Zobrazeno 1 - 10
of 6 919
pro vyhledávání: '"Frederick, B"'
Autor:
Artola, Ander, Bosman, Sarah E. I., Gaikwad, Prakash, Davies, Frederick B., Nasir, Fahad, Farina, Emanuele P., Protušová, Klaudia, Puchwein, Ewald, Spina, Benedetta
We aim to construct a machine-learning approach that allows for a pixel-by-pixel reconstruction of the intergalactic medium (IGM) density field for various warm dark matter (WDM) models using the Lyman-alpha forest. With this regression machinery, we
Externí odkaz:
http://arxiv.org/abs/2411.17853
Autor:
Schindler, Jan-Torge, Hennawi, Joseph F., Davies, Frederick B., Bosman, Sarah E. I., Endsley, Ryan, Wang, Feige, Yang, Jinyi, Barth, Aaron J., Eilers, Anna-Christina, Fan, Xiaohui, Kakiichi, Koki, Maseda, Michael, Pizzati, Elia, Nanni, Riccardo
The James Webb Space Telescope has uncovered a puzzling population of UV-faint broad-line active galactic nuclei (AGN), nicknamed ``Little Red Dots'' (LRD) owing to their compact morphology and red rest-frame optical colours. Interpreted as dust atte
Externí odkaz:
http://arxiv.org/abs/2411.11534
Autor:
Carvalho, Adolfo S., Doppmann, Greg, Westfall, Kyle B., Pelliccia, Debora, Prochaska, J. Xavier, Hennawi, Joseph, Davies, Frederick B., Brodheim, Max, Wang, Feige, Cooke, Ryan
We present a data reduction pipeline (DRP) for Keck/NIRSPEC built as an addition to the PypeIt Python package. The DRP is capable of reducing multi-order echelle data taken both before and after the detector upgrade in 2018. As part of developing the
Externí odkaz:
http://arxiv.org/abs/2410.19991
The escaping ionising efficiency from galaxies, $f_{\rm esc}\xi_{\rm ion}$, is a crucial ingredient for understanding their contribution to hydrogen reionisation, but both of its components, $f_{\rm{esc}}$ and $\xi_{\rm{ion}}$, are extremely difficul
Externí odkaz:
http://arxiv.org/abs/2409.08315
The history of reionization reflects the cumulative injection of ionizing photons by sources and the absorption of ionizing photons by sinks. The latter process is traditionally described in terms of a "clumping factor" which encodes the average quad
Externí odkaz:
http://arxiv.org/abs/2406.18186
We introduce a new approach for analyzing the IGM damping wings imprinted on the proximity zones of quasars in the epoch of reionization (EoR). Whereas past work has typically forgone the additional constraining power afforded by the blue side contin
Externí odkaz:
http://arxiv.org/abs/2406.12070
We investigate the precision with which the Lyman-$\alpha$ damping wing signature imprinted on the spectra of high-redshift quasars (QSOs) by the foreground neutral intergalactic medium (IGM) can measure the history of cosmic reionization. We leverag
Externí odkaz:
http://arxiv.org/abs/2406.12071
Autor:
Onorato, Silvia, Hennawi, Joseph F., Schindler, Jan-Torge, Yang, Jinyi, Wang, Feige, Barth, Aaron J., Bañados, Eduardo, Eilers, Anna-Christina, Bosman, Sarah E. I., Davies, Frederick B., Venemans, Bram P., Mazzucchelli, Chiara, Belladitta, Silvia, Vito, Fabio, Farina, Emanuele Paolo, Andika, Irham T., Fan, Xiaohui, Walter, Fabian, Decarli, Roberto, Onoue, Masafusa, Nanni, Riccardo
We present optical and near-infrared (NIR) spectroscopic observations for a sample of $45$ quasars at $6.50 < z \leq 7.64$ with absolute magnitudes at $1450$ {\AA} in the range $-28.82 \leq M_{1450} \leq -24.13$ and their composite spectrum. The medi
Externí odkaz:
http://arxiv.org/abs/2406.07612
Autor:
Zhu, Yongda, Becker, George D., Bosman, Sarah E. I., Cain, Christopher, Keating, Laura C., Nasir, Fahad, D'Odorico, Valentina, Bañados, Eduardo, Bian, Fuyan, Bischetti, Manuela, Bolton, James S., Chen, Huanqing, D'Aloisio, Anson, Davies, Frederick B., Davies, Rebecca L., Eilers, Anna-Christina, Fan, Xiaohui, Gaikwad, Prakash, Greig, Bradley, Haehnelt, Martin G., Kulkarni, Girish, Lai, Samuel, Puchwein, Ewald, Qin, Yuxiang, Ryan-Weber, Emma V., Satyavolu, Sindhu, Spina, Benedetta, Walter, Fabian, Wang, Feige, Wolfson, Molly, Yang, Jinyi
Recent quasar absorption line observations suggest that reionization may end as late as $z \approx 5.3$. As a means to search for large neutral hydrogen islands at $z<6$, we revisit long dark gaps in the Ly$\beta$ forest in VLT/X-Shooter and Keck/ESI
Externí odkaz:
http://arxiv.org/abs/2405.12275
Publikováno v:
A&A 688, L26 (2024)
Recent observations have positioned the endpoint of the Epoch of Reionisation (EoR) at redshift $z \sim 5.3$. However, observations of the Lyman-$\alpha$ forest have not yet been able to discern whether reionisation occurred slowly and late, with sub
Externí odkaz:
http://arxiv.org/abs/2405.12273