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@Article{DurretMAACCMSU:2016:SeFiLa,
               author = "Durret, F. and M{\'a}rquez, I. and Acebr{\'o}n, A. and Adami, C. 
                         and Cabrera-Lavers, A. and Capelato, Hugo Vicente and Martinet, N. 
                         and Sarron, F. and Ulmer, M. P.",
          affiliation = "{Sorbonne Universit{\'e}s} and {Instituto de Astrof{\'{\i}}sica 
                         de Andaluc{\'{\i}}a} and {Aix Marseille Universit{\'e}} and 
                         {Aix Marseille Universit{\'e}} and {Instituto de 
                         Astrof{\'{\i}}sica de Canarias} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Sorbonne Universit{\'e}s} and 
                         {Sorbonne Universit{\'e}s} and {Northwestern University}",
                title = "Searching for filaments and large-scale structure around DAFT/FADA 
                         clusters",
              journal = "Astronomy and Astrophysics",
                 year = "2016",
               volume = "588",
                pages = "A69",
                month = "Apr.",
             keywords = "Galaxies: clusters: general, Large scale structure of Universe.",
             abstract = "Context. Clusters of galaxies are located at the intersection of 
                         cosmic filaments and are still accreting galaxies and groups along 
                         these preferential directions. However, because of their 
                         relatively low contrast on the sky, filaments are difficult to 
                         detect (unless a large amount of spectroscopic data are 
                         available), and unambiguous detections have been limited until now 
                         to relatively low redshifts (z< \∼ 0.3). Aims. This project 
                         is aimed at searching for extensions and filaments around 
                         clusters, traced by galaxies selected to be at the cluster 
                         redshift based on the red sequence. In the 0.4 <z< 0.9 redshift 
                         range of our sample, clusters are believed to be already well 
                         formed, but still to be accreting material along filaments. 
                         Methods. We have searched for extensions and filaments around the 
                         thirty clusters of the DAFT/FADA survey for which we had deep wide 
                         field photometric data. For each cluster, based on a 
                         colour-magnitude diagram, we selected galaxies that were likely to 
                         belong to the red sequence, and hence to be at the cluster 
                         redshift, and built density maps. By computing the background for 
                         each of these maps and drawing 3\σ contours, we estimated 
                         the elongations of the structures detected in this way. Whenever 
                         possible, we identified the other structures detected on the 
                         density maps with clusters listed in NED. Results. We find clear 
                         elongations in twelve clusters out of thirty, with sizes that can 
                         reach up to 7.6 Mpc. Eleven other clusters have neighbouring 
                         structures, but the zones linking them are not detected in the 
                         density maps at a 3\σ level. Three clusters show no extended 
                         structure and no neighbours, and four clusters are of too low 
                         contrast to be clearly visible on our density maps. Conclusions. 
                         The simple method we have applied appears to work well to show the 
                         existence of filaments and/or extensions around a number of 
                         clusters in the redshift range 0.4 <z< 0.9. We plan to apply it to 
                         other large cluster samples such as the clusters detected in the 
                         CFHTLS and SDSS-Stripe 82 surveys in the near future.",
                  doi = "10.1051/0004-6361/201527655",
                  url = "http://dx.doi.org/10.1051/0004-6361/201527655",
                 issn = "0004-6361 and 1432-0746",
             language = "en",
           targetfile = "1_durret_searching.pdf",
        urlaccessdate = "29 nov. 2020"
}


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