Staff profile

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
• 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
• Cackett, E. M., Gelbord, J., Barth, A. J., De Rosa, G., Edelson, R., Goad, M. R., …Zaidouni, F. (2023). AGN STORM 2. IV. Swift X-Ray and Ultraviolet/Optical Monitoring of Mrk 817. Astrophysical Journal, 958(2), Article 195. https://doi.org/10.3847/1538-4357/acfdac
• Mitchell, J. A. J., Done, C., Ward, M. J., Kynoch, D., Hagen, S., Lusso, E., & Landt, H. (2023). The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc. Monthly Notices of the Royal Astronomical Society, 524(2), 1796-1825. https://doi.org/10.1093/mnras/stad1830
• Miller, J. A., Cackett, E. M., Goad, M. R., Horne, K., Barth, A. J., Romero-Colmenero, E., …Winkler, H. (2023). Continuum Reverberation Mapping of Mrk 876 over Three Years with Remote Robotic Observatories. Astrophysical Journal, 953(2), Article 137. https://doi.org/10.3847/1538-4357/ace342
• Homayouni, Y., De Rosa, G., Plesha, R., Kriss, G. A., Barth, A. J., Cackett, E. M., …Zu, Y. (2023). AGN STORM 2. II. Ultraviolet Observations of Mrk 817 with the Cosmic Origins Spectrograph on the Hubble Space Telescope*. Astrophysical Journal, 948(2), Article 85. https://doi.org/10.3847/1538-4357/acc45a
• Partington, E. R., Cackett, E. M., Kara, E., Kriss, G. A., Barth, A. J., De Rosa, G., …Zaidouni, F. (2023). AGN STORM 2. III. A NICER View of the Variable X-Ray Obscurer in Mrk 817. Astrophysical Journal, 947(1), Article 2. https://doi.org/10.3847/1538-4357/acbf44
• Kynoch, D., Mitchell, J. A. J., Ward, M. J., Done, C., Lusso, E., & Landt, H. (2023). The SOUX AGN sample: SDSS–XMM-Newton optical, ultraviolet, and X-ray selected active galactic nuclei spanning a wide range of parameter space – sample definition. Monthly Notices of the Royal Astronomical Society, 520(2), 2781-2805. https://doi.org/10.1093/mnras/stad221
• Landt, H., Mitchell, J. A., Ward, M. J., Mercatoris, P., Pott, J., Horne, K., …Winkler, H. (2023). A Complex Dust Morphology in the High-luminosity AGN Mrk 876. Astrophysical Journal, 945(1), Article 62. https://doi.org/10.3847/1538-4357/acb92d
• Homan, D., Lawrence, A., Ward, M., Bruce, A., Landt, H., MacLeod, C., …Peterson, B. M. (2023). The long-term broad-line responsivity in MKN 110. Monthly Notices of the Royal Astronomical Society, 519(2), 1745-1763. https://doi.org/10.1093/mnras/stac3571
• Landt, H. (2023). The outer dusty edge of accretion disks in active galactic nuclei. Frontiers in Astronomy and Space Sciences, 10, 1256088. https://doi.org/10.3389/fspas.2023.1256088
• Mao, J., Kaastra, J., Mehdipour, M., Kriss, G., Wang, Y., Grafton-Waters, S., …Behar, E. (2022). Transient obscuration event captured in NGC 3227 III. Photoionization modeling of the X-ray obscuration event in 2019. Astronomy & Astrophysics, 665, Article A72. https://doi.org/10.1051/0004-6361/202142637
• Gu, L., Mao, J., Kaastra, J. S., Mehdipour, M., Pinto, C., Grafton-Waters, S., …Ward, M. (2022). Detection of an unidentified soft X-ray emission feature in NGC 5548. Astronomy & Astrophysics, 665, Article A93. https://doi.org/10.1051/0004-6361/202244075
• Mehdipour, M., Kriss, G. A., Costantini, E., Gu, L., Kaastra, J. S., Landt, H., & Mao, J. (2022). 10 Yr Transformation of the Obscuring Wind in NGC 5548. Astrophysical Journal Letters, 934(2), https://doi.org/10.3847/2041-8213/ac822f
• Kara, E., Mehdipour, M., Kriss, G. A., Cackett, E. M., Arav, N., Barth, A. J., …Zu, Y. (2021). AGN STORM 2. I. First results: A Change in the Weather of Mrk 817. Astrophysical Journal, 922(2), Article 151. https://doi.org/10.3847/1538-4357/ac2159
• Wildy, C., Landt, H., Ward, M. J., Czerny, B., & Kynoch, D. (2021). Broad He i 1.08-µm absorption from the obscurer in the active galaxy NGC 5548. Monthly Notices of the Royal Astronomical Society: Letters, 500(2), 2063-2075. https://doi.org/10.1093/mnras/staa3301
• Ward, M., Landt, H., Jin, C., Done, C., & Ferland, G. (2020). State-of-the-art AGN SEDs for Photoionization Models: BLR Predictions Confront the Observations. Monthly Notices of the Royal Astronomical Society, 494(4), 5917-5922. https://doi.org/10.1093/mnras/staa1207
