A Luminous Lyα‐emitting Galaxy at Redshiftz= 6.535: Discovery and Spectroscopic Confirmation | Zendy

James E. Rhoads | Zendy; Chun Xu | Zendy; Steve Dawson | Zendy; Arjun Dey | Zendy; Sangeeta Malhotra | Zendy; Junxian Wang | Zendy; Buell T. Jannuzi | Zendy; Hyron Spinrad | Zendy; Daniel Stern | Zendy

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A Luminous Lyα‐emitting Galaxy at Redshiftz= 6.535: Discovery and Spectroscopic Confirmation

Author(s) -

James E. Rhoads,

Chun Xu,

Steve Dawson,

Arjun Dey,

Sangeeta Malhotra,

Junxian Wang,

Buell T. Jannuzi,

Hyron Spinrad,

Daniel Stern

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/422094

Subject(s) - physics , astrophysics , redshift , galaxy , equivalent width , doubly ionized oxygen , luminosity , emission spectrum , line (geometry) , astronomy , flux (metallurgy) , spectral line , geometry , mathematics , materials science , metallurgy

We present a redshift z=6.535 galaxy discovered by its Lyman alpha emissionin a 9180A narrowband image from the Large Area Lyman Alpha (LALA) survey. TheLy-a line luminosity (1.1e43 erg/s) is among the largest known for star forminggalaxies at z=6.5. The line shows the distinct asymmetry that is characteristicof high-redshift Ly-a. The 2 sigma lower bound on the observer-frame equivalentwidth is > 530A. This is hard to reconcile with a neutral intergalactic mediumunless the Ly-a line is intrinsically strong and is emitted from its hostgalaxy with an intrinsic Doppler shift of several hundred km/s. If the IGM isionized, it corresponds to a rest frame equivalent width > 40A after correctingfor Ly-a forest absorption. We also present complete spectroscopic followup of the remaining candidateswith line flux > 2e-17 erg/cm2/s in our 1200 square arcminute narrowband image.These include another galaxy with a strong emission line at 9136A and nodetected continuum flux, which however is most likely an [OIII] source atz=0.824 based on a weak detection of the [OIII] 4959A line.Comment: Revised version, accepted to The Astrophysical Journal, 22 April 2004 (original version submitted 27 February 2004

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