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J/ApJ/710/1498         QSO luminosity function at z∼4           (Glikman+, 2010)

The faint end of the quasar luminosity function at z ∼ 4. Glikman E., Bogosavljevic M., Djorgovski S.G., Stern D., Dey A., Jannuzi B.T., Mahabal A. <Astrophys. J., 710, 1498-1514 (2010)> =2010ApJ...710.1498G
ADC_Keywords: QSOs ; Redshifts ; Magnitudes ; Surveys Keywords: cosmology: observations - large-scale structure of universe - galaxies: luminosity function, mass function - quasars: general - surveys Abstract: The evolution of the quasar luminosity function (QLF) is one of the basic cosmological measures providing insight into structure formation and mass assembly in the universe. We have conducted a spectroscopic survey to find faint quasars (-26.0<M1450←22.0) at redshifts z=3.8-5.2 in order to measure the faint end of the QLF at these early times. Using available optical imaging data from portions of the NOAO Deep Wide-Field Survey and the Deep Lens Survey, we have color-selected quasar candidates in a total area of 3.76deg2. Thirty candidates have R≤23mag. We conducted spectroscopic follow-up for 28 of our candidates and found 23 QSOs, 21 of which are reported here for the first time, in the 3.74<z<5.06 redshift range. Description: We make use of publicly available deep imaging data from the NDWFS (NOAO Deep Wide-Field Survey) in the Bootes field from the DR3 (BW,R,I bands) and from the DLS (Deep Lens Survey; DR3 in B,V,R and z' bands). DLS is closely related to the NDWFS in that the optical imaging has been obtained on the same 4m Mayall Telescope (at KPNO) and Blanco Telescope (at CTIO) using the same wide-field optical imagers Mosaic-I and Mosaic-II as the NDWFS. We obtained 28 spectra for the DLS and NDWFS candidates and found 23 high-redshift quasars (the remaining objects were three Lyman-break galaxies (LBGs) at z∼3.9, one Type-II active galactic nucleus (AGN) at z∼0.2 and one featureless, unidentified spectrum). All but two of our spectra were taken with the Low-Resolution Imaging Spectrometer (LRIS) on the Keck I telescope on Mauna Kea. Five quasars were discovered on UT 2005 November 28 and 29. Only the red camera was used, with the 400lines/mm grating blazed at 8500Å. Sixteen additional quasars were discovered during a run on UT 2006 May 20-22. Two additional spectra were taken on UT 2006 March 25 and 26 with the Multi-Aperture Red Spectrometer (MARS) on the Mayall 4m telescope at Kitt Peak. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 82 77 NOAO Deep Wide-Field Survey (NDWFS) candidates table4.dat 89 70 Deep Lens Survey (DLS) candidates table5.dat 95 23 z≳4 quasar sample
See also: J/A+A/535/A38 : Observations of NOAO Bootes field at 153MHz (Intema+, 2011) J/ApJ/699/782 : High-redshift SDSS-DR5 QSOs (Diamond-Stanic+, 2009) J/ApJ/693/8 : High-redshift QSOs in the COSMOS survey (Brusa+, 2009) J/ApJ/675/49 : High-redshift QSOs in the SWIRE survey (Siana+, 2008) J/AJ/133/2222 : Clustering of high-redshift QSOs from SDSS (Shen+, 2007) J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006) J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006) J/ApJS/161/9 : X-ray survey of the NDWFS Bootes field (Kenter+, 2005) J/AJ/121/31 : High-redshift quasars in SDSS (Fan+, 2001) http://www.archive.noao.edu/ndwfs/ : NOAO Deep Wide-Field Survey home page http://dls.physics.ucdavis.edu/ : Deep Lens Survey home page Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of Right Ascension (J2000) 4- 5 I2 min RAm Minute of Right Ascension (J2000) 7- 11 F5.2 s RAs Second of Right Ascension (J2000) 13 A1 --- DE- Sign of the Declination (J2000) 14- 15 I2 deg DEd Degree of Declination (J2000) 17- 18 I2 arcmin DEm Arcminute of Declination (J2000) 20- 23 F4.1 arcsec DEs Arcsecond of Declination (J2000) 25- 33 A9 --- Field Field identification (1) 35- 39 F5.2 mag BWmag The B_W_ band magnitude (AB mag) (G1) 41- 45 F5.2 mag e_BWmag ?=99 Uncertainty in BWmag (2) 47- 51 F5.2 mag Rmag The R band magnitude (AB mag) (G1) 53- 56 F4.2 mag e_Rmag Uncertainty in Rmag 58- 62 F5.2 mag Imag The I band magnitude (AB mag) (G1) 64- 67 F4.2 mag e_Imag Uncertainty in Imag 69- 72 F4.2 arcsec FWHM Full-Width at Half-Maximum in R band 74- 77 F4.2 --- z ? Redshift 79- 82 A4 --- Class Source classification (AGN, LBG (Lyman-break galaxie), QSO, ? or null)
