Zobrazeno 1 - 10
of 1 047
pro vyhledávání: '"Bernal, S. A."'
Autor:
Hernández-García, L., Muñoz-Arancibia, A. M., Lira, P., Bruni, G., Cuadra, J., Arévalo, P., Sánchez-Sáez, P., Bernal, S., Bauer, F. E., Catelan, M., Panessa, F., Pávez-Herrera, M., Ricci, C., Reyes-Jainaga, I., Ailawadhi, B., Chavushyan, V., Dastidar, R., Deconto-Machado, A., Förster, F., Gangopadhyay, A., García-Pérez, A., Márquez, I., Masegosa, J., Misra, K., Patiño-Alvarez, V. M, Puig-Subirà, M., Rodi, J., Singh, M.
With a growing number of facilities able to monitor the entire sky and produce light curves with a cadence of days, in recent years there has been an increased rate of detection of sources whose variability deviates from standard behavior, revealing
Externí odkaz:
http://arxiv.org/abs/2411.08949
Context. Quasar variability can potentially unlock crucial insights into the accretion process. Understanding how this variability is influenced by wavelength is crucial for validating and refining quasar variability models. Aims. This paper aims to
Externí odkaz:
http://arxiv.org/abs/2409.14999
Autor:
Sánchez-Sáez, P., Hernández-García, L., Bernal, S., Bayo, A., Rivera, G. Calistro, Bauer, F. E., Ricci, C., Merloni, A., Graham, M. J., Cartier, R., Arévalo, P., Assef, R. J., Concas, A., Homan, D., Krumpe, M., Lira, P., Malyali, A., Martínez-Aldama, M. L., Arancibia, A. M. Muñoz, Rau, A., Bruni, G., Förster, F., Pavez-Herrera, M., Tubín-Arenas, D., Brightman, M.
The galaxy SDSS1335+0728, which had exhibited no prior optical variations during the preceding two decades, began showing significant nuclear variability in the Zwicky Transient Facility (ZTF) alert stream from December 2019 (as ZTF19acnskyy). Its be
Externí odkaz:
http://arxiv.org/abs/2406.11983
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:
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:
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:
Bolaños-Bernal, S. E.1 sebolanosb@unal.edu.co, Monsalve-Arias, M. J.1 momonsalvea@unal.edu.co, Rodriguez-Baracaldo, R.1 rodriguezba@unal.edu.co
Publikováno v:
Scientia et Technica. jul-sep2024, Vol. 29 Issue 3, p109-115. 7p.
Autor:
Bernal, S. Silvente1 ssbcpe@gmail.com, Vallejo, O. Girón1, Sánchez, A. Sánchez1, Hernández, C. Menacho1, Berrío, J. Rodón1, Parra Gelder, B. A.1
Publikováno v:
Cirugía Pediátrica (English Edition). Jul2024, Vol. 37 Issue 3, p116-122. 7p.