Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921704a&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #217.04; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We present Spitzer IRS Mid-IR spectroscopy of a sub-set of collisional ring galaxies from a larger sample being observed with the imaging cameras on Spitzer, and in the UV with Galex. The paper will concentrate on three systems that have been studied in detail: Arp 143, LT 41 and NGC 985. In Arp 143 and LT 41 we investigate the variations in PAH strength with underlying UV/opt/IR continuum, and discuss the discovery of powerful molecular hydrogen emission from the nucleus and inter-ring region in Arp 143. In the X-ray luminous Seyfert I ring galaxy NGC 985, we present evidence for anomalously strong emission from the 16-20 micron PAH "plateau" as compared with the PAH feature at 11.2 microns. We suggest that the large ratio of this emission ( L(16-20)/L(11.2)= 5.5), the largest yet seen in any galaxy nucleus, is the result of shocks, perhaps relating to a circumnuclear wind colliding with infalling molecular material--as suggested by previous BIMA, ISO, UV absorption line and XMM observations. Strong molecular hydrogen emission is also seen which may also have an origin in shocks.
Appleton Philip N.
Armus Lee
Beirao P.
Brandl Berhard
Charmandaris Vassilios
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