Evidence for a Population of High‐Redshift Submillimeter Galaxies from Interferometric Imaging

Younger, Joshua D.; Fazio, G. G.; Huang, Jia-Sheng; Yun, Min S.; Wilson, Grant; Ashby, M. L. N.; Gurwell, M. A.; Lai, Kamson; Peck, A. B.; Petitpas, G.; Wilner, David J.; Iono, Daisuke; Kohno, Kotaro; Kawabe, Ryohei; Hughes, D. H.; Aretxaga, I.; Webb, Tracy; Martínez‐Sansigre, Alejo; Kim, Sungeun; Scott, K. S.; Austermann, J. E.; Perera, Thushara; Lowenthal, James D.; Schinnerer, E.; Smolčić, Vernesa

doi:10.1086/522776

Cited by 171 publications

(335 citation statements)

References 78 publications

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“…Thus the DSFGs seen in GN20 are likely the galaxies that will evolve in to brightest cluster galaxies (BCGs). Capak et al (2011) examined the COSMOS data set, and found four galaxies at z ∼ 5.3, all centered around an extreme starburst originally detected with the AzTEC camera at 1.1 mm, COSMOS AzTEC-3 (Younger et al, 2007). The system has an inferred star formation rate of ∼ 1500 M yr −1 , and within 2 Mpc of the starburst, there are 11 objects with luminosities greater than L * .…”

Section: Environments Of Dsfgsmentioning

confidence: 99%

“…First, several works fit the longwavelength data ( > ∼ 50µm) to a single temperature modified blackbody and then cut-off the SED at short wavelengths and attach a power-law SED such that S (ν) ∝ ν −α where dS /dν < ∼ − α Younger et al, 2007Younger et al, , 2009bRoseboom et al, 2013). In other words,…”

Section: Direct Modified Blackbody Sed Modelingmentioning

confidence: 99%

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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: Environments Of Dsfgsmentioning

confidence: 99%

Section: Direct Modified Blackbody Sed Modelingmentioning

confidence: 99%

Dusty star-forming galaxies at high redshift

2014

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“…Such extreme SFRs likely result from major mergers (e.g. Chapman et al 2004;Swinbank et al 2004;Greve et al 2005;Tacconi et al 2006Tacconi et al , 2008Younger et al 2007Younger et al , 2008Berciano Alba et al 2010;Narayanan et al 2009Narayanan et al , 2010 and cannot be sustained for a long period (after a few hundred Myr at most the gas reservoir should be depleted; see Greve et al 2005;Hainline et al 2006).…”

Section: Star Formation Ratesmentioning

confidence: 99%

“…Due to the coarse resolution of SCUBA, localizations derived from high-resolution radio maps had to be used to measure their spectroscopic redshifts . Lots of studies have addressed the issue of characterizing the nature of SMGs (Egami et al 2004;Greve et al 2004Greve et al , 2005Smail et al 2004;Swinbank et al 2004Swinbank et al , 2006Swinbank et al , 2008Takagi et al 2004;Alexander et al 2005;Borys et al 2005;Kovács et al 2006;Laurent et al 2006;Pope et al 2006;Tacconi et al 2006Tacconi et al , 2008Takata et al 2006;Younger et al 2007Younger et al , 2008Younger et al , 2009aClements et al 2008;Coppin et al 2008;Dye et al 2008Dye et al , 2009Hainline et al 2009;Perera et al 2008;Scott et al 2008;Austermann et al 2009;Devlin et al 2009;Eales et al 2009;Murphy et al 2009;Murphy 2009;Tamura et al 2009;Weiß et al 2009b;Aravena et al 2010, some of these works were based on surveys with sensitivity worse than 3 mJy quoted above). However they were usually based on limited samples ( 20 sources), limited wavelength coverage or photometric redshifts.…”

Section: Introductionmentioning

confidence: 99%

Cosmic evolution of submillimeter galaxies and their contribution to stellar mass assembly

