On the colour–colour properties of the Extremely Red Objects

Bergström, Stefan; Wiklind, T.

doi:10.1051/0004-6361:20031608

Cited by 15 publications

(24 citation statements)

References 40 publications

(60 reference statements)

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“…We emphasize that this failure persists when we isolate only those SMG/OFRG EROs at z < 2 (cf. Bergstrom & Wiklind 2004). We also reiterate that only a modest fraction of SMG/OFRGs have red enough colors, $10%-30% with (I À K ) !…”

Section: Color-magg Nitude and Color-color Distributionsmentioning

confidence: 64%

“…The OFRGs are plotted with open symbols, and all the points are coded in terms of their redshifts. We also indicate the classification scheme proposed by Bergstrom & Wiklind (2004) to distinguish between extremely red galaxies that are red by virtue of either dust [active star-forming galaxies with redder (J À K ) colors] or passive, evolved stellar populations [which have bluer (J À K ) colors] at z < 2:2. Note that this only applies to the SMG/OFRGs in our lowest redshift slice.…”

Section: Hst Optical Observv Ationsmentioning

confidence: 99%

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The Rest‐Frame Optical Properties of SCUBA Galaxies

Smail

Chapman

Blain

et al. 2004

ApJ

176

227

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We present optical and near-infrared photometry for a sample of 96 dusty, far-infrared-luminous galaxies. We have precise spectroscopic redshifts for all these galaxies, yielding a median redshift of z h i ¼ 2:2. The majority, 78, are submillimeter-detected galaxies lying at z ¼ 0:2 3:6, while the remaining 18 are optically faint Jy radio galaxies at z ¼ 0:9 3:4 that are proposed to be similarly luminous, dusty galaxies whose dust emission is too hot to be detected in the submillimeter waveband. We compare the photometric and morphological properties of these distant, ultraluminous galaxies with local samples of dusty, luminous galaxies. We confirm that spectroscopically identified far-infrared-luminous galaxies at z > 1 display a wide variety in their optical-near-infrared and nearinfrared colors, with only a modest proportion red enough to classify as unusually red. We show that, on average, luminous, high-redshift dusty galaxies are both brighter and redder in rest-frame optical passbands than comparable samples of UV-selected star-forming galaxies at similar redshifts. Archival Hubble Space Telescope ACS imaging of 20 of our galaxies demonstrates both morphological indications of mergers and interactions, which may have triggered their luminous far-infrared activity, and structured dust distributions within these galaxies. We derive a near-infrared Hubble diagram for far-infrared-luminous galaxies. This shows that this population is typically fainter than high-luminosity radio galaxies at similar redshifts and exhibits significantly more scatter in their K-band magnitudes. The rest-frame optical luminosities of the far-infrared-luminous population are comparable to those of local ultraluminous infrared galaxies, although their far-infrared luminosities are several times higher. The typical extinction-corrected optical luminosity of the high-redshift population, assuming passive evolution, provides a good fit to the bright end of the luminosity function of luminous spheroidal galaxies seen in rich clusters at intermediate redshifts. This adds to the growing body of evidence showing that these highredshift, far-infrared-luminous sources identify star formation and active galactic nucleus-fueling events in the early life of massive galaxies in the universe.

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Section: Color-magg Nitude and Color-color Distributionsmentioning

confidence: 64%

Section: Hst Optical Observv Ationsmentioning

confidence: 99%

The Rest‐Frame Optical Properties of SCUBA Galaxies

Smail

Chapman

Blain

et al. 2004

ApJ

176

227

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“…R AB − K AB > ∼ 3.4, possibly with additional color criteria (Cimatti et al 2002).They are generally identified as either old, passively evolving, elliptical galaxies or dusty starburst galaxies (Pierini et al 2004;Bergström & Wiklind 2004). Despite their faintness in the optical bands, the vast majority of the ERO population present in our data are detected in the r , i or z bands, and are therefore not selected as LAE candidates.…”

Section: Extremely Red Objectsmentioning

confidence: 80%

Limits on the luminosity function of Lyαemitters atz= 7.7

Hibon

Cuby

Willis

et al. 2010

A&A

101

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Aims. The Lyα luminosity function (LF) of high-redshift Lyα emitters (LAEs) is one of the few observables of the re-ionization epoch accessible with 8-10 m class telescopes. The evolution of the LAE LF with redshift is dependent upon the physical evolution of LAEs and the ionisation state of the Universe towards the end of the Dark Ages. Methods. We performed a narrow-band imaging program at 1.06 μm using CFHT/WIRCam. The observations target Lyα emitters at redshift z ∼ 7.7 in the CFHT-LS D1 field. From these observations we derived a photometric sample of 7 LAE candidates at z ∼ 7.7. Results. We derive luminosity functions for the full sample of seven objects and for subsamples of four objects. Assuming the brightest objects in our sample are real, we find that the resulting luminosity function is not consistent with previous work at lower redshifts. More definitive conclusions will require spectroscopic confirmation.

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“…We also checked the colour−colour separation scheme presented by Bergström & Wiklind (2004) using R − J vs. J − K colours (see their Fig. 8).…”

Section: Colour-colour Selectionsmentioning

confidence: 99%

Number counts of bright extremely red objects: Evolved massive galaxies atz $\sim1$

Vaïsänen

Johansson

2004

A&A

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Abstract. We present results on number counts of Extremely Red Objects (EROs) in a 2850 arcmin 2 near-infrared survey performed in European Large Area ISO Survey (ELAIS) fields at K < 17.5. Counts of EROs are extended to brighter levels than available previously, giving 0.002 ± 0.001 arcmin −2 at K < 16.5 and consistent numbers with literature values at fainter magnitudes. Photometric redshifts from HYPERZ as well as GRASIL model SEDs of galaxies imply that our EROs are located in the range z = 0.7−1.5, with the bulk of the population at z ∼ 1. Taking advantage of the ISO data in the fields, we use mid-IR detections to constrain the number of dusty EROs, and also discuss the superior capabilities of Spitzer Space Telescope to detect dusty EROs. Both the mid-IR data and the use of colour−colour diagrammes indicate that at most 10−20% of the EROs in this bright regime are dusty starbursting systems. The space density of our EROs, interpreted to be counterparts of local >2−3 L massive galaxies at around z ∼ 1, is estimated to be ≈2 × 10 −5 Mpc −3 , which is consistent with local values. Furthermore, the cumulative number counts at our bright magnitudes are remarkably well fitted by pure luminosity evolution models.

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On the colour–colour properties of the Extremely Red Objects

Cited by 15 publications

References 40 publications

The Rest‐Frame Optical Properties of SCUBA Galaxies

The Rest‐Frame Optical Properties of SCUBA Galaxies

Limits on the luminosity function of Lyαemitters atz= 7.7

Number counts of bright extremely red objects: Evolved massive galaxies atz $\sim1$

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