4 results on '"Miguel Pereira"'
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2. The ESO's Extremely Large Telescope Working Groups
- Author
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Padovani, Paolo, Cirasuolo, Michele, van der Burg, Remco, Cantalloube, Faustine, George, Elizabeth, Kasper, Markus, Leschinski, Kieran, Martins, Carlos, Milli, Julien, Möhler, Sabine, Neeser, Mark, Neichel, Benoit, Otarola, Angel, Sánchez-Janssen, Rubén, Serra, Benoit, Smette, Alain, Valenti, Elena, Verinaud, Christophe, Vernet, Joël, Absil, Olivier, Agapito, Guido, Andersen, Morten, Arcidiacono, Carmelo, Arko, Matej, Baudoz, Pierre, Beltramo-Martin, Olivier, Biancalani, Enrico, Bierwirth, Thomas, Burtscher, Leonard, Carlà, Giulia, Castro-Almazán, Julio A., Cheffot, Anne-Laure, Coccato, Lodovico, Correia, Carlos, Fetick, Romain, Fiorentino, Giuliana, Fusco, Thierry, García-Lorenzo, Begoña, Fusillo, Nicola Gentile, Gonzalez, Oscar, Grazian, Andrea, Gullieuszik, Marco, Hainaut, Olivier, Ivanov, Valentin, Kaasinen, Melanie, Kaddad, Darshan, Kamiński, Tomasz, Kausch, Wolfgang, Kerber, Florian, Kimeswenger, Stefan, Kokotanekova, Rosita, Kuznetsov, Arseniy, Lau, Alexis, Louarn, Miska Le, Lemmel, Frédéric, Liske, Jochen, Curto, Gaspare Lo, Lucsanyi, David, Lundin, Lars, Noll, Stefan, Oberti, Sylvain, Osborn, James, Masciadri, Elena, Milaković, Dinko, Murphy, Michael T., Pedichini, Fernando, Santaella, Miguel Pereira, Piazzesi, Roberto, López, Javier Piqueras, Plantet, Cédric, Prod'homme, Thibaut, Przybilla, Norbert, Puech, Mathieu, Reid, Derryck T., Reiners, Ansgar, Rijnenberg, Rutger, Rodrigues, Myriam, Rossi, Fabio, Routledge, Laurence, Smit, Hans, Tecza, Mathias, Thatte, Niranjan, van Boekel, Roy, Verma, Aprajita, and Vigan, Arthur
- Subjects
Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
Since 2005 ESO has been working with its community and industry to develop an extremely large optical/infrared telescope. ESO's Extremely Large Telescope, or ELT for short, is a revolutionary ground-based telescope that will have a 39-metre main mirror and will be the largest visible and infrared light telescope in the world. To address specific topics that are needed for the science operations and calibrations of the telescope, thirteen specific working groups were created to coordinate the effort between ESO, the instrument consortia, and the wider community. We describe here the goals of these working groups as well as their achievements so far., Comment: 8 pages, 4 figures
- Published
- 2023
- Full Text
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3. The relativistic jet of the gamma-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
- Author
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Kynoch, Daniel, Landt, Hermine, Ward, Martin J., Done, Chris, Gardner, Emma, Boisson, Catherine, Arrieta-Lobo, Maialen, Zech, Andreas, Steenbrugge, Katrien, and Santaella, Miguel Pereira
- Subjects
Astrophysics - Astrophysics of Galaxies ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
The detection of several radio-loud narrow-line Seyfert 1 (NLS1) galaxies by the Fermi Gamma-Ray Space Telescope hints at the existence of a rare, new class of gamma-ray emitting active galactic nuclei with low black hole masses. Like flat spectrum radio quasars (FSRQs), their gamma-ray emission is thought to be produced via the external Compton mechanism whereby relativistic jet electrons upscatter a photon field external to the jet, e.g. from the accretion disc, broad line region (BLR) and dusty torus, to higher energies. Here we study the origin of the gamma-ray emission in the lowest-redshift candidate among the currently-known gamma-ray emitting NLS1s, 1H 0323+342, and take a new approach. We observationally constrain the external photon field using quasi-simultaneous near-IR, optical and X-ray spectroscopy. Applying a one-zone leptonic jet model, we simulate the range of jet parameters for which this photon field, when Compton scattered to higher energies, can explain the gamma-ray emission. We find that the site of the gamma-ray emission lies well within the BLR and that the seed photons mainly originate from the accretion disc. The jet power that we determine, $1.0 \times 10^{45}$ erg s$^{-1}$, is approximately half the accretion disc luminosity. We show that this object is not simply a low-mass FSRQ, its jet is intrinsically less powerful than predicted by scaling a typical FSRQ jet by black hole mass and accretion rate. That gamma-ray emitting NLS1s appear to host underpowered jets may go some way to explaining why so few have been detected to date., Comment: 22 pages, 8 figures and 8 tables. Accepted for publication in MNRAS
- Published
- 2017
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4. First Extragalactic Detection of Far-Infrared CH Rotational Lines from the Herschel Space Observatory
- Author
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Rangwala, Naseem, Maloney, Philip R., Glenn, Jason, Wilson, Christine D., Kamenetzky, Julia, Schirm, Maximilien R. P., Spinoglio, Luigi, and Santaella, Miguel Pereira
- Subjects
Astrophysics - Astrophysics of Galaxies - Abstract
We present the first extragalactic detections of several CH rotational transitions in the far-infrared (FIR) in four nearby galaxies: NGC 1068, Arp 220, M 82 and NGC 253 using the \textit{Herschel Space Observatory}. The CH lines in all four galaxies are a factor of 2 - 4 brighter than the adjacent HCN and HCO+ J = 6-5 lines (also detected in the same spectra). In the star formation dominated galaxies, M 82, NGC 253 and Arp 220, the CH/CO abundance ratio is low (1e-5), implying that the CH is primarily arising in diffuse and translucent gas where the chemistry is driven by UV radiation as found in the Milky Way ISM. In NGC 1068, which has a luminous AGN, the CH/CO ratio is an order of magnitude higher suggesting that CH formation is driven by an X-ray dominated region. Our XDR models show that both the CH and CO abundances in NGC 1068 can be explained by an XDR-driven chemistry for gas densities and molecular hydrogen column densities that are well constrained by the CO observations. We conclude that the CH/CO ratio may a good indicator of the presence of AGN in galaxies. We also discuss the feasibility of detecting CH in intermediate- to high-z galaxies with ALMA., Comment: Accepted for Publication in ApJ
- Published
- 2014
- Full Text
- View/download PDF
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