J/A+A/637/A52 Deep Chandra survey in J1030+0524 field (Nanni+, 2020)
The deep Chandra survey in the SDSS J1030+0524 field.
Nanni R., Gilli R., Vignali C., Mignoli M., Peca A., Marchesi S.,
Annunziatella M., Brusa M., Calura F., Cappelluti N., Chiaberge M.,
Comastri A., Iwasawa K., Lanzuisi G., Liuzzo E., Marchesini D., Prandoni I.,
Tozzi P., Vito F., Zamorani G., Norman C.
<Astron. Astrophys. 637, A52 (2020)>
=2020A&A...637A..52N 2020A&A...637A..52N (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Active gal. nuclei ; X-ray sources
Keywords: surveys - X-rays: general - catalogs - galaxies: high-redshift -
quasars: supermassive black holes
Abstract:
We present the X-ray source catalog for the 479ks Chandra exposure of
the SDSS J1030+0524 field, that is centered on a region that
shows the best evidence to date of an overdensity around a z>6 quasar,
and also includes a galaxy overdensity around a Comptonthick
Fanaro-Riley type II (FRII) radio galaxy at z=1.7. Using wavdetect for
initial source detection and ACIS Extract for source photometry and
significance assessment, we create preliminary catalogs of sources
that are detected in the full (0.5-7.0keV), soft (0.5-2.0keV), and
hard (2-7keV) bands, respectively. We produce X-ray simulations that
mirror our Chandra observation to filter our preliminary catalogs and
get a completeness level of > 91% and a reliability level of 95% in
each band. The catalogs in the three bands are then matched into a
final main catalog of 256 unique sources. Among them, 244, 193, and
208 are detected in the full, soft, and hard bands, respectively. The
Chandra observation covers a total area of 335 arcmin2, and reaches
flux limits over the central few square arcmins of ∼3x10-16,
6x10-17, and 2x10-16erg/cm2/s in the full, soft, and hard bands,
respectively This makes J1030 field the fifth deepest extragalactic
X-ray survey to date. The field is part of the Multiwavelength Survey
by Yale-Chile (MUSYC), and is also covered by optical imaging data
from the Large Binocular Camera (LBC) at the Large Binocular Telescope
(LBT), near-IR imaging data from the Canada France Hawaii Telescope
WIRCam (CFHT/WIRCam), and Spitzer IRAC. Thanks to its dense
multi-wavelength coverage, J1030 represents a legacy field for the
study of large-scale structures around distant accreting supermassive
black holes. Using a likelihood ratio analysis, we associate
multi-band (r, z, J, and 4.5um) counterparts for 252 (98.4%) of the
256 Chandra sources, with an estimated reliability of 95%. Finally, we
compute the cumulative number of sources in each X-ray band, finding
that they are in general agreement with the results from the Chandra
Deep Fields.
Description:
The SDSS J1030+0524 field was observed by Chandra with ten different
pointings between January and May 2017 for a total exposure of 479ks.
X-ray source catalog for the deep Chandra survey in the SDSS
J1030+0524 field, centered on a region that shows the best evidence to
date of an overdensity around a z∼6 and an overdensity of galaxies at
z=1.7.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 455 256 Chandra source catalog (table 4)
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-2014)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- XID [1/388] ID of the X-ray source
5- 6 I2 h RAh X-ray right ascension (J2000)
7 A1 --- --- [:]
8- 9 I2 min RAm X-ray right ascension (J2000)
10 A1 --- --- [:]
11- 15 F5.2 s RAs X-ray right ascension (J2000)
17 A1 --- DE- X-ray declination sign (J2000)
18- 19 I2 deg DEd X-ray declination (J2000)
20 A1 --- --- [:]
21- 22 I2 arcmin DEm X-ray declination (J2000)
23 A1 --- --- [:]
24- 28 F5.2 arcsec DEs X-ray declination (J2000)
30- 33 F4.2 arcsec ePos Positional error of the source centroid (1)
35- 39 F5.2 arcmin OffAxis Off axis angle
41- 43 I3 ks Exp Exposure time in the full band
45- 49 F5.2 --- HR ?=-1 Hardness ratio (2)
51- 55 F5.2 --- E_HR ?=-1 Hardness ratio error (upper value)
57- 61 F5.2 --- e_HR ?=-1 Hardness ratio error (lower value)
63- 69 F7.2 ct Fct Full (0.5-7keV) net counts (3)
71- 75 F5.2 ct E_Fct ?=-1 Full net counts error (upper value),
1 sigma level using Gehrels
(1986ApJ...303..336G 1986ApJ...303..336G)
77- 81 F5.2 ct e_Fct ?=-1 Full net counts error (lower value),
1 sigma level using Gehrels
(1986ApJ...303..336G 1986ApJ...303..336G)
83- 89 F7.2 ct Sct Soft (0.5-2keV) net counts (3)
91- 95 F5.2 ct E_Sct ?=-1 Soft net counts error (upper value),
1 sigma level using Gehrels
