J/ApJS/201/34 Swift-INTEGRAL X-ray (SIX) survey (Bottacini+, 2012)
The deep look at the hard X-ray sky: the Swift-INTEGRAL X-ray (SIX) survey.
Bottacini E., Ajello M., Greiner J.
<Astrophys. J. Suppl. Ser., 201, 34 (2012)>
=2012ApJS..201...34B 2012ApJS..201...34B
ADC_Keywords: X-ray sources ; Surveys ; Redshifts ; Cross identifications ;
Active gal. nuclei
Keywords: cosmology: observations - diffuse radiation - galaxies: active -
galaxies: jets - surveys - X-rays: diffuse background
Abstract:
The supermassive black holes at the center of active galactic nuclei
(AGNs) are surrounded by obscuring matter that can block nuclear
radiation. Depending on the amount of blocked radiation, the flux from
the AGN can be too faint to be detected by currently flying hard X-ray
(above 15keV) missions. At these energies only ∼1% of the intensity of
the cosmic X-ray background (CXB) can be resolved into point-like
sources that are AGNs. In this work, we address the question of
undetected sources contributing to the CXB with a very sensitive and
new hard X-ray survey: the Swift-INTEGRAL X-ray (SIX) survey, which is
obtained with the new approach of combining the Swift/BAT and
INTEGRAL/IBIS X-ray observations. We merge the observations of both
missions, which enhances the exposure time and reduces systematic
uncertainties. As a result, we obtain a new survey over a wide sky
area of 6200deg2 that is more sensitive than the surveys of
Swift/BAT or INTEGRAL/IBIS alone. Our sample comprises 113 sources: 86
AGNs (Seyfert-like and blazars), 5 galaxies, 2 clusters of galaxies, 3
Galactic sources, 3 previously detected unidentified X-ray sources,
and 14 unidentified sources. The scientific outcome from the study of
the sample has been properly addressed to study the evolution of AGNs
at redshift below 0.4.
Description:
To obtain the SIX survey, we first perform independent surveys of BAT
and IBIS/ISGRI in the 18-55keV energy range. Then, by combining the
observations of the two instruments, we increase (sum) the exposure
time. In turn the sensitivity of the SIX survey is enhanced. We
compute the survey over a sky area of 6200deg2 that covers the
region of the north ecliptic pole (NEP) extending to the contiguous
Coma region.
For the analysis presented here, we used all the available data for
BAT taken from 2005 March to 2010 March.
We have used all public available data from INTEGRAL pointings as well
as private data (PI: M. Ajello; proposal ID: 05K001) over seven years
from the beginning of the mission (2002) to INTEGRAL revolution 829
(2009).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 107 113 Detected hard X-ray sources
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See also:
J/A+A/545/A101 : Spectra of 29 Swift/BAT optical counterparts (Parisi+, 2012)
J/ApJ/728/58 : Three-year Swift-BAT survey of AGNs (Burlon+, 2011)
J/A+A/510/A48 : Palermo Swift-BAT Hard X-ray Catalogue (Cusumano+, 2010)
J/A+A/520/A47 : Blazars in the Swift-BAT hard X-ray sky (Maselli+, 2010)
J/A+A/524/A64 : The 54-month Palermo BAT-survey catalogue (Cusumano+, 2010)
J/A+A/505/417 : Second INTEGRAL AGN catalogue (Beckmann+, 2009)
J/ApJ/706/L7 : The Fermi LAT sky as seen by INTEGRAL/IBIS (Ubertini+, 2009)
J/ApJ/699/603 : Evolution of Swift/BAT blazars (Ajello+, 2009)
J/ApJ/681/113 : Swift BAT survey of AGNs (Tueller+, 2008)
J/ApJ/678/102 : BAT X-ray survey. I. (Ajello+, 2008)
J/ApJ/633/L77 : SWIFT/BAT detections of AGN (Markwardt+, 2005)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 8 F8.4 deg RAdeg Right ascension (J2000)
10- 18 F9.5 deg DEdeg Declination (J2000)
20- 42 A23 --- xid Optical counterpart name
44- 49 F6.2 fW/m2 Flux [3.97/239] Hard X-ray flux (18-55keV;
in units of 10-12erg/cm2/s)
51- 56 F6.2 --- S/N [4.8/222] Signal to noise ratio
58- 71 A14 --- Class Object class (Gal. int. = Galaxy interacting)
73- 86 A14 --- Type Object type (Gal. int. = Galaxy interacting)
88- 93 F6.4 --- z [0/1.18]? Redshift
95- 99 F5.2 [10-7W] Lum [38.64/47.14]? Log of X-ray luminosity
101-105 F5.2 [cm-2] logNH [19.06/24.7]? Galactic column hydrogen density
107 I1 --- r_logNH [1/9]? Reference (1)
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Note (1): Reference as follows:
1 = This work (Cat. J/ApJS/201/34);
2 = Burlon et al. 2011, Cat. J/ApJ/728/58;
3 = Tueller et al. 2008, Cat. J/ApJ/681/113;
4 = Cappi et al. 2006A&A...446..459C 2006A&A...446..459C;
5 = Page et al. 2005MNRAS.364..195P 2005MNRAS.364..195P;
6 = Winter et al. 2008ApJ...674..686W 2008ApJ...674..686W;
7 = Shu et al. 2007ApJ...657..167S 2007ApJ...657..167S;
8 = Dadina et al. 2010A&A...516A...9D 2010A&A...516A...9D;
9 = Comastri et al. 2010ApJ...717..787C 2010ApJ...717..787C
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Nomenclature Notes:
In table 2, objects are <[BAG2012] DDD.dddd+DD.ddddd> in Simbad.
History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 25-Jan-2013