Paper

{
  "raw_xml": "<entry>\n    <id>http://arxiv.org/abs/2603.12810v1</id>\n    <title>Gaia GraL X.: The GraL catalogue of gravitationally lensed quasars Matched with \\textit{Gaia} data, redshifts, and time delays</title>\n    <updated>2026-03-13T09:12:23Z</updated>\n    <link href='https://arxiv.org/abs/2603.12810v1' rel='alternate' type='text/html'/>\n    <link href='https://arxiv.org/pdf/2603.12810v1' rel='related' title='pdf' type='application/pdf'/>\n    <summary>Determining the Hubble constant tension requires alternative strategies, and multiply imaged quasars, with their intermediate redshifts, can potentially be used in this regard. We provide a currently complete catalogue of spectroscopically confirmed lensed quasars with ESA/{\\it Gaia} astrometry and photometry, as well as redshifts and time delays when available. In addition to the improved astrometry, the catalogue increases the number of lensed quasars by a factor of 1.5 (now 364, of which 277 are doubles and 87 are quads or triples) and significantly increases the number of lensing galaxies detected (now 218), which represents a major step forward. Redshifts are provided for 347 quasars and 188 deflectors. A completely new table of time delays, required for estimates of $H_0$, is presented, with 195 time delays from 73 systems. {\\it Gaia} absolute astrometry is sub-milliarcsecond and covers the entire sky. Future {\\it Gaia} data releases will provide long-term photometry, which should provide many more time delays. The catalogues as presented here enable machine-learning techniques to be trained and tested and subsequently applied to the {\\it Gaia} data releases. Finally, we derive simple but homogeneous models of the 18 quadruply imaged quasars for which images of all four components are presented in {\\it Gaia} DR3.}</summary>\n    <category scheme='http://arxiv.org/schemas/atom' term='astro-ph.GA'/>\n    <category scheme='http://arxiv.org/schemas/atom' term='astro-ph.CO'/>\n    <published>2026-03-13T09:12:23Z</published>\n    <arxiv:primary_category term='astro-ph.GA'/>\n    <author>\n      <name>C. Ducourant</name>\n    </author>\n    <author>\n      <name>R. Teixeira</name>\n    </author>\n    <author>\n      <name>P. H. Vale-Cunha</name>\n    </author>\n    <author>\n      <name>L. Delchambre</name>\n    </author>\n    <author>\n      <name>A. Krone-Martins</name>\n    </author>\n    <author>\n      <name>J. Braine</name>\n    </author>\n    <author>\n      <name>L. Galluccio</name>\n    </author>\n    <author>\n      <name>J-F. Le Campion</name>\n    </author>\n    <author>\n      <name>O. S. Krinski-Moreira</name>\n    </author>\n    <author>\n      <name>S. Scarano</name>\n    </author>\n    <author>\n      <name>C. Boehm</name>\n    </author>\n    <author>\n      <name>T. Connor</name>\n    </author>\n    <author>\n      <name>S. G. Djorgovski</name>\n    </author>\n    <author>\n      <name>M. J. Graham</name>\n    </author>\n    <author>\n      <name>P. Jalan</name>\n    </author>\n    <author>\n      <name>Q. Petit</name>\n    </author>\n    <author>\n      <name>S. A. Klioner</name>\n    </author>\n    <author>\n      <name>F. Mignard</name>\n    </author>\n    <author>\n      <name>V. Negi</name>\n    </author>\n    <author>\n      <name>J. Sebastian den Brok</name>\n    </author>\n    <author>\n      <name>I. Slezak</name>\n    </author>\n    <author>\n      <name>E. Slezak</name>\n    </author>\n    <author>\n      <name>C. Spindola-Duarte</name>\n    </author>\n    <author>\n      <name>D. Stern</name>\n    </author>\n    <author>\n      <name>J. Surdej</name>\n    </author>\n    <author>\n      <name>D. Sweeney</name>\n    </author>\n    <author>\n      <name>D. J. Walton</name>\n    </author>\n    <author>\n      <name>J. Wambsganss</name>\n    </author>\n  </entry>"
}