Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Alexey Vikhlinin"'
Autor:
Michelle Ntampaka, Alexey Vikhlinin
We present a deep machine learning (ML) approach to constraining cosmological parameters with multi-wavelength observations of galaxy clusters. The ML approach has two components: an encoder that builds a compressed representation of each galaxy clus
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::33a9dfb03a81417e998f123a6a9a667d
http://arxiv.org/abs/2112.05768
http://arxiv.org/abs/2112.05768
Autor:
I. Bartalucci, Monique Arnaud, Alexey Vikhlinin, Felipe Andrade-Santos, Christine Jones, Stephen S. Murray, Reinout J. van Weeren, Lorenzo Lovisari, Jean-Baptiste Melin, Pasquale Mazzotta, William R. Forman, Ralph P. Kraft, Gabriel W. Pratt, Laurence P. David, Stefano Borgani, Etienne Pointecouteau, Simona Giacintucci
Publikováno v:
Astrophys.J.
Astrophys.J., 2021, 914 (1), pp.58. ⟨10.3847/1538-4357/abf73e⟩
The Astrophysical Journal, 914(1)
Astrophys.J., 2021, 914 (1), pp.58. ⟨10.3847/1538-4357/abf73e⟩
The Astrophysical Journal, 914(1)
Using Chandra observations, we derive the Y-X proxy and associated total mass measurement, M-500(YX), for 147 clusters with z < 0.35 from the Planck early Sunyaev-Zeldovich catalog, and for 80 clusters with z < 0.22 from an X-ray flux-limited sample.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::274cd794c96a62e51289d73b9396f801
https://hdl.handle.net/1887/3256764
https://hdl.handle.net/1887/3256764
Autor:
Christine Jones, William R. Forman, Daisuke Nagai, Chong Ge, Neelima Sehgal, Ming Sun, Alexey Vikhlinin, Eduardo Rozo
We use a complete sample of 38 richest maxBCG clusters to study the ICM-galaxy scaling relations and the halo mass selection properties of the maxBCG algorithm, based on X-ray and optical observations. The clusters are selected from the two largest b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::426a55bc04687b549cb794d74d65551e
Autor:
Michelle Ntampaka, Ruediger Pakmor, Mark Vogelsberger, Daisuke Nagai, Annalisa Pillepich, Paul Torrey, Lars Hernquist, Federico Marinacci, Alexey Vikhlinin, Dylan Nelson, Daniel J. Eisenstein, J. ZuHone
Publikováno v:
The Astrophysical Journal
We present a machine-learning approach for estimating galaxy cluster masses from Chandra mock images. We utilize a Convolutional Neural Network (CNN), a deep machine learning tool commonly used in image recognition tasks. The CNN is trained and teste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb14e0d72b5a6f3a3471a544913288cf
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 450:1984-1989
Scaling relations in the LCDM Cosmology predict that for a given mass the clusters formed at larger redshift are hotter, denser and therefore more luminous in X-rays than their local z~0 counterparts. This effect overturns the decrease in the observa
Autor:
Paul Nulsen, Megan Donahue, William A. Dawson, Tony Mroczkowski, E. M. Churazov, Felipe Andrade-Santos, Alexey Vikhlinin, Georgiana A. Ogrean, Esra Bulbul, R. J. van Weeren, Jack Sayers, Annalisa Bonafede, Ralph P. Kraft, William R. Forman, Keiichi Umetsu, Connor J. J. Pearce, Scott W. Randall, Elke Roediger, Julian Merten, Adi Zitrin, Marcus Brüggen, Laurence P. David, Andy D. Goulding, Tracy Clarke, Piero Rosati, B. Mason, Christine Jones
Publikováno v:
The Astrophysical Journal, 835(2), 197
To investigate the relationship between thermal and non-thermal components in merger galaxy clusters, we present deep JVLA and Chandra observations of the HST Frontier Fields cluster MACS J0717.5+3745. The Chandra image shows a complex merger event,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87781228acbd8f0487b16b2aca824c3d
https://arxiv.org/abs/1701.04096
https://arxiv.org/abs/1701.04096
Autor:
Christine Jones, Shea Brown, Ralph P. Kraft, Reinout J. van Weeren, Marian Douspis, Håkon Dahle, Tracy E. Clarke, Hans Böhringer, Stefano Borgani, J. Démoclès, Pasquale Mazzotta, Monique Arnaud, Gabriel W. Pratt, Simona Giacintucci, Nabila Aghanim, Gayoung Chon, Alexey Vikhlinin, Stephen S. Murray, Lorenzo Lovisari, Felipe Andrade-Santos, Elena Rasia, William R. Forman, Laurence P. David, Etienne Pointecouteau
Publikováno v:
Astrophys.J.
