Results 21 to 30 of about 101,515 (208)

On the Origin of Radio-loudness in Active Galactic Nuclei Using Far-infrared Polarimetric Observations

The Astrophysical Journal, 2023
The dichotomy between radio-loud (RL) and radio-quiet (RQ) active galactic nuclei (AGNs) is thought to be intrinsically related to radio jet production. This difference may be explained by the presence of a strong magnetic field ( B -field) that enhances,
Enrique Lopez-Rodriguez, Makoto Kishimoto, Robert Antonucci, Mitchell C. Begelman, Noemie Globus, Roger Blandford   +5 more
doaj   +1 more source

The Structure of Magnetic Fields in Spiral Galaxies: A Radio and Far-infrared Polarimetric Analysis

The Astrophysical Journal, 2023
We propose and apply a method to quantify the morphology of the large-scale ordered magnetic fields ( B -fields) in galaxies. This method is adapted from the analysis of Event Horizon Telescope polarization data.
William Jeffrey Surgent, Enrique Lopez-Rodriguez, Susan E. Clark   +2 more
doaj   +1 more source

Surveying the Giant H ii Regions of the Milky Way with SOFIA: V. DR7 and K3-50

The Astrophysical Journal, 2023
We present our fifth set of results from our mid-infrared imaging survey of Milky Way Giant H ii (GH ii ) regions with our detailed analysis of DR7 and K3-50.
James M. De Buizer, Wanggi Lim, James T. Radomski, Mengyao Liu   +3 more
doaj   +1 more source

Launching the VASCO Citizen Science Project

Universe, 2022
The Vanishing & Appearing Sources during a Century of Observations (VASCO) project investigates astronomical surveys spanning a time interval of 70 years, searching for unusual and exotic transients.
Beatriz Villarroel, Kristiaan Pelckmans, Enrique Solano, Mikael Laaksoharju, Abel Souza, Onyeuwaoma Nnaemeka Dom, Khaoula Laggoune, Jamal Mimouni, Hichem Guergouri, Lars Mattsson, Aurora Lago García, Johan Soodla, Diego Castillo, Matthew E. Shultz, Rubby Aworka, Sébastien Comerón, Stefan Geier, Geoffrey W. Marcy, Alok C. Gupta, Josefine Bergstedt, Rudolf E. Bär, Bart Buelens, Emilio Enriquez, Christopher K. Mellon, Almudena Prieto, Dismas Simiyu Wamalwa, Rafael S. de Souza, Martin J. Ward   +27 more
doaj   +1 more source

Infrared spectroscopic diagnostics for Active Galactic Nuclei

, 2007
Infrared spectroscopy in the mid- and far-infrared provides powerful diagnostics for studying the emission regions in active galaxies. The large variety of ionic fine structure lines can probe gas conditions in a variety of physical conditions, from ...
Spinoglio, Luigi
core   +1 more source

How Accurately Can Obscured Galaxy Luminosities Be Measured Using Spectral Energy Distribution Fitting of Near- through Far-infrared Observations?

The Astrophysical Journal
Infrared-luminous galaxies are important sites of stellar and black hole mass assembly at most redshifts. Their luminosities are often estimated by fitting spectral energy distribution (SED) models to near- to far-infrared data, but the dependence of ...
Duncan Farrah, Kiana Ejercito, Andreas Efstathiou, David Leisawitz, Athena Engholm, Irene Shivaei, Matteo Bonato, David L. Clements, Sara Petty, Lura. K. Pitchford, Charalambia Varnava, Jose Afonso, Carlotta Gruppioni, Evanthia Hatziminaoglou, Andrew Hoffman, Mark Lacy, Brenda C. Matthews, Conor Nixon, Chris Pearson, Berke Vow Ricketti, Dimitra Rigopoulou, Loren Robinson, Locke D. Spencer, Lingyu Wang, David B. Sanders, Gerard van Belle   +25 more
doaj   +1 more source