Michalowski

Hjorth

Watson

2010

A&A

234

278

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The nature of galaxies selected at submillimeter wavelengths (SMGs, S 850 3 mJy), some of the bolometrically most luminous objects at high redshifts, is still elusive. In particular their star formation histories and source of emission are not accurately constrained. In this paper we introduce a new approach to analyse the SMG data. Namely, we present the first self-consistent UV-to-radio spectral energy distribution fits of 76 SMGs with spectroscopic redshifts using all photometric datapoints from ultraviolet to radio simultaneously. We find that they are highly star-forming (median star formation rate 713 M yr −1 for SMGs at z > 0.5), moderately dust-obscured (median A V ∼ 2 mag), hosting significant stellar populations (median stellar mass 3.7 × 10 11 M ) of which only a minor part has been formed in the ongoing starburst episode. This implies that in the past, SMGs experienced either another starburst episode or merger with several galaxies. The properties of SMGs suggest that they are progenitors of present-day elliptical galaxies. We find that these bright SMGs contribute significantly to the cosmic star formation rate density (∼20%) and stellar mass density (∼30-50%) at redshifts 2-4. Using number counts at low fluxes we find that as much as 80% of the cosmic star formation at these redshifts took place in SMGs brighter than 0.1 mJy. We find evidence that a linear infrared-radio correlation holds for SMGs in an unchanged form up to redshift of 3.6, though its normalization is offset from the local relation by a factor of ∼2.1 towards higher radio luminosities. We present a compilation of photometry data of SMGs and determinations of cosmic SFR and stellar mass densities.

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“…The source counterparts at other wavelengths can only be correctly identified if the exact location of the FIR/(sub)mm emission is known, which in practice requires the analysis of FIR or (sub)mm interferometric observations to achieve this goal (e.g. Frayer et al 2000;Younger et al 2007Younger et al , 2008Younger et al , 2009Dannerbauer et al 2008;Aravena et al 2010b;Smolčić et al 2012a,b;Karim et al 2013;Hodge et al 2013). To date, however, only a few fluxlimited SMG samples have been followed up with interferometers (Younger et al 2007Smolčić et al 2012b;Barger et al 2012;Karim et al 2013;Hodge et al 2013).…”

mentioning

confidence: 99%

(Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies

Miettinen

Smolčić

Novak

et al. 2015

A&A

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We used the Plateau de Bure Interferometer (PdBI) to map a sample of 15 submillimetre galaxies (SMGs) in the COSMOS field at the wavelength of 1.3 mm. The target SMGs were originally discovered in the James Clerk Maxwell Telescope (JCMT)/AzTEC 1.1 mm continuum survey at S/N 1.1 mm = 4−4.5. This paper presents, for the first time, interferometric millimetre-wavelength observations of these sources. The angular resolution of our observations, ∼1. 8, allowed us to accurately determine the positions of the target SMGs. Using a detection threshold of S/N 1.3 mm > 4.5 regardless of multiwavelength counterpart association, and 4 < S/N 1.3 mm ≤ 4.5 if a multiwavelength counterpart within 1. 5 is also present, the total number of detections in our survey is 22. The most significant PdBI detection of S/N 1.3 mm = 10.3 is towards AzTEC19. Three of our detected SMGs (AzTEC21, 27, and 28; which corresponds to 20%) are marginally resolved at our angular resolution, and these sources are found to have elongated or clumpy morphologies and/or multiple components. Using optical to near-infrared photometric redshifts, available spectroscopic redshifts, and redshifts estimated from the radio-to-submm spectral index we infer a median redshift ofz = 3.20 ± 0.25 for our sample. To study the overall multiplicity and redshift distribution of flux-limited samples of SMGs we combined these sources with the 15 brightest JCMT/AzTEC SMGs detected at 1.1 mm, AzTEC1−15, and studied previously. This constitutes a complete, flux-and S/N-limited 1.1-mm selected sample. We find that the median redshift for the 15 brightest JCMT/AzTEC SMGs (z = 3.05 ± 0.44) is consistent with that for AzTEC16−30. This conforms to recent observational findings that SMGs do not exhibit any significant trend between the redshift and (sub)mm flux density. For the combined AzTEC1−30 sample we derive a median redshift ofz = 3.17 ± 0.27, consistent with previous results based on mm-selected samples. We further infer that within the combined AzTEC1−30 sample ∼25 ± 9% of sources separate into multiple components.

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Evidence for a Population of High‐Redshift Submillimeter Galaxies from Interferometric Imaging

Cited by 171 publications

References 78 publications

Dusty star-forming galaxies at high redshift

Dusty star-forming galaxies at high redshift

Cosmic evolution of submillimeter galaxies and their contribution to stellar mass assembly

(Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies

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