In:
Frontiers in Astronomy and Space Sciences, Frontiers Media SA, Vol. 9 ( 2022-3-7)
Abstract:
Given their extremely large distances and small apparent sizes, quasars are generally considered as objects with near-zero parallax and proper motion. However, some special quasars may have abnormal astrometric characteristics, such as quasar pairs, lensed quasars, AGNs with bright parsec-scale optical jets, which are scientifically interesting objects, such as binary black holes. These quasars may come with astrometric jitter detectable with Gaia data, or significant changes in the position at different wavelengths. In this work, we aim to find these quasar candidates from Gaia EDR3 astrometric data combining with Sloan Digital Sky Survey (SDSS) spectroscopic data to provide a candidate catalog to the science community. We propose a series of criteria for selecting abnormal quasars based on Gaia astrometric data. We obtain two catalogs containing 155 sources and 44 sources, respectively. They are potential candidates of quasar pairs.
Type of Medium:
Online Resource
ISSN:
2296-987X
DOI:
10.3389/fspas.2022.822768
DOI:
10.3389/fspas.2022.822768.s001
DOI:
10.3389/fspas.2022.822768.s002
DOI:
10.3389/fspas.2022.822768.s003
DOI:
10.3389/fspas.2022.822768.s004
DOI:
10.3389/fspas.2022.822768.s005
Language:
Unknown
Publisher:
Frontiers Media SA
Publication Date:
2022
detail.hit.zdb_id:
2778829-5
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