Zobrazeno 1 - 10
of 976
pro vyhledávání: '"López-Navas A."'
Autor:
Arévalo, P., López-Navas, E., Martínez-Aldama, M. L., Lira, P., Bernal, S., Sánchez-Sáez, P., Salvato, M., Hernández-García, L., Ricci, C., Merloni, A., Krumpe, M.
Publikováno v:
A&A 683, L8 (2024)
We report on the finding of a newborn AGN, i.e. current AGN activity in a galaxy previously classified as non-active, and characterize its evolution. Black hole ignition event candidates were selected from a parent sample of spectrally classified non
Externí odkaz:
http://arxiv.org/abs/2402.19403
Autor:
López-Navas, E., Sánchez-Sáez, P., Arévalo, P., Bernal, S., Graham, M. J., Hernández-García, L., Homan, D., Krumpe, M., Lamer, G., Lira, P., Martínez-Aldama, M. L., Merloni, A., Ríos, S., Salvato, M., Stern, D., Tubín-Arenas, D.
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 2023; stad1893
We present second epoch optical spectra for 30 changing-look (CL) candidates found by searching for Type-1 optical variability in a sample of active galactic nuclei (AGNs) spectroscopically classified as Type 2. We use a random-forest-based light cur
Externí odkaz:
http://arxiv.org/abs/2306.13808
Autor:
Arevalo, P., Churazov, E., Lira, P., Sanchez-Saez, P., Bernal, S., Hernandez-Garcia, L., Lopez-Navas, E., Patel, P.
Aims: Establish the dependence of variability properties, such as characteristic timescales and variability amplitude, on basic quasar parameters such as black hole mass and accretion rate, controlling for the rest-frame wavelength of emission. Metho
Externí odkaz:
http://arxiv.org/abs/2306.11099
Autor:
Arévalo, Patricia, Lira, Paulina, Sánchez-Sáez, Paula, Patel, Priyanjali, López-Navas, Elena, Churazov, Eugene, Hernández-García, Lorena
Quasars emission is highly variable, and this variability gives us clues to understand the accretion process onto supermassive black holes. We can expect variability properties to correlate with the main physical properties of the accreting black hol
Externí odkaz:
http://arxiv.org/abs/2304.14228
Autor:
da Silva, Patrícia, Menezes, R. B., Díaz, Y., Rodríguez-Ardila, A., López-Navas, E., Arévalo, P., Hernández-García, L.
The central regions of galaxies harbouring active galactic nuclei (AGNs) can be quite complex, especially at high activity, presenting, besides variability, a variety of phenomena related, e.g. to ionization/excitation mechanisms. A detailed study is
Externí odkaz:
http://arxiv.org/abs/2212.11434
Autor:
López-Navas, E., Arévalo, P., Bernal, S., Graham, Matthew J., Hernández-García, L., Lira, P., Sánchez-Sáez, P.
The scarce optical variability studies in spectrally classified Type 2 active galactic nuclei (AGNs) have led to the discovery of anomalous objects that are incompatible with the simplest unified models (UM). This paper focuses on the exploration of
Externí odkaz:
http://arxiv.org/abs/2211.00770
Autor:
Díaz, Y., Hernández-García, L., Arévalo, P., López-Navas, E., Ricci, C., Koss, M., González-Martín, O., Baloković, M., Osorio-Clavijo, N., García, J., Malizia, A.
Publikováno v:
A&A 669, A114 (2023)
An interesting feature in active galactic nuclei (AGN) accreting at low rate is the weakness of the reflection features in their X-ray spectra, which can result from the gradual disappearance of the torus with decreasing accretion rates. It has been
Externí odkaz:
http://arxiv.org/abs/2210.15376
Publikováno v:
Tourism and Hospitality, Vol 5, Iss 1, Pp 237-250 (2024)
Little research has been conducted specifically on emotional intelligence (EI) and perceived quality of service in the hospitality industry. The main goal of this research consists of providing empirical evidence related to EI regarding its importanc
Externí odkaz:
https://doaj.org/article/791ff2cafd174cfbb9ba0491f0b895ca
Autor:
López-Navas, E., Martínez-Aldama, M. L., Bernal, S., Sánchez-Sáez, P., Arévalo, P., Graham, Matthew J., Hernández-García, L., Lira, P., Lobos, P. A. Rojas
Determining the frequency and duration of changing--look (CL) active galactic nuclei (AGNs) phenomena, where the optical broad emission lines appear or disappear, is crucial to understand the evolution of the accretion flow around supermassive black
Externí odkaz:
http://arxiv.org/abs/2203.15040
Autor:
Antonio Ríos, Joaquín Carrillo, Ana Isabel López-Navas, Marco Antonio Ayala-García, Felipe Alconchel, Pablo Ramírez
Publikováno v:
Nefrología (English Edition), Vol 44, Iss 1, Pp 100-102 (2024)
Externí odkaz:
https://doaj.org/article/619ab6e67b4342da96f9a5ba1860895a