2000A&A...354..411K


Query : 2000A&A...354..411K

2000A&A...354..411K - Astronomy and Astrophysics, volume 354, 411-422 (2000/2-2)

X-ray emission/absorption mechanisms of 4 NLSy-1-like AGN and a radio quasar QSO 0117-2837, RX J0134.3-4258, NGC 4051, Mrk 1298, 4C +74.26.

KOMOSSA S. and MEERSCHWEINCHEN J.

Abstract (from CDS):

We present a study of the X-ray variability properties and spectral shapes of five active galaxies all of which show extreme or enigmatic X-ray properties. We focus on, 134, and NGC 4051, and briefly comment on Mrk 1298 and c. The individual objects were originally partly selected as candidates to host warm absorbers on the basis of (i) characteristic X-ray absorption features (NGC 4051, Mrk 1298, c), (ii) extreme X-ray spectral steepness ( ; this object is found to be located in the `zone of avoidance' when plotted in the Γx-FWHM diagram), and (iii) drastic spectral variability (134). The temporal analysis reveals large-amplitude variability by a factor ∼30 in the long-term X-ray lightcurve of NGC 4051, very rapid variability of Mrk 1298, constant X-ray flux of the NLSy1 galaxy, and constant mean countrate of 134 despite huge spectral changes. Besides the warm absorber, several further mechanisms and their merits/shortcomings are investigated to explain the spectral characteristics of the individual objects. Different models are favored for different sources. Consequences for Narrow-line Seyfert 1s in general are discussed and we present results from photoionization models to distinguish between different suggested NLSy1 scenarios.

Abstract Copyright:

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

CDS comments: p. 417 : IRAS 13224 = IRAS 13224-3809 ?

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Mrk 1502 Sy1 00 53 34.9331107632 +12 41 35.929269132   14.41 14.03     ~ 1092 1
2 Ton S 180 Sy1 00 57 20.2040816832 -22 22 56.575212564   14.60 14.34 15.23   ~ 283 0
3 2MASS J01193569-2821314 Sy1 01 19 35.6924750256 -28 21 31.423369428   18.13 16.3 16.58   ~ 50 0
4 2MASS J01341690-4258262 Sy1 01 34 16.9072341600 -42 58 26.223391344   18.17 17.30 16.71   ~ 69 0
5 2MASS J01395577+0619225 Sy1 01 39 55.7697705024 +06 19 22.520805888   16.80 17.00     ~ 163 0
6 LB 1727 Sy1 04 26 00.7188165240 -57 12 01.769902992 13.68 14.58 14.37 14.8   ~ 251 0
7 NGC 3227 GiP 10 23 30.5765149296 +19 51 54.282206700   12.61 11.79     ~ 1614 1
8 Mrk 1298 Sy1 11 29 16.7288400936 -04 24 07.246460520   14.97 14.61     ~ 188 1
9 APG 294 GrG 11 39.7 +31 55           ~ 260 0
10 NGC 3786 GiP 11 39 42.5121341928 +31 54 33.971791752   14.62 13.74     ~ 376 1
11 NGC 4051 Sy1 12 03 09.6101337312 +44 31 52.682601288   11.08 12.92 9.94   ~ 2078 1
12 NGC 4253 Sy1 12 18 26.5163572920 +29 48 46.531535472   14.34 13.57     ~ 984 1
13 IC 4271 Sy2 13 29 21.4493074392 +37 24 50.460172056   15.6       ~ 123 1
14 LEDA 101275 Sy1 13 37 18.7199358192 +24 23 03.319883484     15.0     ~ 373 0
15 2MASX J16175244+0604180 Sy1 16 17 52.4301748560 +06 04 18.209230284   15.66 15.7     ~ 60 0
16 6C 170204+454510 Sy1 17 03 30.3824218008 +45 40 47.166180564   16.0       ~ 138 2
17 4C 74.26 Sy1 20 42 37.3079247456 +75 08 02.445851940     14.46 13.80   ~ 228 0
18 NAME MR 2251-178 Sy1 22 54 05.8858611984 -17 34 55.402233708   14.99 14.36 15.12   ~ 401 3

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2022.05.21-08:17:12

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