%0 Generic %1 barnes2014lyman %A Barnes, Luke A. %A Garel, Thibault %A Kacprzak, Glenn G. %D 2014 %K absorption cgm lya mgii %T Lyman Alpha and MgII as Probes of Galaxies and their Environments %U http://arxiv.org/abs/1409.6320 %X Ly\alpha emission, Ly\alpha absorption and MgII absorption are powerful tracers of neutral hydrogen. Hydrogen is the most abundant element in the universe and plays a central role in galaxy formation via gas accretion and outflows, as well as being the precursor to molecular clouds, the sites of star formation. Since 21cm emission from neutral hydrogen can only be directly observed in the local universe, we rely on Ly\alpha emission, and Ly\alpha and MgII absorption to probe the physics that drives galaxy evolution at higher redshifts. Furthermore, these tracers are sensitive to a range of hydrogen densities that cover the interstellar medium, the circumgalactic medium and the intergalactic medium, providing an invaluable means of studying gas physics in regimes where it is poorly understood. At high redshift, Ly\alpha emission line searches have discovered thousands of star-forming galaxies out to z = 7. The large Ly\alpha scattering cross-section makes observations of this line sensitive to even very diffuse gas outside of galaxies. Several thousand more high-redshift galaxies are known from damped Ly\alpha absorption lines and absorption by the MgII doublet in quasar and GRB spectra. MgII, in particular, probes metal-enriched neutral gas inside galaxy haloes in a wide range of environments and redshifts (0.1 < z < 6.3), including the so-called redshift desert. Here we review what observations and theoretical models of Ly\alpha emission, Ly\alpha and MgII absorption have told us about the interstellar, circumgalactic and intergalactic medium in the context of galaxy formation and evolution.

@misc{barnes2014lyman, abstract = {Ly{\alpha} emission, Ly{\alpha} absorption and MgII absorption are powerful tracers of neutral hydrogen. Hydrogen is the most abundant element in the universe and plays a central role in galaxy formation via gas accretion and outflows, as well as being the precursor to molecular clouds, the sites of star formation. Since 21cm emission from neutral hydrogen can only be directly observed in the local universe, we rely on Ly{\alpha} emission, and Ly{\alpha} and MgII absorption to probe the physics that drives galaxy evolution at higher redshifts. Furthermore, these tracers are sensitive to a range of hydrogen densities that cover the interstellar medium, the circumgalactic medium and the intergalactic medium, providing an invaluable means of studying gas physics in regimes where it is poorly understood. At high redshift, Ly{\alpha} emission line searches have discovered thousands of star-forming galaxies out to z = 7. The large Ly{\alpha} scattering cross-section makes observations of this line sensitive to even very diffuse gas outside of galaxies. Several thousand more high-redshift galaxies are known from damped Ly{\alpha} absorption lines and absorption by the MgII doublet in quasar and GRB spectra. MgII, in particular, probes metal-enriched neutral gas inside galaxy haloes in a wide range of environments and redshifts (0.1 < z < 6.3), including the so-called redshift desert. Here we review what observations and theoretical models of Ly{\alpha} emission, Ly{\alpha} and MgII absorption have told us about the interstellar, circumgalactic and intergalactic medium in the context of galaxy formation and evolution.}, added-at = {2014-09-24T10:05:13.000+0200}, author = {Barnes, Luke A. and Garel, Thibault and Kacprzak, Glenn G.}, biburl = {https://www.bibsonomy.org/bibtex/29c58c7438708d60e1321697712ec84ec/miki}, description = {[1409.6320] Lyman Alpha and MgII as Probes of Galaxies and their Environments}, interhash = {090cf928a0a73ab516cb814ee106fe50}, intrahash = {9c58c7438708d60e1321697712ec84ec}, keywords = {absorption cgm lya mgii}, note = {cite arxiv:1409.6320Comment: 59 Pages, 19 Figures, 1 Table. Accepted for publication in Publications of the Astronomical Society of the Pacific}, timestamp = {2014-09-24T10:05:13.000+0200}, title = {Lyman Alpha and MgII as Probes of Galaxies and their Environments}, url = {http://arxiv.org/abs/1409.6320}, year = 2014 }