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We study the impact of deviations from the Kennicutt-Schmidt relation (quantified by the `burstiness parameter $kappa_s$), gas metallicity ($Z$), and density ($n$) on the observed [OIII]88$mu$m/[CII]158$mu$m surface brightness ratios ($Sigma_{[OIII]}/Sigma_{[CII]}$) in nine galaxies at $zapprox6-9$. We first discuss possible biases in the measured $Sigma_{[OIII]}/Sigma_{[CII]}$ ratios by comparing the data with zoom-in cosmological simulations, and then use a Markov Chain Monte Carlo algorithm to derive the best fit values of ($kappa_s, Z, n$). We find that (i) the strongest dependence of $Sigma_{[OIII]}/Sigma_{[CII]}$ is on $kappa_s$; (ii) high ratios identify starburst galaxies with short gas depletion times ($t_{dep}=6-49,rm Myr$); (iii) a secondary dependence on density is found, with $Sigma_{[OIII]}/Sigma_{[CII]}$ anticorrelating with $n$ as a result of the lower [OIII] critical density, (iv) the ratio only weakly depends on $Z$. The nine galaxies are significantly enriched (Z=0.2-0.5 $Z_odot$), and dense ($n=10^{1-3} {rm cm}^{-3}$). This lends further support to the starburst scenario in which a rapid enrichment of the interstellar medium is expected.
We present observations with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope of five star-forming galaxies at redshifts z in the range 0.2993-0.4317 and with high emission-line flux ratios O32=[OIII]5007/[OII]3727 ~ 8-27 aiming to
ALMA observations have revealed that [CII] 158$mu$m line emission in high-z galaxies is ~2-3$times$ more extended than the UV continuum emission. Here we explore whether surface brightness dimming (SBD) of the [CII] line is responsible for the report
We present our new ALMA observations targeting [OIII]88um, [CII]158um, [NII]122um, and dust continuum emission for three Lyman break galaxies at z=6.0293-6.2037 identified in the Subaru/Hyper Suprime-Cam survey. We clearly detect [OIII] and [CII] lin
We are using the 2dF spectrograph to make a survey of all objects (`stars and `galaxies) in a 12 sq.deg region towards the Fornax cluster. We have discovered a population of compact emission-line galaxies unresolved on photographic sky survey plates
We present Large Binocular Telescope spectrophotometric observations of five low-redshift (z<0.070) compact star-forming galaxies (CSFGs) with extremely high emission-line ratios O32 = [OIII]5007/[OII]3727, ranging from 23 to 43. Galaxies with such h