<i>Planck</i>’s dusty GEMS

Cañameras, R.; Nesvadba, N. P. H.; Kneißl, R.; Limousin, M.; Gavazzi, R.; Scott, Douglas; Dole, H.; Frye, Brenda; Koenig, S.; Floc’h, E. Le; Oteo, I.

doi:10.1051/0004-6361/201630359

Cited by 24 publications

(37 citation statements)

References 41 publications

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“…The projected distance between the two blobs of 2 (17.4 kpc) is also consistent with merger scenario. In the literature, we find only one lens at a higher redshift presented in Cañameras et al (2017) at z spec = 1.525, which is gravitationally lensing an SMG detected by Planck.…”

Section: Redshift Determination For the Lensmentioning

confidence: 66%

“…The ISM of high-z sources can thus be studied through the easier detection of lines, thanks to flux boosting (for instance, Weiß et al 2013;Alaghband-Zadeh et al 2013;Béthermin et al 2015;Bothwell et al 2017;Yang et al 2017;Cunningham et al 2019). Another aspect of gravitational lensing is that the deflection of the light emitted by a background source allows us to probe the mass distribution of the foreground source acting as the lens, constraining dark matter (DM) sub-halo structures (Hezaveh et al 2016) as well as the initial mass function (IMF; Cañameras et al 2017), for instance. Finally, gravitational lensing boosts the angular resolution with which we can observe background sources allowing spatially resolved studies of the ISM of high redshift galaxies (for instance, Swinbank et al 2015;Cañameras et al 2018;Litke et al 2019;Yang et al 2019a;Apostolovski et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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A hyper luminous starburst at z = 4.72 magnified by a lensing galaxy pair at z = 1.48

Ciesla

Béthermin

Daddi

et al. 2020

A&A

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We serendipitously discovered in the Herschel Reference Survey an extremely bright infrared source with S500 ∼ 120 mJy in the line of sight of the Virgo cluster which we name Red Virgo 4 (RV4). Based on IRAM/EMIR and IRAM/NOEMA detections of the CO(5−4), CO(4−3), and [CI] lines, RV4 is located at a redshift of 4.724, yielding a total observed infrared luminosity of 1.1 ± 0.6 × 1014 L⊙. At the position of the Herschel emission, three blobs are detected with the VLA at 10 cm. The CO(5−4) line detection of each blob confirms that they are at the same redshift with the same line width, indicating that they are multiple images of the same source. In Spitzer and deep optical observations, two sources, High-z Lens 1 (HL1) West and HL1 East, are detected at the center of the three VLA/NOEMA blobs. These two sources are placed at z = 1.48 with X-shooter spectra, suggesting that they could be merging and gravitationally lensing the emission of RV4. HL1 is the second most distant lens known to date in strong lensing systems. Constrained by the position of the three VLA/NOEMA blobs, the Einstein radius of the lensing system is 2.2″ ± 0.2 (20 kpc). The high redshift of HL1 and the large Einstein radius are highly unusual for a strong lensing system. In this paper, we present the insterstellar medium properties of the background source RV4. Different estimates of the gas depletion time yield low values suggesting that RV4 is a starburst galaxy. Among all high-z submillimeter galaxies, this source exhibits one of the lowest L[CI] to LIR ratios, 3.2 ± 0.9 × 10−6, suggesting an extremely short gas depletion time of only 14 ± 5 Myr. It also shows a relatively high L[CI] to LCO(4−3) ratio (0.7 ± 0.2) and low LCO(5−4) to LIR ratio (only ∼50% of the value expected for normal galaxies) hinting at low density of gas. Finally, we discuss the short depletion time of RV4. It can be explained by either a very high star formation efficiency, which is difficult to reconcile with major mergers simulations of high-z galaxies, or a rapid decrease of star formation, which would bias the estimate of the depletion time toward an artificially low value.

