Resolving the Controversy about the Anomalous Arms in NGC 4258

Details Resolving the Controversy about the Anomalous Arms in NGC 4258 Resolving the Controversy about the Anomalous Arms in NGC 4258

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20801l&link_type=abstract

Spitzer Proposal ID #20801

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Scientific paper

NGC 4258 is an exceptional nearby spiral galaxy with anomalous kpc-scale radio continuum and ionized hydrogen arms. These arms have been interpreted as jet features by most investigators, but an alternative explanation as a bar-induced feature has also been presented. Understanding the unique radio continuum morphology is important. To do that, the question of the origin of the anomalous structure must be first settled. We propose IRAC observations of the PAH emission near 8 microns in this galaxy. These observations have the potential of settling the origin of the anomalous feature in NGC 4258. A bar-induced origin would predict single ridges of emission along the leading edges of the bar. On the other hand, a jet would bore through the ISM and create a channel and the emission would have two ridges. Thus the extinction-free morphology of the PAH emission would reveal the origin of the anomalous feature. We will also get 4.5 micron images that would reveal the exact location of any oval distortion of bar in the galaxy. PAH emission is expected to be excited since there is lots of ionized hydrogen emission along the anomalous feature. Short (1 hour) observations are requested. The results will be compared to another barred galaxy with a possible kpc-scale anomalous radio continuum feature, NGC 7479. Observations for that galaxy will be obtained in a GTO program and we will take them from the archive when they become available in the summer of 2005.

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