AEGIS: Infrared Spectroscopy of an Infrared-luminous Lyman Break Galaxy at z = 3.01 | Zendy

Jiasheng Huang | Zendy; D. Rigopoulou | Zendy; Casey Papovich | Zendy; M. L. N. Ashby | Zendy; S. P. Willner | Zendy; R. J. Ivison | Zendy; E. S. Laird | Zendy; Tracy Webb | Zendy; G. Wilson | Zendy; P. Barmby | Zendy; S. C. Chapman | Zendy; Christopher J. Conselice | Zendy; B. A. McLeod | Zendy; C. G. Shu | Zendy; H. A. Smith | Zendy; E. Le Floc’h | Zendy; Eiichi Egami | Zendy; Christopher Willmer | Zendy; G. G. Fazio | Zendy

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AEGIS: Infrared Spectroscopy of an Infrared-luminous Lyman Break Galaxy at z = 3.01

Author(s) -

Jiasheng Huang,

D. Rigopoulou,

Casey Papovich,

M. L. N. Ashby,

S. P. Willner,

R. J. Ivison,

E. S. Laird,

Tracy Webb,

G. Wilson,

P. Barmby,

S. C. Chapman,

Christopher J. Conselice,

B. A. McLeod,

C. G. Shu,

H. A. Smith,

E. Le Floc’h,

Eiichi Egami,

Christopher Willmer,

G. G. Fazio

Publication year - 2006

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 - 10.1086/508567

Subject(s) - astrophysics , physics , infrared , galaxy , luminosity , redshift , star formation , luminous infrared galaxy , spectroscopy , astronomy , emission spectrum , spectral line

We report the detection of rest-frame 6.2 and 7.7 μm emission features arising from polycyclic aromatic hydrocarbons (PAHs) in the Spitzer IRS spectrum of an infrared-luminous Lyman break galaxy at z = 3.01. This is currently the highest redshift galaxy where these PAH emission features have been detected. The total IR luminosity inferred from the MIPS 24 μm and radio flux density is 2 × 1013 L⊙, which qualifies this object as a so-called hyperluminous infrared galaxy (HyLIRG). However, unlike local HyLIRGs, which are generally associated with QSO/AGNs and have weak or absent PAH emission features, this HyLIRG has very strong 6.2 and 7.7 μm PAH emission. We argue that intense star formation dominates the IR emission of this source, although we cannot rule out the presence of a deeply obscured AGN. This LBG appears to be a distorted system in the HST ACS F606W and F814W images, possibly indicating that a significant merger or interaction is driving the large IR luminosity. © 2007. The American Astronomical Society. All rights reserved.

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