Highly-magnified, multiply-imaged radio counterparts of the sub-mm starburst emission in the cluster-lens MS0451.6-0305

Alba, A. Berciano; Garrett, M. A.; Koopmans, L. V. E.; Wucknitz, O.

doi:10.1051/0004-6361:20065223

Cited by 11 publications

(23 citation statements)

References 31 publications

(33 reference statements)

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“…The radio detections located outside the sub-mm emission, labeled Fd and Fe, are the same sources reported in Berciano Alba et al (2007). Their morphology in the new high resolution radio map is very elongated, typical of radio jets produced by AGNs.…”

Section: Catalog Of Radio Sourcessupporting

confidence: 69%

“…The details of both sets of observations are presented in Sect. 2, together with a description of the data analysis procedure, which has been considerably improved with respect to Berciano Alba et al (2007). Section 3 is dedicated to the analysis of the final combined data set, from which we characterise the compact and extended radio emission detected within SMM J04542-0301.…”

Section: Fig 1 Summary Of the Results Presented Inmentioning

confidence: 99%

“…The first time that these observations were analyzed (Berciano Alba et al 2007), they were treated as a single epoch and averaged on time, with no independent calibration for each IF. However, since our goal is to combine the data from both array configurations to produce a more sensitive map of the target, the B-array observations were re-reduced following essentially the same procedure described in the previous section.…”

Section: B-array Observationsmentioning

confidence: 99%

“…To date, only one multiplyimaged faint SMGs has been confirmed: SMM J16359+6612, located near the core of the cluster A2218 (Kneib et al 2004Garrett et al 2005;Knudsen et al 2008Knudsen et al , 2009). There are, however, two other clusters which seem to host multiplyimaged SMGs: A1689 (Knudsen et al 2008) and MS0451.6-0305 (Chapman et al 2002;Borys et al 2004;Berciano Alba et al 2007). …”

Section: Introductionmentioning

confidence: 99%

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Radio counterpart of the lensed submm emission in the cluster MS0451.6-0305: new evidence for the merger scenario

Alba

Koopmans²,

Garrett³

et al. 2010

A&A

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Context. SMM J04542-0301 is an extended (∼1 ) submm source located near the core of the cluster MS0451.6-0305. It has been suggested that part of its emission arises from the interaction between a LBG and two EROs at z ∼ 2.9 that are multiply-imaged in the optical/NIR observations. However, the dramatic resolution difference between the sub-mm map and the optical/NIR images make it difficult to confirm this hypothesis. Aims. In a previous paper, we reported the detection of 1.4 GHz continuum radio emission coincident with this sub-mm source using VLA archival data. To fully understand the relation between this radio emission, the sub-mm emission, and the optical/IR multiplyimaged sources, we have re-observed the cluster with the VLA at higher resolution. Methods. The previous archival data has been re-reduced and combined with the new observations to produced a deep (∼10 μJy beam −1 ), high resolution (∼2 ) map centred on the cluster core. The strong lensing effect in the radio data has been quantified by constructing a new lens model of the cluster. Results. From the high resolution map we have robustly identified six radio sources located within SMM J 04542-0301. The brightest and most extended of these sources (RJ) is located in the middle of the sub-mm emission, and has no obvious counterpart in the optical/NIR. Three other detections (E1, E2 and E3) seem to be associated with the images of one of the EROs (B), although the NIR and radio emission appear to originate at slightly different positions in the source plane. The last two detections (CR1 and CR2), for which no optical/NIR counterpart have been found, seem to constitute two relatively compact emitting regions embedded in a ∼5 extended radio source located at the position of the sub-mm peak. The presence of this extended component (which contributes 38% of the total radio flux in this region) can only be explained if it is being produced by a lensed region of dust obscured star formation in the center of the merger. A comparison between the radio and sub-mm data at the same resolution suggests that E1, E2, E3, CR1 and CR2 are associated with the sub-mm emission. Conclusions. The radio observations presented in this paper provide strong observational evidence in favour of the merger hypothesis. However, the question if RJ is also contributing to the observed sub-mm emission remains open. These results illustrate the promising prospects for radio interferometry and strong gravitational lensing to study the internal structure of SMGs.

