Now showing items 1-20 of 27

    • Accretion disc time lag distributions : applying CREAM to simulated AGN light curves 

      Starkey, David; Horne, Keith; Villforth, C. (2016-02-21) - Journal article
      Active galactic nuclei (AGN) vary in their brightness across all wavelengths. Moreover, longer wavelength ultraviolet-optical continuum light curves appear to be delayed with respect to shorter wavelength light curves. A ...
    • Accretion disk reverberation with Hubble Space Telescope observations of NGC 4593 : evidence for diffuse continuum lags 

      Cackett, Edward M.; Chiang, Chia-Ying; McHardy, Ian; Edelson, Rick; Goad, Michael R.; Horne, Keith; Korista, Kirk T. (2018-04-12) - Journal article
      The Seyfert 1 galaxy NGC 4593 was monitored spectroscopically with the Hubble Space Telescope as part of a reverberation mapping campaign that also included Swift, Kepler and ground-based photometric monitoring. During ...
    • Continuum reverberation mapping of AGN accretion disks 

      M. Fausnaugh, Michael; M. Peterson, Bradley; Starkey, David; Horne, Keith; and the AGN STORM Collaboration (Frontiers Media S.A., 2017-12-05) - Conference item
      We show recent detections of inter-band continuum lags in three AGN (NGC 5548, NGC 2617, and MCG+08-11-011), which provide new constraints on the temperature profiles and absolute sizes of the accretion disks. We find lags ...
    • Continuum reverberation mapping of the accretion disks in two Seyfert 1 galaxies 

      Fausnaugh, M. M.; Starkey, D. A.; Horne, Keith; Kochanek, C. S.; Peterson, B. M.; Bentz, M. C.; Denney, K. D.; Grier, C. J.; Grupe, D.; Pogge, R. W.; De Rosa, G.; Adams, S. M.; Barth, A. J.; Beatty, Thomas G.; Bhattacharjee, A.; Borman, G. A.; Boroson, T. A.; Bottorff, M. C.; Brown, Jacob E.; Brown, Jonathan S.; Brotherton, M. S.; Coker, C. T.; Crawford, S. M.; Croxall, K. V.; Eftekharzadeh, Sarah; Eracleous, Michael; Joner, M. D.; Henderson, C. B.; Holoien, T. W. -S.; Hutchison, T.; Kaspi, Shai; Kim, S.; King, Anthea L.; Li, Miao; Lochhaas, Cassandra; Ma, Zhiyuan; MacInnis, F.; Manne-Nicholas, E. R.; Mason, M.; Montuori, Carmen; Mosquera, Ana; Mudd, Dale; Musso, R.; Nazarov, S. V.; Nguyen, M. L.; Okhmat, D. N.; Onken, ChristopherA; Ou-Yang, B.; Pancoast, A.; Pei, L.; Penny, Matthew T.; Poleski, Radosław; Rafter, Stephen; Romero-Colmenero, E.; Runnoe, Jessie; Sand, David J.; Schimoia, Jaderson S.; Sergeev, S. G.; Shappee, B. J.; Simonian, Gregory V.; Somers, Garrett; Spencer, M.; Stevens, Daniel J.; Tayar, Jamie; Treu, T.; Valenti, Stefano; Van Saders, J.; Villanueva Jr, S.; Villforth, C.; Weiss, Yaniv; Winkler, H.; Zhu, W. (2018-02-20) - Journal article
      We present optical continuum lags for two Seyfert 1 galaxies, MCG+08-11-011 and NGC 2617, using monitoring data from a reverberation mapping campaign carried out in 2014. Our light curves span the ugriz filters over four ...
    • Correlated X-ray/ultraviolet/optical variability in NGC 6814 

      Troyer, Jon; Starkey, David; Cackett, Edward M.; Bentz, Misty C.; Goad, Michael R.; Horne, Keith; Seals, James E. (2016-03-11) - Journal article
      We present results of a three-month combined X-ray/UV/optical monitoring campaign of the Seyfert 1 galaxy NGC 6814. The object was monitored by Swift from June through August 2012 in the X-ray and UV bands and by the ...
    • Extended baseline photometry of rapidly changing weather patterns on the brown dwarf binary Luhman-16 

      Street, R. A.; Fulton, B. J.; Scholz, A.; Horne, Keith; Helling, C.; Juncher, D.; Lee, G.; Valenti, S. (2015-10-20) - Journal article
      Luhman-16 (WISE J1049-5319) was recently discovered to be a nearby (∼2 pc) brown dwarf binary that exhibits a high degree of photometric variability (Δm ∼ 0.1 mag). This is thought to be due to the evolution of "cloud" ...
    • A large ground-based observing campaign of the disintegrating planet K2-22b 

