J/ApJ/753/104 AGN identifications from AKARI and Swift (Matsuta+, 2012)
Infrared and hard X-ray diagnostics of active galactic nucleus identification
from the Swift/BAT and AKARI all-sky surveys.
Matsuta K., Gandhi P., Dotani T., Nakagawa T., Isobe N., Ueda Y.,
Ichikawa K., Terashima Y., Oyabu S., Yamamura I., Stawarz L.
<Astrophys. J., 753, 104 (2012)>
=2012ApJ...753..104M 2012ApJ...753..104M
ADC_Keywords: Active gal. nuclei ; Photometry, infrared ; X-ray sources ;
Surveys
Keywords: galaxies: active; infrared: galaxies; X-rays: galaxies
Abstract:
We combine data from two all-sky surveys in order to study the
connection between the infrared and hard X-ray (>10keV) properties for
local active galactic nuclei (AGNs). The Swift Burst Alert Telescope
all-sky survey provides an unbiased, flux-limited selection of hard
X-ray-detected AGNs. Cross-correlating the 22 month hard X-ray survey
(Tueller et al. 2010, Cat. J/ApJS/186/378) with the AKARI all-sky
survey (AKARI/PSCs; Ishihara et al. 2010, Cat. II/297; Yamamura et al.
2010, Cat. II/298), we studied 158 AGNs detected by the AKARI
instruments. We find a strong correlation for most AGNs between the
infrared (9, 18, and 90µm) and hard X-ray (14-195keV) luminosities,
and quantify the correlation for various subsamples of AGNs. Partial
correlation analysis confirms the intrinsic correlation after removing
the redshift contribution. The correlation for radio galaxies has a
slope and normalization identical to that for Seyfert 1 galaxies,
implying similar hard X-ray/infrared emission processes in both. In
contrast, Compton-thick (CT) sources show a large deficit in the hard
X-ray band, because high gas column densities diminish even their hard
X-ray luminosities. We propose two photometric diagnostics for source
classification: one is an X-ray luminosity versus infrared color
diagram, in which type 1 radio-loud AGNs are well isolated from the
others in the sample. The other uses the X-ray versus infrared color
as a useful redshift-independent indicator for identifying CT AGNs.
Importantly, CT AGNs and starburst galaxies in composite systems can
also be differentiated in this plane based upon their hard X-ray
fluxes and dust temperatures. This diagram may be useful as a new
indicator to classify objects in new and upcoming surveys such as WISE
and NuSTAR.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 104 158 AKARI infrared properties of the AGN in the
22 month Swift/BAT catalog
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See also:
II/298 : AKARI/FIS All-Sky Survey Point Source Catalogues (ISAS/JAXA, 2010)
II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
J/A+A/561/A67 : Palermo BAT cat. sources classification (Parisi, 2014)
J/ApJS/208/24 : Spitzer MIR AGN survey. I. (Lacy+, 2013)
J/ApJS/207/19 : Hard X-ray survey from Swift-BAT 6-yr (Baumgartner+, 2013)
J/ApJ/754/45 : IR properties of Swift/BAT X-ray AGNs (Ichikawa+, 2012)
J/ApJ/749/21 : AGNs detected by 60 month Swift/BAT survey (Ajello+, 2012)
J/A+A/525/A127 : Properties of X-ray selected AGNs (Tasse+, 2011)
J/ApJ/728/58 : Swift-BAT survey of AGNs (Burlon+, 2011)
J/ApJS/186/378 : Hard X-ray survey from Swift-BAT 2004-2006 (Tueller+, 2010)
J/ApJ/708/584 : SEXSI Spitzer catalog (Eckart+, 2010)
J/ApJ/681/113 : Swift BAT survey of AGNs (Tueller+, 2008)
J/ApJ/678/102 : BAT X-ray survey. I. (Ajello+, 2008)
J/A+A/467/585 : Sources detected by ISGRI (Bodaghee+, 2007)
J/ApJ/633/L77 : SWIFT/BAT detections of AGN (Markwardt+, 2005)
J/A+A/418/465 : Mid-infrared and hard X-ray emission in AGN (Lutz+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/158] Running sequential number
5- 7 I3 --- SWIFT [1/473] BAT number (1)
9- 33 A25 --- Name Object name
35- 39 I5 mJy F09 ? AKARI/S9W 9um flux
41- 46 F6.1 mJy e_F09 ? F09 uncertainty
48- 52 I5 mJy F18 ? AKARI/L18W 18um flux
54- 57 I4 mJy e_F18 ? F18 uncertainty
59- 64 I6 mJy F90 ? AKARI/WIDE-S 90um flux
66- 70 I5 mJy e_F90 ? F90 uncertainty
72- 76 F5.2 [10-7W] logLX [41.1/47.4] Log of hard X-ray luminosity
(14-195keV) (2)
78- 81 F4.2 [10-7W] e_logLX logLX uncertainty
83- 88 F6.4 --- z [0.001/0.9] Redshift
90-102 A13 --- Type Optical AGN type (3)
104 A1 --- r_Type Reference of Type if not Tueller (4)
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Note (1): Object number in the 22 month Swift/BAT hard X-ray survey catalog
(Tueller et al. 2010, Cat. J/ApJS/186/378; in Simbad).
Note (2): The logarithmic luminosity and error in hard X-ray band (14-195keV)
taken from Tueller et al. (2010, Cat. J/ApJS/186/378), in units of erg/s.
Note (3): Optical AGN type taken from Tueller et al. (2010, J/ApJS/186/378)
or from other literature sources indicated in r_Type. The types are:
* Blazar: Blazar/BL Lac or Blazar/FSRQ (Flat Spectrum Radio Quiet)
* LINER (Low-Ionization Nuclear Emission-line Regions); LINER/CT for
Compton-thick LINERs.
* Seyferts: Sy1 or Sy2 (intermediate classes 1.2, 1.5, 1.8 and 1.9);
CT stands for Compton-thick, RL=radio loud, RIM=radio-intermediate
Note (4): Reference as follows:
a = Veron-Cetty & Veron (2010, Cat. VII/258);
b = Moorwood et al. (1996A&A...308L...1M 1996A&A...308L...1M);
c = Bodaghee et al. (2007, Cat. J/A+A/467/585);
d = Matt et al. (2000MNRAS.318..173M 2000MNRAS.318..173M).
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 17-Feb-2014