J/A+A/368/797 Soft X-ray properties of Seyfert galaxies (Pfefferkorn+, 2001)
Soft X-ray properties of a spectroscopically selected sample of interacting and
isolated Seyfert galaxies.
Pfefferkorn F., Boller T., Rafanelli P.
<Astron. Astrophys. 368, 797 (2001)>
=2001A&A...368..797P 2001A&A...368..797P
ADC_Keywords: Galaxies, Seyfert ; X-ray sources
Keywords: catalogs - galaxies: active - galaxies: interactions -
galaxies: Seyfert - X-rays: galaxies
Abstract:
We present a catalogue of ROSAT detected sources in the sample of
spectroscopically selected Seyfert 1 and Seyfert 2 galaxies of
Rafanelli et al. (1995AJ....109.1546R 1995AJ....109.1546R). The catalogue contains 102
Seyfert 1 and 36 Seyfert 2 galaxies. The identification is based on
X-ray contour maps overlaid on optical images taken from the Digitized
Sky Survey. We have derived the basic spectral and timing properties
of the X-ray detected Seyfert galaxies. For Seyfert 1 galaxies a
strong correlation between photon index and X-ray luminosity is
detected. We confirm the presence of generally steeper X-ray continua
in narrow-line Seyfert 1 galaxies (NLS1s) compared to broad-line
Seyfert 1 galaxies. Seyfert 2 galaxies show photon indices similar to
those of NLS1s. Whereas a tendency for an increasing X-ray luminosity
with increasing interaction strength is found for Seyfert 1 galaxies,
such a correlation is not found for Seyfert 2 galaxies. For Seyfert 1
galaxies we found also a strong correlation for increasing
far-infrared luminosity with increasing interaction strength. Both
NLS1s and Seyfert 2 galaxies show the highest values of far-infrared
luminosity compared to Seyfert 1 galaxies, suggesting that NLS1s and
Seyfert 2 galaxies host strong (circumnuclear) star formation. For
variable Seyfert galaxies we present the X-ray light curves obtained
from the ROSAT All-Sky Survey and from ROSAT PSPC and HRI pointed
observations. Besides the expected strong short- and long-term X-ray
variability in Seyfert 1 galaxies, we find indications for X-ray flux
variations in Seyfert 2 galaxies.
Description:
We have detected 91 out of 99 Seyfert 1 and 47 out of 98 Seyfert 2
galaxies of the Rafanelli sample in the ROSAT X-ray band in pointed
and/or All-Sky Survey observations. Spectral information from the
survey data could be obtained for 59 Seyfert 1 galaxies and only for
one Seyfert 2 galaxy.
The tables quote the name of the Seyfert galaxy in column 1 and the
ROSAT name in column 2. Columns 3 and 4 contain the ROSAT position. We
mostly give the centroid source position from the pointed observation
with the higher exposure times. The columns 5 and 6 list the count
rates, columns 7 and 8 the corresponding exposure times, columns 9 and
10 the fluxes and columns 11 and 12 the luminosities of the sources
detected in ROSAT pointing and survey observations, respectively. The
survey count rates were taken from the RASS II catalogue and the
pointing count rates were computed from the light curves of the
sources. The labels "(p)" and "(h)" in column 5 indicate that the
source data are taken from a PSPC or HRI observation. In the columns 9
and 10 we apply the labels "(f)" and "(c)" to mark the data produced
by spectral fit or by count rates. This specification applies also for
columns 11 and 12. The Galactic column density is given in column 13
(Dickey & Lockman, 1990ARA&A..28..215D 1990ARA&A..28..215D), while the column density
obtained from the spectral fit is given in column 14. The other
spectral fit parameters, namely the monochromatic flux at 1keV and the
photon index are also given in columns 15 and 16, respectively. The
value "-2.3" of the photon index was used, if no reliable spectral fit
could be obtained. When spectral information was available from the
survey as well as from the pointed data, we quote the results from the
pointed observations. Columns 17 and 18 show the quality of the X-ray
identifications both in the pointing and the survey observations, the
identifications labeled either with 1 or 2, 1 and 2 indicating high
and lower degree of reliability, respectively. In the last column we
have listed the classification of the Seyfert type (Sy1.0, Sy1.2,
Sy1.5, Sy1.8, Sy1.9, Sy2.0) taken from the "Catalogue of Seyfert
Galaxies" (Lipovetski et al., 1987, Cat. VII/173). We have modified
the Rafanelli et al. conventions (S1 = Sy1.0 + Sy1.2 + Sy1.5 and S2 =
Sy1.8 + Sy1.9 + Sy2.0) to S1 = Sy1.0 + Sy1.2 + Sy1.5 + Sy1.8 + Sy1.9
and S2 = S2.0. The classifications marked by a (N) indicate
Narrow Line Seyfert 1 galaxies (NLS1) (e.g. Osterbrock & Pogge,
1985ApJ...297..166O 1985ApJ...297..166O; Boller, Brandt & Fink 1996A&A...305...53B 1996A&A...305...53B; Grupe
1996, Properties of bright soft X-ray selected ROSAT AGN, Dissertation
submitted Georg-August University, Gvttingen, Germany ).
