All Outputs (5)

The spectral energy distributions of active galactic nuclei (2019)
Journal Article
Brown, M. J. I., Duncan, K. J., 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

We present spectral energy distributions (SEDs) of 41 active galactic nuclei, derived from multiwavelength photometry and archival spectroscopy. All of the SEDs span at least 0.09 to 30 μm, but in some instances wavelength coverage extends into the X... Read More about The spectral energy distributions of active galactic nuclei.

The first spectroscopic dust reverberation programme on active galactic nuclei: the torus in NGC 5548 (2019)
Journal Article
Landt, H., Ward, M. J., Kynoch, D., Packham, C., Ferland, G. J., 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

We have recently initiated the first spectroscopic dust reverberation programme on active galactic nuclei in the near-infrared. Spectroscopy enables measurement of dust properties, such as flux, temperature, and covering factor, with higher precision... Read More about The first spectroscopic dust reverberation programme on active galactic nuclei: the torus in NGC 5548.

The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS J1222+0413 (2019)
Journal Article
Kynoch, D., Landt, H., Ward, M. J., Done, C., Boisson, C., Baloković, M., Angelakis, E., & 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

We present a multi-frequency study of PKS J1222+0413 (4C +04.42), currently the highest redshift γ-ray emitting narrow-line Seyfert 1 (γ-NLS1). We assemble a broad spectral energy distribution (SED) including previously unpublished datasets: X-ray da... Read More about The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS J1222+0413.

The ‘Big Dipper’: the nature of the extreme variability of the AGN SDSS J2232−0806 (2019)
Journal Article
Kynoch, D., Ward, M. J., Lawrence, A., Bruce, A. G., Landt, H., & MacLeod, C. L. (2019). The ‘Big Dipper’: the nature of the extreme variability of the AGN SDSS J2232−0806. Monthly Notices of the Royal Astronomical Society, 485(2), 2573-2588. https://doi.org/10.1093/mnras/stz517

SDSS J2232−0806 (the ‘Big Dipper’) has been identified as a ‘slow-blue nuclear hypervariable’: a galaxy with no previously known active nucleus, blue colours, and large-amplitude brightness evolution occurring on a time-scale of years. Subsequent obs... Read More about The ‘Big Dipper’: the nature of the extreme variability of the AGN SDSS J2232−0806.

Analyzing temporal variations of AGN emission line profiles in the context of (dusty) cloud structure formation in the broad line region (2019)
Journal Article
Esser, J., Pott, J. U., Landt, H., & Vacca, W. D. (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

The formation processes and the exact appearance of the dust torus and broad line region (BLR) of active galactic nuclei (AGN) are under debate. Theoretical studies show a possible connection between the dust torus and BLR through a common origin in... Read More about Analyzing temporal variations of AGN emission line profiles in the context of (dusty) cloud structure formation in the broad line region.