{"oa":1,"quality_controlled":"1","month":"01","scopus_import":"1","publication":"The Astronomical Journal","year":"2006","publication_identifier":{"issn":["0004-6256","1538-3881"]},"doi":"10.1086/498063","publication_status":"published","abstract":[{"lang":"eng","text":"We report on i-band snapshot observations of 157 Sloan Digital Sky Survey (SDSS) quasars at 4<z<5.4 using the Advanced Camera for Surveys on the Hubble Space Telescope (HST) to search for evidence of gravitational lensing of these sources. None of the quasars appear to be strongly lensed and multiply imaged at the angular resolution (~0.1\") and sensitivity of HST. The non-detection of strong lensing in these systems constrains the z=4-5 luminosity function to an intrinsic slope of beta>-3.8 (3 sigma), assuming a break in the quasar luminosity function at M*_145=-24.5. This constraint is considerably stronger than the limit of beta>-4.63 obtained from the absence of lensing in four z>5.7 quasars. Such constraints are important for our understanding of the true space density of high-redshift quasars and the ionization state of the early universe."}],"intvolume":"       131","article_processing_charge":"No","volume":131,"_id":"17727","extern":"1","title":"A snapshot survey for gravitational lenses among z ≥ 4.0 quasars. II. Constraints on the 4.0 < z < 5.4 quasar population","page":"49-54","author":[{"first_name":"Gordon T.","full_name":"Richards, Gordon T.","last_name":"Richards"},{"full_name":"Haiman, Zoltán","first_name":"Zoltán","id":"7c006e8c-cc0d-11ee-8322-cb904ef76f36","last_name":"Haiman"},{"last_name":"Pindor","first_name":"Bartosz","full_name":"Pindor, Bartosz"},{"first_name":"Michael A.","full_name":"Strauss, Michael A.","last_name":"Strauss"},{"first_name":"Xiaohui","full_name":"Fan, Xiaohui","last_name":"Fan"},{"first_name":"Daniel","full_name":"Eisenstein, Daniel","last_name":"Eisenstein"},{"full_name":"Schneider, Donald P.","first_name":"Donald P.","last_name":"Schneider"},{"last_name":"Bahcall","full_name":"Bahcall, Neta A.","first_name":"Neta A."},{"last_name":"Brinkmann","first_name":"J.","full_name":"Brinkmann, J."},{"last_name":"Fukugita","full_name":"Fukugita, Masataka","first_name":"Masataka"}],"date_created":"2024-09-06T09:13:53Z","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","status":"public","day":"01","main_file_link":[{"url":"https://doi.org/10.1086/498063","open_access":"1"}],"article_type":"original","date_published":"2006-01-01T00:00:00Z","issue":"1","language":[{"iso":"eng"}],"publisher":"American Astronomical Society","type":"journal_article","citation":{"mla":"Richards, Gordon T., et al. “A Snapshot Survey for Gravitational Lenses among z ≥ 4.0 Quasars. II. Constraints on the 4.0 &#60; z &#60; 5.4 Quasar Population.” <i>The Astronomical Journal</i>, vol. 131, no. 1, American Astronomical Society, 2006, pp. 49–54, doi:<a href=\"https://doi.org/10.1086/498063\">10.1086/498063</a>.","ieee":"G. T. Richards <i>et al.</i>, “A snapshot survey for gravitational lenses among z ≥ 4.0 quasars. II. Constraints on the 4.0 &#60; z &#60; 5.4 quasar population,” <i>The Astronomical Journal</i>, vol. 131, no. 1. American Astronomical Society, pp. 49–54, 2006.","ista":"Richards GT, Haiman Z, Pindor B, Strauss MA, Fan X, Eisenstein D, Schneider DP, Bahcall NA, Brinkmann J, Fukugita M. 2006. A snapshot survey for gravitational lenses among z ≥ 4.0 quasars. II. Constraints on the 4.0 &#60; z &#60; 5.4 quasar population. The Astronomical Journal. 131(1), 49–54.","apa":"Richards, G. T., Haiman, Z., Pindor, B., Strauss, M. A., Fan, X., Eisenstein, D., … Fukugita, M. (2006). A snapshot survey for gravitational lenses among z ≥ 4.0 quasars. II. Constraints on the 4.0 &#60; z &#60; 5.4 quasar population. <i>The Astronomical Journal</i>. American Astronomical Society. <a href=\"https://doi.org/10.1086/498063\">https://doi.org/10.1086/498063</a>","chicago":"Richards, Gordon T., Zoltán Haiman, Bartosz Pindor, Michael A. Strauss, Xiaohui Fan, Daniel Eisenstein, Donald P. Schneider, Neta A. Bahcall, J. Brinkmann, and Masataka Fukugita. “A Snapshot Survey for Gravitational Lenses among z ≥ 4.0 Quasars. II. Constraints on the 4.0 &#60; z &#60; 5.4 Quasar Population.” <i>The Astronomical Journal</i>. American Astronomical Society, 2006. <a href=\"https://doi.org/10.1086/498063\">https://doi.org/10.1086/498063</a>.","short":"G.T. Richards, Z. Haiman, B. Pindor, M.A. Strauss, X. Fan, D. Eisenstein, D.P. Schneider, N.A. Bahcall, J. Brinkmann, M. Fukugita, The Astronomical Journal 131 (2006) 49–54.","ama":"Richards GT, Haiman Z, Pindor B, et al. A snapshot survey for gravitational lenses among z ≥ 4.0 quasars. II. Constraints on the 4.0 &#60; z &#60; 5.4 quasar population. <i>The Astronomical Journal</i>. 2006;131(1):49-54. doi:<a href=\"https://doi.org/10.1086/498063\">10.1086/498063</a>"},"date_updated":"2024-09-26T07:23:51Z","oa_version":"Published Version"}