Quasar catalogue for the astrometric calibration of the forthcoming ILMT survey
Amit Kumar Mandal, Bikram Pradhan, Jean Surdej, C. S. Stalin, Ram, Sagar, Blesson Mathew

TL;DR
This paper presents a catalogue of 6738 quasars with precise coordinates suitable for astrometric calibration of the upcoming ILMT survey, leveraging Gaia-DR2 data to ensure accuracy and facilitate future quasar variability studies.
Contribution
The paper provides the first comprehensive quasar catalogue specifically tailored for ILMT astrometric calibration, with cross-matched Gaia-DR2 data ensuring high positional accuracy.
Findings
Catalogue contains 6738 quasars suitable for ILMT calibration.
Quasars in the ILMT stripe have proper motion < 20 mas/yr.
Quasars have parallax < 10 mas.
Abstract
Quasars are ideal targets to use for astrometric calibration of large scale astronomical surveys as they have negligible proper motion and parallax. The forthcoming 4-m International Liquid Mirror Telescope (ILMT) will survey the sky that covers a width of about 27 arcminute. To carry out astrometric calibration of the ILMT observations, we aimed to compile a list of quasars with accurate equatorial coordinates and falling in the ILMT stripe. Towards this, we cross-correlated all the quasars that are known till the present date with the sources in the Gaia-DR2 catalogue, as the Gaia-DR2 sources have position uncertainties as small as a few milli arcsec (mas). We present here the results of this cross-correlation which is a catalogue of 6738 quasars that is suitable for astrometric calibration of the ILMT fields. In this work, we present this quasar catalogue. This catalogue of quasars…
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