Zobrazeno 1 - 10
of 163
pro vyhledávání: '"Valiante R"'
Autor:
Saccheo, I., Bongiorno, A., Piconcelli, E., Zappacosta, L., Bischetti, M., D'Odorico, V., Done, C., Temple, M. J., Testa, V., Tortosa, A., Brusa, M., Carniani, S., Civano, F., Comastri, A., Cristiani, S., De Cicco, D., Elvis, M., Fan, X., Feruglio, C., Fiore, F., Gallerani, S., Giallongo, E., Gilli, R., Grazian, A., Guainazzi, M., Haardt, F., Maiolino, R., Menci, N., Miniutti, G., Nicastro, F., Paolillo, M., Puccetti, S., Salvestrini, F., Schneider, R., Tombesi, F., Tripodi, R., Valiante, R., Vallini, L., Vanzella, E., Vietri, G., Vignali, C., Vito, F., Volonteri, M., La Franca, F.
We aim at characterizing the X-ray-to-optical/near-infrared broad-band emission of luminous QSOs in the first Gyr of cosmic evolution to understand whether they exhibit differences compared to the lower-\textit{z} QSO population. Our goal is also to
Externí odkaz:
http://arxiv.org/abs/2411.02105
Autor:
Tortosa, A., Zappacosta, L., Piconcelli, E., Bischetti, M., Done, C., Miniutti, G., Saccheo, I., Vietri, G., Bongiorno, A., Brusa, M., Carniani, S., Chilingarian, I. V., Civano, F., Cristiani, S., D'Odorico, V., Elvis, M., Fan, X., Feruglio, C., Fiore, F., Gallerani, S., Giallongo, E., Gilli, R., Grazian, A., Guainazzi, M., Haardt, F., Luminari, A., Maiolino, R., Menci, N., Nicastro, F., Petrucci, P. O., Puccetti, S., Salvestrini, F., Schneider, R., Testa, V., Tombesi, F., Tripodi, R., Valiante, R., Vallini, L., Vanzella, E., Vasylenko, A., Vignali, C., Vito, F., Volonteri, M., La Franca, F.
One of the main open questions in the field of luminous ($L_{\rm bol}>10^{47}\,\rm erg\,s^{-1}$) quasars (QSOs) at $z \gtrsim 6$ is the rapid formation ($< 1\,$Gyr) of their supermassive black holes (SMBHs). For this work we analysed the relation bet
Externí odkaz:
http://arxiv.org/abs/2410.12786
Autor:
Tripodi, R., Feruglio, C., Fiore, F., Zappacosta, L., Piconcelli, E., Bischetti, M., Bongiorno, A., Carniani, S., Civano, F., Chen, C. -C., Cristiani, S., Cupani, G., Di Mascia, F., D'Odorico, V., Fan, X., Ferrara, A., Gallerani, S., Ginolfi, M., Maiolino, R., Mainieri, V., Marconi, A., Saccheo, I., Salvestrini, F., Tortosa, A., Valiante, R.
Publikováno v:
A&A 689, A220 (2024)
We used low- to high-frequency ALMA observations to investigate the cold gas and dust in ten QSOs at $z\gtrsim 6$. Our analysis of the CO(6-5) and CO(7-6) emission lines in the selected QSOs provided insights into their molecular gas masses, which av
Externí odkaz:
http://arxiv.org/abs/2401.04211
Autor:
Zappacosta, L., Piconcelli, E., Fiore, F., Saccheo, I., Valiante, R., Vignali, C., Vito, F., Volonteri, M., Bischetti, M., Comastri, A., Done, C., Elvis, M., Giallongo, E., La Franca, F., Lanzuisi, G., Laurenti, M., Miniutti, G., Bongiorno, A., Brusa, M., Civano, F., Carniani, S., D'Odorico, V., Feruglio, C., Gallerani, S., Gilli, R., Grazian, A., Guainazzi, M., Marinucci, A., Menci, N., Middei, R., Nicastro, F., Puccetti, S., Tombesi, F., Tortosa, A., Testa, V., Vietri, G., Cristiani, S., Haardt, F., Maiolino, R., Schneider, R., Tripodi, R., Vallini, L., Vanzella, E.
