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J/ApJ/829/33      Luminous of high-z QSOs with SDSS and WISE. II   (Yang+, 2016)

A Survey of Luminous High-redshift Quasars with SDSS and WISE. II. The Bright End of the Quasar Luminosity Function at z ~= 5. Yang J., Wang F., Wu X.-B., Fan X., McGreer I.D., Bian F., Yi W., Yang Q., Ai Y., Dong X., Zuo W., Green R., Jiang L., Wang S., Wang R., Yue M. <Astrophys. J., 829, 33 (2016)> =2016ApJ...829...33Y
ADC_Keywords: QSOs ; Redshifts ; Photometry, SDSS ; Photometry, infrared ; Spectroscopy Keywords: galaxies: active - galaxies: high-redshift - quasars: general Abstract: This is the second paper in a series on a new luminous z∼5 quasar survey using optical and near-infrared colors. Here we present a new determination of the bright end of the quasar luminosity function (QLF) at z∼5. Combining our 45 new quasars with previously known quasars that satisfy our selections, we construct the largest uniform luminous z∼5 quasar sample to date, with 99 quasars in the range of 4.7≤z<5.4 and -29<M1450≤-26.8, within the Sloan Digital Sky Survey (SDSS) footprint. We use a modified 1/Va method including flux limit correction to derive a binned QLF, and we model the parametric QLF using maximum likelihood estimation. With the faint-end slope of the QLF fixed as α=-2.03 from previous deeper samples, the best fit of our QLF gives a flatter bright end slope β=-3.58±0.24 and a fainter break magnitude M1450*=-26.98±0.23 than previous studies at similar redshift. Combined with previous work at lower and higher redshifts, our result is consistent with a luminosity evolution and density evolution model. Using the best-fit QLF, the contribution of quasars to the ionizing background at z∼5 is found to be 18%-45% with a clumping factor C of 2-5. Our sample suggests an evolution of radio loud fraction with optical luminosity but no obvious evolution with redshift. Description: Our SDSS+WISE selection technique and spectroscopic follow-up observations were discussed in detail in Wang et al. (2016, Cat. J/ApJ/819/24). Our spectroscopic follow-up campaign started in 2013 October with the Lijiang 2.4m telescope (LJT) and Xinglong 2.16m telescope in China, the Kitt Peak 2.3m Bok telescope and 6.5m MMT telescope in the U.S., as well as the 2.3m ANU telescope in Australia. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . this file table1.dat 102 99 z∼5 quasar sample used for QLF measurement
See also: II/311 : WISE All-Sky Data Release (Cutri+ 2012) II/328 : AllWISE Data Release (Cutri+ 2013) II/294 : The SDSS Photometric Catalog, DR7 (Adelman-McCarthy+, 2009) V/147 : The SDSS Photometric Catalog, DR12 (Alam+, 2015) VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004) VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017) VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) J/A+A/585/A87 : Quasar composite made from bright QSOs (Selsing+, 2016) J/ApJ/819/24 : z>4.5 QSOs with SDSS and WISE. I. Opt. spectra (Wang+, 2016) J/ApJ/794/75 : HST-COS UV spectra observations of AGNs (Stevans+, 2014) J/ApJ/768/105 : z∼5 QSO luminosity function from SDSS Stripe 82 (McGreer+, 2013) J/ApJ/773/14 : BOSS: quasar luminosity function (Ross+, 2013) J/ApJ/755/169 : 3<z<5 quasar luminosity function in COSMOS (Masters+, 2012) J/ApJ/728/23 : GALEX UV-bright high-redshift quasars (Worseck+, 2011) J/ApJ/710/1498 : QSO luminosity function at z∼4 (Glikman+, 2010) J/AJ/131/2788 : Redshifts in the SFQS survey (Jiang+, 2006) J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006) J/MNRAS/341/993 : ujbr photometry and redshifts of QSOs (Cirasuolo+, 2003) J/ApJ/445/62 : Radio properties of optically selected quasars (Hooper+ 1995) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 20 A20 --- Name Source identifier ( 21 A1 --- f_Name Flag on Name (1) 23- 27 F5.2 mag rmag [19.48/22.35] SDSS r magnitude (2) 29- 32 F4.2 mag e_rmag [0.02/0.15] Error in rmag (2) 34- 38 F5.2 mag imag [17.96/20.15] SDSS i magnitude (2) 40- 43 F4.2 mag e_imag [0.01/0.07] Error in imag (2) 45- 49 F5.2 mag zmag [17.47/19.49] SDSS z magnitude (2) 51- 54 F4.2 mag e_zmag [0.02/0.1] Error in zmag (2) 56- 60 F5.2 mag W1mag [14.31/16.89] W1 magnitude (3) 62- 65 F4.2 mag e_W1mag [0.03/0.28] Error in W1mag (3) 67- 71 F5.2 mag W2mag [13.46/16.11] W1 magnitude (3) 73- 76 F4.2 mag e_W2mag [0.03/0.18] Error in W2mag (3) 78- 81 F4.2 --- Redshift [4.7/5.37] Redshift 83- 88 F6.2 mag M1450 [-28.99/-26.8] Absolute 1450Å AB magnitude 90-102 A13 --- Notes Quasar origin (4)
Note (1): Flag on Name, defined as follows: b = This quasar discovered by McGreer et al. (2009AJ....138.1925M) using the radio-selection method was also observed by us and we use the new spectra for the M1450 calculation. c = This quasar discovered by Schneider et al. (1991AJ....102..837S) was also observed by us and we use the new spectra for the M1450 calculation. Note (2): Photometric data from the SDSS are in the SDSS photometric system (Lupton et al. 1999AJ....118.1406L), which is almost identical to the AB system at bright magnitudes. Note (3): Photometric data from ALLWISE are in the Vega system. Note (4): The quasar origin is defined as follows: DR7 = Quasars from the SDSS DR7 DR12 = Quasars from the SDSS DR12 Paper I = Quasars identified by Wang et al. 2016ApJ...819...24W, Cat. J/ApJ/819/24 Schneider1991 = Schneider et al. 1991AJ....102..837S McGreer2009 = McGreer et al. 2009AJ....138.1925M
History: From electronic version of the journal References: Wang et al. Paper I 2016ApJ...819...24W, Cat. J/ApJ/819/24
(End) 08-Mar-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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