Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348414l&link_type=abstract
American Astronomical Society, AAS Meeting #213, #444.09; Bulletin of the American Astronomical Society, Vol. 41, p.455
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a Spitzer 8-micron map of the nearby spiral galaxy NGC 4258, known for its AGN and radio jets. The 8-micron emission is the best tracer of the spiral pattern because it follows the hot dust emission in the disk of the galaxy and is mostly unaffected by extinction. We confirmed this by wavelet analysis of the 8-micron, H-alpha and 3.5-cm radio continuum maps. One-dimensional flux profiles taken across the (projected position of the) radio jet in the 3.5-cm radio continuum and the 8-micron maps reveal an anticorrelation between the strength of the radio emission and the strength of the 8-micron emission at many profile positions. This may indicate an interaction between the dust in the disk and the radio jet, at least within the inner 4 kpc. Furthermore, the cold molecular gas, traced by CO, forms ridges along the edges of the radio jet within 2.8 kpc of the nucleus, as shown in a previous investigation. Together these observations constrain the geometry of the jet-disk system and enable an investigation of dust destruction by large-scale galactic jets.
Krause Marita
Laine Seppo J.
Siopis Christos
Tabatabaei Fatemeh
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