J/A+A/689/A337 Nuclear properties of highly accreting AGNs (Laurenti+, 2024)
Investigating the nuclear properties of highly accreting active galactic nuclei
with XMM-Newton.
Laurenti M., Tombesi F., Vagnetti F., Piconcelli E., Guainazzi M.,
Vignali C., Paolillo M., Middei R., Bongiorno A., Zappacosta L.
<Astron. Astrophys. 689, A337 (2024)>
=2024A&A...689A.337L 2024A&A...689A.337L (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; X-ray sources; Gamma rays
Keywords: galaxies: active - quasars: general -
quasars: supermassive black holes
Abstract:
Our understanding of highly accreting AGNs is hampered by the lack of
a complete systematic investigation in terms of their main spectral
and variability properties, and by the relative paucity of them in the
local Universe, especially those powered by supermassive black holes
with MBH>108M☉. To overcome this limitation, we present here
the X-ray spectral analysis of a new, large sample of 61 highly
accreting AGNs named as the XMM-Newton High-Eddington Serendipitous
AGN Sample, or X-HESS, obtained by cross-correlating the 11th release
of the XMM-Newton serendipitous catalogue and the catalogue of
spectral properties of quasars from the SDSS DR14. The X-HESS AGNs are
spread across wide intervals with a redshift of 0.06<z<3.3, a black
hole mass of 6.8<log(MBH/M☉)<9.8, a bolometric luminosity of
44.7<logLbol[erg/s]<48.3, and an Eddington ratio of
-0.2<logλEdd<0.5, and more than one third of these AGNs can
rely on multiple observations at different epochs, allowing us to
investigate also their variability. We find a large scatter in the
GAMMA-λEdd distribution of the highly accreting X-HESS AGNs.
A significant correlation is only found by considering a sample of
lower-λEdd AGNs with λEdd≤0.3. The
GAMMA-λEdd relation appears to be more statistically sound
for AGNs with lower MBH and/or Lbol. We investigate the
possibility of transforming the GAMMA-λEdd plane into a fully
epoch-dependent frame by calculating the Eddington ratio from the
simultaneous optical/UV data from the optical monitor,
λEdd,O/UV. Finally, we also get a mild indication of a
possible anti-correlation between Gamma and the strength of the soft
excess.
Description:
We present here the XMM-Newton High-Eddington Serendipitous AGN
Sample, or X-HESS. The main properties of the X-HESS AGNs, the
complete list of the observations used in our study, and the best-fit
results from the spectroscopic analysis are listed in the Tables
A1-C1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 69 61 X-HESS AGNs and their general properties
tableb1.dat 65 142 Journal of observations
tablec1.dat 255 142 Best fitting spectral parameters and
derived quantities
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See also:
B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2012-)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- ID Source identifier in the X-HESS sample
4- 22 A19 --- SDSS SDSS source name (JHHMMSS.ss+DDMMSS.s)
24- 29 F6.2 deg RAdeg Right ascension (J2000)
31- 35 F5.2 deg DEdeg Declination (J2000)
37- 40 F4.2 10+24m-2 NHgal Galactic column density
42- 46 A5 --- E(B-V)int Internal reddening
48- 53 F6.4 --- z Redshift
55- 57 F3.1 [Msun] logMBH Black hole mass
59- 62 F4.1 [10-7W] logLbol Bolometric luminosity
64- 66 F3.1 --- lambdaEdd Eddington ratio
68- 69 I2 --- Nepoch Number of available epochs
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- ID Source identifier in the X-HESS sample
4- 5 I2 --- ObsNo Observation number
7- 16 I10 --- ObsID XMM-Newton observation ID
18- 27 A10 "date" StartDate Start date of the observation (yyyy-mm-dd)
29- 34 F6.2 ks Exppn ?=- Net exposure for the EPIC pn camera
35 A1 --- --- [/]
36- 40 F5.1 ks ExpMOS1 ?=- Net exposure for the EPIC MOS1 camera
41 A1 --- --- [/]
42- 46 F5.1 ks ExpMOS2 ?=- Net exposure for the EPIC MOS2 camera
48- 53 I6 ct Ctstotpn ?=- Net counts for the EPIC pn camera in
the E=0.3-10keV band
54 A1 --- --- [/]
55- 59 I5 ct CtstotMOS1 ?=- Net counts for the EPIC MOS1 camera in
the E=0.3-10keV band
60 A1 --- --- [/]
61- 65 I5 ct CtstotMOS2 ?=- Net counts for the EPIC MOS2 camera in
the E=0.3-10keV band
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Byte-by-byte Description of file: tablec1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- ID Source identifier in the X-HESS sample
4- 5 I2 --- ObsNo Observation number
7- 42 A36 --- Model Best-fit model
44- 47 F4.2 --- W/dof Ratio between W-stat and the degrees of
freedom (dof)
50- 52 I3 --- dof Degrees of freedom
55- 58 F4.2 --- Gamma Photon index
60- 63 F4.2 --- e_Gamma Negative error on photon index
65- 68 F4.2 --- E_Gamma Positive error on photon index
70- 74 F5.1 [eV] kT ?=- Blackbody temperature
76- 80 F5.1 [eV] e_kT ?=- Negative error on kT
82- 85 F4.1 [eV] E_kT ?=- Positive error on kT
87- 92 F6.2 [10-17W/m2] Fsoft Absorbed flux in the soft
E=0.5-2keV band
94- 97 F4.2 [10-17W/m2] e_Fsoft Negative error on Fsoft
99-102 F4.2 [10-17W/m2] E_Fsoft Positive error on Fsoft
104-109 F6.2 [10-17W/m2] Fhard Absorbed flux in the hard
E=2-10keV band
111-114 F4.2 [10-17W/m2] e_Fhard Negative error on Fhard
116-120 F5.2 [10-17W/m2] E_Fhard Positive error on Fhard
122-126 F5.2 [10-7W] logLsoft Intrinsic luminosity in the soft
E=0.5-2keV band
128-131 F4.2 [10-7W] e_logLsoft Negative error on logLsoft
133-136 F4.2 [10-7W] E_logLsoft Positive error on logLsoft
138-142 F5.2 [10-7W] logLhard Intrinsic luminosity in the hard
E=2-10keV band
144-147 F4.2 [10-7W] e_logLhard Negative error on logLhard
149-152 F4.2 [10-7W] E_logLhard Positive error on logLhard
154-159 F6.1 --- kX X-ray bolometric correction
161-165 F5.1 --- e_kX Negative error on kX
167-171 F5.1 --- E_kX Positive error on kX
173-177 F5.2 [10-7W/Hz] logLX Monochromatic luminosity at E=2keV
rest-frame
179-182 F4.2 [10-7W/Hz] e_logLX Negative error on logLX
184-187 F4.2 [10-7W/Hz] E_logLX Positive error on logLX
189-193 F5.2 [10-7W/Hz] logLUV ?=- Monochromatic luminosity at
λ=2500Å rest-frame
195-198 F4.2 [10-7W/Hz] e_logLUV ?=- Negative error on logLUV
200-203 F4.2 [10-7W/Hz] E_logLUV ?=- Positive error on logLUV
205-209 F5.2 [10-7W/Hz] logLO ?=- Monochromatic luminosity at
λ=4400Å rest-frame
211-214 F4.2 [10-7W/Hz] e_logLO ?=- Negative error on logLO
216-219 F4.2 [10-7W/Hz] E_logLO ?=- Positive error on logLO
221-225 F5.2 --- aox ?=- alphaox spectral index
227-230 F4.2 --- e_aox ?=- Negative error on alphaox
232-235 F4.2 --- E_aox ?=- Positive error on alphaox
237-240 F4.1 --- logLEddOUV ?=- Eddington ratio from the
simultaneous optical/UV data
242-245 F4.2 --- Rsp ?=- Proxy of the relative strength of
the soft excess
247-250 F4.2 --- e_Rsp ?=- Negative error on Rsp
252-255 F4.2 --- E_Rsp ?=- Positive error on Rsp
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Acknowledgements:
Marco Laurenti, marco.laurenti(at)roma2.infn.it
(End) Patricia Vannier [CDS] 22-Jul-2024