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• W62221 abstract "We report the results of a multi-frequency study of three interactinggalaxies: NGC 5218, NGC 1614 and NGC 4194 (the Medusa merger). These sourcesbelong to different classes of active and starburst galaxies.NGC 5218 is a spiral in an early phase of its gravitational interactionwith a nearby elliptical galaxy, and is classified as apure LINER (Low Ionization Nuclear Emission-line Region).NGC 1614 is more luminous and classified as both starburst and LINERwhere the starburst activity takes place in a nuclear ring.It is in a later stage of its interaction than NGC 5218 and is suggestedto bea merger between two unequal-mass spirals. The Medusa (NGC 4194) isa merger of one spiral and one elliptical galaxy. It exhibits intensestar formation activity, and is classified as a starburst. In contrast toNGC 1614 the starburst in the Medusa occurs on scales of several kpc.We have used interferometric techniques at millimeter and decimeterwavelengthsto image the molecular and atomic components in these sources. The 3mm J=1-0transition of CO was imaged in emission and the 21cm atomic hydrogen line wasimaged in absorption toward the radio continuum source. Radio continuumobservationswere also used to map the synchrotron (and thermal) emission associated withthe activity - and to attempt to establish the nature of the nuclearactivity: starburst or AGN (Active Galactic Nucleus). In particular, the goalhas been to establish whether the LINER characteristics of the two firstobjects,NGC 5218 and NGC 1614 are caused by starburst or AGN activity.Sources with LINER activity make up a ratherinhomogeneous, and not yet well understood class, although LINER activityis found in one third of the galaxies in the local bright galaxy population.The LINER spectrum at optical wavelengths has similarities withspectra from both Starburst galaxies and galaxies with AGNs, which raisesthe question whether LINERs are typically driven by starbursts, AGN,a combination, or something else.We also report single dish observations of CO, HCN and HCO+ in NGC 5218and interpret this in terms of dense gas content and nuclear activity.With our multi-frequency observations we have studied the distribution anddynamics of the neutral gas on scales ranging from several kiloparsecsinto the central few hundred parsecs.In the central regions, we have detected significant deviations fromregular circularrotation, caused by supernova-driven large-scale outflows and/or nuclearspiralarms and bars. We present detailed atomic and molecular maps combined withopticalimages to show that these velocity deviations are associated with regionsof intense star formation,past- or ongoing. In general we find that, on the observed scales, themolecularand atomic gas phases are well mixed and trace the same dynamics. The lackof unresolved,high-brightness radio cores indicate that the two LINER sources arestarburst driven." @default.
• W62221 created "2016-06-24" @default.
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• W62221 date "2009-01-01" @default.
• W62221 modified "2023-09-26" @default.
• W62221 title "Multi frequency interferometer studies of active and starburst galaxies" @default.
• W62221 hasPublicationYear "2009" @default.
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