For each source of the Rafanelli sample we have searched for X-ray
detections within the ROSAT All-Sky Survey (RASS II catalogue; see
Voges, Aschenbach, Boller et al., 1999, Cat. IX/10 for references)
and public PSPC (Position Sensitive Proportional Counter) and HRI
(High Resolution Imager) pointed observations. The sources have been
identified on X-ray contour maps overlaid to optical images taken from
the Palomar Digitized Sky Survey (DSS). We have generated background
subtracted contour maps for each selected ROSAT observation. Overlays
with a dark background indicate pointed observations (HRI for
HRI-data, without label for PSPC-data), whereas the grey background
indicate ROSAT All-Sky survey data (PSPC).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
seyfert1.dat 225 102 Table C.3 (of the paper) contains soft X-ray
properties of the interacting or isolated
Seyfert1 galaxies
seyfert2.dat 225 36 Table C.4 (of the paper) contains soft X-ray
properties of the interacting or isolated
Seyfert2 galaxies
figs1/* . 102 Seyfert1 images
figs2/* . 36 Seyfert2 images
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
IX/28 : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000)
IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)
IX/31 : The WGACAT version of ROSAT sources (White+ 2000)
Byte-by-byte Description of file: seyfert1.dat seyfert2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Galaxy name
15- 35 A21 --- ROSAT ROSAT name of the galaxy
38- 39 I2 h RAh Right ascension (J2000) (1)
41- 42 I2 min RAm Right ascension (J2000) (1)
44- 47 F4.1 s RAs Right ascension (J2000) (1)
49 A1 --- DE- Declination sign
50- 51 I2 deg DEd Declination (J2000) (1)
53- 54 I2 arcmin DEm Declination (J2000) (1)
56- 57 I2 arcsec DEs Declination (J2000) (1)
60- 64 F5.3 ct/s Pcount ? Source count rate, pointing obs.
66- 70 F5.3 ct/s e_Pcount ? rms uncertainty on Pcount
71- 73 A3 --- Dtype [(ph)] ROSAT detector type: (2)
75- 79 F5.3 ct/s Scount ? Source count rate, survey obs. (3)
81- 85 F5.3 ct/s e_Scount ? rms uncertainty on Scount
88- 92 I5 s PExpTime ? Exposure time of pointing obs.
94- 97 I4 s SExpTime ? Exposure time of survey observations
100-105 F6.2 [mW/m+2] logPFlux ? decimal log. of X-ray Flux (pointing)
106-108 A3 --- f_logPFlux [(fc)] Pointing flux obtained from
f - spectral fit or c - count rate
111-116 F6.2 [mW/m+2] logSFlux ? decimal log. of X-ray Flux (survey)
117-119 A3 --- f_logSFlux [(fc)] Survey flux obtained from
f - spectral fit or c - count rate
122-126 F5.2 [10-7W] logPLumn ? decimal log. of X-ray luminosity
(pointing observation)
129-133 F5.2 [10-7W] logSLumn ? decimal log. X-ray luminosity
(survey observation)
136-140 F5.3 10+21/cm+2 gNH ? Galactic hydrogen column density
142 A1 --- n_fNH [=] "=" fixed value for fNH < gNH or
no spectral Γ
143 A1 --- l_fNH Limit flag on fNH
144-148 F5.3 10+21/cm+2 fNH ? Spectral (fit) hydrogen column
density (4)
150-154 F5.3 10+21/cm+2 e_fNH ? rms uncertainty on fNH
156-162 F7.2 10-5/cm2/keV F1keV ? monochromatic flux at energy = 1keV
164-169 F6.2 10-5/cm2/keV e_F1keV ? Error of monochromatic flux at 1keV
172 A1 --- n_Gamma "=" for fixed value of photon index (5)
173-177 F5.2 --- Gamma ? Spectral (or defined: -2.3) photon index
179-182 F4.2 --- e_Gamma ? Error of spectral photon index
186 I1 --- Pqual [1/2]? Quality of X-ray identification
1: high, 2: lower degree of reliability
190 I1 --- Squal [1/2]? Quality of X-ray identification
1: high, 2: lower degree of reliability
194-196 F3.1 --- Stype [1/3]? Seyfert type
197-199 A3 --- NLS1 [(N) ] N: classified as Narrow Line
Seyfert 1 galaxy (NLS1)
201-225 A25 --- FileName Associated image name stored here
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Note (1): pointed observation values are preferred
Note (2): p - PSPC ; h - HRI
Note, that PSPC (Position Sensitive Proportional Counter)
and HRI (High Resolution Imager) count rates are not comparable.
Note (3): obtained from the ROSAT RASS II catalogue
Note (4): In the case of fNH < gNH, we have used the galactic absorption column
density gNH (Dickey & Lockman, 1990ARA&A..28..215D 1990ARA&A..28..215D).
Note (5): The value "-2.3" of the photon index was used, if no reliable spectral
fit could be obtained
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Acknowledgements: Frank Pfefferkorn
(End) Patricia Bauer [CDS] 12-Apr-2001