Outputs (131)

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.

ALMACAL IX: Multiband ALMA survey for dusty star-forming galaxies and the resolved fractions of the cosmic infrared background (2022)
Journal Article
Chen, J., Ivison, R., Zwaan, M. A., Smail, I., Klitsch, A., Péroux, C., Popping, G., Biggs, A. D., Szakacs, R., Hamanowicz, A., & Lagos, C. (2023). ALMACAL IX: Multiband ALMA survey for dusty star-forming galaxies and the resolved fractions of the cosmic infrared background. Monthly Notices of the Royal Astronomical Society, 518(1), 1378-1397. https://doi.org/10.1093/mnras/stac2989

Wide, deep, blind continuum surveys at submillimetre/millimetre (submm/mm) wavelengths are required to provide a full inventory of the dusty, distant Universe. However, conducting such surveys to the necessary depth, with sub-arcsec angular resolutio... Read More about ALMACAL IX: Multiband ALMA survey for dusty star-forming galaxies and the resolved fractions of the cosmic infrared background.

A Magnetic Valve at L1 Revealed in TESS Photometry of the Asynchronous Polar BY Cam (2022)
Journal Article
Mason, P. A., Littlefield, C., Monroy, L. C., Morales, J. F., Hakala, P., Garnavich, P., Szkody, P., Kennedy, M. R., Ramsay, G., & Scaringi, S. (2022). A Magnetic Valve at L1 Revealed in TESS Photometry of the Asynchronous Polar BY Cam. Astrophysical Journal, 938(2), https://doi.org/10.3847/1538-4357/ac91cf

We present TESS photometry of the asynchronous polar BY Cam, which undergoes a beat cycle between the 199.384 min white dwarf (WD) spin period and the 201.244 min orbital period. This results in changes in the flow of matter onto the WD. The TESS lig... Read More about A Magnetic Valve at L1 Revealed in TESS Photometry of the Asynchronous Polar BY Cam.

Signatures of extended discs and outflows in the circumgalactic medium using the Q0107 quasar triplet (2022)
Journal Article
Beckett, A., Morris, S. L., Fumagalli, M., Tejos, N., Jannuzi, B., & Cantalupo, S. (2022). Signatures of extended discs and outflows in the circumgalactic medium using the Q0107 quasar triplet. Monthly Notices of the Royal Astronomical Society, 517(1), 1020-1047. https://doi.org/10.1093/mnras/stac2630

We use H I absorption along the lines-of-sight to the Q0107 quasar triplet in order to model potential disc and outflow structures in the circumgalactic medium of intervening galaxies at z ≲ 1, as well as the intergalactic medium on scales of up to a... Read More about Signatures of extended discs and outflows in the circumgalactic medium using the Q0107 quasar triplet.

A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems (2022)
Journal Article
Andonie, C., Alexander, D. M., Rosario, D., Laloux, B., Georgakakis, A., Morabito, L. K., Villforth, C., Avirett-Mackenzie, M., Rivera, G. C., Del Moro, A., Fotopoulou, S., Harrison, C., Lapi, A., Petley, J., Petter, G., & Shankar, F. (2022). A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems. Monthly Notices of the Royal Astronomical Society, 517(2), 2577-2598. https://doi.org/10.1093/mnras/stac2800

To understand the active galactic nuclei (AGNs) phenomenon and their impact on the evolution of galaxies, a complete AGN census is required; however, finding heavily obscured AGNs is observationally challenging. Here we use the deep and extensive mul... Read More about A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems.

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.

Stellar feedback in M 83 as observed with MUSE II. Analysis of the H II region population: Ionisation budget and pre-SN feedback (2022)
Journal Article
Della Bruna, L., Adamo, A., McLeod, A. F., Smith, L. J., Savard, G., Robert, C., Sun, J., Amram, P., Bik, A., Blair, W. P., Long, K. S., Renaud, F., Walterbos, R., & Usher, C. (2022). Stellar feedback in M 83 as observed with MUSE II. Analysis of the H II region population: Ionisation budget and pre-SN feedback. Astronomy & Astrophysics, 666, Article A29. https://doi.org/10.1051/0004-6361/202243395

Context. Energy and momentum injected by young, massive stars into the surrounding gas play an important role in regulating further star formation and in determining the galaxy’s global properties. Before supernovae begin to explode, stellar feedback... Read More about Stellar feedback in M 83 as observed with MUSE II. Analysis of the H II region population: Ionisation budget and pre-SN feedback.

