Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Belladitta, Silvia"'
Autor:
Banados, Eduardo, Momjian, Emmanuel, Connor, Thomas, Belladitta, Silvia, Decarli, Roberto, Mazzucchelli, Chiara, Venemans, Bram P., Walter, Fabian, Wang, Feige, Xie, Zhang-Liang, Barth, Aaron J., Eilers, Anna-Christina, Fan, Xiaohui, Khusanova, Yana, Schindler, Jan-Torge, Stern, Daniel, Yang, Jinyi, Andika, Irham Taufik, Carilli, Chris, Farina, Emanuele P., Fabian, Andrew, Hennawi, Joseph F., Pensabene, Antonio, Rojas-Ruiz, Sofia
Relativistic jets are thought to play a crucial role in the formation of massive galaxies and supermassive black holes. Here we report multi-wavelength and multi-epoch observations of the quasar VLASSJ0410-0139 at redshift z=7, powered by a 7e8 solar
Externí odkaz:
http://arxiv.org/abs/2407.07236
Autor:
Onorato, Silvia, Hennawi, Joseph F., Schindler, Jan-Torge, Yang, Jinyi, Wang, Feige, Barth, Aaron J., Bañados, Eduardo, Eilers, Anna-Christina, Bosman, Sarah E. I., Davies, Frederick B., Venemans, Bram P., Mazzucchelli, Chiara, Belladitta, Silvia, Vito, Fabio, Farina, Emanuele Paolo, Andika, Irham T., Fan, Xiaohui, Walter, Fabian, Decarli, Roberto, Onoue, Masafusa, Nanni, Riccardo
We present optical and near-infrared (NIR) spectroscopic observations for a sample of $45$ quasars at $6.50 < z \leq 7.64$ with absolute magnitudes at $1450$ {\AA} in the range $-28.82 \leq M_{1450} \leq -24.13$ and their composite spectrum. The medi
Externí odkaz:
http://arxiv.org/abs/2406.07612
Autor:
Ighina, Luca, Caccianiga, Alessandro, Moretti, Alberto, Broderick, Jess W., Leung, James K., Paterson, Sean, Rigamonti, Fabio, Seymour, Nick, Belladitta, Silvia, Drouart, Guillaume, Galvin, Tim J., Hurley-Walker, Natasha
Publikováno v:
A&A 687, A242 (2024)
We present a multi-wavelength analysis, from the radio to the X-ray band, of the redshift $z=6.44$ VIK J2318$-$31 radio-loud (RL) quasi stellar object (QSO), one of the most distant currently known in this class. The work is based on newly obtained (
Externí odkaz:
http://arxiv.org/abs/2405.03741
Autor:
Byrne, Xander, Meyer, Romain A., Farina, Emanuele Paolo, Bañados, Eduardo, Walter, Fabian, Decarli, Roberto, Belladitta, Silvia, Loiacono, Federica
Of the hundreds of $z\gtrsim6$ quasars discovered to date, only one is known to be gravitationally lensed, despite the high lensing optical depth expected at $z\gtrsim6$. High-redshift quasars are typically identified in large-scale surveys by applyi
Externí odkaz:
http://arxiv.org/abs/2403.17903
Autor:
Xie, Zhang-Liang, Banados, Eduardo, Belladitta, Silvia, Mazzucchelli, Chiara, Schindler, Jan-Torge, Davies, Frederick B., Venemans, Bram P.
Blazars are radio-loud Active Galactic Nuclei (AGN) whose jets have a very small angle to our line of sight. Observationally, the radio emission are mostly compact or a compact-core with a 1-sided jet. With 2.5$^{\prime\prime}$ resolution at 3 GHz, t
Externí odkaz:
http://arxiv.org/abs/2401.04009
Autor:
Ighina, Luca, Leung, James K., Broderick, Jess W., Drouart, Guillaume, Seymour, Nick, Belladitta, Silvia, Caccianiga, Alessandro, Lenc, Emil, Moretti, Alberto, An, Tao, Galvin, Tim J., Heald, George H., Huynh, Minh T., McConnell, David, Murphy, Tara, Pritchard, Joshua, Quici, Benjamin, Shabala, Stas S., Tingay, Steven J., Turner, Ross J., Wang, Yuanming, White, Sarah V.
Publikováno v:
A&A 663, A73 (2022)
The recent detection of the quasi-stellar object (QSO) VIKING J231818.3$-$311346 (hereafter VIK J2318$-$3113) at redshift $z=6.44$ in the Rapid ASKAP Continuum Survey (RACS) uncovered its radio-loud nature, making it one of the most distant known to
Externí odkaz:
http://arxiv.org/abs/2203.08142
Autor:
Diana, Alessandro, Caccianiga, Alessandro, Moretti, Alberto, Ighina, Luca, Belladitta, Silvia, Della Ceca, Roberto
We present the space density evolution, from z=1.5 up to z=5.5, of the most massive (M$\geq10^9$M$_{\odot}$) black holes hosted in jetted Active Galactic Nuclei(AGNs). The analysis is based on a sample of 380 luminosity-selected ($\lambda$L$_{1350}\g
Externí odkaz:
http://arxiv.org/abs/2202.03444
Autor:
Belladitta, Silvia, Caccianiga, Alessandro, Diana, Alessandro, Moretti, Alberto, Severgnini, Paola, Pedani, Marco, Cassarà, Letizia P., Spingola, Cristiana, Ighina, Luca, Rossi, Andrea, Della Ceca, Roberto
Publikováno v:
A&A 660, A74 (2022)
We report on a LUCI/Large Binocular Telescope near-infrared (NIR) spectrum of PSO J030947.49+271757.31 (hereafter PSO J0309+27), the highest redshift blazar known to date (z$\sim$6.1). From the C$\rm IV$$\lambda$1549 broad emission line we found that
Externí odkaz:
http://arxiv.org/abs/2201.08863
Autor:
Moretti, Alberto, Ghisellini, Gabriele, Caccianiga, Alessandro, Belladitta, Silvia, Della Ceca, Roberto, Ighina, Luca, Sbarrato, Tullia, Severgnini, Paola, Spingola, Cristiana, INAF-OAB, Insubria, U., INAF-IRA
We report on two Chandra observations of the quasar PSO J0309+27, the most distant blazar observed so far (z=6.1), performed eight months apart, in March and November 2020. Previous Swift-XRT observation showed that this object is one of the brightes
Externí odkaz:
http://arxiv.org/abs/2107.09752
Autor:
Caccianiga, Alessandro, Moretti, Alberto, Belladitta, Silvia, Della Ceca, Roberto, Antón, Sonia, Ballo, Lucia, Cicone, Claudia, Dallacasa, Daniele, Gargiulo, Adriana, Ighina, Luca, Marchã, Maria J., Severgnini, Paola
High redshift blazars are an important class of Active Galactic Nuclei (AGN) that can provide an independent estimate of the supermassive black-hole mass function in high redshift radio-loud AGN without the bias due to absorption along the line-of-si
Externí odkaz:
http://arxiv.org/abs/1901.02910