Wise detections of known QSOs at redshifts greater than six

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dc.contributor.authorBlain, Andrew W
dc.contributor.authorAssef, Roberto
dc.contributor.authorStern, Daniel
dc.contributor.authorTsai, Chao-Wei
dc.contributor.authorEisenhardt, Peter
dc.contributor.authorBridge, Carrie
dc.contributor.authorBenford, Dominic
dc.contributor.authorJarrett, Tom
dc.contributor.authorCutri, Roc
dc.contributor.authorPetty, Sara
dc.contributor.authorWu, Jingwen
dc.contributor.authorWright, Edward L
dc.date.accessioned2021-10-08T07:20:39Z
dc.date.available2021-10-08T07:20:39Z
dc.date.issued2013
dc.description.abstractWe present WISE All-Sky mid-infrared (IR) survey detections of 55% (17/31) of the known QSOs at z > 6 from a range of surveys: the SDSS, the CFHT-LS, FIRST, Spitzer, and UKIDSS. The WISE catalog thus provides a substantial increase in the quantity of IR data available for these sources: 17 are detected in the WISE W1 (3.4 mu m) band, 16 in W2 (4.6 mu m), 3 in W3 (12 mu m), and 0 in W4 (22 mu m). This is particularly important with Spitzer in its warm-mission phase and no faint follow-up capability at wavelengths longward of 5 mu m until the launch of James Webb Space Telescope (JWST). WISE thus provides a useful tool for understanding QSOs found in forthcoming large-area optical/IR sky surveys using PanSTARRS, SkyMapper, VISTA, DES, and LSST. The rest-UV properties of the WISE-detected and the WISE-non-detected samples differ: the detections have brighter i/z-band magnitudes and redder rest-UV colors. This suggests that a more aggressive hunt for very high redshift QSOs by combining WISE W1 and W2 data with red, observed optical colors could be effective at least for a subset of dusty candidate QSOs. Stacking the WISE images of the WISE-non-detected QSOs indicates that they are, on average, significantly fainter than the WISE-detected examples, and are thus not narrowly missing detection in the WISE catalog. The WISE catalog detection of three of our sample in the W3 band indicates that their mid-IR flux can be detected individually, although there is no stacked W3 detection of sources detected in W1 but not W3. Stacking analyses of WISE data for large active galactic nucleus samples will be a useful tool, and high-redshift QSOs of all types will be easy targets for JWST.
dc.identifier.apacitationBlain, A. W., Assef, R., Stern, D., Tsai, C., Eisenhardt, P., Bridge, C., ... Wright, E. L. (2013). Wise detections of known QSOs at redshifts greater than six. <i>The Astrophysical Journal</i>, 778(2), 113 - 177. http://hdl.handle.net/11427/34976en_ZA
dc.identifier.chicagocitationBlain, Andrew W, Roberto Assef, Daniel Stern, Chao-Wei Tsai, Peter Eisenhardt, Carrie Bridge, Dominic Benford, et al "Wise detections of known QSOs at redshifts greater than six." <i>The Astrophysical Journal</i> 778, 2. (2013): 113 - 177. http://hdl.handle.net/11427/34976en_ZA
dc.identifier.citationBlain, A.W., Assef, R., Stern, D., Tsai, C., Eisenhardt, P., Bridge, C., Benford, D. & Jarrett, T. et al. 2013. Wise detections of known QSOs at redshifts greater than six. <i>The Astrophysical Journal.</i> 778(2):113 - 177. http://hdl.handle.net/11427/34976en_ZA
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.ris TY - Journal Article AU - Blain, Andrew W AU - Assef, Roberto AU - Stern, Daniel AU - Tsai, Chao-Wei AU - Eisenhardt, Peter AU - Bridge, Carrie AU - Benford, Dominic AU - Jarrett, Tom AU - Cutri, Roc AU - Petty, Sara AU - Wu, Jingwen AU - Wright, Edward L AB - We present WISE All-Sky mid-infrared (IR) survey detections of 55% (17/31) of the known QSOs at z > 6 from a range of surveys: the SDSS, the CFHT-LS, FIRST, Spitzer, and UKIDSS. The WISE catalog thus provides a substantial increase in the quantity of IR data available for these sources: 17 are detected in the WISE W1 (3.4 mu m) band, 16 in W2 (4.6 mu m), 3 in W3 (12 mu m), and 0 in W4 (22 mu m). This is particularly important with Spitzer in its warm-mission phase and no faint follow-up capability at wavelengths longward of 5 mu m until the launch of James Webb Space Telescope (JWST). WISE thus provides a useful tool for understanding QSOs found in forthcoming large-area optical/IR sky surveys using PanSTARRS, SkyMapper, VISTA, DES, and LSST. The rest-UV properties of the WISE-detected and the WISE-non-detected samples differ: the detections have brighter i/z-band magnitudes and redder rest-UV colors. This suggests that a more aggressive hunt for very high redshift QSOs by combining WISE W1 and W2 data with red, observed optical colors could be effective at least for a subset of dusty candidate QSOs. Stacking the WISE images of the WISE-non-detected QSOs indicates that they are, on average, significantly fainter than the WISE-detected examples, and are thus not narrowly missing detection in the WISE catalog. The WISE catalog detection of three of our sample in the W3 band indicates that their mid-IR flux can be detected individually, although there is no stacked W3 detection of sources detected in W1 but not W3. Stacking analyses of WISE data for large active galactic nucleus samples will be a useful tool, and high-redshift QSOs of all types will be easy targets for JWST. DA - 2013 DB - OpenUCT DP - University of Cape Town IS - 2 J1 - The Astrophysical Journal LK - https://open.uct.ac.za PY - 2013 SM - 0004-637X SM - 1538-4357 T1 - Wise detections of known QSOs at redshifts greater than six TI - Wise detections of known QSOs at redshifts greater than six UR - http://hdl.handle.net/11427/34976 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34976
dc.identifier.vancouvercitationBlain AW, Assef R, Stern D, Tsai C, Eisenhardt P, Bridge C, et al. Wise detections of known QSOs at redshifts greater than six. The Astrophysical Journal. 2013;778(2):113 - 177. http://hdl.handle.net/11427/34976.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceThe Astrophysical Journal
dc.source.journalissue2
dc.source.journalvolume778
dc.source.pagination113 - 177
dc.source.urihttps://dx.doi.org/10.1088/0004-637X/778/2/113
dc.subject.othergalaxies: active
dc.subject.othergalaxies: evolution
dc.subject.otherinfrared: galaxies
dc.subject.otherquasars:
dc.subject.othergeneral
dc.subject.otherdigital sky survey
dc.subject.otheractive galactic nuclei
dc.subject.otherz quasar survey
dc.subject.otherspectral
dc.subject.otherenergy-distributions
dc.subject.othermidinfrared selection
dc.subject.otherz-greater-than-5.7 quasars
dc.subject.otheradditional quasars
dc.subject.otherhost galaxies
dc.subject.otherz-similar-to-6 quasars
dc.subject.otherspitzer
dc.subject.otherobservations
dc.subject.otherArticle
dc.titleWise detections of known QSOs at redshifts greater than six
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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