Zobrazeno 1 - 10
of 145
pro vyhledávání: '"Emanuele Giallongo"'
Autor:
Andrea Grazian, Emanuele Giallongo, Konstantina Boutsia, Stefano Cristiani, Fabio Fontanot, Manuela Bischetti, Laura Bisigello, Angela Bongiorno, Giorgio Calderone, Francesco Chiti Tegli, Guido Cupani, Gabriella De Lucia, Valentina D’Odorico, Chiara Feruglio, Fabrizio Fiore, Giovanni Gandolfi, Giorgia Girardi, Francesco Guarneri, Michaela Hirschmann, Matteo Porru, Giulia Rodighiero, Ivano Saccheo, Matteo Simioni, Andrea Trost, Akke Viitanen
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 1, p 84 (2024)
In the past, high- z active galactic nuclei (AGNs) were given a minor role as possible drivers of reionization, despite initial evidence in favor of their large space densities at low luminosities by Chandra and the Hubble Space Telescope. Recent obs
Externí odkaz:
https://doaj.org/article/bb545d929e7c424caee51d02d291bd04
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 75 (2024)
Deep surveys with the James Webb Space Telescope (JWST) have revealed an emergent population of moderate-luminosity, broad-line active galactic nuclei (AGNs) at 4 ≲ z ≲ 13 powered by accretion onto early massive black holes. The high number densi
Externí odkaz:
https://doaj.org/article/ef1a5d6241964fe98ffc2867cde31d90
Autor:
Andrea Grazian, Konstantina Boutsia, Emanuele Giallongo, Stefano Cristiani, Fabio Fontanot, Manuela Bischetti, Angela Bongiorno, Giorgio Calderone, Guido Cupani, Valentina D’Odorico, Chiara Feruglio, Fabrizio Fiore, Francesco Guarneri, Matteo Porru, Ivano Saccheo
Publikováno v:
The Astrophysical Journal, Vol 955, Iss 1, p 60 (2023)
One of the key open questions in cosmology is the nature of sources that completed cosmological hydrogen reionization at z ∼ 5.2. High- z primeval galaxies have been long considered the main drivers of reionization, with a minor role played by high
Externí odkaz:
https://doaj.org/article/1966d7d601894f16b20a892286ba55ea
Autor:
Teresa A. Ashcraft, Tyler McCabe, Caleb Redshaw, Rogier A. Windhorst, Rolf A. Jansen, Seth H. Cohen, Timothy Carleton, Kris Ganzel, Anton M. Koekemoer, Russell E. Ryan, Mario Nonino, Diego Paris, Andrea Grazian, Adriano Fontana, Emanuele Giallongo, Roberto Speziali, Vincenzo Testa, Konstantina Boutsia, Robert W. O’Connell, Michael J. Rutkowski, Claudia Scarlata, Harry I. Teplitz, Xin Wang, Marc Rafelski, Norman A. Grogin
Publikováno v:
Publications of the Astronomical Society of the Pacific. 135:024101
We obtained 838 Sloan r-band images (~28 hrs) of the GOODS-North field with the Large Binocular Camera (LBC) on the Large Binocular Telescope in order to study the presence of extended, low surface brightness features in galaxies and investigate the
Autor:
Guido Cupani, Giorgio Calderone, Pierluigi Selvelli, Stefano Cristiani, Konstantina Boutsia, Andrea Grazian, Fabio Fontanot, Francesco Guarneri, Valentina D’Odorico, Emanuele Giallongo, Nicola Menci
We report on the spectral confirmation of 18 QSO candidates from the "QUasars as BRIght beacons for Cosmology in the Southern hemisphere'' survey (QUBRICS), previously observed in the optical band, for which we acquired new spectroscopic data in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c96778e5544b89f485ee29d4cccc1b4
http://arxiv.org/abs/2112.02594
http://arxiv.org/abs/2112.02594
Autor:
