J/A+A/698/A160 NLS1 galaxy 1H 0323+342 Xray, UBV, UV, gamma data (Rosa+, 2025)
Accretion and ejection at work in the Narrow Line Seyfert 1 galaxy 1H 0323+342.
A case of intermittent activity?
Rosa V., Foschini L., Ciroi S.
<Astron. Astrophys. 698, A160 (2025)>
=2025A&A...698A.160R 2025A&A...698A.160R (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, Seyfert ; X-ray sources ;
Gamma rays ; Galaxies, spectra ; Optical
Keywords: radiation mechanisms: non-thermal - techniques: spectroscopic -
surveys - galaxies: jets - galaxies: Seyfert
Abstract:
We present a comprehensive investigation into the properties of
1H 0323+342, a prominent jetted narrow-line Seyfert 1 galaxy.
The primary objective is to understand the interplay between the
relativistic jet, the hot corona, and the accretion disk around the
supermassive black hole.
This study spans the years 2006 to 2023, incorporating a rich dataset
with 172 Swift observations, including the optical, UV, and X-ray
bands, integrated with Fermi Large Area Telescope (LAT) observations.
Spectral analysis was conducted on the X-ray observations using the
XSPEC software, and the results were compared with optical, UV, and
gamma-ray flux measurements and photon index values.
Our key findings include the identification of three distinct zones in
the X-ray photon index-flux plot, characterized by high flux and a
hard photon index (zone 1), high flux and a soft photon index (zone
2), and low flux and a soft photon index (zone 3). Before ∼2017, 1H
0323+342 moved back and forth between zones 1 and 2; after that epoch,
it transitioned to zones 2 and 3. Correspondingly, we observed a
decreasing jet activity in the Fermi/LAT data and a reduction in the
accretion rate in optical/UV data from Swift/UVOT.
We interpret these observations in the framework of an intermittent
jet scenario, driven by radiation-pressure instability in the
accretion disk.
Description:
This data set provides results from the X-ray spectral fits and
optical-ultraviolet data. The data were obtained using Swift XRT and
UVOT telescopes and Fermi LAT Telescope.
Objects:
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RA (2000) DE Designation(s)
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03 24 41.16 +34 10 45.8 1H 0323+342 = 4FGL J0324.8+3412
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
xray.dat 75 183 Results of the X-ray spectral fits
optical.dat 49 110 Optical data
uv.dat 49 110 Ultraviolet data
gamma.dat 34 43 *gamma-ray data from Fermi/LAT
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Note on gamma.dat: We reported only detections with TS≳10.
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Byte-by-byte Description of file: xray.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 d Time Time of the observation (MJD)
11- 13 A3 --- Model Model (pow, power law; bkn, broken power law)
16- 19 F4.2 --- Gamma1 Photon index, for the power-law model, or
photon index of the soft component, for
the broken power-law model
21- 24 F4.2 --- e_Gamma1 Photon index, for the power-law model, or
photon index of the soft component, for
the broken power-law model, error
26- 29 F4.2 10-14W/m2 F1 Integrated 0.3-10keV flux for the power-law
model, or soft-component flux, for the
broken power-law model (10-11erg/cm2/s)
31- 34 F4.2 10-14W/m2 e_F1 Integrated 0.3-10keV flux for the power-law
model, or soft-component flux, for the
broken power-law model (10-11erg/cm2/s),
error
36- 39 F4.2 keV Ebreak ?=- Break energy, for the broken power-law
model
41- 44 F4.2 keV e_Ebreak ? Break energy, for the broken power-law
model, error
46- 49 F4.2 --- Gamma2 ?=- Photon index of the hard component
for the broken power-law model
51- 54 F4.2 --- e_Gamma2 ? Photon index of the hard component
for the broken power-law model error
56- 59 F4.2 10-14W/m2 F2 ?=- Hard-component flux, for the broken
power-law model (10-11erg/cm2/s)
61- 64 F4.2 10-14W/m2 e_F2 ? Hard-component flux, for the broken
power-law model (10-11erg/cm2/s) error
66- 71 F6.2 --- chi2 χ2 value
72 A1 --- --- [/]
73- 75 I3 --- dof Degrees of freedom
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Byte-by-byte Description of file: optical.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 d Time Time of the observation (MJD)
11- 14 F4.2 --- alphaOpt Optical spectral index as
from Eq. (alfao)
16- 19 F4.2 --- e_alphaOpt Optical spectral index as
from Eq. (alfao) error
21- 24 F4.2 10-14W/m2 FV Dereddened flux in the V filter
(10-11erg/cm2/s)
26- 29 F4.2 10-14W/m2 e_FV Dereddened flux in the V filter
(10-11erg/cm2/s) error
31- 34 F4.2 10-14W/m2 FB Dereddened flux in the B filter
(10-11erg/cm2/s)
36- 39 F4.2 10-14W/m2 e_FB Dereddened flux in the B filter
(10-11erg/cm2/s) error
41- 44 F4.2 10-14W/m2 FU Dereddened flux in the U filter
(10-11erg/cm2/s)
46- 49 F4.2 10-14W/m2 e_FU Dereddened flux in the U filter
(10-11erg/cm2/s) error
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Byte-by-byte Description of file: uv.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 d Time Time of the observation (MJD)
10- 14 F5.2 --- alphaUV Ultraviolet spectral index as
from Eq. (alfao)
16- 19 F4.2 --- e_alphaUV Ultraviolet spectral index as
from Eq. (alfao) error
21- 24 F4.2 10-14W/m2 FUVW1 Dereddened flux in the UVW1 filter
(10-11erg/cm2/s)
26- 29 F4.2 10-14W/m2 e_FUVW1 Dereddened flux in the UVW1 filter
(10-11erg/cm2/s) error
31- 34 F4.2 10-14W/m2 FUVM2 Dereddened flux in the UVM2 filter
(10-11erg/cm2/s)
36- 39 F4.2 10-14W/m2 e_FUVM2 Dereddened flux in the UVM2 filter
(10-11erg/cm2/s) error
41- 44 F4.2 10-14W/m2 FUVW2 Dereddened flux in the UVW2 filter
(10-11erg/cm2/s)
46- 49 F4.2 10-14W/m2 e_FUVW2 Dereddened flux in the UVW2 filter
(10-11erg/cm2/s) error
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Byte-by-byte Description of file: gamma.dat
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Bytes Format Units Label Explanations
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1- 5 I5 d Time Time of the detection (MJD)
7- 11 F5.2 --- Gamma Gamma-ray photon index
13- 16 F4.2 --- e_Gamma Gamma-ray photon index error
18- 22 F5.2 10-14W/m2 Flux Flux in the 0.1-100GeV energy band
(10-11ergs/cm2/s)
24- 27 F4.2 10-14W/m2 e_Flux Flux in the 0.1-100GeV energy band
(10-11ergs/cm2/s) error
29- 34 F6.2 --- TS Test Statistic MATTOX1996
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Acknowledgements:
Valentina Rosa, valentinarosa99(at)gmail.com
(End) Patricia Vannier [CDS] 31-Mar-2025