Astrophys.J., 2017, 843 (1), pp.76. ⟨10.3847/1538-4357/aa7461⟩
Astrophys.J., 2017, 843 (1), pp.76. 〈10.3847/1538-4357/aa7461〉
The Astrophysical Journal, 843(1), 76
Astrophys.J., 2017, 843 (1), pp.76. ⟨10.3847/1538-4357/aa7461⟩
Astrophys.J., 2017, 843 (1), pp.76. 〈10.3847/1538-4357/aa7461〉
The Astrophysical Journal, 843(1), 76
We derive and compare the fractions of cool-core clusters in the {\em Planck} Early Sunyaev-Zel'dovich sample of 164 clusters with $z \leq 0.35$ and in a flux-limited X-ray sample of 100 clusters with $z \leq 0.30$, using {\em Chandra} observations.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb10e776adc2b4875d0324e5bf292f3a
http://hdl.handle.net/2108/194498
http://hdl.handle.net/2108/194498
Autor:
Felipe Andrade-Santos, Christine Jones, Alexey Vikhlinin, William R. Forman, Monique Arnaud, G. W. Pratt, Etienne Pointecouteau, Pasquale Mazzotta, I. Bartalucci
Publikováno v:
Astron.Astrophys.
Astron.Astrophys., 2017, 608, pp.A88. ⟨10.1051/0004-6361/201731689⟩
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2017, 608, pp.A88. ⟨10.1051/0004-6361/201731689⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 608, pp.A88. ⟨10.1051/0004-6361/201731689⟩
Astron.Astrophys., 2017, 608, pp.A88. 〈10.1051/0004-6361/201731689〉
Astron.Astrophys., 2017, 608, pp.A88. ⟨10.1051/0004-6361/201731689⟩
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2017, 608, pp.A88. ⟨10.1051/0004-6361/201731689⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 608, pp.A88. ⟨10.1051/0004-6361/201731689⟩
Astron.Astrophys., 2017, 608, pp.A88. 〈10.1051/0004-6361/201731689〉
We examine the reconstruction of galaxy cluster radial density profiles obtained from Chandra and XMM X-ray observations, using high quality data for a sample of twelve objects covering a range of morphologies and redshifts. By comparing the results
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0873489420a7fca8739132fd5ec5e6fa
https://hal.archives-ouvertes.fr/hal-01669518
https://hal.archives-ouvertes.fr/hal-01669518
Autor:
Allan Hornstrup, R. A. Burenin, Siwei Zou, Alexey Vikhlinin, Paul Giles, Florian Pacaud, Ben J Maughan
Publikováno v:
Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2016, 463 (1), pp.820-831. 〈10.1093/mnras/stw1992〉
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2016, 463 (1), pp.820-831. ⟨10.1093/mnras/stw1992⟩
Mon.Not.Roy.Astron.Soc., 2016, 463 (1), pp.820-831. ⟨10.1093/mnras/stw1992⟩
Zou, S, Maughan, B J, Giles, P A, Vikhlinin, A, Pacaud, F, Burenin, R & Hornstrup, A 2016, ' The X-ray luminosity-temperature relation of a complete sample of low-mass galaxy clusters ', Monthly Notices of the Royal Astronomical Society, vol. 463, no. 1, pp. 820-31 . https://doi.org/10.1093/mnras/stw1992
Zou, S, Maughan, B J, Giles, P A, Vikhlinin, A, Pacaud, F, Burenin, R & Hornstrup, A 2016, ' The X-ray luminosity-temperature relation of a complete sample of low-mass galaxy clusters ', Monthly Notices of the Royal Astronomical Society, vol. 463, no. 1, pp. 820-831 . https://doi.org/10.1093/mnras/stw1992
Mon.Not.Roy.Astron.Soc., 2016, 463 (1), pp.820-831. 〈10.1093/mnras/stw1992〉
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2016, 463 (1), pp.820-831. ⟨10.1093/mnras/stw1992⟩
Mon.Not.Roy.Astron.Soc., 2016, 463 (1), pp.820-831. ⟨10.1093/mnras/stw1992⟩
Zou, S, Maughan, B J, Giles, P A, Vikhlinin, A, Pacaud, F, Burenin, R & Hornstrup, A 2016, ' The X-ray luminosity-temperature relation of a complete sample of low-mass galaxy clusters ', Monthly Notices of the Royal Astronomical Society, vol. 463, no. 1, pp. 820-31 . https://doi.org/10.1093/mnras/stw1992
Zou, S, Maughan, B J, Giles, P A, Vikhlinin, A, Pacaud, F, Burenin, R & Hornstrup, A 2016, ' The X-ray luminosity-temperature relation of a complete sample of low-mass galaxy clusters ', Monthly Notices of the Royal Astronomical Society, vol. 463, no. 1, pp. 820-831 . https://doi.org/10.1093/mnras/stw1992
We present \Chandra\ observations of 23 galaxy groups and low-mass galaxy clusters at $0.03
Comment: 14 pages, 11 figures, 7 tables
Comment: 14 pages, 11 figures, 7 tables
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc818d03e1ceff8f090e617318497e05
http://arxiv.org/abs/1610.07674
http://arxiv.org/abs/1610.07674
Autor:
E. M. Churazov, P. Arévalo, Alexey Vikhlinin, William R. Forman, Alexander Schekochihin, Irina Zhuravleva, C. Jones
We discuss a novel technique of manipulating X-ray images of galaxy clusters to reveal the nature of small-scale density/temperature perturbations in the intra cluster medium (ICM). As we show, this technique can be used to differentiate between soun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7962c8212cc605ea722e1b916f743dad
http://arxiv.org/abs/1605.08999
http://arxiv.org/abs/1605.08999