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Titolo:
Anatomy of the counterrotating molecular disk in the spiral NGC 3593 (CO)-C-12(1-0) interferometer observations and numerical simulations

Autore:

Garcia-Burillo, S; Sempere, MJ; Combes, F; Hunt, LK; Neri, R;

Indirizzi:: Observ Astron Nacl, IGN, Alcala De Henares 28800, Madrid, Spain Observ Astron Nacl Alcala De Henares Madrid Spain 28800 00, Madrid, Spain CSIC, Inst Estructura Mat, E-28006 Madrid, Spain CSIC Madrid Spain E-28006 IC, Inst Estructura Mat, E-28006 Madrid, Spain Observ Paris, DEMIRM, F-75014 Paris, France Observ Paris Paris France F-75014 v Paris, DEMIRM, F-75014 Paris, France CNR, Ctr Astron Infrarossa & Studio Mezzo Interstellar, I-50125 Florence, Italy CNR Florence Italy I-50125 o Mezzo Interstellar, I-50125 Florence, Italy Inst Radio Astron Millimetr, F-38406 St Martin Dheres, France Inst Radio Astron Millimetr St Martin Dheres France F-38406 eres, France
Titolo Testata:: ASTRONOMY AND ASTROPHYSICS
fascicolo: 3, volume: 363, anno: 2000,
pagine: 869 - 886
SICI:: 0004-6361(200011)363:3<869:AOTCMD>2.0.ZU;2-I
Fonte:: ISI
Lingua:: ENG
Soggetto:: INFRARED SURFACE PHOTOMETRY; EARLY-TYPE GALAXIES; STAR-FORMATION; NEARBY GALAXIES; GALACTIC-CENTER; GASEOUS DISKS; COLD DUST; EVIL EYE; GAS DISK; H-I;
Keywords:: galaxies : individual : NGC 3593; galaxies : ISM; galaxies : kinematics and dynamics; galaxies : spiral; galaxies : evolution; galaxies : starburst;
Tipo documento:: Article
Natura:: Periodico
Settore Disciplinare:: Physical, Chemical & Earth Sciences
Citazioni:: 59
Recensione:
Indirizzi per estratti:: Indirizzo: Garcia-Burillo, S Observ Astron Nacl, IGN, Apartado 1143, Alcala De Henares 28800, Madrid, Spain Observ Astron Nacl Apartado 1143 Alcala De Henares Madrid Spain 28800



Citazione:: S. Garcia-Burillo et al., "Anatomy of the counterrotating molecular disk in the spiral NGC 3593 (CO)-C-12(1-0) interferometer observations and numerical simulations", ASTRON ASTR, 363(3), 2000, pp. 869-886

Abstract

This paper presents high-resolution (4 " x3 ") interferometer observationsof the inner disk of the starburst spiral NGC 3593, made in the (1-0) lineof (CO)-C-12. NGC 3593 is an early-type system known to possess two counterrotating stellar disks of markedly different scale lengths and masses. TheCO emission comes from a highly structured molecular gas disk of M-gas similar to 3 x 10(8) M., and total radial extent r similar to 35 ". The observed CO kinematics indicates that the molecular gas is counterrotating at allradii with respect to the most massive stellar disk (disk I). The bulk of the CO emission arises from a ringed circumnuclear disk (CND) of radius r similar to 10 " and mass M-gas similar to 1.5 x 10(8) M., whichhosts a nuclear starburst. The link between the starburst and the CND is corroborated by high-resolution observations of other star formation tracers(H alpha, Pa alpha and J - K color index maps). The starburst episode is fueling the less massive counterrotating stellar disk (disk II). We find extinctions A(V) of similar to 1 mag in the CND based on optical and near-infrared recombination lines, but find > 5 mag from the CO and 100 mum fluxes. Out of the CND, molecular gas is distributed in a one-arm spiral feature which winds up tightly from the edges of the CND (r similar to 10 ") up to rsimilar to 35 ". The CO one-arm spiral is leading with respect to the gas flow in the southern half of the disk. There is a secondary trailing spiralare in the northern half The analysis of streaming motions linked with thepassage of the CO one-arm spiral indicates that the southern feature wouldbe a stationary m = 1 instability (pattern speed Omega (p) similar to 0). To account for the observed gas response in the disk of NGC 3593, we have run self-consistent numerical simulations, including the stellar and the gaseous components, in a physical scenario which approximates this case of study. We discuss the rapidly changing response of the disk, which evolves from a transitory regime, in which all instabilities are m = 1 waves leading with respect to the counterrotating gas, towards a stationary regime, in which m = 1 are mixed with m = 2 features, trailing with respect to the gas flow at all radii. In the light of the present simulations, NGC 3593 might be starting to change from the transitory towards the stationary regime.

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Documento generato il 19/06/13 alle ore 07:27:01