3C48: Evidence for two merger nuclei? Submillimeter Astronomy

3C48: Evidence for two merger nuclei? Submillimeter Astronomy in the era of the SMA June 13, 2005 Melanie Krips University of Cologne Andreas Eckart Roberto Neri Jens Zuther Dennis Downes Julia Scharwaechter University of Cologne

IRAM, France University of Cologne IRAM, France University of Cologne The Mice - Interacting galaxies NGC4676 @ Hubblesite.org 3C48 Pro Merger: Stockton & Ridgeway 1991 Feng et al. 2005 3C48A 3C48A

jet Nucleus core counterjet " tail" towards NW (e.g. Stockton & Ridgeway 1991) bright host galaxy

with large gas mass of 31010M (Scoville et al. 1993; Wink et al. 3C48 Contra Merger: Feng et al. 2005 3C48A 3C48A where is counter jet

Nucleus core tail? like Antennae galaxies but counterjet seen from a different viewing angle (Scharwaechter et al. 2004) Nature of 3C48A? 2nd nucleus or interaction of the

3C48 1.2mm & 3.5mm continuum New IRAM PdBI Observations (~12"): (Krips et al., accept. at A&A) continumm: 3.5 & 1.2mm line: 12CO(1-0) (merged with Wink et al. 1997)

3C48 1.2mmcontinuum continuum emission 1.2mm emission MERLIN 1.6GHz (18cm) Feng et al. 2005 Results (continuum): QSO 3C48A jet

1st map of continuum at 1.2mm in very good agreement with radio maps 3C48 1.2mm continuum emission Continuum model: 2 Gaussian model is not enough: residuum noise 3 Gaussian model

fits much better (4) 3C48 Feng et al. 2005 new PdBI data 3C48 Stockton & Ridgeway 1991 Results (12CO(1-0)): CO(1-0) consistent with

Wink 3 different lines? et al. 1997 and Scoville et al. 1993 extended emission total molecular gas mass: 1-61010M 3C48 two different positions! 3C48

CO-disks Molecular gas masses: 3C48A 1.0-3.61010M QSO-blue 0.2-0.91010M one QSO-red 0.2-0.91010M component 3C48A has largest gas mass!!! 3C48 3C48A QSO

3C48 Outlook still need further observations extended PdBI to separate the 2 CO systems SMA to reveal further the non-thermal and/or thermal continuum emission at higher frequencies

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