J/ApJ/814/11 Obscured AGNs from XMM-Newton and AKARI (Terashima+, 2015)
A new sample of obscured AGNs selected from the XMM-Newton and AKARI surveys.
Terashima Y., Hirata Y., Awaki H., Oyabu S., Gandhi P., Toba Y.,
Matsuhara H.
<Astrophys. J., 814, 11 (2015)>
=2015ApJ...814...11T 2015ApJ...814...11T (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; X-ray sources ; Galaxies, IR ; Surveys ;
Redshifts ; Cross identifications
Keywords: galaxies: active; infrared: galaxies; X-rays: galaxies
Abstract:
We report a new sample of obscured active galactic nuclei (AGNs)
selected from the XMM-Newton serendipitous source and AKARI
point-source catalogs. We match X-ray sources with infrared (18 and
90µm) sources located at |b|>10° to create a sample consisting
of 173 objects. Their optical classifications and absorption column
densities measured by X-ray spectra are compiled and study efficient
selection criteria to find obscured AGNs. We apply the criteria (1)
X-ray hardness ratio defined by using the 2-4.5keV and 4.5-12keV bands
>-0.1 and (2) EPIC-PN count rate (CR) in the 0.2-12keV to infrared
flux ratio CR/F90<0.1 or CR/F18<1 where F18 and F90 are
infrared fluxes at 18 and 90µm in Jy, respectively, to search for
obscured AGNs. X-ray spectra of 48 candidates, for which no X-ray
results have been published, are analyzed and X-ray evidence for the
presence of obscured AGNs such as a convex shape X-ray spectrum
indicative of absorption of NH∼1022-24/cm2, a very flat continuum,
or a strong Fe-K emission line with an equivalent width of >700eV is
found in 26 objects. Six of them are classified as Compton-thick AGNs,
and four are represented by either Compton-thin or Compton-thick
spectral models. The success rate of finding obscured AGNs combining
our analysis and the literature is 92% if the 18µm condition is
used. Of the 26 objects, 4 are optically classified as an HII nucleus
and are new "elusive AGNs" in which star formation activity likely
overwhelms AGN emission in the optical and infrared bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 176 173 XMM + AKARI 18 micron and 90 micron sample
table2.dat 77 266 X-ray and infrared luminosities
table3.dat 176 81 XMM + AKARI 90 micron sample
table4.dat 176 10 XMM + AKARI 18 micron sample
table5.dat 99 48 Log of XMM-Newton observations
refs.dat 92 178 References
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See also:
B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2012)
IX/46 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR5 (XMM-SSC, 2016)
IX/44 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR4 (XMM-SSC, 2013)
IX/41 : XMM-Newton Serendipitous Source Catalogue 2XMMi-DR3 (XMM-SSC, 2010)
II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)
VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)
VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003)
VII/224 : Quasars and Active Galactic Nuclei (10th Ed.) (Veron+ 2001)
J/ApJS/207/36 : 2nd MAXI/GSC cat. in high galactic-latitude sky (Hiroi+, 2013)
J/MNRAS/426/2522 : FeK lines in Seyfert 1 galaxies (Patrick+, 2012)
J/A+A/545/A101 : Spectra of 29 Swift/BAT optical counterparts (Parisi+, 2012)
J/ApJ/754/45 : IR properties of Swift/BAT X-ray AGNs (Ichikawa+, 2012)
J/ApJ/753/104 : AGN identifications from AKARI and Swift (Matsuta+, 2012)
J/MNRAS/414/3084 : Multi-waveband analysis of 12um galaxies (Brightman+, 2011)
J/A+A/530/A42 : X-ray properties of AGNs in XBS (Corral+, 2011)
J/MNRAS/413/1206 : XMM survey of 12um selected galaxies (Brightman+, 2011)
J/ApJ/728/58 : Swift-BAT survey of AGNs (Burlon+, 2011)
J/ApJ/709/884 : Role of starburst-AGN composites in LIRG mergers (Yuan+, 2010)
J/AJ/138/332 : LEDA CMD/tip of the red giant branch (Jacobs+, 2009)
J/MNRAS/392/1509 : Distribution of AGNs in galaxy clusters (Gilmour+, 2009)
J/A+A/493/339 : XMM-Newton serendipitous Survey. V. (Watson+, 2009)
J/ApJ/663/81 : SED of hard X-ray selected AGN in XMDS (Polletta+, 2007)
J/MNRAS/375/931 : Radio sources in the 6dFGS (Mauch+, 2007)
J/PASJ/58/931 : X-ray sources in A194 and A1060 (Hudaverdi+, 2006)
J/ApJ/648/111 : Chandra sources near AGNs (Levenson+, 2006)
J/ApJS/161/185 : GIS catalog project : source catalog II (Ueda+, 2005)
J/ApJ/624/135 : Phoenix Deep Survey spectroscopic catalog (Afonso+, 2005)
J/ApJ/616/707 : Circumnuclear structure of NICMOS galaxies (Hunt+, 2004)
J/ApJ/596/944 : SEXSI catalog (Harrison+, 2003)
J/AJ/126/1750 : Seyfert population in SSRS2 (Maia+, 2003)
J/A+A/393/57 : Velocity field in the Local Group (Terry+, 2002)
J/A+A/368/797 : Soft X-ray properties of Seyfert galaxies (Pfefferkorn+, 2001)