      Colón, Knicole D.; Zhou, George; Shporer, Avi; Collins, Karen A.; Bieryla, Allyson; Espinoza, Néstor; Murgas, Felipe; Pattarakijwanich, Petchara; Awiphan, Supachai; Armstrong, James D.; Bailey, Jeremy; Barentsen, Geert; Bayliss, Daniel; Chakpor, Anurak; Cochran, William D.; Dhillon, Vikram S.; Horne, Keith; Ireland, Michael; Kedziora-Chudczer, Lucyna; Kielkopf, John F.; Komonjinda, Siramas; Latham, David W.; Marsh, Tom R.; Mkrtichian, David E.; Pallé, Enric; Ruffolo, David; Sefako, Ramotholo; Tinney, Chris G.; Wannawichian, Suwicha; Yuma, Suraphong (2018-11-01) - Journal article
      We present 45 ground-based photometric observations of the K2-22 system collected between 2016 December and 2017 May, which we use to investigate the evolution of the transit of the disintegrating planet K2-22b. Last ...
    • Non-blackbody disks can help explain inferred AGN accretion disk sizes 

      Hall, Patrick; Sarrouh, Ghassan; Horne, Keith (2018-02-20) - Journal article
      If the atmospheric density ρatm in the accretion disk of an active galactic nucleus (AGN) is sufficiently low, scattering in the atmosphere can produce a non-blackbody emergent spectrum. For a given bolometric luminosity, ...
    • Reverberation mapping of optical emission lines in five active galaxies 

      Fausnaugh, M. M.; Grier, C. J.; Bentz, M. C.; Denney, K. D.; Rosa, G. De; Peterson, B. M.; Kochanek, C. S.; Pogge, R. W.; Adams, S. M.; Barth, A. J.; Beatty, Thomas G.; Bhattacharjee, A.; Borman, G. A.; Boroson, T. A.; Bottorff, M. C.; Brown, Jacob E.; Brown, Jonathan S.; Brotherton, M. S.; Coker, C. T.; Crawford, S. M.; Croxall, K. V.; Eftekharzadeh, Sarah; Eracleous, Michael; Joner, M. D.; Henderson, C. B.; Holoien, T. W. -S.; Horne, Keith; Hutchison, T.; Kaspi, Shai; Kim, S.; King, Anthea L.; Li, Miao; Lochhaas, Cassandra; Ma, Zhiyuan; MacInnis, F.; Manne-Nicholas, E. R.; Mason, M.; Montuori, Carmen; Mosquera, Ana; Mudd, Dale; Musso, R.; Nazarov, S. V.; Nguyen, M. L.; Okhmat, D. N.; Onken, Christopher A.; Ou-Yang, B.; Pancoast, A.; Pei, L.; Penny, Matthew T.; Poleski, Radoslaw; Rafter, Stephen; Romero-Colmenero, E.; Runnoe, Jessie; Sand, David J.; Schimoia, Jaderson S.; Sergeev, S. G.; Shappee, B. J.; Simonian, Gregory V.; Somers, Garrett; Spencer, M.; Starkey, D.; Stevens, Daniel J.; Tayar, Jamie; Treu, T.; Valenti, Stefano; Saders, J. Van; Villanueva, Jr, S.; Villforth, C.; Weiss, Yaniv; Winkler, H.; Zhu, W. (2017-05-12) - Journal article
      We present the first results from an optical reverberation mapping campaign executed in 2014 targeting the active galactic nuclei (AGNs) MCG+08-11-011, NGC 2617, NGC 4051, 3C 382, and Mrk 374. Our targets have diverse and ...
    • A reverberation-based black hole mass for MCG-06-30-15 

      Bentz, Misty C.; Cackett, Edward M.; Crenshaw, D. Michael; Horne, Keith; Street, Rachel; Ou-Yang, Benjamin (2016-10-20) - Journal article
      We present the results of a reverberation campaign targeting MGC-06-30-15. Spectrophotometric monitoring and broad-band photometric monitoring over the course of 4 months in the spring of 2012 allowed a determination of a ...
    • A search for extra-solar planetary transits in the field of open cluster NGC 6819 

      Street, Rachel (University of St Andrews, 2002) - Thesis
      The technique of searching for extra-solar planetary transits is investigated. This technique, which relies on detecting the brief, shallow eclipses caused by planets passing across the line of sight to the primary star, ...
    • The Sloan Digital Sky Survey Reverberation Mapping Project : an investigation of biases in C iv emission line properties 

