2015A&A...575A..55A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST06:32:16

2015A&A...575A..55A - Astronomy and Astrophysics, volume 575A, 55-55 (2015/3-1)

Radio jet emission from GeV-emitting narrow-line Seyfert 1 galaxies.

ANGELAKIS E., FUHRMANN L., MARCHILI N., FOSCHINI L., MYSERLIS I., KARAMANAVIS V., KOMOSSA S., BLINOV D., KRICHBAUM T.P., SIEVERS A., UNGERECHTS H. and ZENSUS J.A.

Abstract (from CDS):

With the current study we aim at understanding the properties of radio emission and the assumed jet from four radio-loud and γ-ray-loud narrow-line Seyfert 1 galaxies that have been detected by Fermi. These are Seyfert 1 galaxies with emission lines at the low end of the FWHM distribution. The ultimate goal is twofold: first we investigate whether a relativistic jet is operating at the source producing the radio output, and second, we quantify the jet characteristics to understand possible similarities with and differences from the jets found in typical blazars. We relied on the most systematic monitoring of radio-loud and γ-ray-detected narrow-line Seyfert 1 galaxies in the cm and mm radio bands conducted with the Effelsberg 100m and IRAM 30m telescopes. It covers the longest time-baselines and the most radio frequencies to date. This dataset of multi-wavelength, long-term radio light-curves was analysed from several perspectives. We developed a novel algorithm to extract sensible variability parameters (mainly amplitudes and time scales) that were then used to compute variability brightness temperatures and the corresponding Doppler factors. The jet powers were computed from the light curves to estimate the energy output and compare it with that of typical blazars. The dynamics of radio spectral energy distributions were examined to understand the mechanism causing the variability. The length of the available light curves for three of the four sources in the sample allowed a firm understanding of the general behaviour of the sources. They all display intensive variability that appears to be occurring at a pace rather faster than what is commonly seen in blazars. The flaring events become progressively more prominent as the frequency increases and show intensive spectral evolution that is indicative of shock evolution. The variability brightness temperatures and the associated Doppler factors are moderate, implying a mildly relativistic jet. The computed jet powers show very energetic flows. The radio polarisation in one case clearly implies a quiescent jet underlying recursive flaring activity. Finally, in one case, the sudden disappearance of a γ-ray flare below some critical frequency in our band needs a more detailed investigation of the possible mechanism causing the evolution of broadband events. Despite the generally lower flux densities, the sources appear to show all typical characteristics seen in blazars that are powered by relativistic jets, such as intensive variability, spectral evolution across the different bands following evolutionary paths explained by travelling shocks, and Doppler factors indicating mildly relativistic speeds.

Abstract Copyright:

Journal keyword(s): galaxies: active - gamma rays: galaxies - galaxies: jets - galaxies: Seyfert - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/A+A/575/A55): j0324p34.dat j0849p51.dat j0948p00.dat j1505p03.dat>

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3C 16 rG 00 37 44.50 +13 19 55.0   21       ~ 116 3
2 Mrk 359 Sy1 01 27 32.5219447154 +19 10 43.837247537   14.89 14.22     ~ 273 0
3 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2497 2
4 UGC 1775 IG 02 18 26.3986814257 +05 39 13.991952899   14.2       ~ 64 0
5 QSO J0324+3410 BLL 03 24 41.1612231119 +34 10 45.856728058     15.72 13.1   ~ 199 1
6 2C 553 QSO 06 27 10.1 -05 53 06           ~ 148 1
7 ICRF J084957.9+510829 Sy1 08 49 57.97682961 +51 08 29.0234509   19.37 18.78 17.79   ~ 194 2
8 2MASS J09485730+0022261 Sy1 09 48 57.3204380262 +00 22 25.561362007   18.85 18.61 18.17   ~ 247 2
9 Mrk 42 Sy1 11 53 41.7727871132 +46 12 42.171866526   16.24 15.45     ~ 192 0
10 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3716 1
11 3C 295 Sy2 14 11 20.467 +52 12 09.52   22.34 20.80 18.54   ~ 896 5
12 ICRF J150506.4+032630 Sy1 15 05 06.47715917 +03 26 30.8126616   19.02 18.62 17.72   ~ 196 1
13 NAME K 3-50A HII 20 01 45.6 +33 32 42           ~ 75 0
14 ICRF J200755.1-443444 Sy1 20 07 55.1830395039 -44 34 44.280287434   19.3 19.3 18   ~ 135 1
15 NGC 7027 PN 21 07 01.8 +42 14 10   9.1 10.9     ~ 2323 1

    Equat.    Gal    SGal    Ecl

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2020.07.16-06:32:16

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