Résumé / Abstract Journal-club_Galaxies

Journal-club Galaxies

« The atomic Hydrogen content of galaxies at z = 0.75 - 1.45 »

Aditya Chowdhury
Tata Inst. Fundamental Research (TIFR) (Mumbai, Inde)

Atomic gas is a key component that impacts galaxy formation and evolution over cosmic time. A number of galaxy redshift surveys have firmly established that star formation in galaxies peaks at z~1-3, with the cosmic star formation rate density being an order of magnitude higher than in the local universe. However little is known about the neutral gas content (i.e. the fuel for the star formation) of these galaxies at this epoch. We have used the upgraded Giant Metrewave Radio Telescope (GMRT) to conduct a deep (~100 hour) search for the redshifted HI 21cm emission from galaxies at z = 0.75-1.45 over a 2 deg^2 region of the DEEP2 survey fields. We have detected the HI 21cm line emission from z~1, by stacking ~ 7200 star-forming galaxies in the surveyed fields. This has allowed us to measure the average atomic gas mass and average atomic gas depletion time of star-forming galaxies at and just after the epoch of galaxy assembly.
jeudi 5 septembre 2019 - 11:30
Salle 281, Institut d'Astrophysique
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