Automated galaxy-galaxy strong lens modelling: No lens left behind (2022)
Journal Article
Etherington, A., Nightingale, J. W., Massey, R., Cao, X., Robertson, A., Amorisco, N. C., Amvrosiadis, A., Cole, S., Frenk, C. S., He, Q., Li, R., & Tam, S.-I. (2022). Automated galaxy-galaxy strong lens modelling: No lens left behind. Monthly Notices of the Royal Astronomical Society, 517(3), 3275-3302. https://doi.org/10.1093/mnras/stac2639

The distribution of dark and luminous matter can be mapped around galaxies that gravitationally lens background objects into arcs or Einstein rings. New surveys will soon observe hundreds of thousands of galaxy lenses, and current, labour-intensive a... Read More about Automated galaxy-galaxy strong lens modelling: No lens left behind.

Reconstruction of the emissivity and flow for Doppler coherence imaging spectroscopy (CIS) on J-TEXT (2022)
Journal Article
Li, B., Wang, T., Nie, L., Long, T., Zhang, X., Sharples, R., Xu, M., Wang, Z., Chen, Z., Wu, H., Liu, Z., Ke, R., Zhang, X., Jiao, S., Qing, W., Tian, Y., & Pan, Y. (2022). Reconstruction of the emissivity and flow for Doppler coherence imaging spectroscopy (CIS) on J-TEXT. Fusion Engineering and Design, 184, Article 113271. https://doi.org/10.1016/j.fusengdes.2022.113271

Doppler coherence imaging spectroscopy (CIS) has been installed on J-TEXT tokamak to provide a wealth of information for carbon impurity ions (CIII). To obtain the local emissivity and flow from the line-integrated information measured by the camera,... Read More about Reconstruction of the emissivity and flow for Doppler coherence imaging spectroscopy (CIS) on J-TEXT.

Harvesting the Lyα forest with convolutional neural networks (2022)
Journal Article
Cheng, T.-Y., Cooke, R. J., & Rudie, G. (2022). Harvesting the Lyα forest with convolutional neural networks. Monthly Notices of the Royal Astronomical Society, 517, 755-775. https://doi.org/10.1093/mnras/stac2631

We develop a machine learning based algorithm using a convolutional neural network (CNN) to identify low H I column density Lyα absorption systems (log NHI/cm−2 < 17) in the Lyα forest, and predict their physical properties, such as their H I column... Read More about Harvesting the Lyα forest with convolutional neural networks.

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.

Locating the flickering source in polars (2022)
Journal Article
Iłkiewicz, K., Scaringi, S., Littlefield, C., & Mason, P. A. (2022). Locating the flickering source in polars. Monthly Notices of the Royal Astronomical Society, 516(4), https://doi.org/10.1093/mnras/stac2597

Flickering is a fast variability observed in all accreting systems. It has been shown that in most cataclysmic variables flickering originates in the accretion disc. However, in polars the strong magnetic field of the white dwarf prevents the formati... Read More about Locating the flickering source in polars.

Transient obscuration event captured in NGC 3227 III. Photoionization modeling of the X-ray obscuration event in 2019 (2022)
Journal Article
Mao, J., Kaastra, J., Mehdipour, M., Kriss, G., Wang, Y., Grafton-Waters, S., Branduardi-Raymont, G., Pinto, C., Landt, H., Walton, D., Costantini, E., Di Gesu, L., Bianchi, S., Petrucci, P.-O., De Marco, B., Ponti, G., Fukazawa, Y., Ebrero, J., & 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

Context. A growing number of transient X-ray obscuration events in type I active galactic nuclei suggest that our line of sight to the central engine is not always free. Multiple X-ray obscuration events were reported in the nearby Seyfert 1.5 galaxy... Read More about Transient obscuration event captured in NGC 3227 III. Photoionization modeling of the X-ray obscuration event in 2019.

A light-cone catalogue from the Millennium-XXL simulation: improved spatial interpolation and colour distributions for the DESI BGS (2022)
Journal Article
Smith, A., Cole, S., Grove, C., Norberg, P., & Zarrouk, P. (2022). A light-cone catalogue from the Millennium-XXL simulation: improved spatial interpolation and colour distributions for the DESI BGS. Monthly Notices of the Royal Astronomical Society, 516(3), 4529 - 4542. https://doi.org/10.1093/mnras/stac2519

The use of realistic mock galaxy catalogues is essential in the preparation of large galaxy surveys, in order to test and validate theoretical models and to assess systematics. We present an updated version of the mock catalogue constructed from the... Read More about A light-cone catalogue from the Millennium-XXL simulation: improved spatial interpolation and colour distributions for the DESI BGS.

