Legacy Astronomical Images > Active Galactic Nuclei Series > Seyferts Unit

Description

Seyfert galaxies appear to be normal spiral galaxies, but their cores fluctuate in brightness. It is believed that these fluctuations are caused by powerful eruptions in the core of the galaxy.

Collection Items

Accretion Disk & Supermassive Black Hole
Description: Artist's rendition of the accretion disk and radio jet around the black hole in the heart of the Seyfert galaxy NGC 4258. NGC4258 contains one of the very few galactic nuclei for which astronomers can make images of accretion disk material that lies…

Markarian 348 (NGC 262) - Optical/Radio Composite
Description: Composite optical-HI image of Markarian 348, a Type 2 Seyfert Galaxy. The cold, neutral hydrogen is shown in blue; the stars in the galaxy and the surrounding field are shown in red. The gas distribution spans a diameter of roughly 290 kpc, assuming…

NGC 6764: A Radio Bubble Outflow
Description: NGC6764 is a nearby Seyfert galaxy. The supermassive blackhole at the very centre of this AGN is producing relativistic radio plasma making this galaxy very bright in radio continuum. VLA image at 1.4GHz (in blue) as well as at 5GHz (in red) show a…

3C219
Description: Radio image (red and yellow) is superimposed on an optical V-band field (blue). Radio features include an unresolved "core" at the center of the parent galaxy, a partial jet to the south-west, extended hot spots in both lobes and fine-scale filaments…

3C219
Description: Radio image of the Seyfert galaxy 3C219. Radio features include an unresolved "core" at the center of the parent galaxy, a partial jet to the south-west, extended hot spots in both lobes and fine-scale filaments throughout the lobes. The redshift is…

NGC 4258 Massive Black Hole & Accretion Disk
Description: NGC 4258 is a Seyfert galaxy in the constellation Ursa major. It is generally agreed to have at its heart a supermassive black hole some 39 million times more massive than the Sun. Gas orbiting this black hole has formed a warped disk nearly two…

NGC 4258
Description: NGC 4258 is a Seyfert galaxy in the constellation Ursa major. It is generally agreed to have at its heart a supermassive black hole some 39 million times more massive than the Sun. Gas orbiting this black hole has formed a warped disk nearly two…

Markarian 231
Description: Markarian 231 (Mrk 231) is extremely bright in the infrared and is approximately 166 Megaparsecs distant. It appears to be the result of the merger, nearly a billion years ago, of two separate galaxies. Mrk 231 has the radio signature of a galaxy…

3C120 Radio Jet
Description: This pseudo color image shows the structure of the 1.66 GHz emission from the radio source 3C120 as measured by the VLBA in June 1994. The resolution is 0.015 by 0.007 arcseconds with the higher resolution in the east-west direction. The radio jet is…

NGC 4151 (6 cm)
Description: 6-CM VLBA IMAGE: The above image is a false-color representation of the radio image of the center of the Seyfert galaxy NGC 4151, made at a wavelength of 6 cm (5.0 GHz frequency), using the National Science Foundation's Very Long Baseline Array…

NGC 4151 (18 cm)
Description: 18-CM IMAGE: The above image is a false-color representation of the radio image of the center of the Seyfert galaxy NGC 4151, made at a wavelength of 18 cm (1.6 GHz frequency), using the VLBA. North is up and East is to the left in this image. The…

Superluminal Motions in the Jet of 3C 111
Description: VLBA images of the jet in the broad-line radio galaxy 3C 111. The picture shows the variable parsec-scale structure of the jet in this active galactic nucleus. The features observed correspond to ejected plasma regions traveling at relativistic…

July 2010 Outburst of the NLS1 PMN J0948+0022
Description: The image shows the artists view of a relativistic jet in a spiral galaxy and at the four corners there are the images from different instruments and referring mainly to the powerful gamma-ray outburst of the Narrow-Line Seyfert 1 Galaxy PMN…

Black Hole at NGC4258 Center
Description: An optical image in H-alpha light of the central part of NGC 4258, which shows jet-like structures emerging from the core on a scale of a kiloparsec (3260 light-years). The inset shows the newly discovered molecular disk that contains water vapor…

3C84
Description: VLBA images of 3C84 at multiple wavelengths, on scales of 0.05-5 parsecs, show (contour map A): a central core, an expanding bubble to the south (approaching us); a faint jet connecting the core to the bubble; and a northern (receding) counter-jet,…

Seyfert Galaxy 3C120
Description: The active galaxy 3C120, located at about 450 million light-years near the Orion constelation, hosts a jet of particles with relativistic energies and velocities, observed here at radio wavelengths (1.3 cm) with the VLBA. The monthly sequence of…

Water Masers in NGC 1052
Description: This image is part of a program to monitor the water masers and the continuum emission in NGC 1052 to detect motions of the masers and the continuum "blobs". NGC 1052 is an elliptical galaxy that shows evidence of nuclear activity. It has been…

3C84
Description: The nucleus of the Seyfert galaxy NGC 1275 contains 3C84, one of the brightest, compact radio sources in the sky. This image is a pseudo color representation of the 22 GHz structure of 3C84 as measured using the VLBA and one VLA antenna in October…

Intermediate-Mass Black Hole in NGC 4395
Description: The Seyfert 1 nucleus of NGC 4395 is energized by a black hole of mass 3.6e5 Solar masses, making it one of only two nuclear black holes of intermediate mass, about 1e3 to 1e6 Solar masses, detected in the radio regime. Building upon UV and X-ray…

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