Expectations for time-delay measurements in active galactic nuclei with the Vera Rubin Observatory

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F23%3A00131518" target="_blank" >RIV/00216224:14310/23:00131518 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1051/0004-6361/202345844" target="_blank" >https://doi.org/10.1051/0004-6361/202345844</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202345844" target="_blank" >10.1051/0004-6361/202345844</a>

Result language

angličtina

Original language name

Expectations for time-delay measurements in active galactic nuclei with the Vera Rubin Observatory

Original language description

Context. The Vera Rubin Observatory will provide an unprecedented set of time-dependent observations of the sky. The planned Legacy Survey of Space and Time (LSST), operating for ten years, will provide dense light curves for thousands of active galactic nuclei (AGN) in deep drilling fields (DDFs) and less dense light curves for millions of AGN from the main survey (MS). Aims. We model the prospects for measuring the time delays for the AGN emission lines with respect to the continuum, using these data. Methods. We modeled the artificial light curves using the Timmer-Konig algorithm. We used the exemplary cadence to sample them (one for the MS and one for the DDF), we supplement light curves with the expected contamination by the strong emission lines (H &amp; beta;, Mg II, and CIV, as well as with Fe II pseudo-continuum and the starlight). We chose suitable photometric bands that are appropriate for the redshift and compared the assumed line time-delay with the recovered time delay for 100 statistical realizations of the light curves. Results. We show that time delays for emission lines can be well measured from the main survey for the bright tail of the quasar distribution (about 15% of all sources) with an accuracy within 1 &amp; sigma; error. For the DDF, the results for fainter quasars are also reliable when the entire ten years of data are used. There are also some prospects to measure the time delays for the faintest quasars at the lowest redshifts from the first two years of data, and possibly even from the first season. The entire quasar population will allow us to obtain results of apparently high accuracy, but in our simulations, we see a systematic offset between the assumed and recovered time delay that depends on the redshift and source luminosity. This offset will not disappear even in the case of large statistics. This problem might affect the slope of the radius-luminosity relation and cosmological applications of quasars if no simulations are performed that correct for these effects.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GF23-04053L" target="_blank" >GF23-04053L: Weather effects in using disk continuum time delays in active galactic nuclei to measure the expansion rate of the Universe</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy and Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

675

Issue of the periodical within the volume

July

Country of publishing house

FR - FRANCE

Number of pages

20

Pages from-to

1-20

UT code for WoS article

001034545500008

EID of the result in the Scopus database

2-s2.0-85166354546