SIMBAD references

2018MNRAS.474..522O - Mon. Not. R. Astron. Soc., 474, 522-535 (2018/February-2)

The connection between the peaks in velocity dispersion and star-forming clumps of turbulent galaxies.

OLIVA-ALTAMIRANO P., FISHER D.B., GLAZEBROOK K., WISNIOSKI E., BEKIARIS G., BASSETT R., OBRESCHKOW D. and ABRAHAM R.

Abstract (from CDS):

We present Keck/OSIRIS (OH Suppressing Infrared Imaging Spectrograph) adaptive optics observations with 150-400 pc spatial sampling of seven turbulent, clumpy disc galaxies from the DYnamics of Newly-Assembled Massive Objects (DYNAMO) sample (0.07 < z < 0.2). DYNAMO galaxies have previously been shown to be well matched in properties to main-sequence galaxies at z ∼ 1.5. Integral field spectroscopy observations using adaptive optics are subject to a number of systematics including a variable point spread function and spatial sampling, which we account for in our analysis. We present gas velocity dispersion maps corrected for these effects, and confirm that DYNAMO galaxies do have high gas velocity dispersion (σ = 40-80 km s–1), even at high spatial sampling. We find statistically significant structure in six out of seven galaxies. The most common distance between the peaks in velocity dispersion (σpeaks) and emission line peaks is ∼0.5 kpc; we note this is very similar to the average size of a clump measured with Hubble Space Telescope H α maps. This could suggest that σpeaks in clumpy galaxies likely arise due to some interaction between the clump and the surrounding interstellar medium of the galaxy, though our observations cannot distinguish between outflows, inflows or velocity shear. Observations covering a wider area of the galaxies will be needed to confirm this result.

Abstract Copyright: © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: general - galaxies: high-redshift - galaxies: kinematics and dynamics - galaxies: star formation - galaxies: structure

Simbad objects: 7

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