J/ApJ/896/95 X-ray obs. of narrow- and broad-line Seyfert 1 gal. (Ojha+, 2020)
A comparison of X-ray photon indices among the narrow- and broad-line Seyfert 1
galaxies.
Ojha V., Chand H., Dewangan G.C., Rakshit S.
<Astrophys. J., 896, 95 (2020)>
=2020ApJ...896...95O 2020ApJ...896...95O
ADC_Keywords: Galaxies, Seyfert; X-ray sources; Redshifts; Optical
Keywords: Galaxy physics ; Active galaxies ; Galaxy accretion disks ;
Seyfert galaxies ; X-ray surveys ; Active galactic nuclei
Abstract:
We present a detailed comparative systematic study using a sample of
221 narrow-line Seyfert 1 (NLSy1) galaxies in comparison to a
redshift-matched sample of 154 broad-line Seyfert 1 (BLSy1) galaxies
based on their observations using ROSAT and/or XMM-Newton in soft
X-ray band (0.1-2.0keV). A homogeneous analysis is carried out to
estimate their soft X-ray photon indices (ΓXs) and its
correlations with other parameters of nuclear activities such as
Eddington ratios (REdd), bolometric luminosities (Lbol), black hole
masses (MBH), and the widths of the broad component of Hβ lines
(FWHM(Hβ)). In our analysis, we found clear evidence of the
difference in the ΓXs and REdd distributions among NLSy1
and BLSy1 galaxies, with steeper ΓXs and higher REdd for
the former. Such a difference also exists in the spectral index
distribution in hard X-ray (ΓXh), based on the analysis of
53 NLSy1 and 46 BLSy1 galaxies in the 2-10keV energy band. The
difference in REdd distributions does exist even after applying the
average correction for the difference in the inclination angle of
NLSy1 and BLSy1 galaxies. We also estimated REdd, based on SED
fitting of 34 NLSy1 and 30 BLSy1 galaxies over the 0.3-10keV energy
band, and found that results are still consistent with REdd estimates
based on the optical bolometric luminosity. Our analysis suggests that
the higher REdd in NLSy1 is responsible for its steeper X-ray spectral
slope compared to the BLSy1, consistent with the disk-corona model as
proposed for the luminous AGNs.
Description:
The X-ray data of our narrow-line Seyfert 1 (NLSy1) and broad-line
Seyfert 1 (BLSy1) galaxies were based on observations taken either
with ROSAT/PSPC or with XMM-Newton/EPIC telescopes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 159 224 *Spectral analysis of 221 narrow-line Seyfert 1
(NLSy1) galaxies in X-ray
table4.dat 159 157 *Spectral analysis of 154 broad-line Seyfert 1
(BLSy1) galaxies in X-ray
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Note on table3.dat and table4.dat:
Table 3: The details of our spectral analysis of 221 NLSy1 galaxies
in the soft energy band (0.1-2.0 keV) including the 53 and 139 NLSy1s
analyzed also in the hard (2-10 keV) and total (0.3-10 keV) energy
bands, respectively.
Table 4: The details of our spectral analysis of 154 BLSy1 galaxies
in the soft energy band (0.1-2.0 keV) including the 46 and 97 BLSy1s
analyzed also in the hard (2-10 keV) and total (0.3-10 keV) energy
bands, respectively.
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See also:
B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2012)
VII/243 : SDSS quasar catalog. III. (Schneider+, 2005)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
J/A+A/309/81 : X-ray properties of AGN (Wang+, 1996)
J/A+A/350/805 : X-ray selected ROSAT AGN spectra (Grupe+, 1999)
J/ApJS/166/128 : Narrow line Seyfert 1 galaxies from SDSS-DR3 (Zhou+, 2006)
J/A+A/588/A103 : 2nd ROSAT all-sky survey (2RXS) source catalog (Boller+, 2016)
J/ApJS/229/39 : Narrow line Seyfert 1 galaxies from SDSS-DR12 (Rakshit+, 2017)
J/ApJS/235/40 : Low-mass black holes in Sy1 gal. II. SDSS-DR7 (Liu+, 2018)
Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Seyfert 1 galaxies name (JHHMMSS.ss+DDMMSS.s)
21- 27 F7.3 deg RAdeg Right Ascension, decimal degrees (J2000)
29- 35 F7.3 deg DEdeg Declination, decimal degrees (J2000)
37- 42 F6.4 --- zem [0.023/0.8] Emission redshift based on NED
44- 48 F5.1 --- S/N [7/667] Signal-to-noise ratio (S/N) of source
in total (0.3-10keV) energy band
50- 55 F6.4 [Msun] logMBH [5.2/9.8] logarithmic of black hole mass
57- 63 F7.4 --- logREdd [-3/0.3] logarithmic of Eddington ratio
65- 70 F6.4 --- Gammaxh [1.1/2.7]? 2-10keV photon index (1)
72- 78 F7.4 --- e_Gammaxh [0.03/1.1]? lower error on Gamma-xh
80- 85 F6.4 --- E_Gammaxh [0.03/1.6]? upper error on Gamma-xh
87- 92 F6.4 --- Gammaxs [1/4.5]? 0.1-2.0keV photon index (1)
94-100 F7.4 --- e_Gammaxs [0.03/1.1]? lower error on Gamma-xs
102-107 F6.4 --- E_Gammaxs [0.03/2.1]? upper error on Gamma-xs
109-114 F6.4 --- GammaxT [1.3/4.3]? 0.3-10keV photon index (1)
116-122 F7.4 --- e_GammaxT [0.01/1.2]? lower error on Gamma-xT
124-129 F6.4 --- E_GammaxT [0.01/2.2]? upper error on Gamma-xT
131-135 F5.2 [10-7W] L5100 [41.76/45.18] Optical luminosity of NLSy1
at 5100 Angstrom in erg/s units
137-141 I5 km/s FWHMHb [484/17983] FWHM of broad component of
H-beta line
143-146 I4 km/s e_FWHMHb [12/2692] Error in FWHM-Hb
148-153 F6.2 arcsec Ap [5.9/323] Radius of aperture used in
our reduction
155-159 A5 --- Tel Telescope used ("Rosat" or "XMM")
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Note (1): Null values indicate that the photon index could not be estimated in
the selected energy band.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 28-Oct-2021