Zobrazeno 1 - 10
of 974
pro vyhledávání: '"Madau, P."'
Autor:
Madau, Piero, Haardt, Francesco
A simple model for the X-ray weakness of JWST-selected broad-line AGNs is proposed under the assumption that the majority of these sources are fed at super-Eddington accretion rates. In these conditions, the hot inner corona above the geometrically t
Externí odkaz:
http://arxiv.org/abs/2410.00417
Deep surveys with the James Webb Space Telescope (JWST) have revealed an emergent population of moderate-luminosity, broad-line active galactic nuclei (AGNs) at 4< z< 14 powered by accretion onto early massive black holes. The high number densities r
Externí odkaz:
http://arxiv.org/abs/2406.18697
Recent observations with JWST and ALMA have unveiled galaxies with regular discs at significantly higher redshifts than previously expected. This appears to be in contrast with constraints on the stellar populations of the Milky Way, suggesting that
Externí odkaz:
http://arxiv.org/abs/2406.11960
Intermediate mass black holes (IMBHs) may be the link between stellar mass holes and the supermassive variety in the nuclei of galaxies, and globular clusters (GCs) may be one of the most promising environments for their formation. Here we carry out
Externí odkaz:
http://arxiv.org/abs/2312.11887
We present new measurements of the mean transmitted flux in the hydrogen Ly$\rm \alpha$ and a relative transmitted flux measurement in Ly$\rm \beta$ using 27,008 quasar spectra from the Fourteenth Data Release (DR14) of the Extended Baryon Oscillatio
Externí odkaz:
http://arxiv.org/abs/2310.00524
Autor:
Madau, Piero
We introduce a mathematical framework for statistical exoplanet population and astrobiology studies that may help directing future observational efforts and experiments. The approach is based on a set of differential equations and provides a time-dep
Externí odkaz:
http://arxiv.org/abs/2309.11927
Publikováno v:
Parasites & Vectors, Vol 17, Iss 1, Pp 1-17 (2024)
Abstract Background Taenia multiceps coenurosis is endemic in sheep from various regions worldwide. Dogs, the key hosts, shed T. multiceps eggs in their feces contaminating the pasture, and lambs are mostly infected during their first turnout into pa
Externí odkaz:
https://doaj.org/article/bf74af72eab04fa3a1c0a23afc9cdfbe
The presence of cold ($T \lesssim 10^4$ K) gas in the circumgalactic medium (CGM) of galaxies has been confirmed both in observations and high-resolution simulations, but its origin still represents a puzzle. Possible mechanisms are cold accretion fr
Externí odkaz:
http://arxiv.org/abs/2306.03146
Autor:
Schimek, Alice, Decataldo, Davide, Shen, Sijing, Cicone, Claudia, Baumschlager, Bernhard, van Kampen, Eelco, Klaassen, Pamela, Madau, Piero, Di Mascolo, Luca, Mayer, Lucio, Arroyave, Isabel Montoya, Mroczkowski, Tony, Warraich, Jessie Harvir Kaur
Publikováno v:
A&A 682, A98 (2024)
The circumgalactic medium (CGM) is a crucial component of galaxy evolution, but thus far its physical properties are highly unconstrained. As of yet, no cosmological simulation has reached convergence when it comes to constraining the cold and dense
Externí odkaz:
http://arxiv.org/abs/2306.00583
Autor:
Hassan, Sultan, Lovell, Christopher C., Madau, Piero, Huertas-Company, Marc, Somerville, Rachel S., Burkhart, Blakesley, Dixon, Keri L., Feldmann, Robert, Starkenburg, Tjitske K., Wu, John F., Jespersen, Christian Kragh, Gelfand, Joseph D., Bera, Ankita
An unprecedented array of new observational capabilities are starting to yield key constraints on models of the epoch of first light in the Universe. In this Letter we discuss the implications of the UV radiation background at cosmic dawn inferred by
Externí odkaz:
http://arxiv.org/abs/2305.02703