2008A&A...490..995P


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.26CET00:49:51

2008A&A...490..995P - Astronomy and Astrophysics, volume 490, 995-1003 (2008/11-2)

The X-ray variability and the near-IR to X-ray spectral energy distribution of four low luminosity Seyfert 1 galaxies.

PAPADAKIS I.E., IOANNOU Z., BRINKMANN W. and XILOURIS E.M.

Abstract (from CDS):

We present the results from a study of the X-ray variability and the near-IR to X-ray spectral energy distribution of four low-luminosity, Seyfert 1 galaxies. We compared their variability amplitude and broad band spectrum with those of more luminous AGN in order to investigate whether accretion in low-luminosity AGN operates as in their luminous counterparts. We used archival XMM-Newton and, in two cases, ASCA data to estimate their X-ray variability amplitude and determine their X-ray spectral shape and luminosity. We also used archival HST data to measure their optical nuclear luminosity, and near-IR measurements from the literature, in order to construct their near-IR to X-ray spectra. The X-ray variability amplitude of the four Seyferts is what one would expect, given their black hole masses. Their near-IR to X-ray spectrum has the same shape as the spectrum of quasars that are 102-105 times more luminous. The objects in our sample are optically classified as Seyfert 1-1.5. This implies that they host a relatively unobscured AGN-like nucleus. They are also of low luminosity and accrete at a low rate. They are therefore good candidates to detect radiation from an inefficient accretion process. However, our results suggest that they are similar to AGN that are 102-105 times more luminous. The combination of a ``radiative efficient accretion disc plus an X-ray producing hot corona'' may persist at low accretion rates as well.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - X-rays: galaxies

CDS comments: Paragraph. 2.2 NGC 5503 and NGC 5053 are probable misprints for NGC 5033.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4030 5
2 NGC 3998 SyG 11 57 56.1333561013 +55 27 12.925850484   11.64 12.10 10.09   ~ 586 2
3 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 2023 1
4 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3423 2
5 NGC 4235 Sy1 12 17 09.8844228368 +07 11 29.665090752   14.70 13.60     ~ 371 0
6 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 886 0
7 M 58 SyG 12 37 43.597 +11 49 05.12 10.80 10.48 9.66     ~ 984 2
8 NGC 4639 GiP 12 42 52.3781396179 +13 15 26.712929286   13.62 12.72     ~ 564 0
9 NGC 5033 Sy1 13 13 27.535 +36 35 37.14   11.01 12.03 9.73   ~ 808 3
10 NGC 5273 Sy1 13 42 08.386 +35 39 15.26   14.01 13.12     ~ 411 0
11 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2434 0

    Equat.    Gal    SGal    Ecl

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2021.01.26-00:49:51

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