The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.
Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample
Open accessAbstract
We describe the algorithm for selecting quasar candidates for optical spectroscopy in the Sloan Digital Sky Survey. Quasar candidates are selected via their non-stellar colors in "ugriz" broad-band photometry, and by matching unresolved sources to the FIRST radio catalogs. The automated algorithm is sensitive to quasars at all redshifts lower than z=5.8. Extended sources are also targeted as low-redshift quasar candidates in order to investigate the evolution of Active Galactic Nuclei (AGN) at the faint end of the luminosity function. Nearly 95% of previously known quasars are recovered (based on 1540 quasars in 446 square degrees). The overall completeness, estimated from simulated quasars, is expected to be over 90%, whereas the overall efficiency (quasars:quasar candidates) is better than 65%. The selection algorithm targets ultraviolet excess quasars to i^*=19.1 and higher-redshift (z>3) quasars to i^*=20.2, yielding approximately 18 candidates per square degree. In addition to selecting ``normal'' quasars, the design of the algorithm makes it sensitive to atypical AGN such as Broad Absorption Line quasars and heavily reddened quasars.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
Schlegel, D. J., Finkbeiner, D. P., & Davis, M. (1998) · The Astrophysical Journal · doi:10.1086/305772 · Cited by 15,126
Self-citationThe Sloan Digital Sky Survey Photometric System
Fukugita, M., Ichikawa, T., Gunn, J. E., Doi, M., Shimasaku, K., & Schneider, D. P. (1996) · The Astronomical Journal · doi:10.1086/117915 · Cited by 3,033 · cited 3×
“The imaging survey is done in five broad bands, ugriz (Fukugita et al. 1996; Stoughton et al. 2002), that were specially designed for the survey.”
BackgroundMethodSelf-citationThe Sloan Digital Sky Survey Photometric Camera
Gunn, J. E., Carr, M., Rockosi, C., Sekiguchi, M., Berry, K., Elms, B., de Haas, E., Ivezić, Ž., Knapp, G., Lupton, R., et al. (1998) · The Astronomical Journal · doi:10.1086/300645 · Cited by 1,692
Self-citation
Cited by
THE SEVENTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY
Abazajian, K. N., Adelman-McCarthy, J. K., Agüeros, M. A., Allam, S. S., Prieto, C. A., An, D., Anderson, K. S. J., Anderson, S. F., Annis, J., Bahcall, N. A., et al. (2009) · The Astrophysical Journal Supplement Series · doi:10.1088/0067-0049/182/2/543 · Cited by 5,341
Self-citationLSST: From Science Drivers to Reference Design and Anticipated Data Products
Ivezić, Ž., Kahn, S. M., Tyson, J. A., Abel, B., Acosta, E., Allsman, R., Alonso, D., AlSayyad, Y., Anderson, S. F., Andrew, J., et al. (2019) · The Astrophysical Journal · doi:10.3847/1538-4357/ab042c · Cited by 4,357
“…1996) because of its demonstrated success in a wide variety of applications, including photometric redshifts of galaxies (Budavári et al. 2003), separation of stellar populations (Lenz et al. 1998; Helmi et al. 2003), and photometric selection of quasars (Richards et al. 2002; Ross et al. 2012).”
BackgroundSelf-citationThe 2.5 m Telescope of the Sloan Digital Sky Survey
Gunn, J. E., Siegmund, W. A., Mannery, E. J., Owen, R. E., Hull, C. L., Leger, R. F., Carey, L. N., Knapp, G. R., York, D. G., Boroski, W. N., et al. (2006) · The Astronomical Journal · doi:10.1086/500975 · Cited by 2,373
Self-citationSpectroscopic Target Selection in the Sloan Digital Sky Survey: The Main Galaxy Sample
Strauss, M. A., Weinberg, D. H., Lupton, R. H., Narayanan, V. K., Annis, J., Bernardi, M., Blanton, M., Burles, S., Connolly, A. J., Dalcanton, J., et al. (2002) · The Astronomical Journal · doi:10.1086/342343 · Cited by 1,909
Self-citationK -Corrections and Filter Transformations in the Ultraviolet, Optical, and Near-Infrared
Blanton, M. R., & Roweis, S. (2007) · The Astronomical Journal · doi:10.1086/510127 · Cited by 1,579
Metadata
- Authors
- Richards, G. T., Fan, X., Newberg, H. J., Strauss, M. A., Vanden Berk, D. E., Schneider, D. P., Yanny, B., Boucher, A., Burles, S., Frieman, J. A., Gunn, J. E., Hall, P. B., Ivezić, Ž., Kent, S., Loveday, J., Lupton, R. H., Rockosi, C. M., Schlegel, D. J., Stoughton, C., SubbaRao, M., & York, D. G.
- Venue
- The Astronomical Journal
- Publisher
- American Astronomical Society
- Published
- 2002-06
- Volume
- 123
- Issue
- 6
- Pages
- 2945-2975
- ISSN
- 0004-6256 (ISSN-L)
- 1538-3881
- OpenAlex
- W2037502800
- Cited by
- 1,003
- References
- 3
- FWCI
- 34.91
- Type
- journal article
- Language
- en
- Open access
- green
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample. https://app.cochat.ai/papers/10.1086/340187
- The paper
- Richards, G. T., Fan, X., Newberg, H. J., Strauss, M. A., Vanden Berk, D. E., Schneider, D. P., Yanny, B., Boucher, A., Burles, S., Frieman, J. A., Gunn, J. E., Hall, P. B., Ivezić, Ž., Kent, S., Loveday, J., Lupton, R. H., Rockosi, C. M., Schlegel, D. J., Stoughton, C., . . . York, D. G. (2002). Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample. The Astronomical Journal. https://doi.org/10.1086/340187
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.