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Section: Catalog Of Radio Sourcessupporting

confidence: 69%

Section: Fig 1 Summary Of the Results Presented Inmentioning

confidence: 99%

Section: B-array Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radio counterpart of the lensed submm emission in the cluster MS0451.6-0305: new evidence for the merger scenario

Alba

Koopmans²,

Garrett³

et al. 2010

A&A

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“…Clearly, this emphasises that we need much larger samples before we arrive at a firm conclusion. MACS J1149.5+2223 (see details in Smith et al 2009), MACS J0454.1-0300 (Berciano Alba et al 2007, and MACS J1423.8+2404 . We use these models fully consistently with the analysis made on the Z reconstructions, to derive measurements of the Einstein rings and of the lensing cross sections.…”

Section: Discussionmentioning

confidence: 99%

Comparison of an X-ray-selected sample of massive lensing clusters with the MareNostrum Universe ΛCDM simulation

Meneghetti

Fedeli

Zitrin

et al. 2011

A&A

123

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Context. A long-standing problem of strong-lensing by galaxy clusters is the observed high rate of giant gravitational arcs that are not predicted in the framework of the "standard" cosmological model. This is known as the "arc statistics problem". Recently, several other inconsistencies between the theoretical expectations and observations have been claimed regarding the large size of the Einstein rings and the high concentrations of few clusters with strong-lensing features. All these problems consistently indicate that observed galaxy clusters may be stronger gravitational lenses than expected. Aims. We aim at better understanding these problems by comparing the lensing properties of well defined cluster samples with those of a large set of numerically simulated objects. Methods. We use clusters extracted from the MareNostrum Universe to build up mock catalogs of galaxy clusters selected through their X-ray flux. We use these objects to estimate the probability distributions of lensing cross sections, Einstein rings, and concentrations for a sample of 12 MACS clusters at z > 0.5 from the literature. Results. We find that three clusters in the MACS sample have lensing cross sections and Einstein ring sizes larger than any simulated cluster in the MareNostrum Universe. We use the lensing cross sections of simulated and real clusters to estimate the number of giant arcs that should arise from lensed sources at z = 2. We find that simulated clusters produce ∼50% less arcs than observed clusters do. The medians of the distributions of the Einstein ring sizes differ by ∼25% between simulations and observations. We estimate that the concentrations of the individual MACS clusters inferred from the lensing analysis should be up to a factor of ∼2 larger than expected from the ΛCDM model because of cluster triaxiality and orientation biases that affect the lenses with the largest cross sections. In particular, we predict that for ∼20% of the clusters in the MACS sample the lensing-derived concentrations should be higher than expected by more than ∼40%. Conclusions. The arc statistics, the Einstein ring, and the concentration problems in strong lensing clusters are mitigated but not solved on the basis of our analysis. Nevertheless, owing to the lack of redshifts for most of the multiple image systems used for modeling the MACS clusters, the results of this work will need to be verified with additional data. The upcoming CLASH program will provide an ideal sample for extending our comparison.

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A systematic review of strong gravitational lens modeling software

Lefor

Futamase

Akhlaghi

2013

New Astronomy Reviews

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Despite expanding research activity in gravitational lens modeling, there is no particular software which is considered a standard. Much of the gravitational lens modeling software is written by individual investigators for their own use. Some gravitational lens modeling software is freely available for download but is widely variable with regard to ease of use and quality of documentation. This review of 13 software packages was undertaken to provide a single source of information. Gravitational lens models are classified as parametric models or non-parametric models, and can be further divided into research and educational software. Software used in research includes the GRAVLENS package (with both gravlens and lensmodel), Lenstool, LensPerfect, glafic, PixeLens, SimpLens, Lensview, and GRALE. In this review, GravLensHD, G-Lens, Gravitational Lensing, lens and MOWGLI are categorized as educational programs that are useful for demonstrating various aspects of lensing. Each of the 13 software packages is reviewed with regard to software features (installation, documentation, files provided, etc.) and lensing features (type of model, input data, output data, etc.) as well as a brief review of studies where they have been used. Recent studies have demonstrated the utility of strong gravitational lensing data for mass mapping, and suggest increased use of these techniques in the future. Coupled with the advent of greatly improved imaging, new approaches to modeling of strong gravitational lens systems are needed. This is the first systematic review of strong gravitational lens modeling software, providing investigators with a starting point for future software development to further advance gravitational lens modeling research.

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Highly-magnified, multiply-imaged radio counterparts of the sub-mm starburst emission in the cluster-lens MS0451.6-0305

Cited by 11 publications

References 31 publications

Radio counterpart of the lensed submm emission in the cluster MS0451.6-0305: new evidence for the merger scenario

Radio counterpart of the lensed submm emission in the cluster MS0451.6-0305: new evidence for the merger scenario

Comparison of an X-ray-selected sample of massive lensing clusters with the MareNostrum Universe ΛCDM simulation

A systematic review of strong gravitational lens modeling software

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