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      Reevaluating LSST's Capability for Time Delay Measurements in Quasar Accretion Discs

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          Abstract

          The Legacy Survey of Space and Time (LSST) at the Vera C. Rubin Observatory is poised to observe thousands of quasars using the Deep Drilling Fields (DDF) across six broadband filters over a decade. Understanding quasar accretion disc (AD) time delays is pivotal for probing the physics of these distant objects. Pozo Nu\~nez et al. (2023) has recently demonstrated the feasibility of recovering AD time delays with accuracies ranging from 5\% to 20\%, depending on the quasar's redshift and time sampling intervals. Here we reassess the potential for measuring AD time delays under the current DDF observing cadence, which is placeholder until a final cadence is decided. We find that contrary to prior expectations, achieving reliable AD time delay measurements for quasars is significantly more challenging, if not unfeasible, due to the limitations imposed by the current observational strategies.

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          Author and article information

          Journal
          14 February 2024
          Article
          10.3847/2515-5172/ad284a
          2402.10969
          8c199887-a689-4b3e-971f-bb714d7ac128

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          2024 Res. Notes AAS 8 47
          Accepted as a research note in RNAAS; 3 pages, 1 figure
          astro-ph.CO astro-ph.HE

          Cosmology & Extragalactic astrophysics,High energy astrophysical phenomena

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