Improving the identification of high-<i>z</i><i>Herschel</i>sources with position priors and optical/NIR and FIR/mm photometric redshifts

Pérez‐González, P. G.; Egami, Eiichi; Rex, M.; Rawle, Tim; Kneib, Jean-Paul; Richard, Johan; Johansson, Daniel; Altiéri, B.; Blain, A. W.; Bock, J. J.; Boone, F.; Bridge, Carrie; Chung, Sun Mi; Clément, Benjamin; Clowe, Douglas; Combes, F.; Cuby, Jean-Gabriel; Dessauges‐Zavadsky, M.; Dowell, C. D.; Espino-Briones, Néstor; Fadda, D.; Fiedler, A.; Gonzalez, Anthony H.; Horellou, C.; Ilbert, O.; Ivison, R. J.; Jauzac, Mathilde; Lutz, D.; Pelló, R.; Pereira, M. J.; Rieke, G. H.; Rodighiero, G.; Schaerer, D.; Smith, Graham P.; Valtchanov, I.; Walth, Gregory; Werf, P. van der; Werner, M. W.; Zemcov, M.

doi:10.1051/0004-6361/201014593

Cited by 30 publications

(19 citation statements)

References 44 publications

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“…Submm and FIR observations by the SPIRE and PACS instruments on the Herschel satellite show counterparts of LABOCA sources Pérez-González et al 2010) as part of the Herschel Lensing Survey .…”

Section: E 0657-56mentioning

confidence: 99%

A LABOCA survey of submillimeter galaxies behind galaxy clusters

Johansson

Sigurdarson

Horellou

2011

A&A

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Context. Submillimeter galaxies are a population of dusty star-forming galaxies at high redshift. Measuring their properties will help relate them to other types of galaxies, both at high and low redshift. This is needed in order to understand the formation and evolution of galaxies. Aims. The aim is to use gravitational lensing by galaxy clusters to probe the faint and abundant submillimeter galaxy population down to a lower flux density level than what can be achieved in blank-field observations. Methods. We use the LABOCA bolometer camera on the APEX telescope to observe five clusters of galaxies at a wavelength of 870 μm. The final maps have an angular resolution of 27.5 and a point source noise level of 1.2-2.2 mJy. We model the mass distribution in the clusters as superpositions of spherical NFW halos and derive magnification maps that we use to calculate intrinsic flux densities as well as area-weighted number counts. We also use the positions of Spitzer MIPS 24 μm sources in four of the fields for a stacking analysis. Results. We detected 37 submm sources, out of which 14 have not been previously reported. One source has a sub-mJy intrinsic flux density. The derived number counts are consistent with previous results, after correction for gravitational magnification and completeness levels. The stacking analysis reveals an intrinsic 870 μm signal of 390 ± 27 μJy at 14.5σ significance. We study the S 24 μm -S 870 μm relation by stacking on subsamples of the 24 μm sources and find a linear relation at S 24 μm < 300 μJy, followed by a flattening at higher 24 μm flux densities. The signal from the significantly detected sources in the maps accounts for 13% of the Extragalactic Background Light discovered by COBE, and the stacked signal accounts for 11%.

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Section: E 0657-56mentioning

confidence: 99%

A LABOCA survey of submillimeter galaxies behind galaxy clusters

Johansson

Sigurdarson

Horellou

2011

A&A

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“…However, at z ∼ 1.5, galaxies present smaller colors than what the models for the appropriate luminosity range predict. This suggests that the excess in SFR TIR (24) could be related to a difference in spectral shapes for ULIRGs at high redshift in comparison with local ULIRGs either due to the strength of the PAH and the silicate features (Elbaz et al 2010;Pérez-González et al 2010) or due to additional continuum emission by an obscured AGN (Daddi et al 2007).…”

Section: Analysis Of Ir-based Sfrs: Best-effort Versus Mips 24 μMmentioning

confidence: 99%

UV-TO-FIR ANALYSIS OF SPITZER /IRAC SOURCES IN THE EXTENDED GROTH STRIP. II. PHOTOMETRIC REDSHIFTS, STELLAR MASSES, AND STAR FORMATION RATES

