Title
The properties of the star-forming interstellar medium at z=0.8-2.2 from HiZELS : star formation and clump scaling laws in gas-rich, turbulent disks The properties of the star-forming interstellar medium at z=0.8-2.2 from HiZELS : star formation and clump scaling laws in gas-rich, turbulent disks
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Chicago, Ill. ,
Subject
Physics
Source (journal)
The astrophysical journal. - Chicago, Ill., 1895, currens
Volume/pages
760(2012) :2 , p. 1-10
ISSN
0004-637X
1538-4357
Article Reference
130
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We present adaptive optics assisted integral field spectroscopy of nine Ha-selected galaxies at z = 0.84-2.23 drawn from the HiZELS narrowband survey. Our observations map the kinematics of these star-forming galaxies on similar to kpc scales. We demonstrate that within the interstellar medium of these galaxies, the velocity dispersion of the star-forming gas (sigma) follows a scaling relation sigma alpha Sigma(1/n)(SFR) constant (where Sigma(SFR) is the star formation surface density and the constant includes the stellar surface density). Assuming the disks are marginally stable (Toomre Q = 1), this follows from the Kennicutt-Schmidt relation (Sigma(SFR) = A Sigma(n)(gas)), and we derive best-fit parameters of n = 1.34 +/- 0.15 and A = 3.4(-1.6)(+2.5) x 10(-4) M-circle dot yr(-1) kpc(-2), consistent with the local relation, and implying cold molecular gas masses of M-gas = 10(9-10) M-circle dot and molecular gas fractions of M-gas/(M-gas + M-star) = 0.3 +/- 0.1, with a range of 10%-75%. We also identify 11 similar to kpc-scale star-forming regions (clumps) within our sample and show that their sizes are comparable to the wavelength of the fastest growing mode. The luminosities and velocity dispersions of these clumps follow the same scaling relations as local H II regions, although their star formation densities are a factor similar to 15 +/- 5 x higher than typically found locally. We discuss how the clump properties are related to the disk, and show that their high masses and luminosities are a consequence of the high disk surface density.
E-info
https://repository.uantwerpen.be/docman/iruaauth/bf8be5/a913545.pdf
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