منابع مشابه
Regular magnetic fields in the dwarf irregular galaxy NGC 4449
We present a high-resolution VLA study of the total power and polarized radio continuum emission at 8.46 and 4.86 GHz of the irregular galaxy NGC 4449, known for its weak rotation and non-systematic gas motions. We found strong galaxy-scale regular magnetic fields, which is surprising because of a lack of ordered rotation required for the dynamo action. The strength of the regular field reaches...
متن کاملHot Interstellar Gas in the Irregular Galaxy NGC 4449 1 Dominik
NGC 4449 is an irregular galaxy with a moderately high star formation activity. The massive stars in NGC 4449 have given rise to many bright HII regions, superbubbles, supergiant shells, and “chimney-like” radial filaments. ROSAT X-ray observations of NGC 4449 have revealed four point-like sources and a wide-spread diffuse emission. The spectral properties of the diffuse component suggest that ...
متن کاملKinematics of Ionised Gas in the Barred Seyfert Galaxy NGC 4151
We have determined the structure and kinematics of ionised gas in the weak oval bar of the archetypal Seyfert 1 galaxy, NGC 4151, using the TAURUS Fabry-Perot interferometer to simultaneously map the distribution and kinematics of Hβ emission. We also present broad-band ultraviolet imaging of the host galaxy, obtained with XMM-Newton, that shows the detailed distribution of star formation in th...
متن کاملMulti-density model of the ionised gas in NGC 253 using radio recombination lines
We have imaged the H92α (8.3 GHz), H75α (15 GHz), and H166α (1.4 GHz) Radio Recombination Lines (RRLs) from NGC 253 at resolutions of 4.5 pc (0.4) , 2.5 pc (0.2) and 53 pc (4.5) respectively. The H92α line arises from individual compact sources, most of which possess radio continuum counterparts. The line widths range from ∼200 km s for the sources near the radio nucleus to 70-100 km s for the ...
متن کاملLocalized magnetic reconnection as a cause of extraplanar diffuse ionised gas in the galactic halo
Many observations indicate the occurrence of ionised gas in the distant halos of galaxies (including our own). Since photoionisation by stars (mainly O stars, young or evolved low-mass stars depending on the kind of galaxy) does not seem to be exclusively responsible for the ionisation of the hydrogen filaments that should otherwise cool fast and recombine quickly, the question arises which ext...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Australia
سال: 1998
ISSN: 1323-3580,1448-6083
DOI: 10.1071/as98103