Outputs (7)

Launching the VASCO Citizen Science Project (2022)
Journal Article
Villarroel, B., Pelckmans, K., Solano, E., Laaksoharju, M., Souza, A., Dom, O. N., Laggoune, K., Mimouni, J., Guergouri, H., Mattsson, L., García, A. L., Soodla, J., Castillo, D., Shultz, M. E., Aworka, R., Comerón, S., Geier, S., Marcy, G. W., Gupta, A. C., Bergstedt, J., …Ward, M. J. (2022). Launching the VASCO Citizen Science Project. Universe, 8(11), Article 561. https://doi.org/10.3390/universe8110561

The Vanishing & Appearing Sources during a Century of Observations (VASCO) project investigates astronomical surveys spanning a time interval of 70 years, searching for unusual and exotic transients. We present herein the VASCO Citizen Science Projec... Read More about Launching the VASCO Citizen Science Project.

A high angular resolution view of the PAH emission in Seyfert galaxies using JWST/MRS data (2022)
Journal Article
García-Bernete, I., Rigopoulou, D., Alonso-Herrero, A., Donnan, F., Roche, P., Pereira-Santaella, M., Labiano, A., Peralta de Arriba, L., Izumi, T., Ramos Almeida, C., Shimizu, T., Hönig, S., García-Burillo, S., Rosario, D., Ward, M., Bellocchi, E., Hicks, E., Fuller, L., & Packham, C. (2022). A high angular resolution view of the PAH emission in Seyfert galaxies using JWST/MRS data. Astronomy & Astrophysics, 666, Article L5. https://doi.org/10.1051/0004-6361/202244806

Polycyclic aromatic hydrocarbons (PAHs) are carbon-based molecules that are ubiquitous in a variety of astrophysical objects and environments. In this work we use JWST/MIRI MRS spectroscopy of three Seyferts to compare their nuclear PAH emission with... Read More about A high angular resolution view of the PAH emission in Seyfert galaxies using JWST/MRS data.

Detection of an unidentified soft X-ray emission feature in NGC 5548 (2022)
Journal Article
Gu, L., Mao, J., Kaastra, J. S., Mehdipour, M., Pinto, C., Grafton-Waters, S., Bianchi, S., Landt, H., Branduardi-Raymont, G., Costantini, E., Ebrero, J., Petrucci, P.-O., Behar, E., di Gesu, L., De Marco, B., Matt, G., Mitchell, J. A., Peretz, U., Ursini, F., & 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

Context. NGC 5548 is an X-ray bright Seyfert 1 active galaxy. It exhibits a variety of spectroscopic features in the soft X-ray band, in particular including the absorption by the active galactic nucleus (AGN) outflows of a broad range of ionization... Read More about Detection of an unidentified soft X-ray emission feature in NGC 5548.

Multiple locations of near-infrared coronal lines in NGC 5548 (2022)
Journal Article
Kynoch, D., Landt, H., Dehghanian, M., Ward, M. J., & Ferland, G. J. (2022). Multiple locations of near-infrared coronal lines in NGC 5548. Monthly Notices of the Royal Astronomical Society, 516(3), https://doi.org/10.1093/mnras/stac2443

We present the first intensive study of the variability of the near-infrared coronal lines in an active galactic nucleus (AGN). We use data from a 1-yr-long spectroscopic monitoring campaign with roughly weekly cadence on NGC 5548 to study the variab... Read More about Multiple locations of near-infrared coronal lines in NGC 5548.

Multiwavelength campaign on the Super-Eddington NLS1 RX J0134.2-4258 – I. Peculiar X-ray spectra and variability (2022)
Journal Article
Jin, C., Done, C., Ward, M., Panessa, F., Liu, B., & Liu, H. (2022). Multiwavelength campaign on the Super-Eddington NLS1 RX J0134.2-4258 – I. Peculiar X-ray spectra and variability. Monthly Notices of the Royal Astronomical Society, 512(4), 5642-5656. https://doi.org/10.1093/mnras/stac827

We have conducted a new long-term multiwavelength campaign on one of the most super-Eddington narrow-line Seyfert 1s (NLS1s) known, namely RX J0134.2-4258. In this first paper, we report deep simultaneous X-ray observations performed by XMM–Newton an... Read More about Multiwavelength campaign on the Super-Eddington NLS1 RX J0134.2-4258 – I. Peculiar X-ray spectra and variability.

A glint in the eye: Photographic plate archive searches for non-terrestrial artefacts (2022)
Journal Article
Villarroel, B., Mattsson, L., Guergouri, H., Solano, E., Geier, S., Dom, O. N., & Ward, M. J. (2022). A glint in the eye: Photographic plate archive searches for non-terrestrial artefacts. Acta Astronautica, 194, 106-113. https://doi.org/10.1016/j.actaastro.2022.01.039

In this paper, we present a simple strategy to identify Non-Terrestrial artefacts [NTAs; Haqq-Misra and Kopparapu (2012)] in or near geosynchronous Earth orbits (GEOs). We show that even the small pieces of reflective debris in orbit around the Earth... Read More about A glint in the eye: Photographic plate archive searches for non-terrestrial artefacts.

X-ray intraday variability and power spectral density profiles of the blazar 3C 273 with XMM–Newton during 2000–2021 (2022)
Journal Article
Pavana Gowtami, G., Gaur, H., Gupta, A. C., Wiita, P. J., Liao, M., & Ward, M. (2022). X-ray intraday variability and power spectral density profiles of the blazar 3C 273 with XMM–Newton during 2000–2021. Monthly Notices of the Royal Astronomical Society, 511(2), 3101-3112. https://doi.org/10.1093/mnras/stac286

We present X-ray intraday variability and power spectral density (PSD) analyses of the longest 23 pointed XMM–Newton observations of the blazar 3C 273 that were taken during 2000–2021. These good time intervals contain between 5 and 24.6 h of data. V... Read More about X-ray intraday variability and power spectral density profiles of the blazar 3C 273 with XMM–Newton during 2000–2021.