J/ApJS/225/1 SpIES: the Spitzer IRAC Equatorial Survey (Timlin+, 2016)
SpIES: the Spitzer IRAC Equatorial Survey.
Timlin J.D., Ross N.P., Richards G.T., Lacy M., Ryan E.L., Stone R.B.,
Bauer F.E., Brandt W.N., Fan X., Glikman E., Haggard D., Jiang L.,
Lamassa S.M., Lin Y.-T., Makler M., McGehee P., Myers A.D., Schneider D.P.,
Megan Urry C., Wollack E.J., Zakamska N.L.
<Astrophys. J. Suppl. Ser., 225, 1-1 (2016)>
=2016ApJS..225....1T 2016ApJS..225....1T (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, infrared ; Surveys ; QSOs
Keywords: catalogs; infrared: general; quasars: general; surveys
Abstract:
We describe the first data release from the Spitzer-IRAC Equatorial
Survey (SpIES); a large-area survey of ∼115deg2 in the Equatorial
SDSS Stripe 82 field using Spitzer during its "warm" mission phase.
SpIES was designed to probe sufficient volume to perform measurements
of quasar clustering and the luminosity function at z≥3 to test
various models for "feedback" from active galactic nuclei (AGNs).
Additionally, the wide range of available multi-wavelength,
multi-epoch ancillary data enables SpIES to identify both
high-redshift (z≥5) quasars as well as obscured quasars missed by
optical surveys. SpIES achieves 5σ depths of 6.13uJy (21.93 AB
magnitude) and 5.75uJy (22.0 AB magnitude) at 3.6 and 4.5um,
respectively --depths significantly fainter than the Wide-field
Infrared Survey Explorer (WISE). We show that the SpIES survey
recovers a much larger fraction of spectroscopically confirmed quasars
(∼98%) in Stripe 82 than are recovered by WISE (∼55%). This depth is
especially powerful at high-redshift (z≥3.5), where SpIES recovers
94% of confirmed quasars, whereas WISE only recovers 25%. Here we
define the SpIES survey parameters and describe the image processing,
source extraction, and catalog production methods used to analyze the
SpIES data. In addition to this survey paper, we release 234 images
created by the SpIES team and three detection catalogs: a 3.6um only
detection catalog containing ∼6.1 million sources, a 4.5um only
detection catalog containing ∼6.5 million sources, and a dual-band
detection catalog containing ∼5.4 million sources.
Description:
The observational goal of the SpIES project was to map SDSS Stripe 82
(S82) field located on the Celestial Equator spanning a range of
-60°≤α≤60° and -1.25°≤δ≤1.25°. The
SpIES observations cover approximately one-third of this region
centered on δ=0° and spanning the range from
-30°≤α≤35°. See section 2 for further explanations.
Spitzer-IRAC Equatorial Survey (SpIES) data were obtained as part of
Cycle 9 (2012-2014) of the Spitzer "warm" post-cryogenic mission
utilizing the first two channels (3.6 and 4.5um) of IRAC.
In total, SpIES is comprised of 154 individual Astronomical
Observation Requests (AORs) observed over two epochs separated by no
less than five hours in time (77 AORs per epoch), which corresponds to
∼70000 IRAC FOVs spanning the full survey area. See section 3 for
further explanations.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table10.dat 83 154 Full SpIES Astronomical Observation Request
(AOR) list
spiesall.dat 376 5463475 *SpIES combined dual-band detection catalog
spiesch1.dat 191 6133631 *SpIES channel 1 (3.6um) only detection catalog
spiesch2.dat 184 6636175 *SpIES channel 2 (4.5um) only detection catalog
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Note on spies*.dat: To be regarded as a real source, the SExtractor flags must
be less than or equal to 4, the objects must have flag 0 or 2 in the
FLAG_2MASS column, and there has to be greater than or equal to two coverages
for each source and the high reliability column must be equal or superior
to 1.
For an object to have good photometry, we further require that the SExtractor
flags be less than or equal to 0 or equal to 2 (i.e., -999.0, 0, and 2),
FLAG_2MASS must be 0, and it must satisfy the same coverage conditions as
before and the high reliability column must be equal to 2.
See section 5.3 for further explanations.
