Zobrazeno 1 - 10
of 162
pro vyhledávání: '"Bharat Ratra"'
Publikováno v:
The Astrophysical Journal Letters, Vol 964, Iss 1, p L4 (2024)
We systematically explore the influence of the prior of the peak absolute magnitude ( M ) of Type Ia supernovae (SNe Ia) on the measurement of the Hubble constant ( H _0 ) from SNe Ia observations. We consider five different data-motivated M priors,
Externí odkaz:
https://doaj.org/article/4db993acf2664d9691531c8de5ca04b6
Autor:
Michal Zajaček, Bożena Czerny, Narayan Khadka, Mary Loli Martínez-Aldama, Raj Prince, Swayamtrupta Panda, Bharat Ratra
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 2, p 229 (2024)
In Khadka et al., a sample of X-ray-detected reverberation-mapped quasars was presented and applied for the comparison of cosmological constraints inferred using two well-established relations in active galactic nuclei—the X-ray/UV luminosity ( L _
Externí odkaz:
https://doaj.org/article/df6f045becba4b9d9388a841b9d21fc7
Autor:
Shulei Cao, Bharat Ratra
Publikováno v:
Physical Review D. 107
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2640d0c4dbac2ea5dad310a256ab16ac
https://doi.org/10.1103/physrevd.107.103521
https://doi.org/10.1103/physrevd.107.103521
Publikováno v:
Physical Review D. 107
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cc6e7da2a7592de8aa9016fa24d2b203
https://doi.org/10.1103/physrevd.107.063522
https://doi.org/10.1103/physrevd.107.063522
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 513:1985-2005
We use 118 H$\beta$ quasar (QSO) observations in the redshift range $0.0023 \leq z \leq 0.89$ to simultaneously constrain cosmological model parameters and QSO 2-parameter radius-luminosity ($R-L$) relation parameters in six different cosmological mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f30565422d784b5fad69aa66142790bd
https://doi.org/10.1093/mnras/stac914
https://doi.org/10.1093/mnras/stac914
Autor:
Bharat Ratra
Publikováno v:
Physical Review D. 106
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1669d035750de58229cf8fff52f867ca
https://doi.org/10.1103/physrevd.106.123524
https://doi.org/10.1103/physrevd.106.123524
Autor:
Bharat Ratra, Mary Loli Martínez-Aldama, Michal Zajaček, Zhefu Yu, Narayan Khadka, Bozena Czerny
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 508:4722-4737
We use 78 reverberation-measured Mg II time-lag quasars (QSOs) in the redshift range $0.0033 \leq z \leq 1.89$ to constrain cosmological parameters in six different cosmological models. The basis of our method is the use of the radius-luminosity or $
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::196d282f93f5f45e06e3522af42d5b97
https://doi.org/10.1093/mnras/stab2807
https://doi.org/10.1093/mnras/stab2807
Autor:
Bozena Czerny, Shulei Cao, Vikram Kumar Jaiswal, Vladimír Karas, Narayan Khadka, Mary Loli Martínez-Aldama, Mohammad Hassan Naddaf, Swayamtrupta Panda, Francisco Pozo Nuñez, Raj Prince, Bharat Ratra, Marzena Sniegowska, Zhefu Yu, Michal Zajaček
As Setti & Woltjer noted back in 1973, quasars could be used to construct the Hubble diagram but the actualapplication was not that straightforward. It took years to implement the idea successfully. Most of the ways to use quasars for cosmology now r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ec1cbb1ab34eef92a7e15f0024bfc153
https://doi.org/10.21203/rs.3.rs-2064605/v1
https://doi.org/10.21203/rs.3.rs-2064605/v1
Autor:
Bożena Czerny, Shulei Cao, Vikram Kumar Jaiswal, Vladimír Karas, Narayan Khadka, Mary Loli Martínez-Aldama, Mohammad Hassan Naddaf, Swayamtrupta Panda, Francisco Pozo Nuñez, Raj Prince, Bharat Ratra, Marzena Sniegowska, Zhefu Yu, Michal Zajaček
As Setti & Woltjer noted back in 1973, quasars could be used to construct the Hubble diagram but the actual application was not that straightforward. It took years to implement the idea successfully. Most of the ways to use quasars for cosmology now
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::853f57ee494ea9d7c37d82bd999de93e
http://arxiv.org/abs/2209.06563
http://arxiv.org/abs/2209.06563
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 504:300-310
We use Pantheon Type Ia supernova (SN Ia) apparent magnitude, DES-3yr binned SN Ia apparent magnitude, Hubble parameter, and baryon acoustic oscillation measurements to constrain six spatially flat and non-flat cosmological models. These sets of data
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb7996e8e7b5d637144f036a0085fed5
https://doi.org/10.1093/mnras/stab942
https://doi.org/10.1093/mnras/stab942