1995A&A...298..400M

Query : 1995A&A...298..400M

1995A&A...298..400M - Astronomy and Astrophysics, volume 298400-404 (1995/6-2)

Upper limits on the MeV emission of Seyfert galaxies.

MAISACK M., COLLMAR W., BARR P., BLOEMEN H., HERMSEN W., LICHTI G.G., McCONNELL M., SCHOENFELDER V., STACY J.G., STEINLE H. and WILLIAMS O.R.

Abstract (from CDS):

The gamma-ray emission of Seyfert galaxies has fallen far short of pre-CGRO expectations. From a sample of 26 X-ray bright Seyfert galaxies, we do not detect a single object of this class in the energy range 0.75-3MeV in COMPTEL data. To derive a more stringent upper limit for the emission from these objects in the energy ranges 0.75-1MeV and 1-3MeV, we have summed a large number of COMPTEL observations acquired during Phase I of the CGRO mission. From a total of 50 observations of 26 individual X-ray selected Seyfert galaxies, we derive upper limits (2 σ) of 1.0x10–7photons/(cm2s keV) in the 0.75-1MeV band and 9.7x10–9photons/(cm2s keV) in the 1-3 MeV band, two orders of magnitude below previously reported detections. Our observations show that if emission at the level previously reported for NGC 4151 and MCG 8-11-11 occurs as a transient phenomenon in Seyfert galaxies, it has a duty cycle of less than 5%.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - Seyfert - gamma rays: observations

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Mrk 335 Sy1 00 06 19.5372339024 +20 12 10.617404076   14.19 13.85     ~ 1344 0
2 Z 521-15 Sy1 01 23 30.1354616112 +34 34 07.486246200   14.7       ~ 21 1
3 ESO 113-45 Sy1 01 23 45.7631533440 -58 48 20.808928944   14.08 13.83 13.34   ~ 965 0
4 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
5 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 1002 2
6 MCG+01-12-009 Bla 04 33 11.0956735296 +05 21 15.619461552   15.72 15.05 10.08   ~ 2099 2
7 Z 395-23 Sy1 05 16 11.4092471904 -00 08 59.157166920   14.30 13.92     ~ 953 1
8 Z 232-3 Sy1 05 54 53.6080860768 +46 26 21.624853488   15.37 14.62     ~ 563 3
9 MCG+05-23-016 Sy1 09 34 06.3274325304 +27 20 59.506582524   16       ~ 76 0
10 NGC 3227 Sy1 10 23 30.5765149296 +19 51 54.282206700   12.61 11.79     ~ 1807 2
11 NGC 3783 Sy1 11 39 01.7096819040 -37 44 19.009642992   12.46 13.43 11.33 12.1 ~ 1765 1
12 NGC 4051 Sy1 12 03 09.6101337312 +44 31 52.682601288   11.08 12.92 9.94   ~ 2270 1
13 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3938 2
14 NGC 4593 Sy1 12 39 39.4435107024 -05 20 39.034988448   13.95 13.15     ~ 1179 0
15 MCG-06-30-015 Sy1 13 35 53.7691256160 -34 17 44.160716796   13.89 13.61 8.9   ~ 1559 0
16 IC 4329A Sy1 13 49 19.2601801224 -30 18 34.213815504   13.81 13.66 12.18 12.35 ~ 876 1
17 NGC 5506 Bla 14 13 14.8761010056 -03 12 27.556909272   15.25 14.38     ~ 1173 1
18 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2895 0
19 ESO 141-55 Sy1 19 21 14.1473895816 -58 40 12.982437480   14.36 13.64 13.28   ~ 394 0
20 NGC 6814 Sy1 19 42 40.5862186152 -10 19 25.108718844   15.33 14.21 11.7 11.3 ~ 866 0
21 Mrk 509 Sy1 20 44 09.7504483224 -10 43 24.727155528   13.35 13.12 10.7   ~ 1370 0
22 LEDA 68751 Sy1 22 23 49.5398449645 -02 06 12.856394895   16.93 15.77 16.02   ~ 511 2
23 NGC 7314 Sy2 22 35 46.1985355872 -26 03 01.564993476   11.62 13.11 10.61 11.4 ~ 601 0
24 NGC 7469 Sy1 23 03 15.6 +08 52 26 12.60 13.00 12.34     ~ 2253 3
25 MCG-02-58-022 Sy1 23 04 43.4776098480 -08 41 08.629476864   16.20 15.91 9.4   ~ 481 1
26 NGC 7582 Sy2 23 18 23.60 -42 22 13.3 11.62 10.92 10.62     ~ 978 3

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