Astron. J., 144, 156 (2012/November-0)
NGC 2207/IC 2163: a grazing encounter with large-scale shocks.
KAUFMAN M., GRUPE D., ELMEGREEN B.G., ELMEGREEN D.M., STRUCK C. and BRINKS E.
Abstract (from CDS):
Radio continuum, Spitzer infrared, optical, and XMM-Newton X-ray and ultraviolet observations (UVW1 and UVM2) are used to study large-scale shock fronts, young star complexes, and the galactic nuclei in the interacting galaxies NGC 2207/IC 2163. There are two types of large-scale shock fronts in this galaxy pair. The large-scale shock front along the rim of the ocular oval in IC 2163 has produced vigorous star formation in a dusty environment, bright in the Spitzer 8 µm and 24 µm images. In the outer part of the companion side of NGC 2207, a large-scale front attributed to halo scraping is particularly bright in the λ6 cm and λ20 cm radio continuum but not in any tracers of recent star formation (Hα, 8 µm, 24 µm, or ultraviolet emission) or in X-rays. This radio-continuum front may be from compression of the halo magnetic field on the back side of NGC 2207, between the two galaxies. The X-ray emission sets an upper limit to the gas density in the halo. Values of the flux density ratio Sν(8 µm)/S ν(6 cm) of prominent, kiloparsec-size, Spitzer/IRAC star-forming clumps in NGC 2207/IC 2163 are compared with those of giant radio H II regions in M81. For the bright clumps in NGC 2207, the mean value of this ratio is the same as for the M81 H II regions, whereas for the bright clumps on the rim of the IC 2163 ocular oval, the mean value is nearly a factor of two greater. Possible explanations for this are discussed. The galaxy pair has global values of the ratios of infrared-to-radio continuum flux density in the Spitzer 8 µm, 24 µm, and 70 µm bands, and the IRAS FIR significantly below the medians/means for large samples of galaxies. Feature i, a mini-starburst on an outer arm of NGC 2207 on its anti-companion side, is the most luminous 8 µm, 24 µm, 70 µm, radio continuum, and Hα source in the galaxy pair. We find evidence that a radio supernova was present in the core of feature i in 2001. X-ray emission is detected from the nucleus of NGC 2207 and from nine discrete sources whose X-ray luminosities make them possible candidates for Ultraluminous X-ray sources. One of these corresponds with the Type Ib SN 1999ec, which is also bright in the ultraviolet, and another may be a radio supernova or a background quasar. The X-ray luminosity of the NGC 2207 nucleus is log L_0.3-10.0 keV_= 40.6 erg/s, which, together with its X-ray spectrum, suggests that this is a highly absorbed, low-luminosity, active galactic nucleus.
galaxies: individual: NGC 2207/IC 2163 - galaxies: interactions - radio continuum: galaxies - supernovae: individual: SN 1999ec - X-rays: galaxies
Table 3: [KGE2012] u1 N=1, [KGE2012] rc1 N=1. Fig. 7, Table 7: [KGE2012] XNN (Nos X1-X10).
IR NNN = [EEK2006] NNN ; KNNN = [KBK87] NNN ; NN = [EKB95] NN ; SSC NN = [EKE2001] NN (no positions, not in Simbad).
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