%0 Generic %1 caminha2015discovery %A Caminha, G. B. %A Karman, W. %A Rosati, P. %A Caputi, K. I. %A Battaia, F. Arrigoni %A Balestra, I. %A Grillo, C. %A Mercurio, A. %A Nonino, M. %A Vanzella, E. %D 2015 %K Lya blob cgm emission muse %T Discovery of a faint star-forming multiply lensed Lyman-alpha blob %U http://arxiv.org/abs/1512.05655 %X We report the discovery of a multiply lensed Lyman-$\alpha$ blob (LAB) behind the galaxy cluster AS1063 using the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope. The background source is at $z=$ 3.117 and is intrinsically faint compared to almost all previously reported LABs. We used our highly precise strong lensing model to reconstruct the source properties finding a luminosity of $L_Ly\alpha$=$1.9\times10^42$ erg s$^-1$, extending to 33 kpc. We find that the LAB is associated with a group of galaxies, and possibly a protocluster, in keeping with previous studies that find LABs in overdensities. In addition to Ly$\alpha$ emission, we find CIV, HeII, and OIII UV emission lines arising from the centre of the nebula. We used the compactness of these lines in combination with the line ratios to conclude that the Ly$\alpha$ nebula is likely powered by embedded star formation. Resonant scattering of the Ly$\alpha$ photons then produces the extended shape of the emission. Thanks to the combined power of MUSE and strong gravitational lensing, we are now able to probe the circumgalatic medium of sub-$L_*$ galaxies at $z3$

@misc{caminha2015discovery, abstract = {We report the discovery of a multiply lensed Lyman-$\alpha$ blob (LAB) behind the galaxy cluster AS1063 using the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope. The background source is at $z=$ 3.117 and is intrinsically faint compared to almost all previously reported LABs. We used our highly precise strong lensing model to reconstruct the source properties finding a luminosity of $L_{\rm Ly\alpha}$=$1.9\times10^{42}$ erg s$^{-1}$, extending to 33 kpc. We find that the LAB is associated with a group of galaxies, and possibly a protocluster, in keeping with previous studies that find LABs in overdensities. In addition to Ly$\alpha$ emission, we find CIV, HeII, and OIII] UV emission lines arising from the centre of the nebula. We used the compactness of these lines in combination with the line ratios to conclude that the Ly$\alpha$ nebula is likely powered by embedded star formation. Resonant scattering of the Ly$\alpha$ photons then produces the extended shape of the emission. Thanks to the combined power of MUSE and strong gravitational lensing, we are now able to probe the circumgalatic medium of sub-$L_{*}$ galaxies at $z\approx 3$}, added-at = {2015-12-18T09:27:45.000+0100}, author = {Caminha, G. B. and Karman, W. and Rosati, P. and Caputi, K. I. and Battaia, F. Arrigoni and Balestra, I. and Grillo, C. and Mercurio, A. and Nonino, M. and Vanzella, E.}, biburl = {https://www.bibsonomy.org/bibtex/25326c730542c00cca0df7462a3c066fc/miki}, description = {[1512.05655] Discovery of a faint star-forming multiply lensed Lyman-alpha blob}, interhash = {621657c40680d6cfeb1fead295654b0c}, intrahash = {5326c730542c00cca0df7462a3c066fc}, keywords = {Lya blob cgm emission muse}, note = {cite arxiv:1512.05655Comment: 4 pages, 5 figures, submitted to A&A}, timestamp = {2015-12-18T09:27:45.000+0100}, title = {Discovery of a faint star-forming multiply lensed Lyman-alpha blob}, url = {http://arxiv.org/abs/1512.05655}, year = 2015 }