Nicola Menci, Fabio Fontanot, Emanuele Giallongo, Giorgio Calderone, Valentina D'Odorico, F. Guarneri, Stefano Cristiani, G. Cupani, A. Omizzolo, Konstantina Boutsia, Andrea Grazian
Based on results by recent surveys, the number of bright quasars at redshifts z>3 is being constantly revised upwards. Current consensus is that at bright magnitudes ($M_{1450}\le -27$) the number densities of such sources could have been underestima
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4dd88a05fe7b1787bd237c0b7119ca0d
Autor:
Andrea Grazian, Emanuele Giallongo, Konstantina Boutsia, Giorgio Calderone, Stefano Cristiani, Guido Cupani, Fabio Fontanot, Francesco Guarneri, Yacob Ozdalkiran
Motivated by evidences favoring a rapid and late hydrogen reionization process completing at z~5.2-5.5 and mainly driven by rare and luminous sources, we have reassessed the estimate of the space density of ultra-luminous QSOs at z~5 in the framework
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b970437689751001bf384164bc1c5600
Autor:
Caleb Redshaw, Tyler McCabe, Lillian Otteson, Rogier A. Windhorst, Rolf A. Jansen, Seth H. Cohen, Timothy Carleton, Teresa A. Ashcraft, Mario Nonino, Diego Paris, Andrea Grazian, Adriano Fontana, Emanuele Giallongo, Roberto Speziali, Vincenzo Testa, Konstantina Boutsia, Anton Koekemoer, Robert W. O’Connell, Michael J. Rutkowski, Russell E. Ryan, Claudia Scarlata, Harry I. Teplitz, Xin Wang, Marc Rafelski, Norman A. Grogin
Publikováno v:
Research Notes of the AAS. 6:63
We present the results of deep ground-based U-band imaging of the Extended Groth Strip (EGS) field, and the creation of a best resolution mosaic and a best depth mosaic following the seeing-sorted stacking method of Ashcraft et al. The analysis uses
Autor:
A. Omizzolo, Konstantina Boutsia, Andrea Grazian, Nicola Menci, Ricardo Amorín, Emanuele Giallongo, Mara Salvato, Valentina D'Odorico, Stefano Cristiani, Michael Romano, G. Cupani, Fabio Fontanot, Giorgio Calderone, F. Guarneri
We present the results of the spectroscopic follow up of the QUBRICS survey. The selection method is based on a machine learning approach applied to photometric catalogs, covering an area of $\sim$ 12,400 deg$^2$ in the Southern Hemisphere. The spect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8da401e74d2870aa8c2507544f53eb14
http://hdl.handle.net/11577/3355846
http://hdl.handle.net/11577/3355846
Constraints on Dynamical Dark Energy Models from the Abundance of Massive Galaxies at High Redshifts
Autor:
Emanuele Giallongo, David Elbaz, Adriano Fontana, Paola Santini, Andrea Grazian, A. Lamastra, N. Menci, E. Merlin, Norma G. Sanchez, F. Fortuni, Marco Castellano, Tao Wang
Publikováno v:
Astrophys.J.
Astrophys.J., 2020, 900 (2), pp.108. ⟨10.3847/1538-4357/aba9d2⟩
The Astrophysical Journal
The Astrophysical Journal, 2020, 900 (2), pp.108. ⟨10.3847/1538-4357/aba9d2⟩
Astrophys.J., 2020, 900 (2), pp.108. ⟨10.3847/1538-4357/aba9d2⟩
The Astrophysical Journal
The Astrophysical Journal, 2020, 900 (2), pp.108. ⟨10.3847/1538-4357/aba9d2⟩
We compare the maximal abundance of massive systems predicted in different dynamical dark energy (DDE) models at high redshifts z = 4-7 with the measured abundance of the most massive galaxies observed to be already in place at such redshifts. The ai
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e51a32938de396998ad151a99e31e775