1999MNRAS.310.1033C

Query : 1999MNRAS.310.1033C

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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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 7C 055201.39+394824.00 Bla 05 55 30.80561419 +39 48 49.1649683     18.30 17.5   ~ 527 2
2 Z 294-4 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 2096 3
3 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
4 6C 133556+551617 Bla 13 37 49.6427225424 +55 01 02.113872636   18.62 18.34 18.26   ~ 85 1
5 JCMTSF J134441.8+555312 Rad 13 44 42.05 +55 53 12.3           ~ 2 0
6 Z 271-60 Sy2 13 44 42.1883001099 +55 53 13.596220922   15.68 14.91     ~ 958 3
7 Mrk 273N PoG 13 44 42.1893 +55 53 13.259           ~ 10 0
8 Mrk 273SE PoG 13 44 42.2399 +55 53 12.574           ~ 4 0
9 Mrk 668 BLL 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 826 3

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