Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Cha, Sangjun"'
Traditional weak-lensing mass reconstruction techniques suffer from various artifacts, including noise amplification and the mass-sheet degeneracy. In Hong et al. (2021), we demonstrated that many of these pitfalls of traditional mass reconstruction
Externí odkaz:
http://arxiv.org/abs/2410.19907
SN H0pe: The First Measurement of $H_0$ from a Multiply-Imaged Type Ia Supernova, Discovered by JWST
Autor:
Pascale, Massimo, Frye, Brenda L., Pierel, Justin D. R., Chen, Wenlei, Kelly, Patrick L., Cohen, Seth H., Windhorst, Rogier A., Riess, Adam G., Kamieneski, Patrick S., Diego, Jose M., Meena, Ashish K., Cha, Sangjun, Oguri, Masamune, Zitrin, Adi, Jee, M. James, Foo, Nicholas, Leimbach, Reagen, Koekemoer, Anton M., Conselice, C. J., Dai, Liang, Goobar, Ariel, Siebert, Matthew R., Strolger, Lou, Willner, S. P.
The first James Webb Space Telescope ({\it JWST}) Near InfraRed Camera (NIRCam) imaging in the field of the galaxy cluster PLCK G165.7+67.0 ($z=0.35$) uncovered a Type Ia supernova (SN~Ia) at $z=1.78$, called ``SN H0pe." Three different images of thi
Externí odkaz:
http://arxiv.org/abs/2403.18902
Autor:
HyeongHan, Kim, Cho, Hyejeon, Jee, M. James, Wittman, David, Cha, Sangjun, Lee, Wonki, Finner, Kyle, Rajpurohit, Kamlesh, Brüggen, Marcus, Forman, William, Jones, Christine, van Weeren, Reinout, Botteon, Andrea, Lovisari, Lorenzo, Stroe, Andra, Domínguez-Fernández, Paola, O'Sullivan, Ewan, Vrtilek, Jan
Publikováno v:
2024 ApJ 962 100
The galaxy cluster Abell 746 (A746; $z$=0.214), featuring a double radio relic system, two isolated radio relics, a possible radio halo, disturbed V-shaped X-ray emission, and intricate galaxy distributions, is a unique and complex merging system. We
Externí odkaz:
http://arxiv.org/abs/2311.00643
Our concordance cosmological model predicts that galaxy clusters grow at the intersection of filaments structuring the cosmic web stretching tens of Mega parsecs. Although this hypothesis has been supported by the baryonic components, no observationa
Externí odkaz:
http://arxiv.org/abs/2310.03073
We present a new high-resolution free-form mass model of Abell 2744, combining both weak-lensing (WL) and strong-lensing (SL) datasets from JWST. The SL dataset comprises 286 multiple images, presenting the most extensive SL constraint to date for a
Externí odkaz:
http://arxiv.org/abs/2308.14805
Autor:
Cha, Sangjun, Jee, M. James
We present new strong-lensing (SL) mass reconstruction of the six Hubble Frontier Fields (HFF) clusters with the MAximum-entropy ReconStruction (${\tt MARS}$) algorithm. ${\tt MARS}$ is a new free-form inversion method, which suppresses spurious smal
Externí odkaz:
http://arxiv.org/abs/2301.08765
Autor:
Lee, Wonki, Cha, Sangjun, Jee, M. James, Nagai, Daisuke, King, Lindsay, ZuHone, John, Chadayammuri, Urmila, Felix, Sharon, Finner, Kyle
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:
http://arxiv.org/abs/2211.03892
Autor:
Cha, Sangjun, Jee, M. James
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
Externí odkaz:
http://arxiv.org/abs/2202.10489
Publikováno v:
ApJ 923, 266 (2021)
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:
http://arxiv.org/abs/2102.05403
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