J/ApJS/132/37 : Spectroscopy of Southern warm IR galaxies (Kewley+, 2001)
J/ApJ/522/113 : 1Jy IRAS galaxies optical spectroscopy (Veilleux+, 1999)
J/PASP/111/438 : Updated Zwicky catalog (UZC) (Falco+, 1999)
J/A+AS/135/437 : AGNs with composite spectra. II. (Goncalves+ 1999)
J/A+AS/132/181 : Very luminous IRAS galaxies spectra. II. (Wu+ 1998)
Byte-by-byte Description of file: table[134].dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- XMM XMM identifier
(2XMM or 2XMMi JHHMMSS.s+DDMMSS)
24- 47 A24 --- Name Common identifier
49- 63 A15 --- OName Other common identifier
65 A1 --- f_OName [c] Flag on OName (G1)
67- 75 F9.6 --- z [-0.0008/0.4]? Spectrocopic redshift
77- 82 F6.3 s-1 CR [0.002/36] XMM/EPIC-PN 0.2-12keV count rate
84- 89 F6.3 --- HR4 ? XMM/EPIC-PN hardness ratio (1)
91- 96 F6.3 Jy F18 [0.1/72.3]? AKARI 18 micron flux density
98-104 F7.3 Jy F90 [0.3/202.6]? AKARI 90 micron flux density
106-112 F7.4 --- CR/F18 [0.003/79.2]? XMM count rate to AKARI
19 micron flux ratio
114-122 F9.6 --- CR/F90 [0/44.2]? XMM count rate to AKARI
91 micron flux ratio
124-133 A10 --- OType Optical classification
(L=LINER, T=transition object)
135-137 I3 --- r_OType [1/608]? Reference code for OType
(see refs.dat file)
139 A1 --- l_NH Limit flag on NH
140-147 F8.4 10+22/cm2 NH [0.007/371.5]? Hydrogen column density
149-156 F8.3 10+22/cm2 E_NH [0.01/2230]? Upper uncertainty in NH (3)
158-164 F7.3 10+22/cm2 e_NH [0.006/123]? Lower uncertainty in NH (3)
166 A1 --- f_NH [a-e] Flag on NH (2)
168-172 A5 --- Cl X-ray class (4)
174-176 I3 --- r_Cl [101/706]? Reference code for Cl
(see refs.dat file)
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Note (1): [CR(4.5-12keV)-CR(2.0-4.5keV)]/[CR(4.5-12keV)+CR(2.0-4.5)].
Note (2): Flag on NH as follows:
a = X-ray spectrum shows no evidence for significant absorption.
b = Compton thick candidates judged from a large Fe-K line EW (>700eV)
and/or flat continuum.
d = Compton thin candidates in Severgnini et al. (2012A&A...542A..46S 2012A&A...542A..46S).
e = Compton thick candidates in Severgnini et al. (2012A&A...542A..46S 2012A&A...542A..46S).
Note (3): When e_NH is blank but a E_NH value is given then it is the NH
uncertainty.
Note (4): Classification of absorption measured with X-ray as follows:
Un = unabsorbed or slightly absorbed (NH<1022/cm2),
Thin = Compton-thin (NH=1022-1.5x1024/cm2),
Thick = Compton-thick (NH>1.5x1024/cm2).
If only the lower limit of NH=1024/cm2 is obtained, such
objects are regarded as Compton-thick.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 24 A24 --- Name Source identifier
26- 40 A15 --- OName Other name
42 A1 --- f_OName [c] Flag on OName (G1)
44- 49 F6.3 [10-7W] logLX [38.8/45.8]? Log 2-10keV X-ray luminosity
51- 53 A3 --- r_logLX Reference code for logLX
(see #201-217 in refs.dat file) (1)
55- 60 F6.3 [10-7W] logL18 [41.2/46.1]? Log AKARI 18 micron luminosity
62- 67 F6.3 [10-7W] logL90 [41.6/46.1]? Log AKARI 90 micron luminosity
69- 73 F5.2 Mpc Dist [3.3/27.7]? Distance (2)
75- 77 I3 --- r_Dist [301/316]? Reference code for Dist
(see refs.dat file)
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Note (1):
a = X-ray spectra are analyzed in this paper, and no clear evidence for
the presence of an obscured AGN is found.
Note (2): For nearby objects used to calculate luminosities.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 24 A24 --- Name Target name
26- 40 A15 --- OName Other name
42- 46 A5 --- Set IR sample
48- 52 A5 --- TT Morphological Hubble type taken from HyperLeda
54- 61 F8.6 --- z [0.002/0.2]? Spectroscopic redshift (1)
63- 68 F6.4 --- E_z [0.007/0.02]? Positive error on z (1)
70- 75 F6.4 --- e_z [0.006/0.02]? Negative error on z (1)
77- 83 F7.5 --- NH [0.007/0.3] Galactic Hydrogen column density
85- 94 I010 --- ObsID [12440101/555020201] XMM-Newton Obsno
96- 99 F4.1 s Exp [2.7/71] Net exposure
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Note (1): The redshift with errors are determined from Fe-K line.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ref [1/706] Reference code
5- 28 A24 --- Aut Author's name(s)
30- 48 A19 --- BibCode Bibcode
50- 92 A43 --- Comm Comment
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Global notes:
Note (G1):
c = There are two IRC sources corresponding to NGC 3690E and NGC 3690W.
The nucleus of NGC 3690W is likely to be an obscured AGN
(Zezas et al. 2003ApJ...594L..31Z 2003ApJ...594L..31Z), and the 18 micron flux of
NGC 3690W is shown. FIS does not resolve the two sources and the
90 micron flux is for the single FIS source.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Feb-2016