Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Järvelä, Emilia"'
Autor:
Foschini, Luigi, Barba, Benedetta Dalla, Tornikoski, Merja, Andernach, Heinz, Marziani, Paola, Marscher, Alan P., Jorstad, Svetlana G., Järvelä, Emilia, Antón, Sonia, Bontà, Elena Dalla
We present the results of a comparison between different methods to estimate the power of relativistic jets from active galactic nuclei (AGN). We selected a sample of 32 objects (21 flat-spectrum radio quasars, 7 BL Lacertae Objects, 2 misaligned AGN
Externí odkaz:
http://arxiv.org/abs/2403.17581
Autor:
Foschini, Luigi, Lister, Matthew L., Andernach, Heinz, Ciroi, Stefano, Marziani, Paola, Antón, Sonia, Berton, Marco, Bontà, Elena Dalla, Järvelä, Emilia, Marchã, Maria J. M., Romano, Patrizia, Tornikoski, Merja, Vercellone, Stefano, Vietri, Amelia
Publikováno v:
Universe 2022, 8(11), 587
We considered the fourth catalog of gamma-ray point sources produced by the Fermi Large Area Telescope (LAT) and selected only jetted active galactic nuclei (AGN) or sources with no specific classification, but with a low-frequency counterpart. Our f
Externí odkaz:
http://arxiv.org/abs/2211.03400
Autor:
Varglund, Irene, Järvelä, Emilia, Lähteenmäki, Anne, Berton, Marco, Ciroi, Stefano, Congiu, Enrico
Narrow-line Seyfert 1 (NLS1) galaxies are unevolved active galactic nuclei (AGN) that exist predominantly in spiral galaxies. However, mostly due to the small number of sources studied, it has been under debate whether also the hosts of jetted NLS1 g
Externí odkaz:
http://arxiv.org/abs/2209.09270
Autor:
Chen, Sina, Stevens, Jamie B., Edwards, Philip G., Laor, Ari, Gu, Minfeng, Berton, Marco, Järvelä, Emilia, Kharb, Preeti, Behar, Ehud, Su, Renzhi
We present radio spectral analyses for a sample of 29 radio-quiet (RQ) and three radio-loud (RL) narrow-line Seyfert 1 galaxies (NLS1s) detected with the Australia Telescope Compact Array at both 5.5 GHz and 9.0 GHz. The sample is characterized by L_
Externí odkaz:
http://arxiv.org/abs/2202.11065
Autor:
Kim, Sang-Hyun, Lee, Sang-Sung, Lee, Jee Won, Hodgson, Jeffrey A., Kang, Sincheol, Algaba, Juan-Carlos, Kim, Jae-Young, Hodges, Mark, Agudo, Ivan, Fuentes, Antonio, Escudero, Juan, Myserlis, Ioannis, Traianou, Efthalia, Lähteenmäki, Anne, Tornikoski, Merja, Tammi, Joni, Ramakrishnan, Venkatessh, Järvelä, Emilia
CTA 102 is a blazar implying that its relativistic jet points towards Earth and emits synchrotron radiation produced by energetic particles gyrating in the magnetic field. This study aims to figure out the physical origins of radio flares in the jet,
Externí odkaz:
http://arxiv.org/abs/2111.14025
Autor:
Berton, Marco, Järvelä, Emilia
The first similarities between peaked sources (PS) and narrow-line Seyfert 1 (NLS1) galaxies were noticed already twenty years ago. Nowadays, it is known that several sources can share both classifications, and that part of the parent population of $
Externí odkaz:
http://arxiv.org/abs/2110.02973
Autor:
Järvelä, Emilia, Dahale, Rohan, Crepaldi, Luca, Berton, Marco, Congiu, Enrico, Antonucci, Robert
Publikováno v:
A&A 658, A12 (2022)
Narrow-line Seyfert 1 (NLS1) galaxies are believed to be active galactic nuclei (AGN) in the early stages of their evolution. Some dozens of them have been found to host relativistic jets, whilst the majority has not even been detected in radio, emph
Externí odkaz:
http://arxiv.org/abs/2109.07841
Narrow-line Seyfert 1 (NLS1) galaxies are active galactic nuclei (AGN) believed to be in the early stages of their evolution. A fraction of them have been found to host relativistic jets. Due to the lack of large-scale diffuse radio emission they are
Externí odkaz:
http://arxiv.org/abs/2108.08521
Autor:
Berton, Marco, Järvelä, Emilia
It is well known that active galactic nuclei (AGN) show various forms of interaction with their host galaxy, in a number of phenomena generally called AGN feedback. In particular, the relativistic plasma jets launched by a fraction of AGN can strongl
Externí odkaz:
http://arxiv.org/abs/2106.01076
Autor:
Hamilton, Timothy S., Berton, Marco, Antón, Sonia, Busoni, Lorenzo, Caccianiga, Alessandro, Ciroi, Stefano, Gässler, Wolfgang, Georgiev, Iskren, Järvelä, Emilia, Komossa, S., Mathur, Smita, Rabien, Sebastian
The gamma-ray emitting galaxy SBS 0846+513 has been classified as a Narrow-Line Seyfert 1 from its spectroscopy, and on that basis it was thought likely to have a small central black hole hosted in a spiral galaxy. But very few of the gamma-ray Narro
Externí odkaz:
http://arxiv.org/abs/2011.07413