2015. cite arxiv:1501.01215Comment: 20 pages, 13 figures, submitted to MNRAS

Paper abstract bibtex

Paper abstract bibtex

We present a survey of Ly$\alpha$ emitting galaxies in the fields of the VLT LBG Redshift Survey, incorporating the analysis of narrow band number counts, the rest frame UV luminosity function and the two-point correlation function of Ly$\alpha$ emitters at $z\approx3.1$. Our photometric sample consists of 750 LAE candidates, over an area of 1.07 deg$^2$, with estimated equivalent widths of $\gtrsim65$ \AA, from 5 fields based on deep Subaru Suprime-Cam imaging data. Added to this we have obtained spectroscopic follow-up observations, which successfully detected Ly$\alpha$ emission in 35 galaxies. Based on the spectroscopic results, we refined our photometric selection constraints, with the resulting sample having a success rate of $78\pm18%$. We calculate the narrow band number counts for our photometric sample and find these to be consistent with previous studies of LAEs at this redshift. We find the $R$-band continuum luminosity function to be $\sim10\times$ lower than the equivalent luminosity function of LBGs at this redshift. The results are consistent with the LAE fraction of the LBG population being constant or marginally increasing to fainter magnitudes at $R<26$. Finally, we calculate the LAE auto-correlation function and find a low clustering amplitude compared to the $z\sim3$ LBG population. We calculate a clustering length of $2.87\pm0.70~h^{-1}{m̊ Mpc}$, which corresponds to a clustering bias of $b=2.13\pm0.47$ and a median halo mass of $M_{m̊ DM}=10^{11.0\pm0.6}~h^{-1}~{m̊ M_\odot}$. Overall, we conclude that LAEs inhabit primarily low mass halos, but are a relatively small component of the galaxy population found in such halos.

@misc{bielby2015redshift, abstract = {We present a survey of Ly$\alpha$ emitting galaxies in the fields of the VLT LBG Redshift Survey, incorporating the analysis of narrow band number counts, the rest frame UV luminosity function and the two-point correlation function of Ly$\alpha$ emitters at $z\approx3.1$. Our photometric sample consists of 750 LAE candidates, over an area of 1.07 deg$^2$, with estimated equivalent widths of $\gtrsim65$ \AA, from 5 fields based on deep Subaru Suprime-Cam imaging data. Added to this we have obtained spectroscopic follow-up observations, which successfully detected Ly$\alpha$ emission in 35 galaxies. Based on the spectroscopic results, we refined our photometric selection constraints, with the resulting sample having a success rate of $78\pm18\%$. We calculate the narrow band number counts for our photometric sample and find these to be consistent with previous studies of LAEs at this redshift. We find the $R$-band continuum luminosity function to be $\sim10\times$ lower than the equivalent luminosity function of LBGs at this redshift. The results are consistent with the LAE fraction of the LBG population being constant or marginally increasing to fainter magnitudes at $R<26$. Finally, we calculate the LAE auto-correlation function and find a low clustering amplitude compared to the $z\sim3$ LBG population. We calculate a clustering length of $2.87\pm0.70~h^{-1}{\rm Mpc}$, which corresponds to a clustering bias of $b=2.13\pm0.47$ and a median halo mass of $M_{\rm DM}=10^{11.0\pm0.6}~h^{-1}~{\rm M_\odot}$. Overall, we conclude that LAEs inhabit primarily low mass halos, but are a relatively small component of the galaxy population found in such halos.}, author = {Bielby, R. M. and Tummuangpak, P. and Shanks, T. and Francke, H. and Crighton, N. H. M. and Bañados, E. and González-López, Jorge and Infante, L. and Orsi, A.}, interhash = {37ca8058a1b59f3e08cc7f8137e8c99f}, intrahash = {82275e8a6b60eb69aec09f558663b18a}, note = {cite arxiv:1501.01215Comment: 20 pages, 13 figures, submitted to MNRAS}, title = {The VLT LBG Redshift Survey - V. Characterising the z = 3.1 Lyman Alpha Emitter Population}, url = {http://arxiv.org/abs/1501.01215}, year = 2015 }

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