Výsledky vyhledávání

Quasars as high-redshift standard candles

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

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The Smallest Scale of Hierarchy Survey (SSH). II. Extended star formation and bar-like features in the dwarf galaxy NGC 3741: recent merger or ongoing gas accretion?

Autor: F Annibali, C Bacchini, G Iorio, M Bellazzini, R Pascale, G Beccari, M Cignoni, L Ciotti, C Nipoti, E Sacchi, M Tosi, F Cusano, S Bisogni, A Gargiulo, D Paris

Using Large Binocular Telescope deep imaging data from the Smallest Scale of Hierarchy Survey (SSH) and archival Hubble Space Telescope data, we reveal the presence of two elongated stellar features contiguous to a bar-like stellar structure in the i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1cab4f15c5c89e6a7f94a40aab61d89
http://hdl.handle.net/20.500.12386/32348

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The WISSH quasars project XI. The mean Spectral Energy Distribution and Bolometric Corrections of the most luminous quasars

Hyper-luminous Quasi-Stellar Objects (QSOs) represent the ideal laboratory to investigate Active Galactic Nuclei (AGN) feedback mechanism since their formidable energy release causes powerful winds at all scales and thus the maximum feedback is expec

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c6f541ecccb934fb60cf3368d1da5ead

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The WISSH quasars project X. Discovery of a multi-component and highly-variable UV ultra-fast outflow in a z=3.6 quasar

Autor: G. Vietri, T. Misawa, E. Piconcelli, P. Franzetti, A. Luminari, A. Travascio, M. Bischetti, S. Bisogni, A. Bongiorno, G. Bruni, C. Feruglio, A. Giunta, F. Nicastro, I. Saccheo, V. Testa, F. Tombesi, C. Vignali, L. Zappacosta, F. Fiore

We report on the variability of a multi-component broad absorption line (BAL) system observed in the hyper-luminous quasar J1538+0855 at z=3.6. Observations from SDSS, VLT, LBT and Subaru telescopes taken at five different epochs, spanning 17 yr in t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c902de0907f98b6b38a53aeec6061f99

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An X-ray fading, UV brightening QSO at z 6

Autor: F. Vito, M. Mignoli, R. Gilli, W. N. Brandt, O. Shemmer, F. E. Bauer, S. Bisogni, B. Luo, S. Marchesi, R. Nanni, G. Zamorani, A. Comastri, F. Cusano, S. Gallerani, C. Vignali, G. Lanzuisi

Publikováno v: Astronomy & Astrophysics, 663:A159

Explaining the existence of super massive black holes (SMBHs) with MBH ≳ 108 M⊙ at z ≳ 6 is a persistent challenge to modern astrophysics. Multiwavelength observations of z ≳ 6 quasi-stellar objects (QSOs) reveal that, on average, their accre

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::29031cafeb6b5c1914b9f63eb795a35a
http://hdl.handle.net/1887/3561897

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SIPGI: an interactive pipeline for spectroscopic data reduction

Autor: A Gargiulo, M Fumana, S Bisogni, P Franzetti, L P Cassarà, B Garilli, M Scodeggio, G Vietri

We present SIPGI, a spectroscopic pipeline to reduce optical/near-infrared data from slit-based spectrographs. SIPGI is a complete spectroscopic data reduction environment which retains the high level of flexibility and accuracy typical of the standa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::708c5215dbe319b9d31f87e5977da479

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A powerful (and likely young) radio-loud quasar at z = 5.3

Autor: S. Belladitta, A. Moretti, A. Caccianiga, D. Dallacasa, C. Spingola, M. Pedani, L. P. Cassarà, S. Bisogni

Publikováno v: Astronomy & Astrophysics. 669:A134

We present the discovery of PSO J191.05696$+$86.43172 (hereafter PSO J191$+$86), a new powerful radio-loud quasar (QSO) in the early Universe (z = 5.32). We discovered it by cross-matching the NRAO VLA Sky Survey (NVSS) radio catalog at 1.4 GHz with

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66f08f4c16b37267076ca0a2c4357852
https://doi.org/10.1051/0004-6361/202243855

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The Type II AGN-host galaxy connection

Autor: P. Franzetti, A. Zanichelli, Agnieszka Pollo, C. Mancini, M. Scodeggio, Maria del Carmen Polletta, G. Vietri, Alexander Fritz, Letizia P. Cassarà, Małgorzata Siudek, Giorgio Manzoni, Daniela Vergani, D. Maccagni, M. Fumana, G. Zamorani, Bianca Garilli, Katarzyna Małek, A. Gargiulo, S. Bisogni

Publikováno v: Astronomy & astrophysics, 2022, Vol.659, pp.A129 [Peer Reviewed Journal]
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2022, 659, ⟨10.1051/0004-6361/202141072⟩

We present a study of optically-selected Type II AGN at 0.5 < z < 0.9 from the VIPERS and VVDS surveys, to investigate the connection between AGN activity and physical properties of their host galaxies. The host stellar mass is estimated through spec

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c7db56827ec154708ad6cfb332b3421
https://doi.org/10.1051/0004-6361/202141072

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