Nuclear Radio Continuum Emission of Low-Luminosity Active Galactic Nucleus NGC 4258

Details Nuclear Radio Continuum Emission of Low-Luminosity Active Galactic Nucleus NGC 4258 Nuclear Radio Continuum Emission of Low-Luminosity Active Galactic Nucleus NGC 4258

2011-06-15

arxiv.org/abs/1106.2930v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 4 figures, submitted to ApJ

Scientific paper

The nearby low-luminosity active galactic nucleus (LLAGN) NGC 4258 has a weak radio continuum emission at the galactic center. Quasi-simultaneous multi-frequency observations using the Very Large Array (VLA) from 5 GHz (6 cm) to 22 GHz (1.3 cm) showed inverted spectra in all epochs, which were intra-month variable, as well as complicated spectral features that cannot be represented by a simple power law, indicating multiple blobs in nuclear jets. Using the Nobeyama Millimeter Array (NMA), we discovered a large amplitude variable emission at 100 GHz (3 mm), which had higher flux densities at most epochs than those of the VLA observations. A James Clerk Maxwell Telescope (JCMT) observation at 347 GHz (850 micron) served an upper limit of dust contamination. The inverted radio spectrum of the nucleus NGC 4258 is suggestive of an analogy to our Galactic center Sgr A*, but with three orders of magnitude higher radio luminosity. In addition to the LLAGN M 81, we discuss the nucleus of NGC 4258 as another up-scaled version of Sgr A*.

Affiliated with

Also associated with

No associations

Rating

Nuclear Radio Continuum Emission of Low-Luminosity Active Galactic Nucleus NGC 4258 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Nuclear Radio Continuum Emission of Low-Luminosity Active Galactic Nucleus NGC 4258, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nuclear Radio Continuum Emission of Low-Luminosity Active Galactic Nucleus NGC 4258 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-658375