Zobrazeno 1 - 10
of 2 214
pro vyhledávání: '"Bolton, James"'
Autor:
Trost, Andrea, Bolton, James S., Caputo, Andrea, Liu, Hongwan, Cristiani, Stefano, Viel, Matteo
The ultralight dark photon is a well-motivated, hypothetical dark matter candidate. In a dilute plasma, they can resonantly convert into photons, and heat up the intergalactic medium between galaxies. In this work, we explore the dark photon dark mat
Externí odkaz:
http://arxiv.org/abs/2410.02858
Autor:
Asthana, Shikhar, Haehnelt, Martin G., Kulkarni, Girish, Bolton, James S., Gaikwad, Prakash, Keating, Laura C., Puchwein, Ewald
The relative contribution of emission from stellar sources and accretion onto supermassive black holes to reionization has been brought into focus again by the apparent high abundance of faint AGN at $4\lesssim z\lesssim11$ uncovered by JWST. We inve
Externí odkaz:
http://arxiv.org/abs/2409.15453
Autor:
Feron, Jennifer, Conaboy, Luke, Bolton, James S., Chapman, Emma, Haehnelt, Martin G., Keating, Laura C., Kulkarni, Girish, Puchwein, Ewald
Recent evidence supporting reionisation ending at redshift z<6 includes the rapid redshift evolution of the mean free path for Lyman-limit photons through the intergalactic medium at 5
Externí odkaz:
http://arxiv.org/abs/2406.19184
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
Multiple observations now suggest that the hydrogen reionization may have ended well below redshift six. While there has previously been no conclusive proof of extended neutral islands in the $z < 6$ intergalactic medium, it is possible that such isl
Externí odkaz:
http://arxiv.org/abs/2405.08885
Autor:
Asthana, Shikhar, Haehnelt, Martin G., Kulkarni, Girish, Aubert, Dominique, Bolton, James S., Keating, Laura C.
Publikováno v:
MNRAS 533, 2024, 2843-2866
We present a new suite of late-end reionization simulations performed with ATON-HE, a revised version of the GPU-based radiative transfer code ATON that includes helium. The simulations are able to reproduce the Ly$\alpha$ flux distribution of the E-
Externí odkaz:
http://arxiv.org/abs/2404.06548
Autor:
Nasir, Fahad, Gaikwad, Prakash, Davies, Frederick B., Bolton, James S., Puchwein, Ewald, Bosman, Sarah E. I.
Unveiling the thermal history of the intergalactic medium (IGM) at $4 \leq z \leq 5$ holds the potential to reveal early onset HeII reionization or lingering thermal fluctuations from HI reionization. We set out to reconstruct the IGM gas properties
Externí odkaz:
http://arxiv.org/abs/2404.05794
Autor:
Khan, Nabendu Kumar, Kulkarni, Girish, Bolton, James S., Haehnelt, Martin G., Iršič, Vid, Puchwein, Ewald, Asthana, Shikhar
Confronting measurements of the Lyman-$\alpha$ forest with cosmological hydrodynamical simulations has produced stringent constraints on models of particle dark matter and the thermal and ionization state of the intergalactic medium. We investigate t
Externí odkaz:
http://arxiv.org/abs/2310.07767
Autor:
Iršič, Vid, Viel, Matteo, Haehnelt, Martin G., Bolton, James S., Molaro, Margherita, Puchwein, Ewald, Boera, Elisa, Becker, George D., Gaikwad, Prakash, Keating, Laura C., Kulkarni, Girish
Publikováno v:
Phys. Rev. D, 109, 043511 (2024)
This study introduces novel constraints on the free-streaming of thermal relic warm dark matter (WDM) from Lyman-$\alpha$ forest flux power spectra. Our analysis utilises a high-resolution, high-redshift sample of quasar spectra observed using the HI
Externí odkaz:
http://arxiv.org/abs/2309.04533
Ly$\alpha$ damping wings in the spectra of bright objects at high redshift are a useful probe of the ionization state of the intergalactic medium during the reionization epoch. It has recently been noted that, despite the inhomogeneous nature of reio
Externí odkaz:
http://arxiv.org/abs/2308.11709