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| = AGN Variability interest group = [[EroAgn|Back to the eROSITA AGN working group]] The purpose of this page is to serve as a data exchange for a loose groups of people interested in AGN variability, both spectral and flux. For non-AGN & TDE, see [[eroTDA_ScienceProjects|TDA Science Projects]]. == People interested == * Johannes Buchner * Mirko Krumpe * Gabriele Ponti (TBC, not in AGN WG anymore according to [[EroAgn]]?) * Joern Wilms (TBC) Please add your name! :) == Ideas for projects & papers == Add ideas, information and names where you are interested, so we can communicate and work together. This is still all in the pre-WG approval phase, so nothing is set in stone (e.g., w.r.t. leading projects). Mostly this is a collection of ideas. * Blazar luminosity variability: * Science goals: Constraining jet models [[TDA_Projects_Wilms-blazarJets]] * People interested: Joern Wilms (TBC), ... * Data requirements: needs ...? * Occultation on 6m-year timescales (absorption/spectral variability) * Science goals: listed below * People interested: * JohannesBuchner (statistical inference on torus/BLR granularity) * MirkoKrumpe (statistical inference on torus/BLR granularity, follow-up of behaviour of individual events for in-depth understanding, ...) * Data requirements: * needs second all-sky survey * possibly first results can be done comparing to archives (RASS, 3XMM, CSC) * needs >10,000 sources, so small areas (<10 square degrees) are not effective. * Occultation on day timescales (scanning stripe overlaps) * Science goals: * People interested: * MirkoKrumpe * ... * Data requirements: eRASS, eFEDS also ok? * Extreme increases in AGN luminosity * Science goals: a factor of 100x luminosity increase ("turn-on") enables dust reverberation mapping, i.e. constraining the torus geometry if followed up with infrared campaigns * People interested: * ... * Data requirements: * needs second all-sky survey, possibly first results can be done comparing to archives (RASS, 3XMM, CSC) * Extreme decreases in AGN luminosity * Science goals: a factor of 100x luminosity decreases ("turn-off") allow constraining the torus geometry through a clean view of the X-ray reflection spectrum. Requires follow-up with hard X-rays (NuSTAR), thus limited to (previously) bright sources. * People interested: * JohannesBuchner * MirkoKrumpe * ... * Data requirements: * probably needs second all-sky survey to identify rapid decreases * Tidal Disruption Events * see [[eroTDA_ScienceProjects]] * flux variability as Black hole mass estimator & as standard candles * see [[AGN_flux_variability]] * People interested: * Gabriele Ponti * Andrea Merloni * Kirpal Nandra * Barbara DeMarco * ... There is also [[eRosita/AGN_spectral_variability]], feel free to integrate that here as specific science projects. == Work Products == * Johannes Buchner: [[attachment:JohannesBuchner_occultation_proposal.pdf| MC Proposal]] for constraining torus granularity with 180d-2y eROSITA cadences (bright AGN) and CDF-S with advanced statistical methods (faint AGN). Feasibility calculations and predictions for eRASS begin at the bottom of page 3: * 13,000 hard-band detected AGN in the extragalactic sky * measure NH in soft band (more sensitive), every 6 months * expect 120-1,200 of the 13,000 AGN to show eclipse events after waiting 6 months * with that, can constrain obscurer granularity (see figure); * redshifts/BHM not needed initially, but will be useful later to divide by source type * Further divisions by strength of NH variation * Mirko Krumpe: ... |