Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344403r&link_type=abstract
American Astronomical Society, AAS Meeting #213, #444.03; Bulletin of the American Astronomical Society, Vol. 41, p.326
Astronomy and Astrophysics
Astronomy
Scientific paper
We report recent results on the atomic layer of the massive edge-on spiral NGC 5746, and present new constraints on lagging atomic halos in the edge-ons NGC 4244 and NGC 4565. NGC 5746 has a low level of star formation and no detected extraplanar diffuse ionized gas, yet was found to have a bright X-ray halo, which has been interpreted as a residual halo as predicted in dissipational models of galaxy formation. Such models also predict thermal instabilities in such gas, leading to infall of warm clouds onto the disk. Thus extraplanar gas may originate in a disk-halo flow and/or primordial infall. Our VLA maps reveal extensive extraplanar gas, but it is better modeled as a warp along the line of sight than as a halo. However, a few extraplanar clouds totaling about 100 million solar masses are found at velocities distinct from the warp. These could be infalling clouds or part of a weak disk-halo cycle. From WSRT data, a lag in NGC 4244 is limited to < 10 km/s/kpc up to z=2 kpc, while NGC 4565 may have a lag of 10 km/s/kpc, up to z=2 kpc, but only at about R < 3'.
Benjamin Robert A.
Dahlem Michael
Rand Richard J.
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