Blazar variability with the Vera C. Rubin Legacy Survey of Space and Time (LSST)

Abstract

With their emission mainly coming from a relativistic jet pointing towards us, blazars are fundamental sources to study extragalactic jets and their central engines, consisting of supermassive black holes (SMBHs) fed by accretion discs. They are also candidate sources of high-energy neutrinos and cosmic rays. Because of the jet orientation, the non-thermal blazar emission is Doppler beamed; its variability is unpredictable and occurs on time-scales from less than one hour to years. The comprehension of the diverse mechanisms producing the flux and spectral changes requires well-sampled multiband light curves on long time periods. In particular, outbursts are the best test bench to shed light on the underlying physics, especially when studied in a multiwavelength context. The Vera C. Rubin Legacy Survey of Space and Time (Rubin-LSST) will monitor the southern sky for ten years in six photometric bands, offering a formidable tool to study blazar variability features in a statistical way. The alert system will allow us to trigger follow-up observations of outstanding events, especially at high (keV-to-GeV) and very high (TeV) energies. We here examine the simulated Rubin-LSST survey strategies with the aim of understanding which cadences are more suitable for the blazar variability science. Our metrics include light curve and colour sampling. We also investigate the problem of saturation, which will affect the brightest and many flaring sources, and will have a detrimental impact on follow-up observations.

arXiv comment18 pages, 12 figures, accepted for publication in the ApJS Rubin Cadence Focus Issue

References in corpus (39)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• Fermi Large Area Telescope Fourth Source Catalog
• Multi-messenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A
• Neutrino emission from the direction of the blazar TXS 0506+056 prior to the IceCube-170922A alert
• The eROSITA X-ray telescope on SRG
• Leptonic and Hadronic Modeling of Fermi-Detected Blazars
• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• Optical and Radio Properties of Extragalactic Sources Observed by the FIRST and SDSS Surveys
• CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
• Roma-BZCAT: A multifrequency catalogue of Blazars
• The 5th edition of the Roma-BZCAT. A short presentation
• 2FHL: The Second Catalog of Hard Fermi-LAT Sources
• The Radio-Loud Fraction of Quasars is a Strong Function of Redshift and Optical Luminosity
• Science with the Cherenkov Telescope Array
• Blazars as Ultra-High-Energy Cosmic-Ray Sources: Implications for TeV Gamma-Ray Observations
• Blazar spectral variability as explained by a twisting inhomogeneous jet
• The unprecedented optical outburst of the quasar 3C 454.3. The WEBT campaign of 2004-2005
• The WEBT BL Lac Campaign 2000
• Optimal Time-Series Selection of Quasars
• Optimization of the Observing Cadence for the Rubin Observatory Legacy Survey of Space and Time: a pioneering process of community-focused experimental design
• The Outburst of the Blazar S5 0716+71 in 2011 October: Shock in a Helical Jet
• Dissecting the regions around IceCube high-energy neutrinos: growing evidence for the blazar connection
• A new activity phase of the blazar 3C 454.3. Multifrequency observations by the WEBT and XMM-Newton in 2007-2008
• The first blazar observed at z>6
• The radio delay of the exceptional 3C 454.3 outburst. Follow-up WEBT observations in 2005-2006
• The GASP-WEBT monitoring of 3C 454.3 during the 2008 optical-to-radio and gamma-ray outburst
• The long-lasting activity of 3C 454.3. GASP-WEBT and satellite observations in 2008-2010
• The high activity of 3C 454.3 in autumn 2007. Monitoring by the WEBT during the AGILE detection
• Kink-driven magnetic reconnection in relativistic jets: consequences for X-ray polarimetry of BL Lacs
• Multiwavelength Variability Signatures of Relativistic Shocks in Blazar Jets
• Mean and Extreme Radio Properties of Quasars and the Origin of Radio Emission
• The dual nature of blazar fast variability. Space and ground observations of S5 0716+714
• Photometric Reverberation Mapping of the Broad Emission Line Region in Quasars
• The complex variability of blazars: Time-scales and periodicity analysis in S4 0954+65
• Polarimetric Properties of Blazars Caught by the WEBT
• The fraction of BL Lac objects in groups of galaxies
• Do BL Lac Objects and FR I radiogalaxies inhabit the same galaxy environment?

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