We report the discovery of Serenity-18, a galaxy at z similar or equal to 5.939 for which we could measure the content of molecular gas, M(H-2) similar or equal to 5 x 10(9) M-circle dot, traced by the CO(6-5) emission, together with the metal-poor ([Fe/H] - 3.08 +/- 0.12, [Si/H] = -2.86 +/- 0.14) gas clump/filament which is possibly feeding its growth. The galaxy has an estimated star formation rate of approximate to 100 M-circle dot yr(-1), implying that it is a typical main sequence galaxy at these redshifts. The metal-poor gas is detected through a damped Ly alpha absorber (DLA) observed at a spatial separation of 40 kpc and at the same redshift of Serenity-18, along the line of sight to the quasar SDSS J2310+1855 (z(em) similar or equal to 6.0025). The chemical abundances measured for the damped Ly alpha system are in very good agreement with those measured for other DLAs discovered at similar redshifts, indicating an enrichment due to massive PopII stars. The galaxy/damped system that we discovered is a direct observational evidence of the assembly of a galaxy at the edge of the reionization epoch.
Witnessing Galaxy Assembly at the Edge of the Reionization Epoch / D'Odorico, V.; Feruglio, C.; Ferrara, A.; Gallerani, S.; Pallottini, A.; Carniani, S.; Maiolino, R.; Cristiani, S.; Marconi, A.; Piconcelli, E.; Fiore, F.. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - ELETTRONICO. - 863:(2018), pp. L29-0. [10.3847/2041-8213/aad7b7]
Witnessing Galaxy Assembly at the Edge of the Reionization Epoch
Carniani, S.;Marconi, A.;
2018
Abstract
We report the discovery of Serenity-18, a galaxy at z similar or equal to 5.939 for which we could measure the content of molecular gas, M(H-2) similar or equal to 5 x 10(9) M-circle dot, traced by the CO(6-5) emission, together with the metal-poor ([Fe/H] - 3.08 +/- 0.12, [Si/H] = -2.86 +/- 0.14) gas clump/filament which is possibly feeding its growth. The galaxy has an estimated star formation rate of approximate to 100 M-circle dot yr(-1), implying that it is a typical main sequence galaxy at these redshifts. The metal-poor gas is detected through a damped Ly alpha absorber (DLA) observed at a spatial separation of 40 kpc and at the same redshift of Serenity-18, along the line of sight to the quasar SDSS J2310+1855 (z(em) similar or equal to 6.0025). The chemical abundances measured for the damped Ly alpha system are in very good agreement with those measured for other DLAs discovered at similar redshifts, indicating an enrichment due to massive PopII stars. The galaxy/damped system that we discovered is a direct observational evidence of the assembly of a galaxy at the edge of the reionization epoch.
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