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See also:
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
V/141 : Light-Motion Curve Catalogue (LMCC) in Stripe 82 (Bramich+ 2008)
J/ApJ/824/70 : UV-FIR SED results of SDSS QSOs & their hosts (Dong+, 2016)
J/ApJ/817/172 : X-ray Observations of Stripe 82 (LaMassa+, 2016)
J/ApJS/221/23 : IRAC HUDF and GOODS ultradeep surveys (Labbe+, 2015)
J/ApJS/219/39 : QSOs selection from SDSS and WISE (Richards+, 2015)
J/ApJ/804/27 : NIR photometry of hot dust-obscured galaxies (Assef+, 2015)
J/ApJ/799/72 : Binary AGNs from the VLA Stripe 82 survey (Fu+, 2015)
J/ApJS/213/12 : SDSS Stripe 82 co-added runs (Jiang+, 2014)
J/ApJS/210/22 : Herschel Stripe 82 survey (HerS) 1st catalog (Viero+, 2014)
J/MNRAS/441/1802 : Low-redshift QSOs in SDSS Stripe 82 (Karhunen+, 2014)
J/MNRAS/440/476 : Low-redshift quasars in SDSS Stripe 82 (Falomo+, 2014)
J/MNRAS/439/1212 : Deep 20GHz survey of CDFS & SDSS Stripe 82 (Franzen+, 2014)
J/MNRAS/436/3581 : X-ray observations of Stripe 82 (LaMassa+, 2013)
J/ApJS/209/22 : SSDF survey: IRAC catalogs (Ashby+, 2013)
J/ApJ/778/127 : UKIDSS+FIRST+SDSS red QSOs candidates (Glikman+, 2013)
J/MNRAS/435/3306 : Candidate type II QSOs in SDSS III (Alexandroff+, 2013)
J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013)
J/ApJ/769/125 : 1.4GHz radio variability in FIRST+SDSS S82 (Hodge+, 2013)
J/ApJ/768/105 : z∼5 QSO luminosity function from SDSS S82 (McGreer+, 2013)
J/AJ/142/3 : 1.4GHz observations of Stripe 82 (Hodge+, 2011)
J/A+A/525/A37 : Variability indexes of QSOs in SDSS S82 (Meusinger+, 2011)
J/ApJ/701/428 : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009)
J/MNRAS/392/19 : The 2dF-SDSS QSO survey (Croom+, 2009)
http://www.sdss3.org/ : SDSS-III home page
http://sha.ipac.caltech.edu/applications/Spitzer/SHA/ : Spitzer archive
Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Running sequence number
5- 11 A7 --- SpIES SpIES AOR Label, IRACPC-SPIES-###
12- 19 I8 --- AOR Spitzer Astronomical Observation
Request (AOR) key
21- 27 F7.3 deg RAdeg Right Ascension in decimal degrees (J2000)
29- 37 F9.6 deg DEdeg [-0.0084/0.0084] Declination (J2000)
39- 48 A10 "Y-M-D" Obs0.date Starting UT date of the observation
50- 57 A8 "h:m:s" Obs0.time Starting UT time of the observation
59- 68 A10 "Y-M-D" Obs1.date Ending UT date of the observation
70- 77 A8 "h:m:s" Obs1.time Ending UT time of the observation
79- 83 I5 s Exp [11945/23819] Integration time
--------------------------------------------------------------------------------
Byte-by-byte Description of file: spiesall.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.7 deg RAdeg [0/360.1] Right ascension at 3.6um (J2000)
(RA_ch1)
13- 22 F10.7 deg DEdeg [-1.2/1.2] Declination at 3.6um (J2000)
(DEC_ch1)
24- 32 E9.3 uJy/pix Fap1Ch1 3.6um flux density, l.44" radius
(FLUXAPER1_ch1) (G1)
34- 42 E9.3 uJy/pix Fap2Ch1 3.6um flux density, 1.92" radius
(FLUXAPER2_ch1) (G1)
44- 52 E9.3 uJy/pix Fap3Ch1 3.6um flux density, 2.89" radius
(FLUXAPER3_ch1) (G1)
54- 62 E9.3 uJy/pix Fap4Ch1 3.6um flux density, 4.08" radius
(FLUXAPER4_ch1) (G1)
64- 72 E9.3 uJy/pix Fap5Ch1 3.6um flux density, 5.76" radius
(FLUXAPER5_ch1) (G1)
74- 82 E9.3 uJy/pix Fap6Ch1 3.6um flux density, 12" radius
(FLUXAPER6_ch1)
84- 90 F7.1 uJy/pix e_Fap1Ch1 Fap1Ch1 uncertainty (FLUXERRAPER1_ch1) (G1)
92- 98 F7.1 uJy/pix e_Fap2Ch1 Fap2Ch1 uncertainty (FLUXERRAPER2_ch1) (G1)
100-107 F8.1 uJy/pix e_Fap3Ch1 Fap3Ch1 uncertainty (FLUXERRAPER3_ch1) (G1)
109-116 F8.1 uJy/pix e_Fap4Ch1 Fap4Ch1 uncertainty (FLUXERRAPER4_ch1) (G1)
118-125 F8.1 uJy/pix e_Fap5Ch1 Fap5Ch1 uncertainty (FLUXERRAPER5_ch1) (G1)
127-134 F8.1 uJy/pix e_Fap6Ch1 [1/252088] Fap6Ch1 uncertainty
(FLUXERRAPER6_ch1) (G1)
136-144 E9.3 uJy/pix FCh1 Total 3.6um flux density (FLUXAUTOch1) (G1)
146-153 F8.1 uJy/pix e_FCh1 [0.5/88510] FCh1 uncertainty
(FLUXERRAUTOch1) (G1)
155-158 I4 --- Ch1 [0/19] 3.6um SExtractor Flags (FLAGS_ch1) (G2)
160-163 I4 --- Ch1b ?=-999 3.6um SExtractor Flags (second value)
(FLAGS_ch1 - second value) (G3)
165-171 E7.2 --- ClCh1 [0/1] 3.6um morphology classification
(1=resolved; 0=extended) (CLASSSTARch1)