Warm molecular and ionized gas kinematics in the type-2 quasar J0945+1737 (2022)
Journal Article
Speranza, G., Ramos Almeida, C., Acosta-Pulido, J., Riffel, R., Tadhunter, C., Pierce, J., Rodríguez-Ardila, A., Coloma Puga, M., Brusa, M., Musiimenta, B., Alexander, D., Lapi, A., Shankar, F., & Villforth, C. (2022). Warm molecular and ionized gas kinematics in the type-2 quasar J0945+1737. Astronomy & Astrophysics, 665, Article A55. https://doi.org/10.1051/0004-6361/202243585

We analyse Near-Infrared Integral Field Spectrograph (NIFS) observations of the type-2 quasar (QSO2) SDSS J094521.33+173753.2 to investigate its warm molecular and ionized gas kinematics. This QSO2 has a bolometric luminosity of 1045.7 erg s−1 and a... Read More about Warm molecular and ionized gas kinematics in the type-2 quasar J0945+1737.

The Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) (2022)
Journal Article
Claeyssens, A., Richard, J., Blaizot, J., Garel, T., Kusakabe, H., Bacon, R., Bauer, F., Guaita, L., Jeanneau, A., Lagattuta, D., Leclercq, F., Maseda, M., Matthee, J., Nanayakkara, T., Pello, R., Thai, T., Tuan-Anh, P., Verhamme, A., Vitte, E., & Wisotzki, L. (2022). The Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS). Astronomy & Astrophysics, 666, Article A78. https://doi.org/10.1051/0004-6361/202142320

Aims. We present the Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) selected from MUSE and HST observations of 17 lensing clusters. The sample consists of 603 continuum-faint (−23 < MUV < −14) lensed Lyman-α emitters (producing 959 images) with secure...

NuSTAR Observations of Intrinsically X-Ray Weak Quasar Candidates: An Obscuration-only Scenario (2022)
Journal Article
Wang, C., Luo, B., Brandt, W., Alexander, D., Bauer, F., Gallagher, S., Huang, J., Liu, H., & Stern, D. (2022). NuSTAR Observations of Intrinsically X-Ray Weak Quasar Candidates: An Obscuration-only Scenario. Astrophysical Journal, 936(2), Article 95. https://doi.org/10.3847/1538-4357/ac886e

We utilize recent NuSTAR observations (co-added depth ≈55–120 ks) of PG 1001+054, PG 1254+047, and PHL 1811 to constrain their hard X-ray (≳5 keV) weakness and spectral shapes and thus to investigate the nature of their extreme X-ray weakness. These... Read More about NuSTAR Observations of Intrinsically X-Ray Weak Quasar Candidates: An Obscuration-only Scenario.

Design of the VLT-CUBES image slicers: Field re-formatters to provide two spectral resolutions (2022)
Journal Article
Calcines, A., Wells, M., O’Brien, K., Morris, S., Seifert, W., Zanutta, A., Evans, C., & Di Marcantonio, P. (2023). Design of the VLT-CUBES image slicers: Field re-formatters to provide two spectral resolutions. Experimental Astronomy, 55(1), 267-280. https://doi.org/10.1007/s10686-022-09866-5

CUBES is a high efficiency spectrograph designed for a Cassegrain focus of the Very Large Telescope and is expected to be in operation in 2028. It is designed to observe point or compact sources in a spectral range from 300 to 405nm. CUBES will provi... Read More about Design of the VLT-CUBES image slicers: Field re-formatters to provide two spectral resolutions.

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.

Unveiling the disc structure in ultraluminous X-ray source NGC 55 ULX-1 (2022)
Journal Article
Barra, F., Pinto, C., Walton, D., Kosec, P., D’Aì, A., Di Salvo, T., Del Santo, M., Earnshaw, H., Fabian, A., Fuerst, F., Marino, A., Pintore, F., Robba, A., & Roberts, T. (2022). Unveiling the disc structure in ultraluminous X-ray source NGC 55 ULX-1. Monthly Notices of the Royal Astronomical Society, 516(3), 3972-3983. https://doi.org/10.1093/mnras/stac2453

Ultraluminous X-ray sources (ULXs) are the most extreme among X-ray binaries in which the compact object, a neutron star or a black hole, accretes matter from the companion star, and exceeds a luminosity of 1039 ergs−1 in the X-ray energy band alone.... Read More about Unveiling the disc structure in ultraluminous X-ray source NGC 55 ULX-1.