Complex gas kinematics in compact, rapidly assembling star-forming galaxies

dc.creatorAmorín, R.
dc.creatorVílchez, J. M.
dc.creatorHägele, Guillermo Federico
dc.creatorFirpo, Verónica
dc.creatorPérez-Montero, E.
dc.creatorPapaderos, P.
dc.date2012
dc.date2019-11-04T12:31:19Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/84688
dc.identifierissn:2041-8205
dc.descriptionDeep, high-resolution spectroscopic observations have been obtained for six compact, strongly star-forming galaxies at redshift z 0.1-0.3, most of them also known as green peas. Remarkably, these galaxies show complex emission-line profiles in the spectral region including Hα, [NII]λλ6548, 6584Å, and [SII]λλ6717, 6731Å, consisting of the superposition of different kinematical components on a spatial extent of few kiloparsecs: a very broad line emission underlying more than one narrower component. For at least two of the observed galaxies some of these multiple components are resolved spatially in their two-dimensional spectra, whereas for another one a faint detached Hα blob lacking stellar continuum is detected at the same recessional velocity ∼ 7kpc away from the galaxy. The individual narrower Hα components show high intrinsic velocity dispersion (σ ∼30-80kms<sup>-1</sup>), suggesting together with unsharped masking Hubble Space Telescope images that star formation proceeds in an ensemble of several compact and turbulent clumps, with relative velocities of up to ∼500kms<sup>-1</sup>. The broad underlying Hα components indicate in all cases large expansion velocities (full width zero intensity ≥1000kms<sup>-1</sup>) and very high luminosities (up to ∼10<sup>42</sup> erg s<sup>-1</sup>), probably showing the imprint of energetic outflows from supernovae. These intriguing results underline the importance of green peas for studying the assembly of low-mass galaxies near and far.
dc.descriptionFacultad de Ciencias Astronómicas y Geofísicas
dc.formatapplication/pdf
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rightsCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.subjectCiencias Astronómicas
dc.subjectgalaxies: dwarf
dc.subjectgalaxies: evolution
dc.subjectgalaxies: kinematics and dynamics
dc.subjectgalaxies: starburst
dc.titleComplex gas kinematics in compact, rapidly assembling star-forming galaxies
dc.typeArticulo
dc.typeArticulo


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