      Denney, K. D.; Horne, Keith; Shen, Yue; Brandt, W. N.; Ho, Luis C.; Peterson, B. M.; Richards, Gordon T.; Trump, J. R.; Ge, J. (2016-05-26) - Journal article
      We investigate the dependence on data quality of quasar properties measured from the C iv emission line region at high redshifts. Our measurements come from 32 epochs of Sloan Digital Sky Survey Reverberation Mapping Project ...
    • The Sloan Digital Sky Survey Reverberation Mapping Project : biases in z > 1.46 redshifts due to quasar diversity 

      Denney, K. D.; Horne, Keith; Brandt, W. N.; Grier, C. J.; Ho, Luis C.; Peterson, B. M.; Trump, J. R.; Ge, J. (2016-12-06) - Journal article
      We use the coadded spectra of 32 epochs of Sloan Digital Sky Survey (SDSS) Reverberation Mapping Project observations of 482 quasars with z > 1.46 to highlight systematic biases in the SDSS- and Baryon Oscillation Spectroscopic ...
    • The Sloan Digital Sky Survey Reverberation Mapping project : composite lags at z ≤ 1 

      Li, Jennifer; Shen, Yue; Horne, Keith; Brandt, W. N.; Greene, Jenny E.; Grier, C. J.; Ho, Luis C.; Kochanek, Chris; Schneider, Donald P.; Trump, Jonathan R.; Dawson, Kyle S.; Pan, Kaike; Bizyaev, Dmitry; Oravetz, Daniel; Simmons, Audrey; Malanushenko, Elena (2017-09-01) - Journal article
      We present composite broad-line region (BLR) reverberation mapping lag measurements for Hα, Hβ, He II λ4686, and Mg II for a sample of 144, z ≲ 1 quasars from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) ...
    • The Sloan Digital Sky Survey reverberation mapping project : first broad-line Hβ and Mg II lags at z ≳ 0.3 from six-month spectroscopy 

      Shen, Yue; Horne, Keith; Grier, C. J.; Peterson, Bradley M.; Denney, Kelly D.; Trump, Jonathan R.; Sun, Mouyuan; Brandt, W. N.; Kochanek, Christopher S.; Dawson, Kyle S.; Green, Paul J.; Greene, Jenny E.; Hall, Patrick B.; Ho, Luis C.; Jiang, Linhua; Kinemuchi, Karen; McGreer, Ian D.; Petitjean, Patrick; Richards, Gordon T.; Schneider, Donald P.; Strauss, Michael A.; Tao, Charling; Wood-Vasey, W. M.; Zu, Ying; Pan, Kaike; Bizyaev, Dmitry; Ge, Jian; Oravetz, Daniel; Simmons, Audrey (2016-02-10) - Journal article
      Reverberation mapping (RM) measurements of broad-line region (BLR) lags in z > 0.3 quasars are important for directly measuring black hole masses in these distant objects, but so far there have been limited attempts and ...
    • The Sloan Digital Sky Survey Reverberation Mapping Project : Hα and Hβ reverberation measurements from first-year spectroscopy and photometry 

      Grier, C. J.; Trump, J. R.; Shen, Yue; Horne, Keith; Kinemuchi, Karen; McGreer, Ian D.; Starkey, D. A.; Brandt, W. N.; Hall, P. B.; Kochanek, C. S.; Chen, Yuguang; Denney, K. D.; Greene, Jenny E.; Ho, L. C.; Homayouni, Y.; Li, Jennifer I-Hsiu; Pei, Liuyi; Peterson, B. M.; Petitjean, P.; Schneider, D. P.; Sun, Mouyuan; AlSayyad, Yusura; Bizyaev, Dmitry; Brinkmann, Jonathan; Brownstein, Joel R.; Bundy, Kevin; Dawson, K S.; Eftekharzadeh, Sarah; Fernandez-Trincado, J. G.; Gao, Yang; Hutchinson, Timothy A.; Jia, Siyao; Jiang, Linhua; Oravetz, Daniel; Pan, Kaike; Paris, Isabelle; Ponder, Kara A.; Peters, Christina; Rogerson, Jesse; Simmons, Audrey; Smith, Robyn; Wang, Ran (2017-12-07) - Journal article
      We present reverberation mapping results from the first year of combined spectroscopic and photometric observations of the Sloan Digital Sky Survey Reverberation Mapping Project. We successfully recover reverberation time ...
    • The Sloan Digital Sky Survey Reverberation Mapping Project : quasar host galaxies at z <0.8 from image decomposition 

