Zobrazeno 1 - 10
of 155
pro vyhledávání: '"Roberto J. Assef"'
Autor:
Grisha Zeltyn, Benny Trakhtenbrot, Michael Eracleous, Qian Yang, Paul Green, Scott F. Anderson, Stephanie LaMassa, Jessie Runnoe, Roberto J. Assef, Franz E. Bauer, W. N. Brandt, Megan C. Davis, Sara E. Frederick, Logan B. Fries, Matthew J. Graham, Norman A. Grogin, Muryel Guolo, Lorena Hernández-García, Anton M. Koekemoer, Mirko Krumpe, Xin Liu, Mary Loli Martínez-Aldama, Claudio Ricci, Donald P. Schneider, Yue Shen, Marzena Śniegowska, Matthew J. Temple, Jonathan R. Trump, Yongquan Xue, Joel R. Brownstein, Tom Dwelly, Sean Morrison, Dmitry Bizyaev, Kaike Pan, Juna A. Kollmeier
Publikováno v:
The Astrophysical Journal, Vol 966, Iss 1, p 85 (2024)
“Changing-look” active galactic nuclei (CL-AGNs) challenge our basic ideas about the physics of accretion flows and circumnuclear gas around supermassive black holes. Using first-year Sloan Digital Sky Survey V (SDSS-V) repeated spectroscopy of n
Externí odkaz:
https://doaj.org/article/339acb449dd0467789da0c0548528c8a
Autor:
Hugh W. Sharp, Y. Homayouni, Jonathan R. Trump, Scott F. Anderson, Roberto J. Assef, W. N. Brandt, Megan C. Davis, Logan B. Fries, Catherine J. Grier, Patrick B. Hall, Keith Horne, Anton M. Koekemoer, Mary Loli Martínez-Aldama, David M. Menezes, Theodore Pena, C. Ricci, Donald P. Schneider, Yue Shen, Benny Trakhtenbrot
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 1, p 93 (2024)
This work studies the relationship between accretion-disk size and quasar properties, using a sample of 95 quasars from the Sloan Digital Sky Survey Reverberation Mapping Project with measured lags between the g and i photometric bands. Our sample in
Externí odkaz:
https://doaj.org/article/5516619df054447ba18ede63d1d24af5
Autor:
Guodong Li, Chao-Wei Tsai, Daniel Stern, Jingwen Wu, Roberto J. Assef, Andrew W. Blain, Tanio Díaz-Santos, Peter R. M. Eisenhardt, Roger L. Griffith, Thomas H. Jarrett, Hyunsung D. Jun, Sean E. Lake, M. Lynne Saade
Publikováno v:
The Astrophysical Journal, Vol 958, Iss 2, p 162 (2023)
We report the discovery of the hyperluminous, highly obscured active galactic nuclei (AGN) WISE J190445.04+485308.9 (W1904+4853, hereafter, L _bol ∼ 1.1 × 10 ^13 L _⊙ ) at z = 0.415. Its well-sampled spectral energy distribution (SED) is dominat
Externí odkaz:
https://doaj.org/article/c34abb8095e54e1faac2a3a0a9df4f0b
Publikováno v:
The Astrophysical Journal, Vol 952, Iss 2, p 171 (2023)
Externí odkaz:
https://doaj.org/article/55618f79580f47e2a3d9234adc22f2d4
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 2, p 92 (2023)
Pairs of galaxies hosting active galactic nuclei (AGNs) are powerful probes of merger-driven supermassive black hole (SMBH) growth as they can resolve individual AGNs and trace mergers over a large range of physical separations. To exploit this on a
Externí odkaz:
https://doaj.org/article/c455fcfdf97a48b5a66683b6856756d0
Autor:
Christopher M. Carroll, Tonima T. Ananna, Ryan C. Hickox, Alberto Masini, Roberto J. Assef, Daniel Stern, Chien-Ting J. Chen, Lauranne Lanz
Publikováno v:
The Astrophysical Journal, Vol 950, Iss 2, p 127 (2023)
We present new estimates on the fraction of heavily X-ray-obscured, Compton-thick (CT) active galactic nuclei (AGNs) out to a redshift of z ≤ 0.8. From a sample of 540 AGNs selected by mid-infrared (MIR) properties in observed X-ray survey fields,
