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MODELING OF THE HERMES SUBMILLIMETER SOURCE LENSED BY A DARK MATTER DOMINATED FOREGROUND GROUP OF GALAXIES

R. Gavazzi, A. Cooray, A. Conley, J. E. Aguirre, A. Amblard, R. Auld, A. Beelen, A. Blain, R. Blundell, J. Bock, C. M. Bradford, C. Bridge (+76 others)
2011 Astrophysical Journal  

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2011 pre-print
arXiv:1104.4119v1 fatcat:tbybbozeifdlxpxti3l32244zm
We present the results of a gravitational lensing analysis of the bright =2.957 sub-millimeter galaxy (SMG), HERMES J105751.1+573027 found in Herschel/SPIRE Science Demonstration Phase data from the Herschel Multi-tiered Extragalactic Survey (HerMES) project. The high resolution imaging available in optical and Near-IR channels, along with CO emission obtained with the Plateau de Bure Interferometer, allow us to precisely estimate the intrinsic source extension and hence estimate the total
more » ... ng magnification to be μ=10.9± 0.7. We measure the half-light radius R_ eff of the source in the rest-frame Near-UV and V bands that characterize the unobscured light coming from stars and find R_ eff,*= [2.0 ± 0.1] kpc, in good agreement with recent studies on the Submillimeter Galaxy population. This lens model is also used to estimate the size of the gas distribution (R_ eff,gas= [1.1±0.5]) kpc by mapping back in the source plane the CO (J=5-4) transition line emission. The lens modeling yields a relatively large Einstein radius R_ Ein= 410 ± 002, corresponding to a deflector velocity dispersion of [483± 16] . This shows that HERMES J105751.1+573027 is lensed by a galaxy group-size dark matter halo at redshift ∼ 0.6. The projected dark matter contribution largely dominates the mass budget within the Einstein radius with f_ dm(<R_ Ein)∼ 80 reduces to f_ dm(<R_ eff,G1≃ 4.5)∼ 47 effective radius of the main deflecting galaxy of stellar mass M_ *,G1=[8.5± 1.6] × 10^11. At this smaller scale the dark matter fraction is consistent with results already found for massive lensing ellipticals at z∼0.2 from the SLACS survey.
doi:10.1088/0004-637x/738/2/125 fatcat:l3qsupxtqnc7fib5ai34sxiivy
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R. Gavazzi, A. Cooray, A. Conley, J. E. Aguirre, A. Amblard, R. Auld, A. Beelen, A. Blain, R. Blundell, J. Bock, C. M. Bradford, C. Bridge, D. Brisbin, D. Burgarella, P. Chanial, E. Chapin, N. Christopher, D. L. Clements, P. Cox, S. G. Djorgovski, C. D. Dowell, S. Eales, L. Earle, T. P. Ellsworth-Bowers, D. Farrah, A. Franceschini, H. Fu, J. Glenn, E. A. González Solares, M. Griffin, M. A. Gurwell, M. Halpern, E. Ibar, R. J. Ivison, M. Jarvis, J. Kamenetzky, S. Kim, M. Krips, L. Levenson, R. Lupu, A. Mahabal, P. D. Maloney, C. Maraston, L. Marchetti, G. Marsden, H. Matsuhara, A. M. J. Mortier, E. Murphy, B. J. Naylor, R. Neri, H. T. Nguyen, S. J. Oliver, A. Omont, M. J. Page, A. Papageorgiou, C. P. Pearson, I. Pérez-Fournon, M. Pohlen, N. Rangwala, J. I. Rawlings, G. Raymond, D. Riechers, G. Rodighiero, I. G. Roseboom, M. Rowan-Robinson, B. Schulz, Douglas Scott, K. S. Scott, P. Serra, N. Seymour, D. L. Shupe, A. J. Smith, M. Symeonidis, K. E. Tugwell, M. Vaccari, E. Valiante, I. Valtchanov, A. Verma, J. D. Vieira, L. Vigroux, L. Wang, J. Wardlow, D. Wiebe, G. Wright, C. K. Xu, G. Zeimann, M. Zemcov, J. Zmuidzinas. "MODELING OF THE HERMES SUBMILLIMETER SOURCE LENSED BY A DARK MATTER DOMINATED FOREGROUND GROUP OF GALAXIES." Astrophysical Journal 738.2 (2011) 125