Results 21 to 30 of about 141,201 (236)

A mid-infrared exploration of the dusty environments of active galactic nuclei

, 2013
We present the first results from a mid-infrared survey of local Active Galactic Nuclei (AGN) using the CanariCam (CC) instrument on the 10.4m Gran Telescopio Canarias (GTC).
Alonso-Herrero, Almudena
core   +1 more source

Black hole variability and the star formation-active galactic nucleus connection : do all star-forming galaxies host an active galactic nucleus? [PDF]

, 2014
We investigate the effect of active galactic nucleus (AGN) variability on the observed connection between star formation and black hole accretion in extragalactic surveys.
Alexander, D.M., Chen, C.-T.J., Civano, F.M., Goulding, A.D., Hainline, K.N., Hickox, R.C., Mullaney, J.R.   +6 more
core   +2 more sources

The Connection between 3.3 {\mu}m PAH Emission and AGN Activity

, 2012
We investigate the connection between starburst and AGN activity by comparing the 3.3 {\mu}m PAH eimission with AGN properties. Utilizing the slit-less spectroscopic capability of the AKARI space telescope, we observe moderate-luminosity Type I AGN at z ...
Ballantyne, Bennert, Bennert, Bentz, Bentz, Ciotti, Clavel, Dawoo Park, Ferrarese, Galliano, Gebhardt, Greene, Gültekin, Ho, Hopkins, Hopkins, Imanishi, Imanishi, Imanishi, Imanishi, Imanishi, Ji Hoon Kim, Jong-Hak Woo, Kawakatu, Laurent, Lutz, Lutz, Masatoshi Imanishi, Merloni, Netzer, Ogle, Ohyama, Oi, Onaka, Park, Peterson, Robertson, Ryan, Sales, Schweitzer, Shang, Shi, Shi, Smith, Szathmary, Treu, Watabe, Woo, Woo, Woo, Woo   +50 more
core   +1 more source

AGN host galaxies [PDF]

New Astronomy Reviews, 2008
A series of four lectures presented at the 2007 summer school on "Active Galactic Nuclei at the highest angular resolution: theory and observations" held in Torun, Poland.
openaire   +2 more sources

Typical AGN at intermediate redshifts

, 2008
We study the host galaxies and black holes of typical X-ray selected AGN at intermediate redshifts (z~0.5-1.4). The AGN are selected such that their spectral energy distributions are dominated by stellar emission, i.e., they show a prominent 1.6micron ...
Almudena Alonso-Herrero, Archan S. Majumdar, Sandip K. Chakrabarti   +2 more
core   +1 more source

Active Galactic Nuclei Feedback in SDSS-IV MaNGA: AGNs Have Suppressed Central Star Formation Rates

The Astrophysical Journal, 2023
Despite the importance of feedback from active galactic nuclei (AGNs) in models of galaxy evolution, observational constraints on the influence of AGN feedback on star formation remain weak.
Caleb Lammers, Kartheik G. Iyer, Hector Ibarra-Medel, Camilla Pacifici, Sebastián F. Sánchez, Sandro Tacchella, Joanna Woo   +6 more
doaj   +1 more source

Frying Doughnuts: What can the reprocessing of X-rays to IR tell us about the AGN environment?

, 2008
Active galactic nuclei (AGN) produce vast amounts of high energy radiation deep in their central engines. X-rays either escape the AGN or are absorbed and re-emitted mostly as IR.
Antonucci, B. McKernan, Bian, Boller, Bonatto, Boroson, Botte, Buchanan, C. S. Reynolds, Efstathiou, Efstathiou, Eracleous, Foschini, Gonzalez Delgado, Green, Grupe, Ho, Horst, Itoh, K. E. S. Ford, Krabbe, Kraft, Kukula, Leighly, Lutz, Malizia, Markowitz, Mas-Hesse, Matt, McKernan, McKernan, Miller, Miniutti, Miyaji, Mushotzky, N. Chang, Nagar, Perola, Peterson, Pier, Polletta, Porquet, Revnivtsev, Risaliti, Rush, Sanders, Schade, Shinozaki, Sirocky, Smith, Spergel, Tajer, Treister, Tueller, Turner, Veilleux, Voges, Winter   +57 more
core   +1 more source

Fading AGN Candidates: AGN Histories and Outflow Signatures^∗

The Astrophysical Journal, 2017
Abstract We consider the energy budgets and radiative history of eight fading active galactic nuclei (AGNs), identified from an energy shortfall between the requirements to ionize very extended (radius > 10 kpc) ionized clouds and the luminosity of the nucleus as we view it directly.
Keel, WC, Lintott, CJ, Maksym, WP, Bennert, VN, Chojnowski, SD, Moiseev, A, Smirnova, A, Schawinski, K, Sartori, LF, Urry, CM, Pancoast, A, Schirmer, M, Scott, B, Showley, C, Flatland, K   +14 more
openaire   +5 more sources

Does the obscured AGN fraction really depend on luminosity? [PDF]

, 2015
We use a sample of 151 local non-blazar AGN selected from the INTEGRAL all-sky hard X-ray survey to investigate if the observed declining trend of the fraction of obscured (i.e.
Churazov, Eugene, Krivonos, Roman, Sazonov, Sergey   +2 more
core   +2 more sources

Galactic bars and active galactic nucleus fuelling in the second half of cosmic history

Astronomy & Astrophysics
We investigate the role of galactic bars in fuelling and triggering active galactic nuclei (AGN) in disc galaxies up to z ∼ 0.8. We utilised a deep learning model, fine-tuned on Galaxy Zoo volunteer classifications, to identify (strongly and weakly ...
La Marca A., Nardone M. T., Wang L., Margalef-Bentabol B., Kruk S., Trager S. C.   +5 more
doaj   +1 more source