Two bolometer arrays for far-infrared and submillimeter astronomy [PDF]

SPIE Proceedings, 2004
We describe the development, construction, and testing of two 384 element arrays of ion-implanted semiconducting cryogenic bolometers designed for use in far-infrared and submillimeter cameras. These two dimensional arrays are assembled from a number of 32 element linear arrays of monolithic Pop-Up bolometer Detectors (PUD) developed at NASA/Goddard ...
Silverberg, R. F., Allen, C. A., Babu, S. R., Benford, D. J., Chuss, D. T., Dotson, J. L., Dowell, C. D., Harper, D. A., Jhabvala, M. D., Loewenstein, R. F., Moseley, S. H., Staguhn, J. G., Voellmer, G., Wollack, E. J.   +13 more
openaire   +2 more sources

Extragalactic Results from the Infrared Space Observatory

, 2000
More than a decade ago the IRAS satellite opened the realm of external galaxies for studies in the 10 to 100 micron band and discovered emission from tens of thousands of normal and active galaxies.
Acosta-Pulido JA, Afonso C, Alexander T, Altieri B, Alton PB, Aussel H, Aussel H, Awaki H, Binette L, Boller T, Boselli A, Boselli A, Boulade O, Braine J, Catherine J. Cesarsky, Cesarsky CJ, Cesarsky D, Cesarsky D, Chapman SC, Clavel J, Clegg PE, Clements DL, Contursi A, de Graauw T, Desert FX, Desert FX, Doherty RM, Duley WW, Efstathiou A, Elbaz D, Fadda D, Fischer J, Flores H, Franceschini A, Gilmore G, Haas M, Haas M, Haas M, Hippelein H, Kawara K, Kegel WH, Kessler MF, Knapp GR, Krügel E, Kunze D, Lagache G, Lagache G, Lagache G, Lai O, Laureijs RJ, Laurent O, Laurent O, Lemke D, Lemonon L, Lord SD, Lutz D, Lutz D, Lutz D, Lutz D, Mattila K, Mattila K, Metcalfe L, Mirabel IF, Mirabel IF, Moorwood AFM, Moorwood AFM, Najarro F, Nakagawa T, Oliva E, Pagani L, Pfenniger D, Puget JL, Puget JL, Radovich M, Reinhard Genzel, Rigopoulou D, Rigopoulou D, Rigopoulou D, Rodriguez Espinosa JM, Rouan D, Roussel H, Rowan-Robinson M, Schaerer D, Scott D, Scoville NZ, Serjeant S, Siebenmorgen R, Stickel M, Sturm E, Sturm E, Taniguchi Y, Taniguchi Y, Tecza M, Thornley MD, Tran DQ, Tuffs RJ, Unger SJ, Valentijn EA, Verstraete L, Viegas SM, Vignati P, Vigroux L, Walter R, Wilkes BJ   +103 more
core   +1 more source

The Radio-FIR correlation: Is MHD Turbulence the Cause? [PDF]

, 2003
The radio - far infrared correlation is one of the tightest correlations found in astronomy. Many of the models explaining this correlation rely on the association of of global magnetic field strength with gas density.
Alex Lazarian, Beck, Berkhuijsen, Brent A. Groves, Cattaneo, Combes, de Jong, Ekers, Gruzinov, Hoernes, Jungyeon Cho, Kim, Lisenfeld, Michael Dopita, Moffatt, Niklas, Niklas, Parker, Shostak, van der Kruit, van der Kruit, Völk, Völk, Wunderlich, Wunderlich, Xu, Xu   +26 more
core   +1 more source

A Simple Model of the Radio–Infrared Correlation Depending on Gas Surface Density and Redshift

The Astrophysical Journal
We introduce a simple parametric model of the radio–infrared correlation (i.e., the ratio between the IR luminosity and the 1.4 GHz radio luminosity, q _IR ) by considering the energy loss rate of high-energy cosmic-ray (CR) electrons governed by ...
Ilsang Yoon
doaj   +1 more source