A search for H$\alpha$ emission in high-metallicity damped Lyman-$\alpha$ systems at $z\sim 2.4$

Abstract

We report on a sensitive search for redshifted H$\alpha$ line-emission from three high-metallicity damped Ly$\alpha$ absorbers (DLAs) at $z\approx 2.4$ with the Near-infrared Integral Field Spectrometer (NIFS) on the Gemini-North telescope, assisted by the ALTtitude conjugate Adaptive optics for the InfraRed (ALTAIR) system with a laser guide star. Within the NIFS field-of-view, $\approx 3.22"\times 2.92"$ corresponding to $\approx 25$ kpc $\times 23$ kpc at $z=2.4$, we detect no statistically significant line-emission at the expected redshifted H$\alpha$ wavelengths. The measured root-mean-square noise fluctuations in $0.4"$ apertures are $1-3\times 10^{-18}$ erg s${}^{-1}$ cm${}^{-2}$. Our analysis of simulated, compact, line-emitting sources yields stringent limits on the star-formation rates (SFRs) of the three DLAs, $<2.2$~M${}_{\odot }$ yr${}^{-1}$ ($3\sigma$) for two absorbers, and $<11$~M${}_{\odot }$ yr${}^{-1}$ ($3\sigma$) for the third, at all impact parameters within $\approx 12.5$~kpc to the quasar sightline at the DLA redshift. For the third absorber, the SFR limit is $<4.4$~M${}_{\odot }$ yr${}^{-1}$ for locations away from the quasar sightline. These results demonstrate the potential of adaptive optics-assisted, integral field unit searches for galaxies associated with high-$z$ DLAs.

8 pages, 3 figures; accepted for publication in MNRAS

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