J/A+A/689/A83 Chandra source identifications in AKARI NEPD (Miyaji+, 2024)
Chandra Survey in the AKARI deep field at the North Ecliptic Pole.
Optical and near-infrared identifications of X-ray sources.
Miyaji T, Bravo-Navarro B.A., Diaz Tello J., Krumpe M., Herrera-Endoqui M.,
Ikeda H., Takagi T., Oi N., Shogaki A., Matsuura S., Kim H., Malkan, M.A.,
Hwang H.S., Kim T., Ishigaki T., Hanami H., Kim S.J., Ohyama Y., Goto T.,
Matsuhara H.
<Astron. Astrophys. 689, A83 (2024)>
=2024A&A...689A..83M 2024A&A...689A..83M (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Active gal. nuclei ; X-ray sources ; Galaxies, Seyfert ;
Galaxies, spectra ; Galaxy catalogs ; QSOs ; Redshifts
Keywords: methods: data analysis - catalogs - surveys - galaxies: active -
X-ray: galaxies
Abstract:
We present a catalog of optical and infrared identifications (ID) of
X-ray sources in the {AKARI} North Ecliptic Pole (NEP) Deep field
detected with Chandra covering ∼0.34deg2 with 0.5-2keV flux limits
ranging ∼2-20*10-16erg/s/cm2.
The optical/near-infrared counterparts of the X-ray sources are taken
from our Hyper Suprime Cam (HSC)/Subaru and Wide-Field InfraRed Camera
(WIRCam)/Canada-France-Hawaii Telescope (CFHT) data because these
have much more accurate source positions due to their spatial
resolution than that of Chandra and longer wavelength infrared data.
We concentrate our identifications in the HSC g band and WIRCam Ks
band-based catalogs. To select the best counterpart, we utilize a
novel extension of the likelihood-ratio (LR) analysis, where we use
the X-ray flux as well as g-Ks colors to calculate the likelihood
ratio. Spectroscopic and photometric redshifts of the counterparts are
summarized. Also, simple X-ray spectroscopy is made on the sources
with sufficient source counts.
We present the resulting catalog in an electronic form. The main ID
catalog contains 403 X-ray sources and includes X-ray fluxes,
luminosities, g and Ks band magnitudes, redshifts and their sources,
optical spectroscopic properties, as well as intrinsic absorption
column densities and power-law indices from simple X-ray spectroscopy.
The identified X-ray sources include 27 Milky-Way objects, 57 type I
AGNs, 131 other AGNs, and 15 galaxies. The catalog serves as a basis
for further investigations of the properties of the X-ray and
near-infrared sources in this field.
We present a catalog of optical g band and near-infrared (Ks band
identifications of Chandra X-ray sources in the AKARI NEP Deep field
with available optical/near-infrared spectroscopic features and
redshifts as well as the results of simple X-ray spectroscopy. During
the process, we develop a novel X-ray flux-dependent likelihood-ratio
analysis for selecting the most likely counterparts among candidates.
Description:
Otical (g) and near-infrared (Ks) identifications and results of
simple X-ray spectral analysis of the Chandra X-ray sources in the
AKARI NEP Deep Field. The identifications are based on a novel X-ray
flux dependent two-band likelihood-ratio (LR) technique.
