Zobrazeno 1 - 10
of 208
pro vyhledávání: '"J, Assef"'
Autor:
Peter G. Boorman, Daniel Stern, Roberto J. Assef, Abhijeet Borkar, Murray Brightman, Johannes Buchner, Chien-Ting Chen, Hannah P. Earnshaw, Fiona A. Harrison, Gabriele A. Matzeu, Ryan W. Pfeifle, Claudio Ricci, Jiří Svoboda, Núria Torres-Albà, Ingyin Zaw
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 230 (2024)
Recent models suggest approximately half of all accreting supermassive black holes (SMBHs; M _BH ≳ 10 ^5 M _⊙ ) are expected to undergo intense growth phases behind Compton-thick ( N _H > 1.5 × 10 ^24 cm ^−2 ) veils of obscuring gas. However,
Externí odkaz:
https://doaj.org/article/26b6e42f78434cc0886de80fee9ae245
Autor:
Logan B. Fries, Jonathan R. Trump, Keith Horne, Megan C. Davis, Catherine J. Grier, Yue Shen, Scott F. Anderson, Tom Dwelly, Y. Homayouni, Sean Morrison, Jessie C. Runnoe, Benny Trakhtenbrot, Roberto J. Assef, Dmitry Bizyaev, W. N. Brandt, Peter Breiding, Joel Brownstein, Priyanka Chakraborty, P. B. Hall, Anton M. Koekemoer, Héctor J. Ibarra-Medel, Mary Loli Martínez-Aldama, C. Alenka Negrete, Kaike Pan, Claudio Ricci, Donald P. Schneider, Hugh W. Sharp, Theodore B. Smith, Zachary Stone, Matthew J. Temple
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 239 (2024)
We present a velocity-resolved reverberation mapping analysis of the hypervariable quasar RM160 (SDSS J141041.25+531849.0) at z = 0.359 with 153 spectroscopic epochs of data representing a 10 yr baseline (2013–2023). We split the baseline into two
Externí odkaz:
https://doaj.org/article/96d2038e0f2c47619728e400204cf4e8
Autor:
Ming-Yang Zhuang, Qian Yang, Yue Shen, Monika Adamów, Douglas N. Friedel, R. A. Gruendl, Zachary Stone, Junyao Li, Xin Liu, Paul Martini, Timothy M. C. Abbott, Scott F. Anderson, Roberto J. Assef, Franz E. Bauer, Richard Bielby, W. N. Brandt, Colin J. Burke, Jorge Casares, Yu-Ching Chen, Gisella De Rosa, Alex Drlica-Wagner, Tom Dwelly, Alice Eltvedt, Gloria Fonseca Alvarez, Jianyang Fu, Cesar Fuentes, Melissa L. Graham, Catherine J. Grier, Nathan Golovich, Patrick B. Hall, Patrick Hartigan, Keith Horne, Anton M. Koekemoer, Mirko Krumpe, Jennifer I. Li, Chris Lidman, Umang Malik, Amelia Mangian, Andrea Merloni, Claudio Ricci, Mara Salvato, Rob Sharp, David E. Trilling, Brad E. Tucker, Di Wen, Zachary Wideman, Yongquan Xue, Zhefu Yu, Catherine Zucker
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 274, Iss 2, p 42 (2024)
High-quality Extragalactic Legacy-field Monitoring (HELM) is a long-term observing program that photometrically monitors several well-studied extragalactic legacy fields with the Dark Energy Camera (DECam) imager on the CTIO 4 m Blanco telescope. Sin
Externí odkaz:
https://doaj.org/article/c5e1a29f28094a219621b9aff794a659
Autor:
Guodong Li, Roberto J. Assef, Chao-Wei Tsai, Jingwen Wu, Peter R. M. Eisenhardt, Daniel Stern, Tanio Díaz-Santos, Andrew W. Blain, Hyunsung D. Jun, Román Fernández Aranda, Dejene Zewdie
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 40 (2024)
Hot dust-obscured galaxies (Hot DOGs) are a rare population of hyperluminous infrared galaxies discovered by the Wide-field Infrared Survey Explorer mission. Despite the significant obscuration of the active galactic nucleus (AGN) by dust in these sy
Externí odkaz:
https://doaj.org/article/bb11b8fef5ae4fbe895593e5d79fc4a4
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