Outputs (6)

AGN STORM 2. X. The Origin of the Interband Continuum Delays in Mrk 817 * * Based in part on observations associated with program GO-16196 made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. (2024)
Journal Article
Netzer, H., Goad, M. R., Barth, A. J., Cackett, E. M., Horne, K., Hu, C., Kara, E., Korista, K. T., Kriss, G. A., Lewin, C., Montano, J., Arav, N., Behar, E., Brotherton, M. S., Chelouche, D., De Rosa, G., Dalla Bontà, E., Dehghanian, M., Ferland, G. J., Fian, C., …Zaidouni, F. (2024). AGN STORM 2. X. The Origin of the Interband Continuum Delays in Mrk 817 * * Based in part on observations associated with program GO-16196 made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. The Astrophysical Journal, 976(1), Article 59. https://doi.org/10.3847/1538-4357/ad8160

The local (z = 0.0315) active galactic nucleus (AGN) Mrk 817 was monitored over more than 500 days with space-borne and ground-based instruments as part of a large international campaign, AGN STORM 2. Here, we present a comprehensive analysis of the... Read More about AGN STORM 2. X. The Origin of the Interband Continuum Delays in Mrk 817 * * Based in part on observations associated with program GO-16196 made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555..

AGN STORM 2. VII. A Frequency-resolved Map of the Accretion Disk in Mrk 817: Simultaneous X-Ray Reverberation and UVOIR Disk Reprocessing Time Lags (2024)
Journal Article
Lewin, C., Kara, E., Barth, A. J., Cackett, E. M., De Rosa, G., Homayouni, Y., Horne, K., Kriss, G. A., Landt, H., Gelbord, J., Montano, J., Arav, N., Bentz, M. C., Boizelle, B. D., Dalla Bontà, E., Brotherton, M. S., Dehghanian, M., Ferland, G. J., Fian, C., Goad, M. R., …Zaidouni, F. (2024). AGN STORM 2. VII. A Frequency-resolved Map of the Accretion Disk in Mrk 817: Simultaneous X-Ray Reverberation and UVOIR Disk Reprocessing Time Lags. Astrophysical Journal, 974(2), 271. https://doi.org/10.3847/1538-4357/ad6b08

X-ray reverberation mapping is a powerful technique for probing the innermost accretion disk, whereas continuum reverberation mapping in the UV, optical, and infrared (UVOIR) reveals reprocessing by the rest of the accretion disk and broad-line regio... Read More about AGN STORM 2. VII. A Frequency-resolved Map of the Accretion Disk in Mrk 817: Simultaneous X-Ray Reverberation and UVOIR Disk Reprocessing Time Lags.

AGN STORM 2. VIII. Investigating the Narrow Absorption Lines in Mrk 817 Using HST-COS Observations* (2024)
Journal Article
Dehghanian, M., Arav, N., Kriss, G. A., Mehdipour, M., Byun, D., Walker, G., Sharma, M., Barth, A. J., Bentz, M. C., Boizelle, B. D., Brotherton, M. S., Cackett, E. M., Dalla Bontà, E., De Rosa, G., Ferland, G. J., Fian, C., Filippenko, A. V., Gelbord, J., Goad, M. R., Horne, K., …Zu, Y. (2024). AGN STORM 2. VIII. Investigating the Narrow Absorption Lines in Mrk 817 Using HST-COS Observations*. Astrophysical Journal, 972(2), Article 141. https://doi.org/10.3847/1538-4357/ad5ff4

AGN STORM 2. V. Anomalous Behavior of the C iv Light Curve of Mrk 817 (2024)
Journal Article
Homayouni, Y., Kriss, G. A., De Rosa, G., Plesha, R., Cackett, E. M., Goad, M. R., …Zu, Y. (2024). AGN STORM 2. V. Anomalous Behavior of the C iv Light Curve of Mrk 817. Astrophysical Journal, 963(2), Article 123. https://doi.org/10.3847/1538-4357/ad1be4

An intensive reverberation mapping campaign of the Seyfert 1 galaxy Mrk 817 using the Cosmic Origins Spectrograph on the Hubble Space Telescope revealed significant variations in the response of broad UV emission lines to fluctuations in the continuu... Read More about AGN STORM 2. V. Anomalous Behavior of the C iv Light Curve of Mrk 817.

First High-resolution Spectroscopy of X-Ray Absorption Lines in the Obscured State of NGC 5548 (2024)
Journal Article
Mehdipour, M., Kriss, G. A., Kaastra, J. S., Costantini, E., Gu, L., Landt, H., …Rogantini, D. (2024). First High-resolution Spectroscopy of X-Ray Absorption Lines in the Obscured State of NGC 5548. Astrophysical Journal, 962(2), Article 155. https://doi.org/10.3847/1538-4357/ad1bcb

Multiwavelength spectroscopy of NGC 5548 revealed remarkable changes due to the presence of an obscuring wind from the accretion disk. This broadened our understanding of obscuration and outflows in active galactic nuclei. Swift monitoring of NGC 554... Read More about First High-resolution Spectroscopy of X-Ray Absorption Lines in the Obscured State of NGC 5548.

AGN STORM 2. VI. Mapping Temperature Fluctuations in the Accretion Disk of Mrk 817 (2024)
Journal Article
Neustadt, J. M. M., Kochanek, C. S., Montano, J., Gelbord, J., Barth, A. J., De Rosa, G., …Zu, Y. (2024). AGN STORM 2. VI. Mapping Temperature Fluctuations in the Accretion Disk of Mrk 817. Astrophysical Journal, 961(2), Article 219. https://doi.org/10.3847/1538-4357/ad1386

We fit the UV/optical lightcurves of the Seyfert 1 galaxy Mrk 817 to produce maps of the accretion disk temperature fluctuations δ T resolved in time and radius. The δ T maps are dominated by coherent radial structures that move slowly (v ≪ c) inward... Read More about AGN STORM 2. VI. Mapping Temperature Fluctuations in the Accretion Disk of Mrk 817.