2019MNRAS.485.3277G

Query : 2019MNRAS.485.3277G

2019MNRAS.485.3277G - Mon. Not. R. Astron. Soc., 485, 3277-3287 (2019/May-3)

Fermi-LAT observations of extreme spectral variability in IC 310.

GRAHAM J.A., BROWN A.M. and CHADWICK P.M.

Abstract (from CDS):

We investigate the physical mechanisms of high-energy gamma-ray emission from the TeV-emitting misaligned active galactic nucleus IC 310. 8 yr of data from the Fermi Large Area Telescope (Fermi-LAT) between 100 MeV and 500 GeV are reduced and analysed to study the temporal and spectral characteristics of IC 310. Point spread function-partitioned instrument response functions are used to improve the resolvability of IC 310 from nearby NGC 1275. Systematic effects due to this choice of instrument response functions and the proximity of NGC 1275 are investigated. We find strong spectral variability and detect the hard flaring state of IC 310 along with a previously undiscovered soft state in quiescent periods, and the first detection with Fermi-LAT below 1 GeV. This represents a shift in peak Compton energy of more than 5 orders of magnitude. Possible interpretations are discussed, but we lack the instantaneous sensitivity with Fermi to probe the underlying physics.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: active - BL Lacertae objects: individual: IC 310

Nomenclature: Table 1: [GBC2019] PS JHHMM.m+DDMM N=9.

Simbad objects: 16

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Number of rows : 16
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 [GBC2019] PS J0233.0+3740 gam 02 33.0 +37 40           ~ 1 0
2 [GBC2019] PS J0257.1+3400 gam 02 57.1 +33 59           ~ 1 0
3 [GBC2019] PS J0302.5+3353 gam 03 02.5 +33 53           ~ 1 0
4 [GBC2019] PS J0312.8+4121 gam 03 12.8 +41 21           ~ 1 0
5 IC 310 AGN 03 16 42.9787569912 +41 19 29.615579544   14.3       ~ 311 2
6 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
7 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
8 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
9 [GBC2019] PS J0344.2+3202 gam 03 44.2 +32 02           ~ 1 0
10 [GBC2019] PS J0344.6+3433 gam 03 44.6 +34 33           ~ 1 0
11 [GBC2019] PS J0355.3+3910 gam 03 55.3 +39 10           ~ 1 0
12 [GBC2019] PS J0359.4+5052 gam 03 59.4 +50 52           ~ 1 0
13 6C 035545+504923 Bla 03 59 29.74727351 +50 57 50.1618607           ~ 480 1
14 [GBC2019] PS J0410.7+4218 gam 04 10.7 +42 18           ~ 1 0
15 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
16 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3

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