SIMBAD references

1999MNRAS.310.1033C - Mon. Not. R. Astron. Soc., 310, 1033-1038 (1999/December-3)

Neutral gas and dust in the central region of the ultraluminous infrared galaxy Mrk273.

COLE G.H.J., PEDLAR A., HOLLOWAY A.J. and MUNDELL C.G.

Abstract (from CDS):

We have used MERLIN to observe neutral hydrogen absorption against the central region of the ultraluminous infrared galaxy (ULIRG) galaxy Mrk273 with an angular resolution of 0.2arcsec. This represents a factor of 5 increase in resolution compared with previous work. Absorption has been resolved against two of three radio continuum components. A Hubble Space Telescope (HST) image reveals a complex central region composed of clumpy emission obscured by dust lanes. We find that the northern and south-eastern radio components are associated with two optical components. The alignment supports the idea that Mrk273 has a double nucleus due to a recent galactic merger event.

Broad, strong and spatially varying absorption is seen against the northern radio component with a velocity gradient of 1990±50kms–1kpc–1. The absorption resolves into six discrete components with an average column density of 1.7x1022atomcm–2. We propose that the absorption is due to a clumpy ring or disc of neutral gas of radius ∼250pc rotating around a central starburst. In addition to the broad component, narrow absorption (<100kms–1) is detected against the northern and south-eastern components. Absorption is not detected against the weak (2mJy) south-western component. We propose that the narrow absorption is due to quiescent gas in a large-scale dust lane that coincides with these regions of narrow absorption.


Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): dust, extinction - galaxies: individual: Mrk273 - galaxies: Seyfert - galaxies: starburst - infrared: galaxies - radio continuum: ISM

Nomenclature: Fig.1, Table 1: [CPH99] A (Nos A-C).

CDS comments: Table 1: absorption components 'Aa'and 'BN' not in SIMBAD.

Simbad objects: 9

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