{"id":25741,"date":"2023-03-21T08:30:00","date_gmt":"2023-03-21T08:30:00","guid":{"rendered":"https:\/\/astrofisicamas.cl\/nuevaweb\/?p=25741"},"modified":"2023-10-05T19:06:49","modified_gmt":"2023-10-05T19:06:49","slug":"astronomos-convierten-en-sonido-datos-de-zona-de-formacion-de-planetas-estudiada-con-observatorio-alma","status":"publish","type":"post","link":"https:\/\/astrofisicamas.cl\/en\/astronomos-convierten-en-sonido-datos-de-zona-de-formacion-de-planetas-estudiada-con-observatorio-alma\/","title":{"rendered":"Astronomers Discover First Galaxy that Changes its Classification on Unusual Activity in its AGN Nucleus"},"content":{"rendered":"
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It is PBC J2333.9-2343, a radio galaxy that happened to have a blazar in its core, high-energy objects and one of the most powerful ever studied in the Universe. This research, which participates the Millennium Institute of Astrophysics (MAS) astronomer Lorena Hern\u00e1ndez, was highlighted by the Monthly Notices of the Royal Astronomical Society.<\/em><\/strong><\/p>\n<\/div>\n\n\n\n

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Lorena Hern\u00e1ndez<\/p>\n<\/div>\n<\/div>\n\n\n\n

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No tiene un nombre muy atractivo y para nada especial, pero sin duda la galaxia PBC J2333.9-2343 tiene caracter\u00edsticas especiales que nos permiten entender mejor c\u00f3mo funcionan las din\u00e1micas dentro de estos importantes objetos estelares. Particularidades que han hecho que sea el objeto de estudio por a\u00f1os de la astr\u00f3noma Lorena Hern\u00e1ndez, investigadora del Instituto Milenio de Astrof\u00edsica MAS en Chile y de su colega Francesca Panessa, del Istituto di Astrofisica e Planetologia Spaziali (IAPS-INAF) de Italia.<\/p>\n

\u201cEmpezamos a estudiar esta galaxia porque mostraba propiedades peculiares en diferentes frecuencias o energ\u00edas. Nuestra hip\u00f3tesis era que el chorro relativista de su agujero negro hab\u00eda cambiado de direcci\u00f3n, pero para corroborar esa idea, deb\u00edamos realizar diferentes observaciones. Propusimos un programa de seguimiento en diferentes rangos de energ\u00eda de esta galaxia, ya que los cambios que podemos observar en ella nos dan informaci\u00f3n sobre la naturaleza de las regiones que la emiten, y nos permiten entender con mejor detalle los procesos f\u00edsicos que tienen lugar\u201d, explica Lorena, quien es parte del br\u00f3ker astron\u00f3mico ALeRCE  (Automatic learning for the rapid classification of event<\/i>).<\/p>\n

This work, published in the renowned Monthly Notices of the Royal Astronomical Society, <\/i>descubrieron que lo que se produjo en PBC J2333.9-2343 fue que el chorro de part\u00edculas originado en las proximidades de su agujero supermasivo, conocido como jet y que se observa como una estructura c\u00f3nica lanzada a gran distancia por los agujeros negros, al ser acelerado a velocidades relativistas cambi\u00f3 su direcci\u00f3n de forma dr\u00e1stica, pasando de estar en el plano del cielo, a estar alineado a nuestra l\u00ednea visi\u00f3n, apuntando hacia nosotros, lo que es primera vez que se observa. \u201cUn jet est\u00e1 compuesto por part\u00edculas elementales como electrones y protones que se mueven a velocidades cercanas a la de la luz. Estas part\u00edculas se mueven de forma circular alrededor de un fuerte campo magn\u00e9tico, provocando la emisi\u00f3n de radiaci\u00f3n a trav\u00e9s de todo el espectro electromagn\u00e9tico. Cuando apunta en nuestra direcci\u00f3n, la emisi\u00f3n del \u00e9ste es fuertemente amplificada, pudiendo f\u00e1cilmente superar la del resto de la galaxia, lo que puede derivar en un comportamiento con \u201cflares\u201d o llamaradas de gran intensidad. Eso cambia la categorizaci\u00f3n de esa galaxia\u201d, explica.<\/p>\n

According to Hern\u00e1ndez, when two jets point towards the plane of the sky, it is known as a radio galaxy, whereas one of the jets points towards us, like the PBC J2333.9-2343, the active galactic nucleus of the galaxy is called a blazar. This astronomical phenomenon is one of the strongest, largest energy sources studied in the Universe.<\/p>\n

