Publication
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
Author
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.
Language
English
Source (journal)
The astrophysical journal. - Chicago, Ill., 1895, currens
Publication
Chicago, Ill. : 2012
ISSN
0004-637X [print]
1538-4357 [online]
Volume/pages
760:2(2012), p. 1-10
Article Reference
130
ISI
000311217000034
Medium
E-only publicatie
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 04.02.2013
Last edited 16.08.2017
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