Externí odkaz:
https://doaj.org/article/821b9702b70e400e9320663a899b8b6d
Autor:
Logan B. Fries, Jonathan R. Trump, Megan C. Davis, C. J. Grier, Yue Shen, Scott F. Anderson, Tom Dwelly, Michael Eracleous, Y. Homayouni, Keith Horne, Mirko Krumpe, Sean Morrison, Jessie C. Runnoe, Benny Trakhtenbrot, Roberto J. Assef, W. N. Brandt, Joel Brownstein, Collin Dabbieri, Alexander Fix, Gloria Fonseca Alvarez, Sara Frederick, P. B. Hall, Anton M. Koekemoer, Jennifer I-Hsiu Li, Xin Liu, Mary Loli Martínez-Aldama, Claudio Ricci, Donald P. Schneider, Hugh W. Sharp, Matthew J. Temple, Qian Yang, Grisha Zeltyn, Dmitry Bizyaev
Publikováno v:
The Astrophysical Journal, Vol 948, Iss 1, p 5 (2023)
We present a high-cadence multiepoch analysis of dramatic variability of three broad emission lines (Mg ii , H β , and H α ) in the spectra of the luminous quasar ( λ L _λ (5100 Å) = 4.7 × 10 ^44 erg s ^−1 ) SDSS J141041.25+531849.0 at z = 0.
Externí odkaz:
https://doaj.org/article/276e882bf70d4f4cab2f2802e95336fb
Autor:
Julian E. Mejía-Restrepo, Benny Trakhtenbrot, Michael J. Koss, Kyuseok Oh, Jakob den Brok, Daniel Stern, Meredith C. Powell, Federica Ricci, Turgay Caglar, Claudio Ricci, Franz E. Bauer, Ezequiel Treister, Fiona A. Harrison, C. M. Urry, Tonima Tasnim Ananna, Daniel Asmus, Roberto J. Assef, Rudolf E. Bär, Patricia S. Bessiere, Leonard Burtscher, Kohei Ichikawa, Darshan Kakkad, Nikita Kamraj, Richard Mushotzky, George C. Privon, Alejandra F. Rojas, Eleonora Sani, Kevin Schawinski, Sylvain Veilleux
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 261, Iss 1, p 5 (2022)
We present measurements of broad emission lines and virial estimates of supermassive black hole masses ( M _BH ) for a large sample of ultrahard X-ray-selected active galactic nuclei (AGNs) as part of the second data release of the BAT AGN Spectrosco
Externí odkaz:
https://doaj.org/article/fee276ec42034bf29217b4c579110958
Autor:
Roberto J. Assef, E. E. Falco, J. Mejia-Restrepo, Evencio Mediavilla, Veronica Motta, R. Jerez, A. Melo, N. Godoy, F. Ávila-Vera
Context. The quadruple lensed system WGD2038-4008 (zs = 0.777 ± 0.001) has recently been discovered with the help of new techniques and observations. Black hole masses have been estimated for lensed quasars, but they have mostly been calculated for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1710f220b5d40d6e6ecaa11d15b5e02
http://arxiv.org/abs/2110.01575
http://arxiv.org/abs/2110.01575
Autor:
Andjelka B. Kovačević, Viktor Radović, Dragana Ilić, Luka Č. Popović, Roberto J. Assef, Paula Sánchez-Sáez, Robert Nikutta, Claudia M. Raiteri, Ilsang Yoon, Yasaman Homayouni, Yan-Rong Li, Neven Caplar, Bozena Czerny, Swayamtrupta Panda, Claudio Ricci, Isidora Jankov, Hermine Landt, Christian Wolf, Jelena Kovačević-Dojčinović, Maša Lakićević, Đorđe V. Savić, Oliver Vince, Saša Simić, Iva Čvorović-Hajdinjak, Sladjana Marčeta-Mandić
Publikováno v:
The Astrophysical Journal Supplement Series. 262:49
The Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will detect an unprecedentedly large sample of actively accreting supermassive black holes with typical accretion disk (AD) sizes of a few light days. This brings us to face challen