Search Publications
Polycyclic aromatic hydrocarbons in Seyfert and star-forming galaxies
Rigopoulou, D.; Pereira-Santaella, M.; Alonso-Herrero, A. +3 more
Polycyclic Aromatic Hydrocarbons (PAHs) are carbon-based molecules resulting from the union of aromatic rings and related species, which are likely responsible for strong infrared emission features. In this work, using a sample of 50 Seyfert galaxies (DL < 100 Mpc) we compare the circumnuclear (inner kpc) PAH emission of AGN to that …
Mira variables in the Milky Way's nuclear stellar disc: discovery and classification
Smith, Leigh C.; Matsunaga, Noriyuki; Minniti, Dante +3 more
The properties of the Milky Way's nuclear stellar disc give crucial information on the epoch of bar formation. Mira variables are promising bright candidates to study the nuclear stellar disc, and through their period-age relation dissect its star formation history. We report on a sample of 1782 Mira variable candidates across the central $3\times…
Planetary nebulae with Wolf-Rayet-type central stars - III. A detailed view of NGC 6905 and its central star
Guerrero, M. A.; Toalá, J. A.; Todt, H. +6 more
We present a multiwavelength characterization of the planetary nebula (PN) NGC 6905 and its [Wolf-Rayet]-type ([WR]) central star (CSPN) HD 193949. Our Nordic Optical Telescope Alhambra Faint Object Spectrograph and Camera (ALFOSC) spectra and images unveil in unprecedented detail the high-ionization structure of NGC 6905. The high-quality spectra…
Revisiting the evolved hypergiants in the Magellanic Clouds
Borges Fernandes, M.; Kraus, M.; Maravelias, G. +2 more
The massive stars that survive the phase of red supergiants (RSGs) spend the rest of their life in extremity. Their unstable atmospheres facilitate the formation and episodic ejection of shells that alter the stellar appearance and surroundings. In the present study, we revise the evolutionary state of eight hypergiants in the Magellanic Clouds, f…
Galaxy source counts at 7.7, 10, and 15 µm with the James Webb Space Telescope
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +7 more
We present mid-infrared (IR) galaxy number counts based on the Early Release Observations obtained by the James Webb Space Telescope (JWST) at 7.7-, 10-, and 15-µm (F770W, F1000W, and F1500W, respectively) bands of the Mid-Infrared Instrument (MIRI). Due to the superior sensitivity of JWST, the 80-per cent completeness limits reach 0.32, 0.7…
SU Lyn - a transient symbiotic star
Iłkiewicz, Krystian; Mikołajewska, Joanna; Scaringi, Simone +3 more
SU Lyn is a binary system composed of a white dwarf and a red giant star. Although it is known to be bright and variable at X-ray wavelengths, the optical counterpart of the source appeared as a single red giant without prominent emission lines. Because of the lack of optical features typical for interacting systems, the system was classified as a…
Multiwavelength properties of 850-µm selected sources from the North Ecliptic Pole SCUBA-2 survey
Goto, Tomotsugu; Kim, Seong Jin; Conselice, Christopher J. +25 more
We present the multiwavelength counterparts of 850-$\mu$m selected submillimetre sources over a 2-deg2 field centred on the North Ecliptic Pole. In order to overcome the large beam size (15 arcsec) of the 850-$\mu$m images, deep optical to near-infrared (NIR) photometric data and arcsecond-resolution 20-cm images are used to identify co…
The search for gas in debris discs: ALMA detection of CO gas in HD 36546
Henning, Thomas; Villaver, Eva; Rivière-Marichalar, Pablo +9 more
Debris discs represent the last stages of planet formation and as such are expected to be depleted of primordial gas. None the less, in the last few years the presence of cold gas has been reported in ~20 debris discs from far-infrared to (sub-)mm observations and hot gas has been observed in the optical spectra of debris discs for decades. While …
Asteroid phase curves using sparse Gaia DR2 data and differential dense light curves
Shevchenko, V.; Kwiatkowski, T.; Oszkiewicz, D. +10 more
The amount of sparse asteroid photometry being gathered by both space- and ground-based surveys is growing exponentially. This large volume of data poses a computational challenge owing to both the large amount of information to be processed and the new methods needed to combine data from different sources (e.g. obtained by different techniques, i…
Identifying the population of stable ν6 resonant asteroids using large data bases
Carruba, V.; Aljbaae, S.; Domingos, R. C. +2 more
Large observational surveys, like those that will be conducted at the Vera C. Rubin Observatory, are expected to discover up to one million new asteroids in the first year of operation. This will more than double the data base of known asteroids. New methods will be needed to handle the large influx of data. Here, we tested some of these new appro…