Signatures of Cool Gas Fueling a Star-Forming Galaxy at Redshift 2.3

(2) Swinburne; (3) LAM Marseille; (4) UCSB; (5) Geneva); C. Martin (4); C. P\'eroux (3); G. G. Kacprzak (2); M. Dessauges-Zavadsky (5) ((1) IRAP; M. T. Murphy (2); N. Bouch\'e (1)

Signatures of Cool Gas Fueling a Star-Forming Galaxy at Redshift 2.3

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arxiv 1306.0134 v2 pith:YTXI6S3Q submitted 2013-06-01 astro-ph.CO

Signatures of Cool Gas Fueling a Star-Forming Galaxy at Redshift 2.3

N. Bouch\'e (1) , M. T. Murphy (2) , G. G. Kacprzak (2) , C. P\'eroux (3) , T. Contini (1) , C. Martin (4) , M. Dessauges-Zavadsky (5) ((1) IRAP , Toulouse

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(2) Swinburne (3) LAM Marseille (4) UCSB (5) Geneva)

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keywords galaxyaccretionsignaturesdistinctobservationsratestar-formationstar-forming

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Galaxies are thought to be fed by the continuous accretion of intergalactic gas, but direct observational evidence has been elusive. The accreted gas is expected to orbit about the galaxy's halo, delivering not just fuel for star-formation but also angular momentum to the galaxy, leading to distinct kinematic signatures. Here we report observations showing these distinct signatures near a typical distant star-forming galaxy where the gas is detected using a background quasar passing 26 kpc from the host. Our observations indicate that gas accretion plays a major role in galaxy growth since the estimated accretion rate is comparable to the star-formation rate.

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