Zobrazeno 1 - 10
of 857
pro vyhledávání: '"Risaliti, G."'
Autor:
Margutti, Raffaella, Kamble, A., Milisavljevic, D., Zapartas, E., de Mink, S. E., Drout, M., Chornock, R., Risaliti, G., Zauderer, B. A., Bietenholz, M., Cantiello, M., Chakraborti, S., Chomiuk, L., Fong, W., Grefenstette, B., Guidorzi, C., Kirshner, R., Parrent, J. T., Patnaude, D., Soderberg, A. M., Gehrels, N. C., Harrison, F.
We present multi-wavelength observations of SN 2014C during the first 500 days. These observations represent the first solid detection of a young extragalactic stripped-envelope SN out to high-energy X-rays similar to 40 keV. SN 2014C shows ordinary
Externí odkaz:
http://hdl.handle.net/10150/624387
http://arizona.openrepository.com/arizona/handle/10150/624387
http://arizona.openrepository.com/arizona/handle/10150/624387
A Hubble diagram (HD) has recently been constructed in the redshift range $0\lesssim z\lesssim 6.5$ using a non-linear relation between the ultraviolet and X-ray luminosities of QSOs. The Type Ia SN HD has already provided a high-precision test of co
Externí odkaz:
http://hdl.handle.net/10150/615119
http://arizona.openrepository.com/arizona/handle/10150/615119
http://arizona.openrepository.com/arizona/handle/10150/615119
Autor:
Sacchi, A., Risaliti, G., Signorini, M., Lusso, E., Nardini, E., Bargiacchi, G., Bisogni, S., Civano, F., Elvis, M., Fabbiano, G., Gilli, R., Trefoloni, B., Vignali, C.
Publikováno v:
A&A 663, L7 (2022)
The non-linear relation between the X-ray and ultraviolet (UV) luminosity in quasars has been used to derive quasar distances and to build a Hubble diagram at redshifts up to $z\sim$ 7. This cosmological application is based on the assumption of inde
Externí odkaz:
http://arxiv.org/abs/2206.13528
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:
http://arxiv.org/abs/2111.02420
Autor:
Bargiacchi, Giada, Risaliti, G., Benetti, M., Capozziello, S., Lusso, E., Saccardi, A., Signorini, M.
Publikováno v:
A&A 649, A65 (2021)
Cosmography is a powerful tool to investigate the Universe kinematic and then to reconstruct dynamics in a model-independent way. However, recent new measurements of supernovae Ia and quasars have populated the Hubble diagram up to high redshifts ($z
Externí odkaz:
http://arxiv.org/abs/2101.08278
Autor:
Lusso, E., Risaliti, G., Nardini, E., Bargiacchi, G., Benetti, M., Bisogni, S., Capozziello, S., Civano, F., Eggleston, L., Elvis, M., Fabbiano, G., Gilli, R., Marconi, A., Paolillo, M., Piedipalumbo, E., Salvestrini, F., Signorini, M., Vignali, C.
Publikováno v:
A&A 642, A150 (2020)
We present a new catalogue of ~2,400 optically selected quasars with spectroscopic redshifts and X-ray observations from either Chandra or XMM-Newton. The sample can be used to investigate the non-linear relation between the UV and X-ray luminosity o
Externí odkaz:
http://arxiv.org/abs/2008.08586
Autor:
Kammoun, E. S., Nardini, E., Zoghbi, A., Miller., J. M., Cackett, E. M., Gallo, E., Reynolds, M. T., Risaliti, G., Barret, D., Brandt, W. N., Brenneman, L. W., Kaastra, J. S., Koss, M., Lohfink, A. M., Mushotzky, R. F., Raymond, J., Stern, D.
We present a flux-resolved X-ray analysis of the dwarf Seyfert 1.8 galaxy NGC 4395, based on three archival $XMM-Newton$ and one archival $NuSTAR$ observations. The source is known to harbor a low mass black hole ($\sim 10^4- {\rm a~ few~}\times 10^{
Externí odkaz:
http://arxiv.org/abs/1910.11317
Autor:
Nardini, E., Lusso, E., Risaliti, G., Bisogni, S., Civano, F., Elvis, M., Fabbiano, G., Gilli, R., Marconi, A., Salvestrini, F., Vignali, C.
Publikováno v:
A&A 632, A109 (2019)
(abridged) We present the X-ray analysis of a sample of 30 luminous quasars at $z\simeq3.0-3.3$ with deep XMM-Newton observations, selected from the SDSS-DR7 to be representative of the most luminous, intrinsically blue quasar population. By construc
Externí odkaz:
http://arxiv.org/abs/1910.04604
Publikováno v:
A&A 628, L4 (2019)
In the current framework, the standard parametrization of our Universe is the so-called Lambda Cold Dark Matter ({\Lambda}CDM) model. Recently, Risaliti & Lusso (2019) have shown a ~4{\sigma} tension with the {\Lambda}CDM model through a model-indepe
Externí odkaz:
http://arxiv.org/abs/1907.07692
Autor:
Fabbiano, G., Elvis, M., Accomazzi, A., Berriman, G. B., Brickhouse, N., Bose, S., Carrera, D., Chilingarian, I., Civano, F., Czerny, B., D'Abrusco, R., Diemer, B., Drake, J., Meibody, R. Emami, Farah, J. R., Fazio, G. G., Feigelson, E., Fornasini, F., Gallagher, Jay, Grindlay, J., Hernquist, L., James, D. J., Karovska, M., Kashyap, V., Kim, D. -W., Lacy, G. M., Lazio, J., Lusso, E., Maksym, W. P., Galarza, R. Martinez, Mazzarella, J., Ntampaka, M., Risaliti, G., Sanders, D., Scoville, N., Shapiro, I., Siemiginowska, A., Smth, A., Smith, S., Szentgyorgyi, A., Tacchella, S., Thakar, A., Tolls, V., Vrtilek, S., Wilkes, B., Wilner, D., Willner, S. P., Wolk, S. J., Zhao, J. -H.
We write in response to the call from the 2020 Decadal Survey to submit white papers illustrating the most pressing scientific questions in astrophysics for the coming decade. We propose exploration as the central question for the Decadal Committee's
Externí odkaz:
http://arxiv.org/abs/1903.06634