Zobrazeno 1 - 7
of 7
pro vyhledávání: '"Sangjun Cha"'
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 2, p 186 (2024)
We present a new high-resolution free-form mass model of A2744 that combines both weak-lensing (WL) and strong-lensing (SL) data sets from JWST. The SL data set comprises 286 multiple images, presenting the most extensive SL constraint to date for a
Externí odkaz:
https://doaj.org/article/11c2a11e734747a4845fed40d270d8f8
Autor:
Sangjun Cha, M. James Jee
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 2, p 140 (2023)
We present a new strong-lensing (SL) mass reconstruction of the six Hubble Frontier Fields (HFF) clusters with the MAximum-entropy ReconStruction ( MARS ) algorithm. MARS is a new free-form inversion method, which suppresses spurious small-scale fluc
Externí odkaz:
https://doaj.org/article/d87d7e9cb64c4d58b1cd0d8ad05aa5b2
Autor:
Wonki Lee, Sangjun Cha, M. James Jee, Daisuke Nagai, Lindsay King, John ZuHone, Urmila Chadayammuri, Sharon Felix, Kyle Finner
Publikováno v:
The Astrophysical Journal, Vol 945, Iss 1, p 71 (2023)
Although weak lensing (WL) is a powerful method to estimate a galaxy cluster mass without any dynamical assumptions, a model bias can arise when the cluster density profile departs from the assumed model profile. In a merging system, the bias is expe
Externí odkaz:
https://doaj.org/article/03b6d9848a414a639bbe59516a38aa2d
Autor:
Myungkook Jee, Sangjun Cha
Publikováno v:
The Astrophysical Journal. 931:127
Free-form strong-lensing (SL) mass reconstructions typically suffer from overfitting, which manifest itself as false-positive small-scale fluctuations. We present a new free-form MAximum-entropy ReconStruction (${\tt MARS}$) method without the assump
We introduce a novel method for reconstructing the projected matter distributions of galaxy clusters with weak-lensing (WL) data based on convolutional neural network (CNN). Training datasets are generated with ray-tracing through cosmological simula
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::23299e20bc4472ce112fec0cfc8a1668
Publikováno v:
Proceedings of the International Astronomical Union. Dec2022, Vol. 18 Issue S381, pf1-f15. 15p.
Publikováno v:
Nature Astronomy; Mar2024, Vol. 8 Issue 3, p377-383, 7p