2023ApJ...943..136S

Query : 2023ApJ...943..136S

2023ApJ...943..136S - Astrophys. J., 943, 136 (2023/February-1)

The Radio Structure of the γ-Ray Narrow-line Seyfert 1 Galaxy SDSS J211852.96-073227.5.

SHAO X., GU M., CHEN Y., YANG H., YAO S., YUAN W. and SHEN Z.

Abstract (from CDS):

The γ-ray narrow-line Seyfert 1 (NLS1) galaxies can be considered to be the third class of γ-ray active galactic nuclei possessing relativistic jets. In this paper, we present multi-band high-resolution Very Long Baseline Array (VLBA) images of the γ-ray NLS1, SDSS J211852.96-073227.5 (J2118-0732, z = 0.26). We find a core-jet radio morphology and significant flux density variations in the radio core. The high brightness temperature estimated from VLBA images and core variability demonstrate that it exhibits substantial relativistic beaming effects. By considering radio emission in several bands, we find that the source has an inverted spectrum above 1 GHz but a steep spectrum at low frequencies ranging from 74 MHz-1 GHz; these may arise from the present activity and the old diffuse/extended emission, respectively. The core-jet morphology, significant flux density variations, and beaming effect make J2118-0732 resemble a blazar. Considering the low mass of its central black hole and the ongoing merger environment, J2118-0732 may represent a low-mass, low-power counterpart of blazars, and may finally evolve into a blazar.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Radio jets - Active galactic nuclei - Seyfert galaxies - Radio cores

Simbad objects: 21

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Number of rows : 21
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 6C 032130+340016 BLL 03 24 41.1612813408 +34 10 45.857918460     15.72 13.1   ~ 314 1
2 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 334 0
3 QSO J0849+5108 BLL 08 49 57.97685916 +51 08 29.0238146   19.37 18.78 17.79   ~ 270 2
4 6C 092913+531943 Bla 09 32 41.1507769128 +53 06 33.806842272   19.38 19.18 18.82   ~ 100 1
5 QSO J0948+0022 Bla 09 48 57.32005819 +00 22 25.5596984   18.85 18.61 18.17   ~ 350 2
6 Ton 469 Bla 09 58 20.9496221568 +32 24 02.208417372   15.88 15.78 15.51   ~ 442 1
7 FBQS J1102+2239 Sy1 11 02 23.3840900544 +22 39 20.699446932     19.5     ~ 37 0
8 4C 04.42 Bla 12 22 22.54962606 +04 13 15.7760715   17.88 17.98 17.06   ~ 354 1
9 PB 4215 Sy1 12 46 34.6524231888 +02 38 09.106661148   18.74 18.46     ~ 55 1
10 6C 130312+513213 Sy1 13 05 22.7454747504 +51 16 40.206559080   17.65 17.40     ~ 62 1
11 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
12 7C 141903.20+390906.00 Bla 14 21 06.0317325120 +38 55 22.827690552   19.01 18.92 17.6   ~ 59 1
13 6C 144133+473846 QSO 14 43 18.5610671304 +47 25 56.676226944   18.61 18.48     ~ 54 1
14 QSO J1505+0326 Bla 15 05 06.47716039 +03 26 30.8125704   19.02 18.62 17.72   ~ 278 1
15 6C 151853+422209 Bla 15 20 39.7213 +42 11 11.457       18.09   ~ 78 1
16 SDSS J164100.10+345452.6 Sy2 16 41 00.0964151352 +34 54 52.658959788   19.36 18.58     ~ 31 0
17 QSO J1644+2619 Bla 16 44 42.5339200680 +26 19 13.227002976   18.80 18.42     ~ 114 1
18 6C 170021+683437 Bla 17 00 09.29285259 +68 30 06.9591278     17.00 18.47   ~ 143 1
19 QSO B2004-447 Bla 20 07 55.1842447944 -44 34 44.274118260   19.3 19.3 18   ~ 185 1
20 2MASS J21185296-0732275 Sy1 21 18 52.9632528816 -07 32 27.590693424   20.07 19.48     ~ 62 1
21 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1

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