Spectroscopic Confirmation of an Extreme Starburst at Redshift 4.547

Capak, P.; Carilli, C. L.; Lee, N.; Aldcroft, Thomas L.; Aussel, H.; Schinnerer, E.; Wilson, Grant; Yun, Min S.; Blain, A. W.; Giavalisco, Mauro; Ilbert, O.; Kartaltepe, Jeyhan S.; Lee, K.-S.; McCracken, H. J.; Mobasher, Bahram; Salvato, M.; Sasaki, S.; Scott, K. S.; Sheth, Kartik; Shioya, Yasuhiro; Thompson, D. J.; Elvis, M.; Sanders, D. B.; Scoville, N. Z.; Tanaguchi, Y.

doi:10.1086/590555

Cited by 137 publications

(222 citation statements)

References 38 publications

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“…The discrepancy is most certainly due to the different strategy in analyzing photometric redshifts (including lower limits and choosing higher-redshift phot-z solutions) but it could also be due in part to cosmic variance, where the COSMOS field is known to have several notable, very distant DSFGs at z > 4.5 (e.g. Capak et al, 2008;Riechers et al, 2010b). At the moment, it is unclear to what extent the method of fitting photometric redshifts to DSFGs needs revision, as larger statistical samples are necessary to really determine the relative shortcomings of any redshift-distribution measurement technique.…”

Section: Redshift Distributions Of 850µm-14 Mm-selected Dsfg Populatmentioning

confidence: 99%

Dusty star-forming galaxies at high redshift

2014

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Far-infrared and submillimeter wavelength surveys have now established the important role of dusty, star-forming galaxies (DSFGs) in the assembly of stellar mass and the evolution of massive galaxies in the Universe. The brightest of these galaxies have infrared luminosities in excess of 10 13 L with implied star-formation rates of thousands of solar masses per year. They represent the most intense starbursts in the Universe, yet many are completely optically obscured. Their easy detection at submm wavelengths is due to dust heated by ultraviolet radiation of newly forming stars. When summed up, all of the dusty, star-forming galaxies in the Universe produce an infrared radiation field that has an equal energy density as the direct starlight emission from all galaxies visible at ultraviolet and optical wavelengths. The bulk of this infrared extragalactic background light emanates from galaxies as diverse as gas-rich disks to mergers of intense starbursting galaxies. Major advances in far-infrared instrumentation in recent years, both spacebased and ground-based, has led to the detection of nearly a million DSFGs, yet our understanding of the underlying astrophysics that govern the start and end of the dusty starburst phase is still in nascent stage. This review is aimed at summarizing the current status of DSFG studies, focusing especially on the detailed characterization of the bestunderstood subset (submillimeter galaxies, who were summarized in the last review of this field over a decade ago, Blain et al. 2002), but also the selection and characterization of more recently discovered DSFG populations. We review DSFG population statistics, their physical properties including dust, gas and stellar contents, their environments, and current theoretical models related to the formation and evolution of these galaxies.

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Section: Redshift Distributions Of 850µm-14 Mm-selected Dsfg Populatmentioning

confidence: 99%

Dusty star-forming galaxies at high redshift

2014

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“…Objects with a probability greater than 50% of being at z > 4, based on the Ilbert et al (2010) photo-z catalog, were also included if they met the flux limit. Finally, to avoid any biases against heavily dust obscured objects (e.g., Capak et al 2008Capak et al , 2011b, sources meeting the LBG or photo-z criteria and also detected by Chandra, Spitzer MIPS (24 μ), AzTEC (1.1 mm), Mambo (1.24 mm), BoloCam (1.1 mm) or the VLA (20 cm) were also included in the sample even if they were fainter than the flux limit.…”

Section: Source Selectionmentioning

confidence: 99%

Lyα EMISSION FROM HIGH-REDSHIFT SOURCES IN COSMOS

Mallery

Mobasher

Capak

et al. 2012

ApJ

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We investigate spectroscopically measured Lyα equivalent widths (EWs) and escape fractions of 244 sources of which 95 are Lyman break galaxies (LBGs) and 106 Lyman alpha emitters (LAEs) at z ∼ 4.2, z ∼ 4.8, and z ∼ 5.6 selected from intermediate and narrowband observations. The sources were selected from the Cosmic Evolution Survey and observed with the DEIMOS spectrograph. We find that the distribution of EWs shows no evolution with redshift for both the LBG selected sources and the intermediate/narrowband LAEs. We also find that the Lyα escape fraction of intermediate/narrowband LAEs is on average higher and has a larger variation than the escape fraction of LBG selected sources. The escape fraction does not show a dependence with redshift. Similar to what has been found for LAEs at low redshifts, the sources with the highest extinctions show the lowest escape fractions. The range of escape fractions increases with decreasing extinction. This is evidence that the dust extinction is the most important factor affecting the escape of Lyα photons, but at low extinctions other factors, such as the H i covering fraction and gas kinematics, can be just as effective at inhibiting the escape of Lyα photons.

