Zobrazeno 1 - 10
of 127
pro vyhledávání: '"Merten, Julian"'
Publikováno v:
A&A 627, A143 (2019)
Galaxy clusters provide a multitude of observational data across wavelengths and their structure and morphology are of considerable interest in cosmology as well as astrophysics. We develop a framework that allows the combination of lensing and non-l
Externí odkaz:
http://arxiv.org/abs/1812.08152
Autor:
Peel, Austin, Lalande, Florian, Starck, Jean-Luc, Pettorino, Valeria, Merten, Julian, Giocoli, Carlo, Meneghetti, Massimo, Baldi, Marco
Publikováno v:
Phys. Rev. D 100, 023508 (2019)
We present a convolutional neural network to classify distinct cosmological scenarios based on the statistically similar weak-lensing maps they generate. Modified gravity (MG) models that include massive neutrinos can mimic the standard concordance m
Externí odkaz:
http://arxiv.org/abs/1810.11030
Autor:
Merten, Julian, Giocoli, Carlo, Baldi, Marco, Meneghetti, Massimo, Peel, Austin, Lalande, Florian, Starck, Jean-Luc, Pettorino, Valeria
Based on the DUSTGRAIN-pathfinder suite of simulations, we investigate observational degeneracies between nine models of modified gravity and massive neutrinos. Three types of machine learning techniques are tested for their ability to discriminate l
Externí odkaz:
http://arxiv.org/abs/1810.11027
Weak lensing shear estimation typically results in per galaxy statistical errors significantly larger than the sought after gravitational signal of only a few percent. These statistical errors are mostly a result of shape-noise -- an estimation error
Externí odkaz:
http://arxiv.org/abs/1808.07491
Autor:
Umetsu, Keiichi, Sereno, Mauro, Tam, Sut-Ieng, Chiu, I-Non, Fan, Zuhui, Ettori, Stefano, Gruen, Daniel, Okumura, Teppei, Medezinski, Elinor, Donahue, Megan, Meneghetti, Massimo, Frye, Brenda, Koekemoer, Anton, Broadhurst, Tom, Zitrin, Adi, Balestra, Italo, Benitez, Narciso, Higuchi, Yuichi, Melchior, Peter, Mercurio, Amata, Merten, Julian, Molino, Alberto, Nonino, Mario, Postman, Marc, Rosati, Piero, Sayers, Jack, Seitz, Stella
Publikováno v:
ApJ, 860, 104 (2018)
We reconstruct the two-dimensional (2D) matter distributions in 20 high-mass galaxy clusters selected from the CLASH survey by using the new approach of performing a joint weak lensing analysis of 2D shear and azimuthally averaged magnification measu
Externí odkaz:
http://arxiv.org/abs/1804.00664
Autor:
Chiu, I-Non, Umetsu, Keiichi, Sereno, Mauro, Ettori, Stefano, Meneghetti, Massimo, Merten, Julian, Sayers, Jack, Zitrin, Adi
We perform a three-dimensional triaxial analysis of 16 X-ray regular and 4 high-magnification galaxy clusters selected from the CLASH survey by combining two-dimensional weak-lensing and central strong-lensing constraints. In a Bayesian framework, we
Externí odkaz:
http://arxiv.org/abs/1804.00676
Autor:
Martinet, Nicolas, Schneider, Peter, Hildebrandt, Hendrik, Shan, HuanYuan, Asgari, Marika, Dietrich, Jörg P., Harnois-Déraps, Joachim, Erben, Thomas, Grado, Aniello, Heymans, Catherine, Hoekstra, Henk, Klaes, Dominik, Kuijken, Konrad, Merten, Julian, Nakajima, Reiko
We study the statistics of peaks in a weak lensing reconstructed mass map of the first 450 square degrees of the Kilo Degree Survey. The map is computed with aperture masses directly applied to the shear field with an NFW-like compensated filter. We
Externí odkaz:
http://arxiv.org/abs/1709.07678
Autor:
Shan, HuanYuan, Liu, Xiangkun, Hildebrandt, Hendrik, Pan, Chuzhong, Martinet, Nicolas, Fan, Zuhui, Schneider, Peter, Asgari, Marika, Harnois-Déraps, Joachim, Hoekstra, Henk, Wright, Angus, Dietrich, Jörg P., Erben, Thomas, Getman, Fedor, Grado, Aniello, Heymans, Catherine, Klaes, Dominik, Kuijken, Konrad, Merten, Julian, Puddu, Emanuella, Radovich, Mario, Wang, Qiao
This paper is the first of a series of papers constraining cosmological parameters with weak lensing peak statistics using $\sim 450~\rm deg^2$ of imaging data from the Kilo Degree Survey (KiDS-450). We measure high signal-to-noise ratio (SNR: $\nu$)
Externí odkaz:
http://arxiv.org/abs/1709.07651
Autor:
Massey, Richard, Harvey, David, Liesenborgs, Jori, Richard, Johan, Stach, Stuart, Swinbank, Mark, Taylor, Peter, Williams, Liliya, Clowe, Douglas, Courbin, Frederic, Edge, Alastair, Israel, Holger, Jauzac, Mathilde, Joseph, Remy, Jullo, Eric, Kitching, Thomas D., Leonard, Adrienne, Merten, Julian, Nagai, Daisuke, Nightingale, James, Robertson, Andrew, Romualdez, Luis Javier, Saha, Prasenjit, Smit, Renske, Tam, Sut Ieng, Tittley, Eric
We present integral field spectroscopy of galaxy cluster Abell 3827, using ALMA and VLT/MUSE. It reveals an unusual configuration of strong gravitational lensing in the cluster core, with at least seven lensed images of a single background spiral gal
Externí odkaz:
http://arxiv.org/abs/1708.04245
Autor:
van Uitert, Edo, Joachimi, Benjamin, Joudaki, Shahab, Heymans, Catherine, Köhlinger, Fabian, Asgari, Marika, Blake, Chris, Choi, Ami, Erben, Thomas, Farrow, Daniel J., Harnois-Déraps, Joachim, Hildebrandt, Hendrik, Hoekstra, Henk, Kitching, Thomas D., Klaes, Dominik, Kuijken, Konrad, Merten, Julian, Miller, Lance, Nakajima, Reiko, Schneider, Peter, Valentijn, Edwin, Viola, Massimo
We present cosmological parameter constraints from a joint analysis of three cosmological probes: the tomographic cosmic shear signal in $\sim$450 deg$^2$ of data from the Kilo Degree Survey (KiDS), the galaxy-matter cross-correlation signal of galax
Externí odkaz:
http://arxiv.org/abs/1706.05004