Revealing the complex nature of the strong gravitationally lensed system H-ATLAS J090311.6+003906 using ALMA

Dye, S.; Furlanetto, C.; Swinbank, A. M.; Vlahakis, C.; Nightingale, J. W.; Dunne, L.; Eales, Stephen Anthony; Smail, Ian; Oteo, I.; Hunter, T. R.; Negrello, M.; Dannerbauer, H.; Ivison, R. J.; Gavazzi, R.; Cooray, Asantha; Werf, P. van der

doi:10.1093/mnras/stv1442

Cited by 96 publications

(146 citation statements)

References 62 publications

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“…In contrast, we reported a median half-light radius of 1.53 kpc in Bussmann et al (2013). Lens models from higher resolution data with ALMA suggest that magnification factors could increase by a factor of ≈1.5-2 (Dye et al 2015;Rybak et al 2015;Tamura et al 2015). Therefore, it is plausible that both of the intrinsic luminosity functions tested here provide statistically consistent fits to the data.…”

Section: Comparing Models With Datamentioning

confidence: 48%

HerMES: ALMA IMAGING OFHERSCHEL-SELECTED DUSTY STAR-FORMING GALAXIES

Bussmann

Riechers

Fialkov

et al. 2015

ApJ

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109

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The Herschel Multi-tiered Extragalactic Survey (HerMES) has identified large numbers of dusty star-forming galaxies (DSFGs) over a wide range in redshift. A detailed understanding of these DSFGs is hampered by the limited spatial resolution of Herschel. We present 870 μm 0 45 resolution imaging obtained with the Atacama Large Millimeter/submillimeter Array (ALMA) of a sample of 29 HerMES DSFGs that have far-infrared (FIR) flux densities that lie between the brightest of sources found by Herschel and fainter DSFGs found via groundbased surveys in the submillimeter region. The ALMA imaging reveals that these DSFGs comprise a total of 62 sources (down to the 5s point-source sensitivity limit in our ALMA sample; 0.2 mJy s » ). Optical or nearinfrared imaging indicates that 36 of the ALMA sources experience a significant flux boost from gravitational lensing ( 1.1 m > ), but only six are strongly lensed and show multiple images. We introduce and make use of UVMCMCFIT, a general-purpose and publicly available Markov chain Monte Carlo visibility-plane analysis tool to analyze the source properties. Combined with our previous work on brighter Herschel sources, the lens models presented here tentatively favor intrinsic number counts for DSFGs with a break near 8 mJy at 880 m m and a steep fall-off at higher flux densities. Nearly 70% of the Herschel sources break down into multiple ALMA counterparts, consistent with previous research indicating that the multiplicity rate is high in bright sources discovered in singledish submillimeter or FIR surveys. The ALMA counterparts to our Herschel targets are located significantly closer to each other than ALMA counterparts to sources found in the LABOCA ECDFS Submillimeter Survey. Theoretical models underpredict the excess number of sources with small separations seen in our ALMA sample. The high multiplicity rate and small projected separations between sources seen in our sample argue in favor of interactions and mergers plausibly driving both the prodigious emission from the brightest DSFGs as well as the sharp downturn above S 8 mJy 880 = .

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Section: Comparing Models With Datamentioning

confidence: 48%

HerMES: ALMA IMAGING OFHERSCHEL-SELECTED DUSTY STAR-FORMING GALAXIES

Bussmann

Riechers

Fialkov

et al. 2015

ApJ

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109

159

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“…This difference suggests a spatial offset between the stellar component and the gas and dust component of the source galaxy, as was seen in SDP.81 (e.g., Dye et al 2015;Hatsukade et al 2015;Rybak et al 2015b), as well as other lensed submillimeter galaxies (e.g., Iono et al 2006;Fu et al 2012).…”