table2 list the main ID table listing the first candidates, table3
list of second and third candidates above the LR threshold defined
in the paper and tablea2 list results of associated optical
spectroscopic programs using the Gran Telescopio Canarias (GTC) and
Large Binocular Telescope (LBT).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 489 403 Main ID table listing the first candidates
table3.dat 96 32 Second and third candidates above the LR threshold
tablea2.dat 189 245 Results of associated optical spectroscopic
programs using the Gran Telescopio Canarias (GTC)
and Large Binocular Telescope (LBT)
--------------------------------------------------------------------------------
See also:
J/MNRAS/446/911 : X-ray sources in the AKARI NEP deep field (Krumpe+, 2015)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- CXOName X-ray source name (ANEPD-CXONNN)
14- 22 F9.5 deg RAdeg X-ray source right ascension (J2000)
24- 31 F8.5 deg DEdeg X-ray source declination (J2000)
33- 36 F4.2 arcsec ePos X-ray source position error
38- 49 E12.6 mW/m2 F05-7 X-ray flux in 0.5-7keV band
51- 62 E12.6 mW/m2 e_F05-7 X-ray flux 1 sigma error 0.5-7keV band
64- 75 E12.6 mW/m2 F05-2 X-ray flux in 0.5-2keV band
77- 88 E12.6 mW/m2 e_F05-2 X-ray flux 1 sigma error in 0.5-2keV band
90-101 E12.6 mW/m2 F2-7 X-ray flux in 2-7keV band
103-114 E12.6 mW/m2 e_F2-7 X-ray flux 1 sigma error in 2-7keV band
116-118 A3 --- r_PosID Reference for first ID candidate position
(Ga for Gaia, HSC or Ks for WIRCam)
120-128 F9.5 deg RAIdeg Right ascension (J2000)
of the first ID candidate
130-137 F8.5 deg DEIdeg Declination (J2000)
of the first ID candidate
139-142 F4.2 arcsec IDSep Separation from X-ray position
144-150 F7.3 mag gmag ?=-9.99 HSC g magnitude (AB)
152-160 F9.6 mag e_gmag ?=-9.99 HSC g magnitude error
162-167 F6.2 mag Ksmag ?=-9.99 WIRCam Ks magnitude (AB)
169-177 F9.6 mag e_Ksmag ?=-9.99 WIRCam Ks magnitude error
179-184 F6.2 mag Gmag ?=-9.99 Gaia G magnitude
186-190 A5 --- GaiaMW [false/true ] MW flag based on Gaia (G1)
192-203 E12.6 --- LR Likelihood ratio
205-212 F8.4 --- zsp ?=-99.999 Spectroscopic redshift
214-216 A3 --- q_zsp Spectroscopic redshift quality flag (1)
218-236 A19 --- r_zsp Reference of zsp (2)
238-242 A5 --- Class Object class (CLASS)
244-249 F6.4 --- zph ?=- Best fit photo-z from Oi et al.,
2021MNRAS.500.5024O 2021MNRAS.500.5024O
251-252 I2 --- zphMod ?=- Best fit template ID from Oi et al.,
2021MNRAS.500.5024O 2021MNRAS.500.5024O
254-263 F10.6 --- znom ?=-99.99 Adopted nominal redshift (3)
265-375 A111 --- ComOptIR Comments from opt/IR
377-386 F10.6 10+22cm-2 NH ?=- Intrinsic N_H from X-ray spectro
388-396 F9.6 10+22cm-2 b_NH ?=- Lower bound to NH 90% error
398-403 F6.2 10+22cm-2 B_NH ?=- Upper bound to NH 90% error
405-407 F3.1 --- Gamma ?=- Photon index of the Chandra source
409-413 A5 --- b_Gamma [- ] Lower bound to Gamma 90% error
415-419 A5 --- B_Gamma [- ] Upper bound to Gamma 90% error
421-426 F6.2 [10-7W] logLXraw ?=- Log raw 0.5-7keV luminosity
428-432 F5.2 [10-7W] logLXint ?=- Log intrinsic 2-10keV luminosity (4)
434-438 F5.2 [10-7W] b_logLXint ?=- Lower bound to logLXint 90% error
440-444 F5.2 [10-7W] B_logLXint ?=- Upper bound to logLXint 90% error
446-489 A44 --- ComX Comments for X-ray Spectroscopy
--------------------------------------------------------------------------------
Note (1): Quality flag as follows:
A = flagged excellent/best
