The University of Southampton
University of Southampton Institutional Repository

Faint gamma-ray sources at low redshift: the radio galaxy IC 1531

Faint gamma-ray sources at low redshift: the radio galaxy IC 1531
Faint gamma-ray sources at low redshift: the radio galaxy IC 1531
We present a multiwavelength study of IC 1531 (z = 0.02564), an extragalactic radio source associated with the γ-ray object 3FGL J0009.9 − 3206 and classified as a blazar of uncertain type in the Third Fermi-Large Area Telescope AGN catalog (3LAC). A core-jet structure, visible in radio and X-rays, is enclosed within a ∼220 kpc wide radio structure. The morphology and spectral characteristics of the kiloparsec jet in radio and X-rays are typical of Fanaroff–Riley type I galaxies. The analysis of the radio data and optical spectrum and different diagnostic methods based on the optical, infrared, and γ-ray luminosities also support a classification as a low-power RG seen at moderate angles (θ = 10°–20°). In the framework of leptonic models, the high-energy peak of the non-thermal nuclear spectral energy distribution can be explained in terms of synchrotron-self-Compton emission from a jet seen at θ ∼ 15°. Similarly to other misaligned AGNs detected by Fermi, the required bulk motion is lower (Γbulk = 4) than the values inferred in BL Lac objects, confirming that, because of the de-boosting of emission from the highly relativistic blazar region, these nearby systems are valuable targets to probe the existence of multiple sites of production of the most energetic emission in the jets.
0035-8711
5236-5246
Bassi, T.
762161cb-7799-465b-9e2c-199195a10187
Migliori, G.B.
c2390f7b-d6a8-43fa-9965-7db89de22ec4
Grandi, P.
dc72fd8c-579e-45cc-b360-bc56397dbce9
Vignali, C.
b6521f25-b2ed-4feb-b4c0-debd78f44676
Perez-Torres, M.
5d14a3d7-f162-443b-850c-6b93e0187c0a
Baldi, R.
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Torresi, E.
8ca2ab9f-7689-4c9a-9a32-68b6554686bf
Siemiginowska, A.
56ff624a-15bf-42f3-928f-4b5af590cc45
Stanghellini, C.
a24e42ba-8a0f-4fc5-a28f-621c3b1d0b17
Bassi, T.
762161cb-7799-465b-9e2c-199195a10187
Migliori, G.B.
c2390f7b-d6a8-43fa-9965-7db89de22ec4
Grandi, P.
dc72fd8c-579e-45cc-b360-bc56397dbce9
Vignali, C.
b6521f25-b2ed-4feb-b4c0-debd78f44676
Perez-Torres, M.
5d14a3d7-f162-443b-850c-6b93e0187c0a
Baldi, R.
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Torresi, E.
8ca2ab9f-7689-4c9a-9a32-68b6554686bf
Siemiginowska, A.
56ff624a-15bf-42f3-928f-4b5af590cc45
Stanghellini, C.
a24e42ba-8a0f-4fc5-a28f-621c3b1d0b17

Bassi, T., Migliori, G.B., Grandi, P., Vignali, C., Perez-Torres, M., Baldi, R., Torresi, E., Siemiginowska, A. and Stanghellini, C. (2018) Faint gamma-ray sources at low redshift: the radio galaxy IC 1531. Monthly Notices of the Royal Astronomical Society, 481 (4), 5236-5246. (doi:10.1093/mnras/sty2622).

Record type: Article

Abstract

We present a multiwavelength study of IC 1531 (z = 0.02564), an extragalactic radio source associated with the γ-ray object 3FGL J0009.9 − 3206 and classified as a blazar of uncertain type in the Third Fermi-Large Area Telescope AGN catalog (3LAC). A core-jet structure, visible in radio and X-rays, is enclosed within a ∼220 kpc wide radio structure. The morphology and spectral characteristics of the kiloparsec jet in radio and X-rays are typical of Fanaroff–Riley type I galaxies. The analysis of the radio data and optical spectrum and different diagnostic methods based on the optical, infrared, and γ-ray luminosities also support a classification as a low-power RG seen at moderate angles (θ = 10°–20°). In the framework of leptonic models, the high-energy peak of the non-thermal nuclear spectral energy distribution can be explained in terms of synchrotron-self-Compton emission from a jet seen at θ ∼ 15°. Similarly to other misaligned AGNs detected by Fermi, the required bulk motion is lower (Γbulk = 4) than the values inferred in BL Lac objects, confirming that, because of the de-boosting of emission from the highly relativistic blazar region, these nearby systems are valuable targets to probe the existence of multiple sites of production of the most energetic emission in the jets.

Text
Faint gamma-ray sources at low redshift- the radio galaxy IC 1531 - Accepted Manuscript
Download (554kB)

More information

Accepted/In Press date: 19 September 2018
e-pub ahead of print date: 26 September 2018
Published date: December 2018

Identifiers

Local EPrints ID: 427942
URI: https://eprints.soton.ac.uk/id/eprint/427942
ISSN: 0035-8711
PURE UUID: c4262504-59f3-4e42-9c50-97e4f37f0b76

Catalogue record

Date deposited: 05 Feb 2019 17:30
Last modified: 13 Mar 2019 17:36

Export record

Altmetrics

Contributors

Author: T. Bassi
Author: G.B. Migliori
Author: P. Grandi
Author: C. Vignali
Author: M. Perez-Torres
Author: R. Baldi
Author: E. Torresi
Author: A. Siemiginowska
Author: C. Stanghellini

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×