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BAT AGN Spectroscopic Survey - IV: Near-Infrared Coronal Lines, Hidden Broad Lines, and Correlation with Hard X-ray Emission (2017)
Journal Article
Lamperti, I., Koss, M., Trakhtenbrot, B., Schawinski, K., Ricci, C., Oh, K., Landt, H., Riffel, R., Rodríguez-Ardila, A., Gehrels, N., Harrison, F., Masetti, N., Mushotzky, R., Treister, E., Ueda, Y., & 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

We provide a comprehensive census of the near-infrared (NIR, 0.8–2.4 μm) spectroscopic properties of 102 nearby (z < 0.075) active galactic nuclei (AGN), selected in the hard X-ray band (14–195 keV) from the Swift-Burst Alert Telescope survey. With t... Read More about BAT AGN Spectroscopic Survey - IV: Near-Infrared Coronal Lines, Hidden Broad Lines, and Correlation with Hard X-ray Emission.

Reaching the peak of the quasar spectral energy distribution – II. Exploring the accretion disc, dusty torus and host galaxy (2016)
Journal Article
Collinson, J. S., Ward, M. J., Landt, H., Done, C., Elvis, M., & McDowell, J. C. (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

We continue our study of the spectral energy distributions (SEDs) of 11 active galactic nuclei (AGN) at 1.5 < z < 2.2, with optical–near-infrared (NIR) spectra, X-ray data and mid-IR photometry. In a previous paper, we presented the observations and... Read More about Reaching the peak of the quasar spectral energy distribution – II. Exploring the accretion disc, dusty torus and host galaxy.

On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342 (2016)
Journal Article
Landt, H., Ward, M. J., Baloković, M., Kynoch, D., Storchi-Bergmann, T., Boisson, C., Done, C., Schimoia, J., & 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

Narrow-line Seyfert 1 galaxies have been identified by the Fermi Gamma-Ray Space Telescope as a rare class of γ-ray emitting active galactic nuclei. The lowest redshift candidate among them is the source 1H 0323+342. Here we present quasi-simultaneou... Read More about On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342.

The near-infrared broad emission line region of active galactic nuclei – II. The 1-μm continuum (2011)
Journal Article
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

We use quasi-simultaneous near-infrared (near-IR) and optical spectroscopy from four observing runs to study the continuum around 1 μm in 23 well-known broad emission line active galactic nuclei (AGN). We show that, after correcting the optical spect... Read More about The near-infrared broad emission line region of active galactic nuclei – II. The 1-μm continuum.

On the dust geometry in radio-loud active galactic nuclei. (2010)
Journal Article
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

We use photometric and spectroscopic infrared observations obtained with the Spitzer Space Telescope of 12 radio-loud active galactic nuclei to investigate the dust geometry. Our approach is to look at the change of the infrared spectral energy distr... Read More about On the dust geometry in radio-loud active galactic nuclei..

On the relationship between BL Lacertae objects and radio galaxies. (2008)
Journal Article
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

We present deep radio images at 1.4 GHz of a large and complete sample of BL Lacertae objects (BL Lacs) selected from the Deep X-ray Radio Blazar Survey (DXRBS). We have observed 24 northern (δ≳− 30°) sources with the Very Large Array (VLA) in both i... Read More about On the relationship between BL Lacertae objects and radio galaxies..

A Search for Synchrotron X-Ray Emission in Radio Quasars (2008)
Journal Article
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

This paper presents XMM-Newton and Chandra X-ray spectroscopy of 10 flat-spectrum radio quasars (FSRQ) that are candidates to have an X-ray spectrum dominated by jet synchrotron emission. In all these FSRQ, which are less strongly relativistically be... Read More about A Search for Synchrotron X-Ray Emission in Radio Quasars.