Collimated Nuclear Ejection of Radio-Emitting Plasma in the Seyfert Galaxy NGC 4388
Abstract
We present new 6 cm and 20 cm continuum VLA maps of the edge-on Seyfert galaxy NGC 4388. These observations reveal a double-peaked radio source close to (but not coincident with) the optical Seyfert nucleus. Additionally, a cloud of radio-emitting material, apparently ejected from the nucleus, extends beyond the double-peaked source into the halo of the galaxy. The radio spectra indicate nonthermal emission. Mid-infrared observations reveal that the 10 micron source is displaced from the optical nucleus in a direction similar to that in which the radio emission is displaced. The overall radio structure is bent, with the outer structure aligning roughly perpendicular to the galaxy disk. We suggest that either gravitational buoyancy, jet precession, or a combination thereof are responsible for this radio morphology.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 1988
- DOI:
- 10.1086/166458
- Bibcode:
- 1988ApJ...330..105S
- Keywords:
-
- Cosmic Plasma;
- Galactic Nuclei;
- Nuclear Radiation;
- Radio Emission;
- Seyfert Galaxies;
- Stellar Mass Ejection;
- Disk Galaxies;
- Extragalactic Radio Sources;
- Radio Jets (Astronomy);
- Very Large Array (Vla);
- Astrophysics;
- GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4388;
- GALAXIES: JETS;
- GALAXIES: NUCLEI;
- GALAXIES: SEYFERT;
- RADIO SOURCES: GALAXIES