(1986ApJ...303..336G 1986ApJ...303..336G)
97-101 F5.2 ct e_Sct ?=-1 Soft net counts error (lower value),
1 sigma level using Gehrels
(1986ApJ...303..336G 1986ApJ...303..336G)
103-108 F6.2 ct Hct Hard net counts (3)
110-114 F5.2 ct E_Hct ?=-1 Hard net counts error (upper value),
1 sigma level using Gehrels
(1986ApJ...303..336G 1986ApJ...303..336G)
116-120 F5.2 ct e_Hct ?=-1 Hard net counts error (lower value),
1 sigma level using Gehrels
(1986ApJ...303..336G 1986ApJ...303..336G)
122-135 E14.9 --- PnsF ?=-1 AE binomial probability for a source to
be a background fluctuation n the
Full (0.5-7keV) (4)
137-149 E13.9 --- PnsS ?=-1 AE binomial probability for a source to
be a background fluctuation in
Soft (0.5-2keV) band (4)
151-163 E13.9 --- PnsH ?=-1 AE binomial probability for a source to
be a background fluctuation in
Hard (2-7keV) band (4)
165-186 E22.17 mW/m2 FF Aperture corrected X-ray flux in
Full (0.5-7keV) band (5)
188-196 E9.4 mW/m2 E_FF ?=-1 Full band flux error (upper value)
198-206 E9.4 mW/m2 e_FF ?=-1 Full band flux error (lower value)
208-229 E22.17 mW/m2 FS Aperture corrected X-ray flux in
Soft (0.5-2keV) band (5)
231-239 E9.4 mW/m2 E_FS ?=-1 Soft band flux error (upper value)
241-249 E9.4 mW/m2 e_FS ?=-1 Soft band flux error (lower value)
251-272 E22.17 mW/m2 FH Aperture corrected X-ray flux in
Hard (2-7keV) band (5)
274-282 E9.4 mW/m2 E_FH ?=-1 Hard band flux error (upper value)
284-292 E9.4 mW/m2 e_FH ?=-1 Hard band flux error (lower value)
294-295 I2 h RAOh ? Optical right ascension (J2000)
296 A1 --- --- [:]
297-298 I2 min RAOm ? Optical right ascension (J2000)
299 A1 --- --- [:]
300-304 F5.2 s RAOs ? Optical right ascension (J2000)
306 A1 --- DEO- Optical declination sign (J2000)
307-308 I2 deg DEOd ? Optical declination (J2000)
309 A1 --- --- [:]
310-311 I2 arcmin DEOm ? Optical declination (J2000)
312 A1 --- --- [:]
313-317 F5.2 arcsec DEOs ? Optical declination (J2000)
319-338 F20.18 arcsec OffXO ? Positional offset between the X-ray and
optical position
340-348 F9.6 mag rmag Counterpart magnitude AUTO in the
LBT/LBC r band (6)
350-357 F8.5 mag zmag Counterpart magnitude AUTO in the
LBT/LBC z band (6)
359-367 F9.6 mag Jmag Counterpart magnitude AUTO in the
CFHT/WIRCam J band (6)
369-377 F9.6 mag [4.5] Counterpart magnitude AUTO in the
Spitzer IRAC, 4.5um band (6)
379-391 F13.10 mag e_rmag ?=-1 Magnitude in r band error
393-413 E21.19 mag e_zmag ?=-1 Magnitude in z band error
415-426 E12.10 mag e_Jmag ?=-1 Magnitude in J band error
428-448 E21.19 mag e_[4.5] ?=-1 Magnitude in 4.5um band error
450-453 F4.1 --- Flag1 [-1/2] Flag providing info on the likelihood
of the counterparts (7)
455 I1 --- Flag2 [0/2] Flag notes for the single XID
sources (8)
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Note (1): positional error of the source centroid computed using
Puccetti et al. (2009ApJS..185..586P 2009ApJS..185..586P) formula.
Note (2): Computed as Lyons 1991 (Cambridge University Press).
For upper and lower limits on HR we put "-1" values on the errors.
For the 11 sources with only full-band detection we did not compute the HR.
Note (3): Upper limits are at 3 sigma level computed using the Chandra/CIAO
srcflux tool; for the upper limits we put "-1" values on the errors.
Note (4): The lower is the value the more likely the source is real.
Note (5): For undetected sources we report 3-sigma upper limits
Fluxes and relative errors were computed from the net rates and relative
errors assuming the full-band spectra of the X-ray sources are power-laws
modified by only Galactic absorption with effective power-law photon indices
derived from their hardness ratios.
For the sources not detected in all the three X-ray bands we assumed a
spectral power-law with Gamma=1.4 modified by Galactic absorption.
Note (6): The reported limits (error at "-1") for the undetected counterparts
correspond to the limiting AB magnitudes of the corresponding
optical/NIR catalog.
Note (7): Flag as follows:
-1 = X-ray sources with no counterpart in any band
0 = sources with a sub-threshold counterpart
1 = sources with just one counterpart above likelihood threshold
2 = sources with two or more counterparts above threshold
Note (8): Flag as follows:
0 = sources with no morphological info
1 = sources that have a star as optical/NIR counterpart
2 = sources that appears as X-ray extended sources
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Acknowledgements:
Riccardo Nanni, riccardo.nanni7(at)unibo.it
(End) Patricia Vannier [CDS] 06-Apr-2020