AB = flagged excellent/best or good
B = flagged good
C = one identified feature
P = redshift based on PAH lines
X = source literature or database does not give any quality indicator
Note (2): References as follows:
DEI08 = Keck Deimos observations in 2008/2011 (Churei 2013, Master's
thesis, Tokyo Institute of Technology, (in Japanese);
Shogaki 2018, Master's thesis, Kwansei Gakuin University,
(in Japanese))
DEI11 = Keck Deimos observations in 2008/2011 (Churei 2013, Master's
thesis, Tokyo Institute of Technology, (in Japanese);
Shogaki 2018, Master's thesis, Kwansei Gakuin University,
(in Japanese))
DEI11o = Keck Deimos observations in 2008/2011 (Churei 2013, Master's
thesis, Tokyo Institute of Technology, (in Japanese);
Shogaki 2018, Master's thesis, Kwansei Gakuin University,
(in Japanese))
DEI11s = Keck Deimos observations in 2008/2011 (Churei 2013, Master's
thesis, Tokyo Institute of Technology, (in Japanese);
Shogaki 2018, Master's thesis, Kwansei Gakuin University,
(in Japanese))
DEI14 = Keck Deimos or Mosfire observations in Gioia et al.,
2003ApJS..149...29G 2003ApJS..149...29G, Cat. J/ApJS/149/29)
DEI15 = Keck Deimos or Mosfire observations in Gioia et al.,
2003ApJS..149...29G 2003ApJS..149...29G, Cat. J/ApJS/149/29)
DEI16 = Keck Deimos or Mosfire observations in Gioia et al.,
2003ApJS..149...29G 2003ApJS..149...29G, Cat. J/ApJS/149/29)
DEI21 = Keck Deimos or Mosfire observations in Gioia et al.,
2003ApJS..149...29G 2003ApJS..149...29G, Cat. J/ApJS/149/29
FMOD12 = Subaru FMOD observations in 2012 (Oi et al., 2017PASJ...69...70O 2017PASJ...69...70O)
FMOS12 = Subaru FMOS observations in 2012 (Oi et al., 2017PASJ...69...70O 2017PASJ...69...70O)
GTC14A = GTC from Appendix A
GTC14a = GTC from Appendix A
GTC15A = GTC from Appendix A
GTC15B = GTC from Appendix A
GTC17A = GTC from Appendix A
HEC07 = Hectospec
HEC08 = Hectospec
HYD08 = Hydra/WIYN
LBT = LBT from Appendix A,
MMT20 = Hectspec/Multiple Mirror Telescope (Kim et al., 2024, in prep)
NED = from NED
Rumbach17 = R17 (Rumbaugh et al., 2017MNRAS.466..496R 2017MNRAS.466..496R)
Note (3): Spectroscopic redshift if q_zsp is A, AB, B, C, P, or X.
Photometric redshift by Oi et al. (2021MNRAS.500.5024O 2021MNRAS.500.5024O) otherwise.
Note (4): Short comments of optical/IR spectroscopy. Those sources with further
comments in Sect. 4.6 are marked by an asterisk (*). Classifications in the
Baldwin- Phillips-Terlevich (BPT) diagram (Baldwin et al.,
1981PASP...93....5B 1981PASP...93....5B) and mid-infrared (MIR) SED studied by Kim et al. (2023,
American Astronomical Society Meeting Abstracts, Vol. 55, American
Astronomical Society Meeting Abstracts, 144.03D), Kim et al. (in prep) for a
sub-sample are also included. See Sect. 5.2.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- CXOName Name of the X-ray source (ANEPD-CXONNN)
14- 16 A3 --- r_Pos Referece to positions (Ga for Gaia, HSC)
18- 26 F9.5 deg RAdeg Right ascension (J2000) of this ID candidate
28- 35 F8.5 deg DEdeg Declination (J2000) of this ID candidate
37- 40 F4.1 arcsec IDSep ?=-9.9 Separation from X-ray position
42- 48 F7.3 mag gmag ?=-9.99 HSC g magnitude (AB)
50- 55 F6.3 mag e_gmag ?=-9.99 HSC g magnitude error
57- 62 F6.2 mag Ksmag ?=-9.99 WIRCam Ks magnitude (AB)
64- 68 F5.2 mag e_Ksmag ?=-9.99 WIRCam Ks magnitude error
70- 75 F6.2 mag Gmag ?=-9.99 Gaia G magnitude
77- 81 A5 --- GaiaMW [false/true ] MW flag based on Gaia (G1)