173 I1 --- 2MCh1 [0/2]? 3.6um object near a 2MASS bright star?
(1=near a 2MASS bright star) (FLAG2MASSch1)
175-181 F7.2 --- COVCh1 [0/10.2] Number of cBCD coverages
(COV_ch1) (G4)
183-189 F7.2 --- COVCh1b ? Number of cBCD coverages (second value)
(COV_ch1 - second value) (G4)
191 I1 --- HRCh1 [0/2]? Most reliable objects
(2=good photometry) (HIGHRELch1)
193-203 F11.7 deg RA2deg Right ascension at 4.5um (J2000) (RA_ch2)
205-214 F10.7 deg DE2deg [-1.2/1.2] Declination at 4.5um (J2000)
(DEC_ch2)
216-224 E9.3 uJy/pix Fap1Ch2 4.5um flux density, l.44" radius
(FLUXAPER1_ch2) (G1)
226-234 E9.3 uJy/pix Fap2Ch2 4.5um flux density, l.92" radius
(FLUXAPER2_ch2) (G1)
236-244 E9.3 uJy/pix Fap3Ch2 4.5um flux density, 2.89" radius
(FLUXAPER3_ch2) (G1)
246-254 E9.3 uJy/pix Fap4Ch2 4.5um flux density, 4.08" radius
(FLUXAPER4_ch2) (G1)
256-264 E9.3 uJy/pix Fap5Ch2 4.5um flux density, 5.76" radius
(FLUXAPER5_ch2) (G1)
266-274 E9.3 uJy/pix Fap6Ch2 4.5um flux density, 12" radius
(FLUXAPER6_ch2) (G1)
276-281 F6.1 uJy/pix e_Fap1Ch2 Fap1Ch2 uncertainty (FLUXERRAPER1_ch2) (G1)
283-288 F6.1 uJy/pix e_Fap2Ch2 Fap2Ch2 uncertainty (FLUXERRAPER2_ch2) (G1)
290-295 F6.1 uJy/pix e_Fap3Ch2 Fap3Ch2 uncertainty (FLUXERRAPER3_ch2) (G1)
297-303 F7.1 uJy/pix e_Fap4Ch2 Fap4Ch2 uncertainty (FLUXERRAPER4_ch2) (G1)
305-311 F7.1 uJy/pix e_Fap5Ch2 Fap5Ch2 uncertainty (FLUXERRAPER5_ch2) (G1)
313-320 F8.1 uJy/pix e_Fap6Ch2 [1/63037] Fap6Ch2 uncertainty
(FLUXERRAPER6_ch2) (G1)
322-330 E9.3 uJy/pix FCh2 Total 4.5um flux density (FLUXAUTOch2) (G1)
332-338 F7.1 uJy/pix e_FCh2 [0.5/10139] FCh2 uncertainty
(FLUXERRAUTOch2) (G1)
340-343 I4 --- Ch2 [0/19] 4.5um SExtractor Flags (FLAGS_ch2) (G2)
345-348 I4 --- Ch2b ?=-999 4.5um SExtractor Flags (second value)
(FLAGS_ch2 - second value) (G3)
350-356 E7.2 --- ClCh2 [0/1] 4.5um morphology classification
(1=resolved; 0=extended) (CLASSSTARch2)
