The Seyfert Galaxy NGC 1275: Superfine Structure

• Published in: Astronomy letters 2019-08, Vol.45 (8), p.475-489
• Main Authors: Matveyenko, L. I., Sivakon, S. S.
• Format: Article
• Language: English
• Subjects: Angular momentum; Archives & records; Astronomy; Astrophysics and Astroparticles; Coaxial flow; Ejection; Emission analysis; Fine structure; Fluid dynamics; Fluid flow; Galaxies; Nozzles; Observations and Techniques; Physics; Physics and Astronomy; Relativistic plasmas; Ring structures; Seyfert galaxies; Ultrafines; Vortices
• ISSN: 1063-7737; 1562-6873
• DOI: 10.1134/S1063773719080061

Based on VLBA observations (NRAO archive) at λ = 2 cm, we have constructed radio maps of the Seyfert galaxy NGC 1275 with a resolution of 25 µ as, the epochs of 1995–2015, and at λ = 7 mm (Boston University archive), the epochs of 2000–2015, with a resolution of 20 µas. We have identified a ring structure with a diameter ϕ ≈ 2 mas (1 pc) inclined at 60° to the plane of the sky that includes three centers of activity, vortices. The surrounding relativistic plasma comes to the main northern center along two arms and is ejected in the southward direction X ≈ −10° of a hollow tube, a jet with a diameter ϕ ≈ 0.12 mas. The second center of activity, a vortex whose plane is parallel to the jet, is located in the remote part of the jet at a distance ρ ≈ 2.5 mas. An excess angular momentum is carried away by a coaxial flow with ∅ 21 ≈ 0.8 mas and ∅ 22 ≈ 0.3 mas in the eastward direction X ≈ −90°, where the third center of activity is formed. A coaxial flow with ∅ 31 ≈ 0.7 mas and ∅ 32 ≈ 0.35 mas is ejected in the northward direction. The projections of both coaxial flows form mesh points on the plane of the sky. The nozzle splitting in the first system is observed at a resolution of 3 µ as. The sizes of the two succeeding centers of activity are 80 × 40 and 80 × 120 µ as. The results of our studies of the fine structure of galaxies in polarized emission will be published in the next paper (II).