83- 94 E12.6 --- LR ?=9.99000e+29 Likelihood ratio (LR)
96 I1 --- Rank LR rank for the X-ray source
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- ObjectID Object name (1)
14- 29 F16.12 deg RAdeg Right ascension (J2000)
31- 45 F15.12 deg DEdeg Declination (J2000)
47- 56 A10 --- Tel/Inst Telescope/Instrument
58- 66 A9 --- MaskID Mask ID
68- 75 F8.6 --- zsp Spectroscopic redshift
77- 78 A2 --- q_zsp Quality Flag to zsp (2)
80- 84 A5 --- Class Object flag from spectroscopy (G2)
86- 93 F8.6 arcsec Sep Separtion between slit and catalog positions
95-193 A99 --- Com Comments/Identfied features in spectrum
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Note (1): Object Identifier adopted from Krumpe et al. (2015MNRAS.446..911K 2015MNRAS.446..911K,
Cat. J/MNRAS/446/911) for Chandra X-ray sources.
For non-X-ray sources, the ID numbers marked by a '+' is from an internal
z'-based catalog Hanami et al. (2012PASJ...64...70H 2012PASJ...64...70H), '*' from Oi et al.
(2014A&A...566A..60O 2014A&A...566A..60O, Cat. J/A+A/566/A50), and no mark from Murata et al.
(2013A&A...559A.132M 2013A&A...559A.132M, Cat. J/A+A/559/A132).
Note (2): Quality Flag of the measured redshift as follows:
A = at least three emission lines were identified (without accounting
absorption lines)
*A = at least three emission lines were identified (without accounting
absorption lines), different observations confirm the measured redshift
B = only one or two emission lines were recognized (again, without
accounting absorption lines)
*B = only one or two emission lines were recognized (again, without accounting
absorption lines), different observations confirm the measured redshift
C = only one emission line and no absorption lines were distinguished
*C = only one emission line and no absorption lines were distinguished,
different observations confirm the measured redshift distinguished
D = redshift estimate is not sufficiently reliable
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Global notes:
Note (G1): true: Significant parallax and/or proper motion (>3σ) in Gaia
DR3 indicating a Galactic object, false: no significant parallax,
proper motion or Gaia source entry.
Note (G2): Souce ID Classification as follows:
STAR = Confirmed Milky Way objects that have parallax and/or proper motion
detection (>3σ) from Gaia data
XAGN1 = Spectroscopically confirmed broadline AGNs that have one or more
permitted emission line(s) with FWHM>1000km/s
XAGN = Extragalactic sources with spectroscopic redshift measurements without
apparent broad line(s) that have either
L0.5-7keV>1042.5h702[erg/s], line ratios in the AGN regime
in the BPT diagnostic diagram (Baldwin et al., 1981PASP...93....5B 1981PASP...93....5B)
and/or high excitation lines indicative of an AGN
XAGN* = Extragalactic sources that meet the X-ray luminosity criterion for
'XAGN' based on the photometric redshifts.
XGAL = Extragalactic sources that do not fall into XAGN1/XAGN category based
on the spectroscopic redshifts
XGAL* = Extragalactic sources that do not fall into the XAGN* based on the
photometric redshifts
GAL = Galaxy
ULX = ULX
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Acknowledgements:
Takamitsu Miyaji, miyaji(at)astro.unam.mx
References:
Krumpe et al., Paper I 2015MNRAS.446..911K 2015MNRAS.446..911K, Cat. J/MNRAS/446/911
(End) Takamitsu Miyaji [IA-UNAM-E, Mexico], Patricia Vannier [CDS] 24-Jul-2024