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Section: Redshift Determination For the Lensmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

A hyper luminous starburst at z = 4.72 magnified by a lensing galaxy pair at z = 1.48

Ciesla

Béthermin

Daddi

et al. 2020

A&A

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“…We have followed up 61 Planck high-z candidates using SCUBA-2 on the JCMT. Of these, 10 are strong gravitational lenses, discussed in Canameras et al (2015). The other 51 of the fields are referred to as "Planck overdensities" and are possible proto-cluster candidates.…”

Section: Discussionmentioning

confidence: 99%

“…This instrument, with a beamsize 16 times smaller than Planck's, has the ability to resolve the Planck candidates into either single bright point sources or many fainter sources. The former were shown by Canameras et al (2015) to be among the brightest strongly lensed sources on the sky; 11 out of 15 of these bright sources were followed-up (two more were previously known, as discussed in Fu et al 2012 andCombes et al 2012, while the remaining two are in the far south) with a host of instruments, including SCUBA-2 at 850 µm, spectroscopic observations using the wide-band heterodyne receiver Eight MIxer Receiver (EMIR) at the Institut de Radioastronomie Millimétrique telescope (IRAM) and SMA 850 µm interferometry, to confirm their lensed nature. Their redshifts range from 2.2 to 3.6, with peak flux densities from 0.35 to 1.14 Jy, and they have apparent far-IR luminosities up to 3×10 14 L⊙.…”

Section: Introductionmentioning

confidence: 95%

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SCUBA-2 follow-up of Herschel-SPIRE observed Planck overdensities

Mackenzie

Scott

Bianconi

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present SCUBA-2 follow-up of 61 candidate high-redshift Planck sources. Of these, 10 are confirmed strong gravitational lenses and comprise some of the brightest such submm sources on the observed sky, while 51 are candidate proto-cluster fields undergoing massive starburst events. With the accompanying Herschel-SPIRE observations and assuming an empirical dust temperature prior of 34 +13 −9 K, we provide photometric redshift and far-IR luminosity estimates for 172 SCUBA-2-selected sources within these Planck overdensity fields. The redshift distribution of the sources peak between a redshift of 2 and 4, with one third of the sources having S 500 /S 350 > 1. For the majority of the sources, we find far-IR luminosities of approximately 10 13 L ⊙ , corresponding to star-formation rates of around 1000 M ⊙ yr −1 . For S 850 > 8 mJy sources, we show that there is up to an order of magnitude increase in star-formation rate density and an increase in uncorrected number counts of 6 for S 850 > 8 mJy when compared to typical cosmological survey fields. The sources detected with SCUBA-2 account for only approximately 5 per cent of the Planck flux at 353 GHz, and thus many more fainter sources are expected in these fields.

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Planck’s dusty GEMS

Cañameras

Nesvadba

Kneißl

et al. 2017

A&A

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We present an analysis of high-resolution ALMA interferometry of CO(4-3) line emission and dust continuum in the "Ruby" (PLCK G244.8+54.9), a bright, gravitationally lensed galaxy at z= 3.0 discovered with the Planck all-sky survey. The Ruby is the brightest of Planck's Dusty GEMS, a sample of 11 of the brightest gravitationally lensed high-redshift galaxies on the extragalactic sub-mm sky. We resolve the high-surface-brightness continuum and CO line emission of the Ruby in several extended clumps along a partial, nearly circular Einstein ring with 1.4 diameter around a massive galaxy at z = 1.5. Local star-formation intensities are up to 2000 M yr −1 kpc −2 , amongst the highest observed at high redshift, and clearly in the range of maximal starbursts. Gas-mass surface densities are a few ×10 4 M pc −2 . The Ruby lies at, and in part even above, the starburst sequence in the Schmidt-Kennicutt diagram, and at the limit expected for star formation that is self-regulated through the kinetic energy injection from radiation pressure, stellar winds, and supernovae. We show that these processes can also inject sufficient kinetic energy and momentum into the gas to explain the turbulent line widths, which are consistent with marginally gravitationally bound molecular clouds embedded in a critically Toomre-stable disk. The star-formation efficiency is in the range 1-10% per free-fall time, consistent with the notion that the pressure balance that sets the local star-formation law in the Milky Way may well be universal out to the highest star-formation intensities. AGN feedback is not necessary to regulate the star formation in the Ruby, in agreement with the absence of a bright AGN component in the infrared and radio regimes.

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Planck’s dusty GEMS

Cited by 24 publications

References 41 publications

A hyper luminous starburst at z = 4.72 magnified by a lensing galaxy pair at z = 1.48

A hyper luminous starburst at z = 4.72 magnified by a lensing galaxy pair at z = 1.48

SCUBA-2 follow-up of Herschel-SPIRE observed Planck overdensities

Planck’s dusty GEMS

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