J/A+A/519/A17 X-ray/UV ratio of 2XMM AGN (Vagnetti+, 2010)
Variability and the X-ray/UV ratio of active galactic nuclei.
Vagnetti F., Turriziani S., Trevese D., Antonucci M.
<Astron. Astrophys., 519, A17-17 (2010)>
=2010A&A...519A..17V 2010A&A...519A..17V
ADC_Keywords: QSOs ; Active gal. nuclei ; X-ray sources ; Ultraviolet
Keywords: surveys - galaxies: active - quasars: general - X-rays: galaxies
Abstract:
The observed relation between the X-ray radiation from active galactic
nuclei, originating in the corona, and the optical/UV radiation from
the disk is usually described by the anticorrelation between the UV to
X-ray slope αox and the UV luminosity. Many factors can affect
this relation, including: i) enhanced X-ray emission associated with
the jets of radio-loud AGNs, ii) X-ray absorption associated with the
UV broad absorption line (BAL) outflows, iii) other X-ray absorption
not associated with BALs, iv) intrinsic X-ray weakness, v) UV and
X-ray variability, and non-simultaneity of UV and X-ray observations.
The separation of these effects provides information about the
intrinsic αox-LUV relation and its dispersion, constraining
models of disk-corona coupling.
We use simultaneous UV/X-ray observations to remove the influence of
non-simultaneous measurements from the αox-LUV relation.
Description:
We extract simultaneous data from the second XMM-Newton serendipitous
source catalogue (XMMSSC) and the XMM-Newton Optical Monitor
Serendipitous UV Source Survey catalogue (XMMOMSUSS), and derive the
single-epoch αox indices. We use ensemble structure functions
to analyse multi-epoch data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 315 Sources studied in the paper
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See also:
IX/41 : XMM-Newton Serendipitous Source Catalogue 2XMMi-DR3 (XMM-SSC, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/241] Source sequential number
5 I1 --- Nepo ? Epoch serial number
7- 10 A4 --- --- [2XMM]
12- 27 A16 ---- 2XMM 2XMM source name (JHHMMSS.s+DDMMSS)
30- 38 F9.3 d Epoch Epoch of observation (MJD)
40- 44 F5.3 --- z Redshift
46- 47 I2 --- fRL [-1/1] Radio-loud flag (1=radio-loud) (1)
49 I1 --- fBAL [0/1] BAL flag (1=BAL, 2=non-BAL)
51- 55 F5.2 [10-7W/Hz] logLUV UV (2500Å) luminosity
57- 61 F5.2 [10-7W/Hz] logLX X-ray (2keV) luminosity
63- 67 F5.2 --- alp.ox UV to X-ray power law index (3)
69- 73 F5.2 --- Dalp.ox Residual of αox
75- 79 F5.2 --- HR3 Hardness ratio between bands 1-2 and 2-4.5keV
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Note (1): RL flag as follows:
1 = radio-loud
0 = radio-quiet
-1 = radio-unclassified
Note (3): index α where Lν∝να
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Dec-2010