J/ApJ/675/49 High-redshift QSOs in the SWIRE survey (Siana+, 2008)
High-redshift QSOs in the SWIRE survey and the z∼3 QSO luminosity function.
Siana B., Polletta M.D.C., Smith H.E., Lonsdale C.J., Gonzalez-Solares E.,
Farrah D., Babbedge T.S.R., Rowan-Robinson M., Surace J., Shupe D.,
Fang F., Franceschini A., Oliver S.
<Astrophys. J., 675, 49-70 (2008)>
=2008ApJ...675...49S 2008ApJ...675...49S
ADC_Keywords: QSOs ; Redshifts ; Photometry, SDSS ;
Photometry, millimetric/submm
Keywords: intergalactic medium - quasars: general
Abstract:
We use a simple optical/infrared (IR) photometric selection of
high-redshift QSOs that identifies a Lyman break in the optical
photometry and requires a red IR color to distinguish QSOs from common
interlopers. The search yields 100 z∼3 (U-dropout) QSO candidates with
19<r'<22 over 11.7deg2 in the ELAIS-N1 (EN1) and ELAIS-N2 (EN2)
fields of the Spitzer Wide-area Infrared Extragalactic (SWIRE) Legacy
Survey. The z∼3 selection is reliable, with spectroscopic follow-up of
10 candidates confirming that they are all QSOs at 2.83<z<3.44. We
find that our z∼4 (g'-dropout) sample suffers from both unreliability
and incompleteness but present seven previously unidentified QSOs at
3.50<z<3.89.
Description:
The EN1 and EN2 fields were imaged as part of the Wide Field Survey
(WFS). 11 Images were taken with the Wide Field
Camera (WFC) on the 2.5m Isaac Newton Telescope (INT).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 13 7762 The broadband optical/IR template combined with
the Telfer et al. (2002ApJ...565..773T 2002ApJ...565..773T)/
Vandenberk et al. (2001AJ....122..549V 2001AJ....122..549V)
composite spectra
table5.dat 114 102 Optical/IR photometry of the 100 z∼3 QSO candidates
table6.dat 114 12 Redshifts and optical/IR photometry of the seven
spectroscopically confirmed z∼4 (g'-dropout)
QSOs and two SDSS QSOs in our sample
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See also:
II/255 : SWIRE ELAIS N1 Source Catalogs (Surace+, 2004)
II/290 : SWIRE Photometric Redshift Catalogue (Rowan-Robinson+, 2008)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 F7.4 um lambda Wavelength in microns
9- 13 F5.3 --- Flux Normalized flux at lambda
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Byte-by-byte Description of file: table[56].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number (1)
4- 6 A3 --- n_Seq Note on the object (2)
8- 12 A5 --- --- [SWIRE]
14- 32 A19 --- SWIRE SWIRE name (JHHMMSS.ss+DDMMSS.s)
34- 42 F9.5 deg RAdeg Rigth ascension (J2000)
44- 51 F8.5 deg DEdeg Declination (J2000)
53- 57 F5.3 --- zsp ?=- Spectroscopic redshift
58 A1 --- n_zsp [s?] 's' = redshift from SDSS
60- 64 F5.2 mag Umag ?=99.00 U magnitude (Vega)
65 A1 --- u_Umag [)] ')' when U magnitude is 5σ limit
67- 71 F5.2 mag g'mag g' magnitude (Vega) (4)
73- 77 F5.2 mag r'mag r' magnitude (Vega) (4)
79- 83 F5.2 mag i'mag ?=99.00 i' magnitude (Vega) (4)
85- 89 F5.2 mag Zmag ?=99.00 Z magnitude (Vega) (4)
91- 93 I3 uJy F3.6 IRAC1 (3.6um) flux (5)
95- 97 I3 uJy F4.5 IRAC2 (4.5um) flux (5)
99 A1 --- l_F5.8 Limit flag on F5.8
100-102 I3 uJy F5.8 IRAC3 (5.8um) flux (5)
104 A1 --- l_F8.0 Limit flag on F8.0
105-108 I4 uJy F8.0 IRAC4 (8.0um) magnitude (5)
110 A1 --- l_F24 Limit flag on F24
111-114 I4 uJy F24 MIPS24 (24um) flux
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Note (1): In table6, initial sequential numbers (1-12) supplemented by 200.
Objects named <[SPS2008] NNN> in Simbad.
Note (2): Note as follows:
a = Revised photometry moved object outside of color criteria.
Two objects with spectroscopic confirmation were moved just
outside of our color criteria (due to revised photometry) and are
no longer part of our primary sample.
b = Selected in the SWIRE Lockman field
c = Low-redshift interlopers
d = Could not see emission lines for redshift confirmation
Note (4): Typical uncertainties are ∼0.04mag.
Note (5): Typical uncertainties are ∼10%.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 03-Jul-2010