J/A+A/563/A57 Long-term variability of AGN at hard X-rays (Soldi+, 2014)
Long-term variability of AGN at hard X-rays.
Soldi S., Beckmann V., Baumgartner W.H., Ponti G., Shrader C.R.,
Lubinski P., Krimm H.A., Mattana F., Tueller J.
<Astron. Astrophys. 563, A57 (2014)>
=2014A&A...563A..57S 2014A&A...563A..57S
ADC_Keywords: Active gal. nuclei ; Galaxies, Seyfert ; X-ray sources
Keywords: galaxies: active - galaxies: Seyfert - X-rays: galaxies - surveys
Abstract:
Variability at all observed wavelengths is a distinctive property of
active galactic nuclei (AGN). Hard X-rays provide us with a view of
the innermost regions of AGN, mostly unbiased by absorption along the
line of sight. Characterizing the intrinsic hard X-ray variability of
a large AGN sample and comparing it to the results obtained at lower
X-ray energies can significantly contribute to our understanding of
the mechanisms underlying the high-energy radiation.
Swift/BAT provides us with the unique opportunity to follow, on time
scales of days to years and with regular sampling, the 14-195keV
emission of the largest AGN sample available up to date for this kind
of investigation. As a continuation of an early work using the first 9
months of BAT data, we study the amplitude of the variations and their
dependence on subclass and on energy, for a sample of 110 radio quiet
and radio loud AGN selected from the BAT 58-month survey.
Description:
The sample of 110 hard X-ray detected AGN has been selected from the
58-month SWIFT/BAT survey in order to measure their variability in the
14-195 keV range on time scales from one month up to more than 5
years. The variability estimator has been computed following the
Almaini et al. (2000MNRAS.315..325A 2000MNRAS.315..325A) prescription. Black hole masses
and bolometric luminosities for the objects in the sample have been
collected from the literature.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 89 110 Hard X-ray variability of SWIFT/BAT AGN
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See also:
J/A+A/473/105 : Lockman Hole AGN variability with XMM (Mateos+, 2007)
J/A+A/487/475 : X-ray variability of AGNs in Lockman Hole (Papadakis+, 2008)
J/A+A/488/73 : Variability-selected AGN in Chandra DFS (Trevese+, 2008)
J/A+A/497/81 : Variability-selected AGN in CDFS (Boutsia+, 2009)
J/A+A/536/A84 : X-ray variability of AGN (Vagnetti+, 2011)
J/AJ/142/108 : Radio variability of compact, flat-spectrum AGNs (Koay+, 2011)
J/ApJ/723/737 : Catalog of variability selected AGNs in GOODS (Villforth+ 2010)
J/ApJ/731/97 : Variable AGNs in GOODS fields (Sarajedini+, 2011)
J/ApJ/748/124 : AGN X-ray variability in the 4Ms catalog (Young+, 2012)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Source name
25- 30 A6 --- Type Source classification (4)
32- 36 F5.2 10-4ct/s CRate 14-195keV average count rate (1)
38- 39 I2 % Sv [5/99] Variability estimator of 14-195keV flux
41- 42 I2 % E_Sv [1/19] Upper error on 14-195keV variability
44- 45 I2 % e_Sv [1/19] Lower error on 14-195keV variability
47- 49 I3 % Sv1 [3/104]? variability estimator 14-24keV flux
51- 52 I2 % E_Sv1 [2/27]? Upper error on 14-24keV variability
54- 55 I2 % e_Sv1 [2/36]? Lower error on 14-24keV variability
57- 59 I3 % Sv2 [1/127]? variability estimator 35-100keV flux
61- 62 I2 % E_Sv2 [1/47]? Upper error on 35-100keV variability
64- 65 I2 % e_Sv2 [1/52]? Lower error on 35-100keV variability
67- 70 F4.2 [Msun] logMbh [5.5/9.9]? log of the black hole mass (2)
72- 75 F4.2 [Msun] E_logMbh [0.8]? Upper error on logMbh
77- 80 F4.2 [Msun] e_logMbh [0.8]? Lower error on logMbh
82 A1 --- r_logMbh ? Reference for the black hole mass (3)
84- 87 F4.1 [10-7W] logLbol [42/48]? log of bolometric luminosity (erg/s)
89 A1 --- r_logLbol Reference for the bolometric luminosity (3)
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Note (1): SWIFT/BAT count rate is in units of 10-4 counts per second per
detector.
Note (2): For MR 2251-178 only an upper limit is available for the black hole
mass, therefore no error is assigned to this value.
Note (3): References as follows:
a = Winter et al. (2009ApJ...690.1322W 2009ApJ...690.1322W)
b = Beckmann et al. (2009A&A...505..417B 2009A&A...505..417B)
c = Grier et al. (2012ApJ...755...60G 2012ApJ...755...60G)
d = Vasudevan et al. (2009MNRAS.399.1553V 2009MNRAS.399.1553V)
e = Stalin et al. (2011MNRAS.416..225S 2011MNRAS.416..225S)
f = Woo & Urry (2002ApJ...579..530W 2002ApJ...579..530W)
g = Bian & Gu (2007ApJ...657..159B 2007ApJ...657..159B)
h = Kaspi et al. (2007ApJ...659..997K 2007ApJ...659..997K)
i = Denney et al. (2010ApJ...721..715D 2010ApJ...721..715D)
j = Vasudevan et al. (2010MNRAS.402.1081V 2010MNRAS.402.1081V)
k = Nikolajuk et al. (2004MNRAS.350L..26N 2004MNRAS.350L..26N)
l = Greenhill et al. (2003ApJ...590..162G 2003ApJ...590..162G)
m = Padovani & Rafanelli (1988A&A...205...53P 1988A&A...205...53P)
n = Malizia et al. (2008MNRAS.389.1360M 2008MNRAS.389.1360M)
o = Vasudevan & Fabian (2007MNRAS.381.1235V 2007MNRAS.381.1235V)
Note (4): Classes are:
RG = radio galaxy
BLRG = broad-line radio galaxy
FSRQ = flat spectrum radio quasar
NLRG = narrow-line radio galaxy
NLS1 = narrow-line Seyfert-1 galaxy, a class which shows peculiar
characteristics in the soft X-ray domain, like a steep spectral
continuum, and strong and fast variability.
Sey = Seyfert galaxies (of types 1, 1.2, 1.5, 1.8, 1.8 or 2)
BLLac = BL Lac-type galaxy
blazar = blazing quasi-stellar radio source
quasar = QSO
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Acknowledgements:
Simona Soldi, soldi(at)apc.univ-paris7.fr
(End) Simona Soldi [APC, Paris], Patricia Vannier [CDS] 21-Nov-2013