Note (1): Fields (described in table 1): --------------------------------------------------------------------------- Field id Field RA+DEC (J2000) Size (') FWHMR EXPR --------------------------------------------------------------------------- 1426p3236 NDWFS J1426+3236 14:26:03.74+32:36:31.72 36.8x38.0 0.94 6000 1431p3236 NDWFS J1431+3236 14:31:36.14+32:36:46.29 36.8x38.0 0.91 6000 1434p3421 NDWFS J1434+3421 14:34:30.79+34:21:54.18 35.8x37.4 0.98 4200 1437p3347 NDWFS J1437+3347 14:37:16.32+33:47:01.72 36.9x38.0 0.87 6000 1437p3457 NDWFS J1437+3457 14:37:24.59+34:57:02.13 35.5x38.0 1.07 10800 --------------------------------------------------------------------------- Note (2): 99.0 = BWmag is an upper limit.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of Right Ascension (J2000) 4- 5 I2 min RAm Minute of Right Ascension (J2000) 7- 11 F5.2 s RAs Second of Right Ascension (J2000) 13 A1 --- DE- Sign of the Declination (J2000) 14- 15 I2 deg DEd Degree of Declination (J2000) 17- 18 I2 arcmin DEm Arcminute of Declination (J2000) 20- 23 F4.1 arcsec DEs Arcsecond of Declination (J2000) 25- 29 A5 --- Field Field identification (1) 31- 35 F5.2 mag Bmag The B band magnitude (AB mag)(G1) 37- 41 F5.2 mag e_Bmag ?=99 Uncertainty in Bmag (2) 43- 47 F5.2 mag Vmag The V band magnitude (AB mag) (G1) 49- 52 F4.2 mag e_Vmag Uncertainty in Rmag 54- 58 F5.2 mag Rmag The R band magnitude (AB mag) (G1) 60- 63 F4.2 mag e_Rmag Uncertainty in Rmag 65- 69 F5.2 mag zmag The z band magnitude (AB mag) (G1) 71- 74 F4.2 mag e_zmag Uncertainty in zmag 76- 79 F4.2 arcsec FWHM Full-Width at Half-Maximum in R band 81- 85 F5.2 --- z ? Redshift 87- 89 A3 --- Class Source classification (QSO or null)
Note (1): Fields (described in table 2): ------------------------------------------------------- Field RA (J2000) DE Size (') FWHMR EXPR ------------------------------------------------------- F2p21 09:22:37.1+30:00:00 35.1x35.1 0.86 18000 F2p31 09:22:37.1+29:20:00 35.1x35.1 0.78 18000 F2p33 09:16:27.7+29:20:00 35.1x35.1 0.86 18000 F4p23 10:49:19.4-05:00:00 35.1x35.1 0.89 18000 F4p31 10:54:40.8-05:40:00 35.1x35.1 0.87 18000 F4p32 10:52:00.0-05:40:00 35.1x35.1 0.89 18000 ------------------------------------------------------- Note (2): 99.0 = Bmag is an upper limit.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Set NDWFS (table 3) or DLS (table4) survey 7- 26 A20 --- Name NDWFS or DLS name (JHHMMSS.ss+DDMMSS.s) 27- 31 F5.2 mag Rmag The R band magnitude (AB mag) (G1) 33- 36 F4.2 --- z Redshift (spectroscopic) 38- 42 F5.3 --- Fsel The selection function (fsel) 44- 48 F5.3 --- Fspec [0/1] Spectroscopic completeness (fspec) 50- 55 F6.2 mag M1450s Absolute magnitude at rest-frame 1450AA from simulations (1) 57- 60 F4.2 --- zlims Limiting redshift from simulations (1)(2) 61 A1 --- Rem [bc] survey magnitude limit > 23 (2) 63- 68 F6.1 Mpc3/arcmin2 Vas Available volume from simulations (1)(2) (4) 69 A1 --- --- [bc] survey magnitude limit > 23 (2) 71- 76 F6.2 mag M1450 M1450 from spectrum 78- 81 F4.2 --- zlim Limiting redshift from spectrum (2) 82 A1 --- --- [bc] survey magnitude limit > 23 (2) 84- 89 F6.1 Mpc3/arcmin2 Vasp Available volume from spectrum (2)(4) 90 A1 --- --- [bc] survey magnitude limit > 23 (2) 92- 95 F4.2 deg2 Area Area
Note (1): To define color selection criteria for quasar candidates at z≳4 and determine our selection function, we simulated quasar spectra following the general procedure outlined in Fan (1999AJ....117.2528F) and Richards et al. (2006, Cat. J/AJ/131/2766) and calculated their colors for the NDWFS and DLS filter combinations. We generated a library of simulated quasar spectra, starting with a quasar template spectrum constructed from a combination of the Hubble Space Telescope (HST) radio-quiet quasar composite spectrum from Telfer et al. (2002ApJ...565..773T) which covers 300-2461Å in the quasar rest frame and the SDSS quasar composite spectrum (Vanden Berk et al. 2001AJ....122..549V) spanning rest-frame 800-9200Å. See section 3 for further details. Note (2): These values are computed to a survey magnitude limit of R=23, unless flagged with: b = values were computed to a survey magnitude limit of R=23.5. c = values were computed to a survey magnitude limit of R=24. Note (4): The available volume, Va, is the comoving volume within which a quasar with redshift z and magnitude R can be found. See section 5.3 for further details.
Global notes: Note (G1): All magnitudes have been corrected for interstellar extinction using the dust map from Schlegel et al. (1998ApJ...500..525S). For our selection, we work with these extinction and aperture-corrected magnitudes in the ABv system, converting the published Vega-based NDWFS zero points to ABv magnitudes by adding 0.0, 0.26, and 0.53mag to the BW, R, and I zero points, respectively. For the DLS, we convert from Vega magnitudes to ABv by adding -0.09, 0.0, and 0.26 to the B, V, and R zero points, respectively. See section 2 for further details.
Nomenclature Notes: In table 3, sources are <NDWFS JHHMMSS.s+DDMMSS> in Simbad. In table 4, sources are <DLS JHHMMSS.ss+DDMMSS.s> in Simbad. History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 26-Mar-2012
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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