{
  "abstract": "Quasars are extremely luminous objects that provide insights into the physics and evolution of supermassive black holes (SMBHs) and their accretion flows, galaxy evolution, and even cosmology. In this study, we present an exploratory study based on the ongoing fifth generation of the Sloan Digital Sky Survey (SDSS-V) and its unique dual-hemisphere, wide-field, and multiobject spectroscopic capabilities, with the aim of creating a comprehensive, all-sky quasar sample. The targets were selected through two novel methods, Gaia–unWISE AGN (GUA) and Skewt_QSO, that rely primarily on data from the Wide-field Infrared Survey Explorer (WISE) and Gaia, aiming to address gaps in previous large quasar samples. Our sample includes over 250,000 spectroscopically confirmed quasars reaching to z ∼ 5, with tens of thousands of newly identified quasars in the southern hemisphere. The selection methods are highly pure, with well over 80% of the spectra collected being genuine quasars; the main contaminants are M-type stars. The detailed spectral decomposition procedure we employed shows that the quasars in the sample span a wide range of luminosities ( L bol ∼ 10 ⁴⁴ −10 ⁴⁸ erg s ⁻¹ ), SMBH masses ( M BH ∼ 10 ⁶ −10 ¹⁰ M ⊙ ), and accretion rates ( L / L Edd ∼ 0.01−1). The distributions of these properties are consistent with those of previous quasar catalogs, which are based on past generations of SDSS, once we account for potential selection biases related to the various survey depths. Our findings confirm that novel selection methods based on optical+infrared colors and/or astrometry can yield a large, high-purity quasar sample over wide sky areas, including in cases where more nuanced multiband photometry and/or multiwavelength data in the X-ray or radio are not available. This SDSS-V sample, which is expected to grow in the near future, establishes a robust reference for future southern (time-domain) surveys, while enhancing and complementing our understanding of quasar demographics and SMBH evolution.",
  "abstract_shown": true,
  "affiliations": [
    "Tel Aviv University",
    "Max-Planck-Institut für extraterrestrische Physik",
    "University of Washington",
    "University of Illinois at Urbana-Champaign",
    "The Pennsylvania State University",
    "Universidad Diego Portales",
    "Excellence Cluster ORIGINS",
    "Universidad de Tarapacá",
    "University of Utah",
    "University of Colorado",
    "Universidad Bernardo O’Higgins",
    "York University",
    "Harvard-Smithsonian Center for Astrophysics",
    "Space Telescope Science Institute",
    "University of Geneva",
    "Peking University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 25,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Shir Aviram",
      "orcid": "0009-0008-0046-8064"
    },
    {
      "affs": [
        0
      ],
      "name": "Benny Trakhtenbrot",
      "orcid": "0000-0002-3683-7297"
    },
    {
      "affs": [
        1
      ],
      "name": "Tom Dwelly",
      "orcid": "0000-0002-4459-9233"
    },
    {
      "affs": [
        2
      ],
      "name": "Scott F. Anderson",
      "orcid": "0000-0002-6404-9562"
    },
    {
      "affs": [
        3
      ],
      "name": "Sean Morrison",
      "orcid": "0000-0002-6770-2627"
    },
    {
      "affs": [
        4
      ],
      "name": "Michael Eracleous",
      "orcid": "0000-0002-3719-940X"
    },
    {
      "affs": [
        3
      ],
      "name": "Yue Shen",
      "orcid": "0000-0003-1659-7035"
    },
    {
      "affs": [
        1
      ],
      "name": "Mara Salvato",
      "orcid": "0000-0001-7116-9303"
    },
    {
      "affs": [
        4
      ],
      "name": "Donald P. Schneider",
      "orcid": "0000-0001-7240-7449"
    },
    {
      "affs": [
        5
      ],
      "name": "Roberto J. Assef",
      "orcid": "0000-0002-9508-3667"
    },
    {
      "affs": [
        1,
        6
      ],
      "name": "Catarina Aydar",
      "orcid": "0000-0001-5609-2774"
    },
    {
      "affs": [
        7
      ],
      "name": "Franz E. Bauer",
      "orcid": "0000-0002-8686-8737"
    },
    {
      "affs": [
        4
      ],
      "name": "W. N. Brandt",
      "orcid": "0000-0002-0167-2453"
    },
    {
      "affs": [
        8
      ],
      "name": "Joel R. Brownstein",
      "orcid": "0000-0002-8725-1069"
    },
    {
      "affs": [
        1
      ],
      "name": "Johannes Buchner",
      "orcid": "0000-0003-0426-6634"
    },
    {
      "affs": [
        9
      ],
      "name": "Jeremy Darling",
      "orcid": "0000-0003-2511-2060"
    },
    {
      "affs": [
        10
      ],
      "name": "José G. Fernández-Trincado",
      "orcid": "0000-0002-0900-9760"
    },
    {
      "affs": [
        11
      ],
      "name": "Patrick B. Hall",
      "orcid": "0000-0002-1763-5825"
    },
    {
      "affs": [
        12
      ],
      "name": "Dong-Woo Kim",
      "orcid": "0000-0002-7386-944X"
    },
    {
      "affs": [
        13
      ],
      "name": "Anton M. Koekemoer",
      "orcid": "0000-0002-6610-2048"
    },
    {
      "affs": [
        13
      ],
      "name": "Stephanie LaMassa",
      "orcid": "0000-0002-5907-3330"
    },
    {
      "affs": [
        1
      ],
      "name": "Andrea Merloni",
      "orcid": "0000-0002-0761-0130"
    },
    {
      "affs": [
        5,
        14,
        15
      ],
      "name": "Claudio Ricci",
      "orcid": "0000-0001-5231-2645"
    },
    {
      "affs": [
        12
      ],
      "name": "Qian Yang",
      "orcid": "0000-0002-6893-3742"
    },
    {
      "affs": [
        0
      ],
      "name": "Grisha Zeltyn",
      "orcid": "0000-0002-7817-0099"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8dsq1r6njre5q.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea57b",
  "fulltext_url": null,
  "id": "8dsq1r6njre5q",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea57b",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
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  "openalex": "W7171971946",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea57b/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/8dsq1r6njre5q.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea57b",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea57b"
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  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Galaxies: Formation, Evolution, Phenomena",
      "subfield": "galaxies"
    }
  ],
  "title": "An Exploratory Analysis of New Large Gaia-informed Quasar Samples in SDSS-V",
  "title_text": "An Exploratory Analysis of New Large Gaia-informed Quasar Samples in SDSS-V",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/8dsq1r6njre5q",
  "venue": "The Astrophysical Journal",
  "versions": []
}