358 I1 --- 2MCh2 [0/2]? 4.5um object near a 2MASS bright star?
(1=near a 2MASS bright star) (FLAG2MASSch2)
360-366 F7.2 --- COVCh2 [0/10.2] Number of cBCD coverages
(COV_ch2) (G4)
368-374 F7.2 --- COVCh2b ? Number of cBCD coverages (second value)
(COV_ch2 - second value) (G4)
376 I1 --- HRCh2 [0/2] Most reliable objects
(2=good photometry) (HIGHRELch2)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: spiesch1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.7 deg RAdeg [0/360.1] Right ascension at 3.6um (J2000)
(RA_ch1)
13- 22 F10.7 deg DEdeg [-1.2/1.3] Declination at 3.6um (J2000)
(DEC_ch1)
24- 32 E9.3 uJy/pix Fap1Ch1 3.6um flux density, l.44" radius
(FLUXAPER1_ch1) (G1)
34- 42 E9.3 uJy/pix Fap2Ch1 3.6um flux density, 1.92" radius
(FLUXAPER2_ch1) (G1)
44- 52 E9.3 uJy/pix Fap3Ch1 3.6um flux density, 2.89" radius
(FLUXAPER3_ch1) (G1)
54- 62 E9.3 uJy/pix Fap4Ch1 3.6um flux density, 4.08" radius
(FLUXAPER4_ch1) (G1)
64- 72 E9.3 uJy/pix Fap5Ch1 3.6um flux density, 5.76" radius
(FLUXAPER5_ch1) (G1)
74- 82 E9.3 uJy/pix Fap6Ch1 3.6um flux density, 12" radius
(FLUXAPER6_ch1)
84- 90 F7.1 uJy/pix e_Fap1Ch1 Fap1Ch1 uncertainty (FLUXERRAPER1_ch1) (G1)
92- 98 F7.1 uJy/pix e_Fap2Ch1 Fap2Ch1 uncertainty (FLUXERRAPER2_ch1) (G1)
100-107 F8.1 uJy/pix e_Fap3Ch1 Fap3Ch1 uncertainty (FLUXERRAPER3_ch1) (G1)
109-116 F8.1 uJy/pix e_Fap4Ch1 Fap4Ch1 uncertainty (FLUXERRAPER4_ch1) (G1)
118-125 F8.1 uJy/pix e_Fap5Ch1 Fap5Ch1 uncertainty (FLUXERRAPER5_ch1) (G1)
127-134 F8.1 uJy/pix e_Fap6Ch1 [2/241103] Fap6Ch1 uncertainty
(FLUXERRAPER6_ch1) (G1)
136-144 E9.3 uJy/pix FCh1 Total 3.6um flux density (FLUXAUTOch1) (G1)
146-153 F8.1 uJy/pix e_FCh1 [0.5/201721] FCh1 uncertainty
(FLUXERRAUTOch1) (G1)
155-158 I4 --- Ch1 [0/149] 3.6um SExtractor Flags
(FLAGS_ch1) (G2)
160-163 I4 --- Ch1b ?=-999 3.6um SExtractor Flags (second value)
(FLAGS_ch1 - second value) (G3)
165-171 E7.2 --- ClCh1 [0/1] 3.6um morphology classification
(1=resolved; 0=extended) (CLASSSTARch1)