Publikováno v:
A&A 678, A201 (2023)
The existence of luminous quasars (QSO) at the Epoch of Reionization (EoR; i.e. z>6) powered by supermassive black holes (SMBH) with masses $\gtrsim10^9~M_\odot$ challenges models of early SMBH formation. To shed light on the nature of these sources
Externí odkaz:
http://arxiv.org/abs/2305.02347
Autor:
Ginolfi, M., Piconcelli, E., Zappacosta, L., Jones, G. C., Pentericci, L., Maiolino, R., Travascio, A., Menci, N., Carniani, S., Rizzo, F., Battaia, F. Arrigoni, Cantalupo, S., De Breuck, C., Graziani, L., Knudsen, K., Laursen, P., Mainieri, V., Schneider, R., Stanley, F., Valiante, R., Verhamme, A.
The phase transition between galaxies and quasars is often identified with the rare population of hyper-luminous, hot dust-obscured galaxies. Galaxy formation models predict these systems to grow via mergers, that can deliver large amounts of gas tow
Externí odkaz:
http://arxiv.org/abs/2208.03248
Autor:
Fujimoto, S., Brammer, G. B., Watson, D., Magdis, G. E., Kokorev, V., Greve, T. R., Toft, S., Walter, F., Valiante, R., Ginolfi, M., Schneider, R., Valentino, F., Colina, L., Vestergaard, M., Marques-Chaves, R., Fynbo, J. P. U., Krips, M., Steinhardt, C. L., Cortzen, I., Rizzo, F., Oesch, P. A.
Understanding how super-massive black holes form and grow in the early Universe has become a major challenge since the discovery of luminous quasars only 700 million years after the Big Bang. Simulations indicate an evolutionary sequence of dust-redd
Externí odkaz:
http://arxiv.org/abs/2204.06393
Autor:
Sassano, F., Schneider, R., Valiante, R., Inayoshi, K., Chon, S., Omukai, K., Mayer, L., Capelo, P. R.
Observations of hyper-luminous quasars at $z>6$ reveal the rapid growth of supermassive black holes (SMBHs $>10^9 \rm M_{\odot}$) whose origin is still difficult to explain. Their progenitors may have formed as remnants of massive, metal free stars (
Externí odkaz:
http://arxiv.org/abs/2106.08330
We present asymptotic giant branch (AGB) models of metallicity $Z=10^{-4}$ and $Z=3\times 10^{-4}$, with the aim of understanding how the gas enrichment and the dust production change in very metal-poor environments and to assess the general contribu
Externí odkaz:
http://arxiv.org/abs/1904.11734
The hyperluminous Compton-thick $z\sim2$ quasar nucleus of the hot DOG W1835+4355 observed by NuSTAR
Autor:
Zappacosta, L., Piconcelli, E., Duras, F., Vignali, C., Valiante, R., Bianchi, S., Bongiorno, A., Fiore, F., Feruglio, C., Lanzuisi, G., Maiolino, R., Mathur, S., Miniutti, G., Ricci, C.
Publikováno v:
A&A 618, A28 (2018)
We present a 155ks NuSTAR observation of the $z\sim2$ hot dust-obscured galaxy (hot DOG) W1835+4355. We extracted spectra from the two NuSTAR detectors and analyzed them jointly with the archival XMM PN and MOS spectra. We performed a spectroscopic a
Externí odkaz:
http://arxiv.org/abs/1807.06022
Autor:
Bischetti, M., Piconcelli, E., Feruglio, C., Duras, F., Bongiorno, A., Carniani, S., Marconi, A., Pappalardo, C., Schneider, R., Travascio, A., Valiante, R., Vietri, G., Zappacosta, L., Fiore, F.
We present an ALMA high-resolution observation of the 840 um continuum and [CII] line emission in the WISE-SDSS selected hyper-luminous (WISSH) QSO J1015+0020 at z~4.4. Our analysis reveals an exceptional overdensity of [CII]-emitting companions with
Externí odkaz:
http://arxiv.org/abs/1804.06399