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“…On one hand, almost all ultraluminous galaxies in the local universe are interacting galaxies and mergers (e.g., Farrah et al 2001Farrah et al , 2002Bridge et al 2007;Haan et al 2011). At high-z, a considerable number of SMGs are also found to be galaxy mergers (e.g., Capak et al 2008;Ivison et al 2008Ivison et al , 2013Tacconi et al 2008;Fu et al 2013;Messias et al 2014;Rawle et al 2014;Oteo et al 2016;Riechers et al 2017;Marrone et al 2018), although isolated clumpy gas-rich disk galaxies can also reach extremely large SFRs (e.g., Tacconi et al 2010;Bournaud et al 2014). On the other hand, some authors suggest, based on simulations, that high star formation 1 rates ( M SFRs 1000  ⪆ yr −1 ) in some SMGs are difficult to explain by a merger scenario alone, and propose that the predominant mechanism is smooth accretion of cold gas or infall of gas previously ejected via stellar feedback (e.g., Kereš et al 2005;Dekel et al 2009;Narayanan et al 2015).…”

Section: Introductionmentioning

confidence: 99%

The Strong Gravitationally Lensed Herschel Galaxy HLock01: Optical Spectroscopy Reveals a Close Galaxy Merger with Evidence of Inflowing Gas

Marques-Chaves

Pérez-Fournón

Gavazzi

et al. 2018

ApJ

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Citation for published item:w rquesEgh vesD ui nd ¡ erezEpournonD ssm el nd q v zziD ph el nd w rt¡ %nezEx v j sD lom sF nd ie hersD hominik nd igopoulouD himitr nd g rer Ev versD entonio nd glementsD h vid vF nd goor yD es nth nd p rr hD hun n nd svisonD o tF nd tim¡ enezE ¡ engelD g milo iF nd x yyeriD roosh ng nd yliverD e nd ymontD el in nd ottD hougl s nd huD iping nd rdlowD tulie @PHIVA 9 he strong gr vit tion lly lensed rers hel q l xy rvo kHI X opti l spe tros opy reve ls lose g l xy merger with eviden e of in)owing g sF9D estrophysi l journ lFD VSR @PAF pF ISIF Further information on publisher's website: Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThe submillimeter galaxy (SMG) HERMES J105751.1+573027 (hereafter HLock01) at z=2.9574±0.0001 is one of the brightest gravitationally lensed sources discovered in the Herschel Multi-tiered Extragalactic Survey. Apart from the high flux densities in the far-infrared, it is also extremely bright in the rest-frame ultraviolet (UV), with a total apparent magnitude m UV ;19.7 mag. We report here deep spectroscopic observations with the Gran Telescopio Canarias of the optically bright lensed images of HLock01. Our results suggest that HLock01 is a merger system composed of the Herschel-selected SMG and an optically bright Lyman break-like galaxy (LBG), separated by only 3.3 kpc in projection. While the SMG appears very massive(M * ;5×10 11 M e ), with a highly extinguished stellar component (A V ;4.3 ), the LBG is a young, lower-mass (M * ;1×10 10 M e ), but still luminous ( L 10 UV * ) satellite galaxy. Detailed analysis of the high signal-to-noise ratio (S/N) rest-frame UV spectrum of the LBG shows complex kinematics of the gas, exhibiting both blueshifted and redshifted absorption components. While the blueshifted component is associated with strong galactic outflows from the massive stars in the LBG, as is common in most star-forming galaxies, the redshifted component may be associated with gas inflow seen along a favorable sightline to the LBG. We also find evidence of an extended gas reservoir around HLock01 at an impact parameter of 110 kpc, through the detection of C II λλ1334 absorption in the red wing of a bright Lyα emitter at z;3.327. The data presented here highlight the power of gravitational lensing in high S/N studies to probe deeply into the physics of high-z star-forming galaxies.

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Spectroscopic Confirmation of an Extreme Starburst at Redshift 4.547

Cited by 137 publications

References 38 publications

Dusty star-forming galaxies at high redshift

Dusty star-forming galaxies at high redshift

Lyα EMISSION FROM HIGH-REDSHIFT SOURCES IN COSMOS

The Strong Gravitationally Lensed Herschel Galaxy HLock01: Optical Spectroscopy Reveals a Close Galaxy Merger with Evidence of Inflowing Gas

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