      Yue, Minghao; Jiang, Linhua; Shen, Yue; Hall, Patrick B.; Yu, Zhefu; Schneider, Donald P.; Ho, Luis C.; Horne, Keith; Petitjean, Patrick; Trump, Jonathan R. (2018-08-07) - Journal article
      We present the rest-frame UV and optical photometry and morphology of low-redshift broad-line quasar host galaxies from the Sloan Digital Sky Survey Reverberation Mapping project. Our sample consists of 103 quasars at z < ...
    • The Sloan Digital Sky Survey Reverberation Mapping Project : sample characterization 

      Shen, Yue; Hall, Patrick B.; Horne, Keith; Zhu, Guangtun; McGreer, Ian; Simm, Torben; Trump, Jonathan R.; Kinemuchi, Karen; Brandt, W. N.; Green, Paul J.; Grier, C. J.; Guo, Hengxiao; Ho, Luis C.; Homayouni, Yasaman; Jiang, Linhua; Li, Jennifer I-Hsiu; Morganson, Eric; Petitjean, Patrick; Richards, Gordon T.; Schneider, Donald P.; Starkey, D. A.; Wang, Shu; Chambers, Ken; Kaiser, Nick; Kudritzki, Rolf-Peter; Magnier, Eugene; Waters, Christopher (2019-04-15) - Journal article
      We present a detailed characterization of the 849 broad-line quasars from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. Our quasar sample covers a redshift range of 0.1 < z < 4.5 and is flux-limited ...
    • The Sloan Digital Sky Survey Reverberation Mapping Project : systematic investigations of short-timescale CIV broad absorption line variability 

      Hemler, Z. S.; Grier, C. J.; Brandt, W. N.; Hall, P. B.; Horne, Keith; Shen, Yue; Trump, J. R.; Schneider, D. P.; Vivek, M.; Bizyaev, Dmitry; Oravetz, Audrey; Oravetz, Daniel; Pan, Kaike (2019-02-06) - Journal article
      We systematically investigate short-timescale (<10-day rest-frame) Civ broad absorption-line (BAL) variability to constrain quasar-wind properties and provide insights into BAL-variability mechanisms in quasars. We employ ...
    • Space Telescope and Optical Reverberation Mapping Project. III. Optical continuum emission and broadband time delays in NGC 5548 

      Fausnaugh, M. M.; Denney, K. D.; Barth, A. J.; Bentz, M. C.; Bottorff, M. C.; Carini, M. T.; Croxall, K. V.; Rosa, G. De; Goad, M. R.; Horne, Keith; Joner, M. D.; Kaspi, S.; Kim, M.; Klimanov, S. A.; Kochanek, C. S.; Leonard, D. C.; Netzer, H.; Peterson, B. M.; Schnülle, K.; Sergeev, S. G.; Vestergaard, M.; Zheng, W. K.; Zu, Y.; Anderson, M. D.; Arévalo, P.; Bazhaw, C.; Borman, G. A.; Boroson, T. A.; Brandt, W. N.; Breeveld, A. A.; Brewer, B. J.; Cackett, E. M.; Crenshaw, D. M.; Bontà, E. Dalla; De Lorenzo-Cáceres, A.; Dietrich, M.; Edelson, R.; Efimova, N. V.; Ely, J.; Evans, P. A.; Filippenko, A. V.; Flatland, K.; Gehrels, N.; Geier, S.; Gelbord, J. M.; Gonzalez, L.; Gorjian, V.; Grier, C. J.; Grupe, D.; Hall, P. B.; Hicks, S.; Horenstein, D.; Hutchison, T.; Im, M.; Jensen, J. J.; Jones, J.; Kaastra, J.; Kelly, B. C.; Kennea, J. A.; Kim, S. C.; Korista, K. T.; Kriss, G. A.; Lee, J. C.; Lira, P.; Macinnis, F.; Manne-Nicholas, E. R.; Mathur, S.; McHardy, I. M.; Montouri, C.; Musso, R.; Nazarov, S. V.; Norris, R. P.; Nousek, J. A.; Okhmat, D. N.; Pancoast, A.; Papadakis, I.; Parks, J. R.; Pei, L.; Pogge, R. W.; Pott, J. -U.; Rafter, S. E.; Rix, H. -W.; Saylor, D. A.; Schimoia, J. S.; Siegel, M.; Spencer, M.; Starkey, D.; Sung, H. I.; Teems, K. G.; Treu, T.; Turner, C. S.; Uttley, P.; Villforth, C.; Weiss, Y.; Woo, J. H.; Yan, H.; Young, S. (2016-04-10) - Journal article
      We present ground-based optical photometric monitoring data for NGC 5548, part of an extended multiwavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine ...