J/AJ/129/1198 SDSS quasars in SWIRE ELAIS N1 field (Hatziminaoglou+, 2005)
Sloan Digital Sky Survey quasars in the Spitzer wide-area infrared extragalactic
survey (SWIRE) ELAIS N1 field: properties and spectral energy distributions.
Hatziminaoglou E., Perez-Fournon I., Polletta M., Afonso-Luis A.,
Hernan-Caballero A., Montenegro-Montes F.M., Lonsdale C., Xu C.K.,
Franceschini A., Rowan-Robinson M., Babbedge T., Smith H.E., Surace J.,
Shupe D., Fang F., Farrah D., Oliver S., Gonzalez-Solares E.A., Serjeant S.
<Astron. J., 129, 1198-1211 (2005)>
=2005AJ....129.1198H 2005AJ....129.1198H
ADC_Keywords: QSOs ; Photometry, infrared ; Redshifts
Keywords: galaxies: active - infrared: general - quasars: general
Abstract:
We present a mid-infrared (MIR) analysis of 35 quasars with
spectroscopic redshifts selected from the Spitzer Wide-Area Infrared
Extragalactic Survey (SWIRE). We discuss their optical and MIR colors
and show that these quasars occupy well-defined regions in MIR
color-color space. We examine the issue of type 1 active galactic
nuclei candidate selection in detail and propose new selection methods
based on MIR colors. The available multiband data allow us to
construct two new, well-sampled quasar templates, covering wavelengths
from the ultraviolet to the MIR.
Description:
The MIR data used here are taken from the SWIRE ELAIS N1 field and
were obtained in 2004 February with both IRAC and MIPS. For the
purposes of this work only the four IRAC bands (referred to as IRAC1,
IRAC2, etc., throughout) and MIPS 24µm (hereafter MIPS24) are used.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 109 35 Positions, redshifts, optical magnitudes, and
aperture fluxes for the 35 spectroscopically
confirmed quasars
table2.dat 15 1055 Quasar SED template created using the
35 SWIRE-SDSS quasars
table3.dat 15 575 Quasar SED template created using the SWIRE-SDSS
quasar subsample with the largest IR fluxes
table4.dat 85 12 2MASS Vega magnitudes, ISO fluxes (from Vaccari
et al. 2005MNRAS.358..397V 2005MNRAS.358..397V), radio fluxes, and
related errors (whenever available) for the
quasars with near-IR and/or 15µm and/or
radio counterparts
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See also:
II/255 : SWIRE ELAIS N1 Source Catalogs (Surace+, 2004)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [HPP2005] Sequential number
4- 8 A5 --- f_[HPP2005] Flag on [HPP2005] (1)
10- 11 I2 h RAh Hour of Right Ascension (J2000)
13- 14 I2 min RAm Minute of Right Ascension (J2000)
16- 20 F5.2 s RAs Second of Right Ascension (J2000)
21 A1 --- DE- Sign of the Declination (J2000)
22- 23 I2 deg DEd Degree of Declination (J2000)
25- 26 I2 arcmin DEm Arcminute of Declination (J2000)
28- 31 F4.1 arcsec DEs Arcseconde of Declination (J2000)
34- 38 F5.3 --- z Redshift
40- 44 F5.2 mag umag SDSS u band magnitude
46- 50 F5.2 mag gmag SDSS g band magnitude
52- 56 F5.2 mag rmag SDSS r band magnitude
58- 62 F5.2 mag imag SDSS i band magnitude
64- 68 F5.2 mag zmag SDSS z band magnitude
70- 73 F4.2 mag IRAC1mag ? IRAC1 band (3.6µm) magnitude (2)
75- 78 F4.2 mag IRAC2mag ? IRAC2 band (4.5µm) magnitude (2)
80- 83 F4.2 mag IRAC3mag ? IRAC3 band (5.8µm) magnitude
85- 88 F4.2 mag e_IRAC3mag ? Error in IRAC3mag
90- 93 F4.2 mag IRAC4mag ? IRAC4 band (8µm) magnitude
95- 98 F4.2 mag e_IRAC4mag ? Error in IRAC4mag
100-104 F5.2 mag MIPS24mag ? MIPS 24µm magnitude
106-109 F4.2 mag e_MIPS24mag ? Error in MIPS24mag
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Note (1): Flag on Seq, defined as follows:
a = Object at the border of the field not (or partially) covered by IRAC.
b = Object with 2MASS JHK counterparts.
c = Object with radio detection.
d = Object with ELAIS 15{um}m detection.
e = Object with RASS detections.
f = The 2MASS magnitudes, ISO 15µm, and radio fluxes can be found
in Table 4.
g = Object in the MIPS 24µm gap.
h = Object with IRAS detections.
Note (2): The errors in the IRAC1 and IRAC2 fluxes are lower than 0.01mJy
(typically on the order of a few microjanskys) and are not reported here.
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Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 um Lambda [0.0792/173.897] Wavelength in microns (1)
10- 15 F6.3 --- Flux Normalized flux: Fλ/F0.3µm
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Note (1): Spanning the wavelength range between ∼800 and 2x106Å.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [HPP2005] Sequential number
4- 5 I2 h RAh Hour of Right Ascension (J2000)
7- 8 I2 min RAm Minute of Right Ascension (J2000)
10- 14 F5.2 s RAs Second of Right Ascension (J2000)
15 A1 --- DE- Sign of the Declination (J2000)
16- 17 I2 deg DEd Degree of Declination (J2000)
19- 20 I2 arcmin DEm Arcminute of Declination (J2000)
22- 25 F4.1 arcsec DEs Arcsecond of Declination (J2000)
27- 31 F5.2 mag Jmag ? 2MASS J band magnitude
33- 36 F4.2 mag e_Jmag ? Error in Jmag
38- 42 F5.2 mag Hmag ? 2MASS H band magnitude
44- 47 F4.2 mag e_Hmag ? Error in Hmag
49- 53 F5.2 mag Kmag ? 2MASS K band magnitude
55- 58 F4.2 mag e_Kmag ? Error in Kmag
60- 63 F4.2 mJy S15um ? ISO 15µm flux
65- 68 F4.2 mJy e_S15um ? Error in S15um
70- 72 I3 mJy S4.85GHz ? Flux at 4.85GHz
74- 79 F6.2 mJy S1.4GHz ? Flux at 1.4GHz
81- 85 F5.3 mJy e_S1.4GHz ? Error in S1.4GHz
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 15-Sep-2005