NRAO: National Radio Astronomy Observatory

About this Image

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 a distance of 95 Mpc for Mkn 348, and is one of the largest such structures known. The fuzzy, red blob to the right of the main optical galaxy but embedded in the central, blue HI gas has the same redshift as Mkn 348 and is thought to be tidally disrupting the main galaxy. This tidal disruption may be responsible for the excess energy in the galaxy's Seyfert nucleus.

Investigator(s):  S.M. Simkin, J.H. van Gorkom, and H.-J. Su

Alternate Resolutions

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This image is available in the following downloadable versions:

• 432 x 437 color JPEG
• 900 x 911 color JPEG
• 2371 x 2400 color TIFF

If you would like to obtain a higher resolution version of this image, please contact Pat Smiley.

For More Information

• Read the Journal article
• Visit related website http://www.cv.nrao.edu/~jhibbard/mk348/
• Up one level for more info on Seyferts
• For unfamiliar terms, visit the NRAO Radio Astronomy Glossary

Technical Data

Telescope	ALMA
Date of Observation	1984-08-16
Type of Observation	Spectral Line Observations
Wavelength	21 cm
Frequency	1420.4 MHz
Species	HI
Center of Image	RA: 00:48:47.14, Dec: 31:57:25.10
Field of View	0.5000 x 0.5000 degrees
Technical Caption	Optical data was obtained from four deep Palomar Schmidt images (90-minute exposures) taken with broadband filters centered at approximately 4800 A and 6500 A. The HI 21-cm emission line radio data was taken at the VLA using 25 antennas for 6 hours in the C-configuration and for 4 hours in the D-configuration. Sum of 13 velocity channels (4604 to 4476 km/s)



Astronomical database entries for ngc262
• Query NED for images of ngc262
• Query SIMBAD for more ngc262 data

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