173 I1 --- 2MCh1 [0/2]? 3.6um object near a 2MASS bright star?
(1=near a 2MASS bright star) (FLAG2MASSch1)
175-181 F7.2 --- COVCh1 [0/10.2] Number of cBCD coverages
(COV_ch1) (G4)
183-189 F7.2 --- COVCh1b ? Number of cBCD coverages (second value)
(COV_ch1 - second value) (G4)
191 I1 --- HRCh1 [0/2] Most reliable objects
(2=good photometry) (HIGHRELch1)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: spiesch2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.7 deg RAdeg [0/360.1] Right ascension at 4.5um (J2000)
(RA_ch2)
13- 22 F10.7 deg DEdeg [-1.3/1.2] Declination at 4.5um (J2000)
(DEC_ch2)
24- 32 E9.3 uJy/pix Fap1Ch2 4.5um flux density, l.44" radius
(FLUXAPER1_ch2) (G1)
34- 42 E9.3 uJy/pix Fap2Ch2 4.5um flux density, l.92" radius
(FLUXAPER2_ch2) (G1)
44- 52 E9.3 uJy/pix Fap3Ch2 4.5um flux density, 2.89" radius
(FLUXAPER3_ch2) (G1)
54- 62 E9.3 uJy/pix Fap4Ch2 4.5um flux density, 4.08" radius
(FLUXAPER4_ch2) (G1)
64- 72 E9.3 uJy/pix Fap5Ch2 4.5um flux density, 5.76" radius
(FLUXAPER5_ch2) (G1)
74- 82 E9.3 uJy/pix Fap6Ch2 4.5um flux density, 12" radius
(FLUXAPER6_ch2) (G1)
84- 89 F6.1 uJy/pix e_Fap1Ch2 Fap1Ch2 uncertainty (FLUXERRAPER1_ch2) (G1)
91- 96 F6.1 uJy/pix e_Fap2Ch2 Fap2Ch2 uncertainty (FLUXERRAPER2_ch2) (G1)
98-103 F6.1 uJy/pix e_Fap3Ch2 Fap3Ch2 uncertainty (FLUXERRAPER3_ch2) (G1)
105-111 F7.1 uJy/pix e_Fap4Ch2 Fap4Ch2 uncertainty (FLUXERRAPER4_ch2) (G1)
113-119 F7.1 uJy/pix e_Fap5Ch2 Fap5Ch2 uncertainty (FLUXERRAPER5_ch2) (G1)
121-128 F8.1 uJy/pix e_Fap6Ch2 [1/166428] Fap6Ch2 uncertainty
(FLUXERRAPER6_ch2) (G1)
130-138 E9.3 uJy/pix FCh2 Total 4.5um flux density (FLUXAUTOch2) (G1)
140-146 F7.1 uJy/pix e_FCh2 [0.5/10880] FCh2 uncertainty
(FLUXERRAUTOch2) (G1)
148-151 I4 --- Ch2 [0/145] 4.5um SExtractor Flags
(FLAGS_ch2) (G2)
153-156 I4 --- Ch2b ?=-999 4.5um SExtractor Flags (second value)
(FLAGS_ch2 - second value) (G3)
158-164 E7.2 --- ClCh2 [0/1] 4.5um morphology classification
(1=resolved; 0=extended) (CLASSSTARch2)
166 I1 --- 2MCh2 [0/2]? 4.5um object near a 2MASS bright star?
(1=near a 2MASS bright star) (FLAG2MASSch2)
168-174 F7.2 --- COVCh2 [0/10.2] Number of cBCD coverages
(COV_ch2) (G4)
176-182 F7.2 --- COVCh2b ? Number of cBCD coverages (second value)
(COV_ch2 -second value) (G4)
184 I1 --- HRCh2 [0/2] Most reliable objects
(2=good photometry) (HIGHRELch2)
--------------------------------------------------------------------------------
Global notes:
Note (G1): All flux density and flux density error columns have been
converted from MJy/sr to uJy/pixel using Equation (1):
1MJy/steradian=8.46uJy/pixel2
(multiply by the SpIES pixel size of 0.6");
and the first five apertures in each channel have been aperture
corrected using the values in Table 5:
-----------------------------------------------
Band 1.4" 1.9" 2.9" 4.1" 5.8"
-----------------------------------------------
3.6um 0.584 0.732 0.864 0.911 0.950
4.5um 0.570 0.713 0.865 0.906 0.946
-----------------------------------------------
Note (G2): Sextractor Flags (bit values) as below:
1 = The object has neighbors, that significantly bias the photometry, or
bad pixels.
2 = The object was originally blended.
4 = At least one pixel is (nearly) saturated.
8 = The object is truncated (close to image boundary).
16 = Aperture data are incomplete or corrupted.
32 = Isophotal data are incomplete or corrupted.
64 = A memory overflow occurred during deblending.
128 = A memory overflow occurred during extraction.
The last three SExtractor flags do not appear in the SpIES data since
there are no isophotal aperture measurements and a sufficient amount
of memory was allocated for extraction.
Note (G3): Since source extraction was performed on an individual AOR basis, the
sources on the edges of AORs have the potential to be detected twice,
due to the overlap between AORs, and thus both flags were retained
(however there is only one row entry in the catalog for overlapping
objects). Sources that do not overlap have a flag value in the first
array element and were given a value of -999.0 in the second element
in this column to make it clear that this source was detected in only
one AOR.
Note (G4): We report the number of cBCD coverages (from the coverage maps shown
in Figure 2) at the centroid position of each source in the COV
columns. Since AORs overlap, we give an array of two values where, if
the object does not overlap, the second element is left blank.
For the most reliable detection, we recommend using objects that have
greater than two coverages in either entry of the reported array.
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History:
From electronic version of the journal for table 10.
SpIESch1andch220160224.fits.bz2 (spiesall.dat) and other catalogs
downloaded on http://www.physics.drexel.edu/~gtr/spies/
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 30-Sep-2016