• Brown, M., Duncan, K., Landt, H., Kirk, M., Ricci, C., Kamraj, N., …Ananna, T. (2019). The spectral energy distributions of active galactic nuclei. Monthly Notices of the Royal Astronomical Society, 489(3), 3351-3367. https://doi.org/10.1093/mnras/stz2324
• Landt, H., Ward, M., Kynoch, D., Packham, C., Ferland, G., Lawrence, A., …Winkler, H. (2019). The first spectroscopic dust reverberation programme on active galactic nuclei: the torus in NGC 5548. Monthly Notices of the Royal Astronomical Society, 489(2), 1572-1589. https://doi.org/10.1093/mnras/stz2212
• Kynoch, D., Landt, H., Ward, M. J., Done, C., Boisson, C., Baloković, M., …Myserlis, I. (2019). The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS J1222+0413. Monthly Notices of the Royal Astronomical Society, 487(1), 181-197. https://doi.org/10.1093/mnras/stz1193
• Esser, J., Pott, J., Landt, H., & Vacca, W. (2019). Analyzing temporal variations of AGN emission line profiles in the context of (dusty) cloud structure formation in the broad line region. Astronomy & Astrophysics, 621, https://doi.org/10.1051/0004-6361/201834291
• Kynoch, D., Landt, H., Ward, M. J., Done, C., Gardner, E., Boisson, C., …Pereira Santaella, M. (2018). The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342. Monthly Notices of the Royal Astronomical Society, 475(1), 404-423. https://doi.org/10.1093/mnras/stx3161
• Harris, D., Lee, N., Schwartz, D., Siemiginowska, A., Massaro, F., Birkinshaw, M., …Urry, C. (2017). A Multi-band Study of the Remarkable Jet in Quasar 4C+19.44. Astrophysical Journal, 846(2), Article 119. https://doi.org/10.3847/1538-4357/aa845c
• García-Bernete, I., Ramos Almeida, C., Landt, H., Ward, M., Baloković, M., & Acosta-Pulido, J. (2017). The infrared to X-ray correlation spectra of unobscured type 1 active galactic nuclei. Monthly Notices of the Royal Astronomical Society, 469(1), 110-126. https://doi.org/10.1093/mnras/stx795
• Lamperti, I., Koss, M., Trakhtenbrot, B., Schawinski, K., Ricci, C., Oh, K., …Veilleux, S. (2017). BAT AGN Spectroscopic Survey - IV: Near-Infrared Coronal Lines, Hidden Broad Lines, and Correlation with Hard X-ray Emission. Monthly Notices of the Royal Astronomical Society, 467(1), 540-572. https://doi.org/10.1093/mnras/stx055
• Collinson, J., Ward, M., Landt, H., Done, C., Elvis, M., & McDowell, J. (2017). Reaching the peak of the quasar spectral energy distribution – II. Exploring the accretion disc, dusty torus and host galaxy. Monthly Notices of the Royal Astronomical Society, 465(1), 358-382. https://doi.org/10.1093/mnras/stw2666
• Landt, H., Ward, M., Baloković, M., Kynoch, D., Storchi-Bergmann, T., Boisson, C., …Stern, D. (2017). On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342. Monthly Notices of the Royal Astronomical Society, 464(3), 2565-2576. https://doi.org/10.1093/mnras/stw2447
• Landt, H., Martin, E., Ward, M., Bentz, M., Korista, K., & Karovska, M. (2011). The near-infrared broad emission line region of active galactic nuclei – II. The 1-μm continuum. Monthly Notices of the Royal Astronomical Society, 414(1), 218-240. https://doi.org/10.1111/j.1365-2966.2011.18383.x
• Landt, H., Buchanan, C., & Barmby, P. (2010). On the dust geometry in radio-loud active galactic nuclei. Monthly Notices of the Royal Astronomical Society, 408(4), 1982-1997. https://doi.org/10.1111/j.1365-2966.2010.17264.x
• Landt, H., & Bignall, H. (2008). On the relationship between BL Lacertae objects and radio galaxies. Monthly Notices of the Royal Astronomical Society, 391(2), 967-985. https://doi.org/10.1111/j.1365-2966.2008.13967.x
• Landt, H., Padovani, P., Giommi, P., Perri, M., & Cheung, C. (2008). A Search for Synchrotron X-Ray Emission in Radio Quasars. Astrophysical Journal, 676(1), 87-100. https://doi.org/10.1086/527531
• Landt, H., Bentz, M., Ward, M., Elvis, M., Peterson, B., Korista, K., & Karovska, M. (2008). The Near-Infrared Broad Emission Line Region of Active Galactic Nuclei. I. The Observations. Astrophysical Journal Supplement, 174(2), 282-312. https://doi.org/10.1086/522373