# 1997A&AS..126..525P

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 Query : 1997A&AS..126..525P

1997A&AS..126..525P - Astron. Astrophys., Suppl. Ser., 126, 525-535 (1997/December-2)

Soft excesses of hard X-ray selected Seyfert 1 galaxies studied with the ROSAT-PSPC.

PIRO L., MATT G. and RICCI R.

Abstract (from CDS):

The nature of the soft X-ray excess in Seyfert 1 galaxies is still an open issue. In order to derive some general properties we analysed the ROSAT PSPC archive observations of the Seyfert galaxies in the Nandra & Pounds (1994MNRAS.268..405N) Ginga sample. The use of this sample ensures a reliable estimate (under the assumption of lack of intrinsic spectral variability) of the slope of the underlying power law, which instead cannot be well measured using ROSAT data alone. We tested three different models for the soft excess: emission from accretion disk (described by a black body), absorption from ionized gas (warm absorber'', described by an absorption edge), and reflection from mildly ionized material (described by a step function). The main result is that no model gives a satisfactory fit for all sources. Furthermore for two sources none of these models provides an acceptable fit. In these cases a physically meaningful combination of two components (e.g. warm absorber plus black body) gives a good fit. We conclude that several different effects concur to the soft excess phenomenon in Seyfert galaxies.

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

Full paper

 Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Mrk 335 Sy1 00 06 19.5372339024 +20 12 10.617404076   14.19 13.85     ~ 1210 0
2 ESO 113-45 Sy1 01 23 45.7631533440 -58 48 20.808928944   14.08 13.83 13.34   ~ 840 0
3 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 914 1
4 Mrk 1095 Sy1 05 16 11.4092471904 -00 08 59.157166920   14.30 13.92     ~ 856 1
5 NGC 3516 Sy1 11 06 47.4632200800 +72 34 07.298374656   13.12 12.40     ~ 1502 0
6 NGC 3783 Sy1 11 39 01.7096819040 -37 44 19.009642992   12.46 13.43 11.33 12.1 ~ 1596 0
7 NGC 4051 Sy1 12 03 09.6101337312 +44 31 52.682601288   11.08 12.92 9.94   ~ 2124 1
8 NGC 4593 Sy1 12 39 39.4435107024 -05 20 39.034988448   13.95 13.15     ~ 1047 0
9 IC 4271 Sy2 13 29 21.4493074392 +37 24 50.460172056   15.6       ~ 124 1
10 ESO 445-50 Sy1 13 49 19.2601801224 -30 18 34.213815504   13.81 13.66 12.18 12.35 ~ 775 0
11 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2602 0
12 Mrk 841 Sy1 15 04 01.1935384104 +10 26 15.780409692   14.50 14.27     ~ 624 0
13 ICRF J184208.9+794617 Sy1 18 42 08.9904975672 +79 46 17.127835104   16.06 15.38     ~ 1281 0
14 Mrk 509 Sy1 20 44 09.7504483224 -10 43 24.727155528   13.35 13.12 10.7   ~ 1232 0
15 NGC 7213 Sy1 22 09 16.2100443720 -47 10 00.115999716   10.97 12.08 10.50 10.6 ~ 635 0
16 NGC 7387 GiG 22 50 17.6522728176 +11 38 12.227830836   15.3       ~ 42 1
17 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 2041 3

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2023.03.28-19:34:00