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Shocked Superwinds from the z~2 Clumpy Star-forming Galaxy, ZC406690 | | Sarah F. Newman
; Kristen Shapiro Griffin
; Reinhard Genzel
; Ric Davies
; Natascha M. Foerster-Schreiber
; Linda J. Tacconi
; Jaron Kurk
; Stijn Wuyts
; Shy Genel
; Simon J. Lilly
; Alvio Renzini
; Nicolas Bouche
; Andreas Burkert
; Giovanni Cresci
; Peter Buschkamp
; C. Marcella Corollo
; Frank Eisenhauer
; Erin Hicks
; Dieter Lutz
; Chiara Mancini
; Thorsten Naab
; Yingjie Peng
; Daniela Vergani
; | | Date: |
20 Apr 2012 | | Abstract: | We have obtained high-resolution data of the z 2 ring-like, clumpy
star-forming galaxy (SFG) ZC406690 using the VLT/SINFONI with AO (in K-band)
and in seeing-limited mode (in H- and J-band). Our data includes all of the
main strong optical emission lines: [OII], [OIII], Ha, Hb, [NII] and [SII]. We
find broad, blueshifted Ha and [OIII] emission line wings in the spectra of the
galaxy’s massive, star-forming clumps (sigma sim 85 km s^-1) and even broader
wings (up to 70% of the total Ha flux, with sigma sim 290 km s^-1) in regions
spatially offset from the clumps by sim 2 kpc. The broad emission likely
originates from large-scale outflows with mass outflow rates from individual
clumps that are 1-8x the SFR of the clumps. Based on emission line ratio
diagnostics ([NII]/Ha and [SII]/Ha) and photoionization and shock models, we
find that the emission from the clumps is due to a combination of
photoionization from the star-forming regions and shocks generated in the
outflowing component, with 5-30% of the emission deriving from shocks. In terms
of the ionization parameter (6x10^7-10^8 cm/s, based on both the SFR and the
O32 ratio), density (local electron densities of 300-1800 cm^-3 in and around
the clumps, and ionized gas column densities of 1200-8000 Msol/pc^2), and SFR
(10-40 Msol/yr), these clumps more closely resemble nuclear starburst regions
of local ULIRGs and dwarf irregulars than HII regions in local galaxies.
However, the star-forming clumps are not located in the nucleus as in local
starburst galaxies but instead are situated in a ring several kpc from the
center of their high-redshift host galaxy, and have an overall disk-like
morphology. The two brightest clumps are quite different in terms of their
internal properties, energetics and relative ages, and thus we are given a
glimpse at two different stages in the formation and evolution of rapidly
star-forming giant clumps at high-z. | | Source: | arXiv, 1204.4727 | | Services: | Forum | Review | PDF | Favorites | |
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