Zobrazeno 1 - 10
of 29
pro vyhledávání: '"G Bargiacchi"'
Publikováno v:
The Astrophysical Journal, Vol 950, Iss 1, p 45 (2023)
Currently, the Λ cold dark matter model, which relies on the existence of cold dark matter and a cosmological constant Λ, best describes the universe. However, we lack information in the high-redshift ( z ) region between Type Ia supernovae (SNe Ia
Externí odkaz:
https://doaj.org/article/5da20dcb5c3842d89014a12f24c15eac
Autor:
G. Risaliti, E. Lusso, E. Nardini, G. Bargiacchi, S. Bisogni, A. Sacchi, M. Signorini, B. Trefoloni
In the past few years, we built a Hubble diagram of quasars up to redshift z$\sim$7, based on the nonlinear relation between quasars' x-ray and UV luminosities. Such a Hubble diagram shows a >4$\sigma$ deviation from the standard flat $\Lambda$CDM mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12946d04ff8bfae164c554b2ebcc7ece
http://arxiv.org/abs/2304.13752
http://arxiv.org/abs/2304.13752
The recent $\sim 4 \, \sigma$ Hubble constant, $H_{0}$, tension is observed between the value of $H_{0}$ from the Cosmic Microwave Background (CMB) and Type Ia Supernovae (SNe Ia). It is a decade since this tension is excruciating the modern astrophy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::86a33b636cfbc5ec47d4193d0a4ac9af
http://arxiv.org/abs/2303.07076
http://arxiv.org/abs/2303.07076
Akademický článek
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Autor:
E. Ó Colgáin, M. M. Sheikh-Jabbari, R. Solomon, G. Bargiacchi, S. Capozziello, M. G. Dainotti, D. Stojkovic
Publikováno v:
Physical Review D. 106
Emerging high redshift cosmological probes, in particular quasars (QSOs), show a preference for larger matter densities, $\Omega_{m} \approx 1$, within the flat $\Lambda$CDM framework. Here, using the Risaliti-Lusso relation for standardizable QSOs,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f0608c388969d29f573b42ad0718dc29
https://doi.org/10.1103/physrevd.106.l041301
https://doi.org/10.1103/physrevd.106.l041301
Autor:
M G Dainotti, V Nielson, G Sarracino, E Rinaldi, S Nagataki, S Capozziello, O Y Gnedin, G Bargiacchi
Gamma-Ray Bursts (GRBs), can be employed as standardized candles, extending the distance ladder beyond Supernovae Type Ia (SNe Ia, $z=2.26$). We standardize GRBs using the 3D fundamental plane relation (the Dainotti relation) among the rest-frame end
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0287ee2bcb52c2137e13024bc8827996
http://arxiv.org/abs/2203.15538
http://arxiv.org/abs/2203.15538
Akademický článek
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Autor:
M. Signorini, G. Bargiacchi, Gordon T. Richards, C. Vignali, Alessandro Marconi, A. Sacchi, Elisabeta Lusso, Susanna Bisogni, Roberto Gilli, Francesca Civano, F. Salvestrini, E. Nardini, Guido Risaliti, Giuseppina Fabbiano, Martin Elvis
We analyse the properties of the CIV broad emission line in connection with the X-ray emission of 30 bright SDSS quasars at z~3.0-3.3 with pointed XMM-Newton observations, which were selected to test the suitability of AGN as cosmological tools. In o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5527c2f50985c6b154002ab08f288d44
http://arxiv.org/abs/2107.02806
http://arxiv.org/abs/2107.02806
We analyse some open debates in cosmology in light of the most updated quasar (QSO) sample, covering a wide redshift range up to $z\sim7.5$, combined with type Ia supernovae (SNe) and baryon acoustic oscillations (BAO). Indeed, extending the cosmolog
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a5718b4efc1f1d5b3b4a4774f891c225
Akademický článek
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