Results 111 to 120 of about 238,671 (290)

Discovery of Active Galactic Nuclei in Mid- and Far-Infrared Deep Surveys with ISO [PDF]

arXiv, 2001
We present a summary on the discovery of active galactic nuclei in mid- and far-infrared deep surveys with use of the Infrared Space Observatory.
arxiv  

The role of the central stellar cluster in active galactic nuclei. I. Semi-analytical model [PDF]

, 2002
The subject of the paper is the role of the massive stellar cluster in the activity phenomenon and in the structure of active galactic nuclei. We introduce a simple model of stellar dynamics in the internal part of the cluster, which allows us to include both the star-disk and the star-star interactions.
arxiv   +1 more source

Aerosol Measurements and Decadal Changes: The Role of Climatic Changes and How It Reflects in Respiratory Allergies and Asthma

Allergy, EarlyView.
ABSTRACT The causative agents of respiratory allergies are bioaerosols, such as house dust mite feces, pollen grains, and fungal spores. Climate change and urbanization are considered to lead to an increase in the load of allergenic bioaerosols due to impacts on plant phenophases and allergenicity. Continuous and efficient monitoring of the atmospheric
Stelios Kazadzis, Illias Fountoulakis, Athanasios Damialis, Akriti Masoom, Kyriakoula Papachristopoulou, Stefanie Gilles, Martine Collaud Coen, Fiona Tummon, Benoît Crouzy, Bernard Clot, Yagiz Pat, Marie‐Charlotte Brüggen, Stephan Nyeki, Ioannis‐Panagiotis Raptis, Stavros Solomos, Antonis Gkikas, Anna Moustaka, Natalia Kouremeti, Cezmi A. Akdis   +18 more
wiley   +1 more source

Naked active galactic nuclei [PDF]

Astronomy & Astrophysics, 2004
17 pages including 11 figures.
openaire   +4 more sources

Gas flows in galactic nuclei: observational constraints on BH-galaxy coevolution [PDF]

, 2016
Galaxy nuclei are a unique laboratory to study gas flows. High-resolution imaging of the gas flows in galactic nuclei are instrumental in the study of the fueling and the feedback of star formation and nuclear activity in nearby galaxies. Several fueling mechanisms can be now confronted in detail with observations done with state-of-the-art ...
arxiv   +1 more source

Deformation mechanism of CeO2 nanocubes studied at room temperature using in situ nanocompression in environmental transmission electron microscopy

Journal of the American Ceramic Society, EarlyView.
Deformation mechanism of CeO2 nanocubes and their size dependence of the elastic strain. Abstract The deformation mechanism of CeO2 nanocubes has been studied at room temperature using in situ nanocompression experiments in an environmental transmission electron microscope. Different imaging conditions were used to identify the slip systems.
Rongrong Zhang, Lucile Joly‐Pottuz, Frédéric Chaput, David J. Dunstan, Karine Masenelli‐Varlot   +4 more
wiley   +1 more source

PEARLS: Discovery of Point-source Features within Galaxies in the North Ecliptic Pole Time Domain Field

The Astrophysical Journal
The first public 0.9–4.4 μ m NIRCam images of the North Ecliptic Pole Time Domain Field uncovered galaxies displaying point-source features in their cores as seen in the longer-wavelength filters. We visually identified a sample of 66 galaxies (∼1 galaxy
Rafael Ortiz III, Rogier A. Windhorst, Seth H. Cohen, Steven P. Willner, Rolf A. Jansen, Timothy Carleton, Patrick S. Kamieneski, Michael J. Rutkowski, Brent M. Smith, Jake Summers, Cheng Cheng, Dan Coe, Christopher J. Conselice, Jose M. Diego, Simon P. Driver, Jordan C. J. D’Silva, Brenda L. Frye, Hansung B. Gim, Norman A. Grogin, Heidi B. Hammel, Nimish P. Hathi, Benne W. Holwerda, Minhee Hyun, Myungshin Im, William C. Keel, Anton M. Koekemoer, Juno Li, Madeline A. Marshall, Tyler J. McCabe, Noah J. McLeod, Stefanie N. Milam, Rosalia O’Brien, Nor Pirzkal, Aaron S. G. Robotham, Russell E. Ryan Jr., Christopher N. A. Willmer, Haojing Yan, Min S. Yun, Adi Zitrin   +38 more
doaj   +1 more source

VIS‐to‐MIR reflectance and Raman spectroscopy of the CM2 NWA 12184 carbonaceous chondrite

Meteoritics &Planetary Science, Volume 60, Issue 3, Page 570-595, March 2025.
Abstract The spectral analysis of CM meteorites can help to constrain the mineralogical composition of their parent body, the C‐type asteroids. The CM2 NWA 12184 was spectrally examined employing seven complementary techniques at different spatial resolutions, including VIS‐to‐MIR reflectance and Raman spectroscopy.
A. Galiano, F. Dirri, M. Ferrari, C. Carli, E. Bruschini, G. Filacchione, G. Piccioni, E. Palomba, S. Stefani, A. Raponi, M. Ciarniello, M. E. Palumbo, C. Scirè Scappuzzo, G. Baratta, R. G. Urso, L. Inno   +15 more
wiley   +1 more source

Mid-infrared Variability in Nearby Galaxies from the MaNGA Sample

The Astrophysical Journal
We use mid-infrared variability in galaxies to search for active galactic nuclei (AGN) in the local universe. We use a sample of 10,220 galaxies from the Mapping Nearby Galaxies at Apache Point Observatory survey, part of the Sloan Digital Sky Survey ...
Aashay Pai, Michael R. Blanton, John Moustakas   +2 more
doaj   +1 more source

Black Holes in Galactic Nuclei: the Promise and the Facts [PDF]

arXiv, 2002
It has long been suspected that Active Galactic Nuclei are powered by accretion of matter onto massive black holes and this belief implies their presence in the nuclei of most nearby galaxies as "relics" of past activity. Just a few years ago this was considered a paradigm but, recently, new ground-based and Hubble Space Telescope observations are ...
arxiv