Barro

Pérez‐González

Gallego

et al. 2011

ApJS

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Based on the ultraviolet to far-infrared photometry already compiled and presented in a companion paper (Paper I), we present a detailed spectral energy distribution (SED) analysis of nearly 80,000 IRAC 3.6 + 4.5 μm selected galaxies in the Extended Groth Strip. We estimate photometric redshifts, stellar masses, and star formation rates (SFRs) separately for each galaxy in this large sample. The catalog includes 76,936 sources with [3.6] 23.75 (85% completeness level of the IRAC survey) over 0.48 deg 2 . The typical photometric redshift accuracy is Δz/(1 + z) = 0.034, with a catastrophic outlier fraction of just 2%. We quantify the systematics introduced by the use of different stellar population synthesis libraries and initial mass functions in the calculation of stellar masses. We find systematic offsets ranging from 0.1 to 0.4 dex, with a typical scatter of 0.3 dex. We also provide UV-and IR-based SFRs for all sample galaxies, based on several sets of dust emission templates and SFR indicators. We evaluate the systematic differences and goodness of the different SFR estimations using the deep FIDEL 70 μm data available in the Extended Groth Strip. Typical random uncertainties of the IR-bases SFRs are a factor of two, with non-negligible systematic effects at z 1.5 observed when only MIPS 24 μm data are available. All data products (SEDs, postage stamps from imaging data, and different estimations of the photometric redshifts, stellar masses, and SFRs of each galaxy) described in this and the companion paper are publicly available, and they can be accessed through our the Web interface utility Rainbow-navigator.

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“…A62, page 6 of 10 ( Wilson et al 2008;Rex et al 2009;Johansson et al 2010;Rex et al 2010;Pérez-González et al 2010). From the continuum data that include our SABOCA 350 μm measurement and the LABOCA 870 μm measurement of Johansson et al (2010) we constructed the FIR/submm spectral energy distribution (SED) displayed in Fig.…”

Section: Dust Propertiesmentioning

confidence: 99%

Molecular gas and dust in the highly magnifiedz ~ 2.8 galaxy behind the Bullet Cluster

Johansson¹,

Horellou²,

López-Cruz³

et al. 2012

A&A

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Context. The gravitational magnification provided by massive galaxy clusters makes it possible to probe the physical conditions in distant galaxies that are of lower luminosity than those in blank fields and likely more representative of the bulk of the high-redshift galaxy population. Aims. We aim to constrain the basic properties of molecular gas in a strongly magnified submm galaxy located behind the massive Bullet Cluster (1E 0657-56). This galaxy (SMM J0658) is split into three images, with a total magnification factor of almost 100. Methods. We used the Australia Telescope Compact Array (ATCA) to search for 12 CO(1-0) and 12 CO(3-2) line emission from SMM J0658. We also used the SABOCA bolometer camera on the Atacama Pathfinder EXperiment (APEX) telescope to measure the continuum emission at 350 μm. Results. CO(1-0) and CO(3-2) are detected at 6.8σ and 7.5σ significance when the spectra toward the two brightest images of the galaxy are combined. From the CO(1-0) luminosity we derive a mass of cold molecular gas of (1.8 ± 0.3) × 10 9 M , using the CO to H 2 conversion factor commonly used for luminous infrared galaxies. This is 45 ± 25% of the stellar mass. From the width of the CO lines we derive a dynamical mass within the CO-emitting region L of (1.3 ± 0.4) × 10 10 (L/1 kpc) M . We refine the redshift determination of SMM J0658 to z = 2.7793 ± 0.0003. The CO(3-2) to CO(1-0) brightness temperature ratio is 0.56 +0.21 −0.15 , which is similar to the values found in other star-forming galaxies. Continuum emission at 350 μm from SMM J0658 was detected with SABOCA at a signal-to-noise ratio of 3.6. The flux density is consistent with previous measurements at the same wavelength by the Herschel satellite and BLAST balloon-borne telescope. We study the spectral energy distribution of SMM J0658 and derive a dust temperature of 33 ± 5 K and a dust mass of 1.1 +0.8 −0.3 × 10 7 M . Conclusions. SMM J0658 is one of the least massive submm galaxies discovered so far. As a likely representative of the bulk of the submm galaxy population, it is a prime target for future observations.

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Improving the identification of high-zHerschelsources with position priors and optical/NIR and FIR/mm photometric redshifts

Cited by 30 publications

References 44 publications

A LABOCA survey of submillimeter galaxies behind galaxy clusters

A LABOCA survey of submillimeter galaxies behind galaxy clusters

UV-TO-FIR ANALYSIS OF SPITZER /IRAC SOURCES IN THE EXTENDED GROTH STRIP. II. PHOTOMETRIC REDSHIFTS, STELLAR MASSES, AND STAR FORMATION RATES

Molecular gas and dust in the highly magnifiedz ~ 2.8 galaxy behind the Bullet Cluster

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