Section: Lens Model Resultsmentioning

confidence: 75%

ALMA Observations of the Gravitational Lens SDP.9

Wong

Ishida

Tamura

et al. 2017

ApJL

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We present long-baseline ALMA observations of the strong gravitational lens H-ATLAS J090740.0-004200 (SDP.9), which consists of an elliptical galaxy at z L = 0.6129 lensing a background submillimeter galaxy into two extended arcs. The data include Band 6 continuum observations, as well as CO J=6−5 molecular line observations, from which we measure an updated source redshift of z S = 1.5747. The image morphology in the ALMA data is different from that of the HST data, indicating a spatial offset between the stellar, gas, and dust component of the source galaxy. We model the lens as an elliptical power law density profile with external shear using a combination of archival HST data and conjugate points identified in the ALMA data. Our best model has an Einstein radius of θ E = 0.66 ± 0.01 and a slightly steeper than isothermal mass profile slope. We search for the central image of the lens, which can be used constrain the inner mass distribution of the lens galaxy including the central supermassive black hole, but do not detect it in the integrated CO image at a 3σ rms level of 0.0471 Jy km s −1 .

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“…Negrello et al (2010) showed SDP.81 is lensed using 880 µm Sub-Millimetre Array observations. Dye et al (2015) and Tamura et al (2015) reconstructed the galaxy from the ALMA observation, by modelling the distorting effect of the lens. They found a magnification of ∼ 11.…”

Section: The Selection Of the Herbs Samplementioning

confidence: 99%

“…As most intervening, lensing sources are passively evolving ellipticals, they are sub-mm dim and their contribution to the total measured flux density is minimal. This allowed ALMA Partnership (2015), Dye et al (2015), Hatsukade et al (2015), Rybak et al (2015), Swinbank et al (2015) and Tamura et al (2015) to study SDP.81 down to sub-kiloparsec scales, using the increase in angular size in order to resolve the morphological and dynamical properties of a galaxy at a redshift of 3.…”

Section: Introductionmentioning

confidence: 99%

The Herschel Bright Sources (HerBS): sample definition and SCUBA-2 observations

Bakx

Eales

Negrello

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present the Herschel Bright Sources (HerBS) sample, a sample of bright, high-redshift Herschel sources detected in the 616.4 square degree H-ATLAS survey. The HerBS sample contains 209 galaxies, selected with a 500 µm flux density greater than 80 mJy and an estimated redshift greater than 2. The sample consists of a combination of HyLIRGs and lensed ULIRGs during the epoch of peak cosmic star formation. In this paper, we present SCUBA-2 observations at 850 µm of 189 galaxies of the HerBS sample, 152 of these sources were detected. We fit a spectral template to the Herschel-SPIRE and 850 µm SCUBA-2 flux densities of 22 sources with spectroscopically determined redshifts, using a two-component modified blackbody spectrum as a template. We find a cold-and hot-dust temperature of 21.29 +1.35 −1.66 K and 45.80 +2.88 −3.48 K, a cold-to-hot dust mass ratio of 26.62 +5.61 −6.74 and a β of 1.83 +0.14 −0.28 . The poor quality of the fit suggests that the sample of galaxies is too diverse to be explained by our simple model. Comparison of our sample to a galaxy evolution model indicates that the fraction of lenses is high. Out of the 152 SCUBA-2 detected galaxies, the model predicts 128.4 ± 2.1 of those galaxies to be lensed (84.5%). The SPIRE 500 µm flux suggests that out of all 209 HerBS sources, we expect 158.1 ± 1.7 lensed sources, giving a total lensing fraction of 76 per cent.

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Revealing the complex nature of the strong gravitationally lensed system H-ATLAS J090311.6+003906 using ALMA

Cited by 96 publications

References 62 publications

HerMES: ALMA IMAGING OFHERSCHEL-SELECTED DUSTY STAR-FORMING GALAXIES

HerMES: ALMA IMAGING OFHERSCHEL-SELECTED DUSTY STAR-FORMING GALAXIES

ALMA Observations of the Gravitational Lens SDP.9

The Herschel Bright Sources (HerBS): sample definition and SCUBA-2 observations

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