Mostrar el registro sencillo del ítem

dc.contributor.authorGuillard, P.
dc.contributor.authorBoulanger, F.
dc.contributor.authorPineau des Forêts, G.
dc.contributor.authorFalgarone, E.
dc.contributor.authorGusdorf, A.
dc.contributor.authorCluver, M. E.
dc.contributor.authorAppleton, P. N.
dc.contributor.authorLisenfeld , Ute 
dc.contributor.authorDuc, P.-A.
dc.contributor.authorOgle, P. M.
dc.contributor.authorXu, C. K.
dc.date.accessioned2013-10-08T11:02:18Z
dc.date.available2013-10-08T11:02:18Z
dc.date.issued2012
dc.identifier.citationGuillard, P. Turbulent molecular gas and star formation in the shocked intergalactic medium of Stephan's Quintet. Astrophysical Journal, 749(2): 158 (2012). [http://hdl.handle.net/10481/28359]es_ES
dc.identifier.issn004-637X
dc.identifier.issn1538-4357
dc.identifier.otherdoi: 10.1088/0004-637X/749/2/158
dc.identifier.otherarXiv:1202.2862v2
dc.identifier.urihttp://hdl.handle.net/10481/28359
dc.description.abstractWe report on single-dish radio CO observations towards the inter-galactic medium (IGM) of the Stephan's Quintet (SQ) group of galaxies. Extremely bright mid-IR H2 rotational line emission from warm molecular gas has been detected by Spitzer in the kpc-scale shock created by a galaxy collision. We detect in the IGM CO(1-0), (2-1) and (3-2) line emission with complex profiles, spanning a velocity range of 1000 km/s. The spectra exhibit the pre-shock recession velocities of the two colliding gas systems (5700 and 6700 km/s), but also intermediate velocities. This shows that much of the molecular gas has formed out of diffuse gas accelerated by the galaxy-tidal arm collision. A total H2 mass of 5x10^9 Msun is detected in the shock. The molecular gas carries a large fraction of the gas kinetic energy involved in the collision, meaning that this energy has not been thermalized yet. The turbulent kinetic energy of the H2 gas is at least a factor of 5 greater than the thermal energy of the hot plasma heated by the collision. The ratio between the warm H2 mass derived from Spitzer IRS spectroscopy and the H2 mass derived from CO fluxes is ~0.3 in the IGM of SQ, which is 10-100 times higher than in star-forming galaxies. In the shocked region, the ratio of the PAH-to-CO surface luminosities, commonly used to measure the star formation efficiency of the H2 gas, is lower (up to a factor 75) than the observed values in star-forming galaxies. We suggest that turbulence fed by the galaxy-tidal arm collision maintains a high heating rate within the H2 gas. This interpretation implies that the velocity dispersion on the scale of giant molecular clouds in SQ is one order of magnitude larger than the Galactic value. The high amplitude of turbulence may explain why this gas is not forming stars efficiently. [abridged version]es_ES
dc.description.sponsorshipIRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). PG also would like to acknowledge in particular the IRAM staff for help provided during the observations. UL acknowledges support by the research project AYA2007-67625-C02-02 from the Spanish Ministerio de Ciencia y Educación and the Junta de Andalucía (Spain) grant FQM-0108.es_ES
dc.language.isoenges_ES
dc.publisherAmerican Astronomical Society; Institute of Physicses_ES
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs 3.0 Licensees_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es_ES
dc.subjectGalaxies es_ES
dc.subjectClusterses_ES
dc.subjectStephan's Quintetes_ES
dc.subjectInteractionses_ES
dc.subjectISMes_ES
dc.subjectIntergalactic mediumes_ES
dc.titleTurbulent molecular gas and star formation in the shocked intergalactic medium of Stephan's Quintetes_ES
dc.typeinfo:eu-repo/semantics/preprintes_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES


Ficheros en el ítem

[PDF]

Este ítem aparece en la(s) siguiente(s) colección(ones)

Mostrar el registro sencillo del ítem

Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Excepto si se señala otra cosa, la licencia del ítem se describe como Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License