thirds solutions cold spots, lowest is 2150 K below temperature. One third warm spots that above temperature by less than...