Y aunque cambios en la direcci\u00f3n de los jets, se han descrito anteriormente, como en el caso de las radio galaxias en forma de X, esta es la primera vez que se observa esta morfolog\u00eda, la que no nos da pistas respecto a jets o chorros en diferentes direcciones. \u201cEllo no significa que no existan otros casos, pero son dif\u00edciles de identificar. Ahora que conocemos lo que sucedi\u00f3 en  PBC J2333.9-2343, es m\u00e1s f\u00e1cil pensar en formas de buscar otros similares. Lo que podemos decir de este caso particular es que se trata de una galaxia que se sale de la norma de lo que conocemos, ya que su n\u00facleo activo no encaja en los conceptos generales que hemos descubierto. Estudiar este tipo de galaxias que no siguen las reglas comunes nos puede dar mucha informaci\u00f3n sobre c\u00f3mo evolucionan, nos puede abrir la mente a nuevos descubrimientos sobre lo que ocurre en lo m\u00e1s profundo de las galaxias\u201d.<\/p>\n

<\/p>\n

Observing at different frequencies<\/b><\/h4>\n

The program that astronomers used in order to get these conclusions were based on data obtained with the German 100m-Radio Telescope Effelsberg at the Max Planck Institute for Radio Astronomy (radio frequency), the Yale University 1,3m-SMARTS instrument (optical and infrared photometry), and data from the Penn State Neil Gehrels Swift Observatory (X-ray and ultraviolet). Complementing the study, the scientists compared variation properties in PBC J2333.9-2343 with large samples of blazars and non-blazars galaxies provided by the ALeRCE project in Chile with data from the Zwicky Transient Facility (ZTF) observations <\/i>(ZTF) and the Asteroid Terrestrial-impact Last Alert System (ATLAS).<\/i>\u201cWe could study the changes that the galaxy experiences in time with the monitoring data, and we saw the variations in the energies we observed, from the radio frequencies to the gamma rays,\u201d Lorena Hern\u00e1ndez states.<\/p>\n

In addition to this, public data were included, obtained from other instruments: \u201cAlthough they are not for variability studies, they are used for other purposes. \u201dThese data are from Fermi Large Area Telescope<\/i> (gamma rays), the Very Long Baseline Array <\/i>(radiofrequency at 15 and 24 GHz), Very Large Array Sky Survey<\/i> (at 3GHz), and the the Very Large Array Sky Survey<\/i> (0,88 GHz).<\/p>\n

With this information, experts concluded that this galaxy has a bright AGN in the centre, with two lobes in the outer areas of the jet. \u201cWhat is interesting about these galaxies is that the amount of time in which matter could move from the nucleus to the lobes is so long that it could be approximately a hundred million years. During this time, many things may have occurred in the galaxy, like nuclear activity could cease and reactivate after a while or a merging event with another galaxy or any other relatively large object to change the jet direction. We don\u2019t know what happened in this case because it was long ago; however, we can be sure that some powerful event occurred,\u201d says Hern\u00e1ndez.<\/p>\n

The conclusions drawn from this research include, for example, the observation that the lobes are not being fueled by the core, 'indicating once again that the core is now feeding this blazar.' Additionally, it is noted, 'the fact that we see the emission from the lobes no longer being fed from the core suggests that it is very old emission that has not yet extinguished; in other words, it is the relic of past activity, while structures closer to the core represent younger and more active jets.'\n\n\"The most challenging aspect of this research was demonstrating that the current jet, appearing as a bright point, is indeed directed straight towards us. This was proven in two ways: by comparing what we know about the brightness variability of jets from other similar galaxies (such as how much they vary on different time scales and the delay between variations in one color of light and another) and by using theoretical models to determine how much light a jet seen under these conditions emits across the entire observable electromagnetic spectrum, from radio waves to gamma rays,\" states Patricia Ar\u00e9valo, a researcher at the Institute of Physics and Astronomy at the University of Valpara\u00edso, who was also part of the study.<\/p>\n

In this research participated MAS astronomers Francisco F\u00f6rster, Franz Bauer, Alejandra Mu\u00f1oz and Paula S\u00e1nchez, and a collaboration with researchers from Chile, Italy, Mexico, Switzerland, and Germany. <\/p>\n

The MAS astronomers Francisco F\u00f6rster, Franz Bauer, Alejandra Mu\u00f1oz, and Paula S\u00e1nchez, along with IFA's Lorena Hernandez, Patricia Ar\u00e9valo, and Rosamaria Carraro, and from the University of Chile, Paulina Lira, all played a crucial role in this research. This collaborative effort also involved researchers from Italy, Mexico, Switzerland, and Germany <\/p>\n

Link to Publication <\/a><\/p>\n

Photo CREDIT: NASA\/JPL-Caltech<\/em><\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Thanks to collaborative work with the SYSTEM Sound project work team, national scientists used their computational simulations from the protoplanetary disks of HD 163296 star to give them sound that creates a beautiful melody and brings the understanding of this object closer to people.<\/p>","protected":false},"author":1,"featured_media":25787,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_eb_attr":"","footnotes":""},"categories":[23],"tags":[],"class_list":["post-25741","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticias"],"yoast_head":"\nAstr\u00f3nomas descubren la primera galaxia que ha cambiado su clasificaci\u00f3n debido a inusual actividad en el n\u00facleo activo de su agujero negro - Instituto Milenio de Astrof\u00edsica MAS<\/title>\n<meta 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