High redshift Lya emitters: clues on the Milky Way infancy - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




High redshift Lya emitters: clues on the Milky Way infancy - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: With the aim of determining if Milky Way MW progenitors could be identifiedas high redshift Lyman Alpha Emitters LAEs we have derived the intrinsicproperties of z ~ 5.7 MW progenitors, which are then used to compute theirobserved Lyman-alpha luminosity, L alpha, and equivalent width, EW. MWprogenitors visible as LAEs are selected according to the canonicalobservational criterion, L alpha > 10^42 erg-s and EW > 20 A. Progenitors ofMW-like galaxies have L alpha = 10^39-43.25 erg-s, making some of themvisible as LAEs. In any single MW merger tree realization, typically only 1out of ~ 50 progenitor meets the LAE selection criterion, but the probabilityto have at least one LAE is very high, P = 68%. The identified LAE stars haveages, t * ~ 150-400 Myr at z ~ 5.7 with the exception of five small progenitorswith t * < 5 Myr and large EW = 60-130 A. LAE MW progenitors provide > 10% ofthe halo very metal-poor stars Fe-H < -2, thus establishing a potentiallyfruitful link between high-z galaxies and the Local Universe.



Author: S. Salvadori 1, P. Dayal 2, A. Ferrara 3 1 Kapteyn Astronomical Institute, Groningen, The Netherlands 2 SISSA-ISAS, Trieste, Ital

Source: https://arxiv.org/



DOWNLOAD PDF




Related documents