Results 11 to 20 of about 4,398,607 (320)

Do quiescent and active galaxies have different M_BH-sigma relations? [PDF]

, 2013
To investigate the validity of the assumption that quiescent galaxies and active galaxies follow the same black hole mass - stellar velocity dispersion relation, as required for the calibration of M_BH estimators for broad line AGNs, we determine and compare the M-sigma relations, respectively, for quiescent and active galaxies.
J. Woo, A. Schulze, Daeseong Park, W. Kang, Sang Chul Kim, D. Riechers   +5 more
arxiv   +3 more sources

Hundreds of Low-mass Active Galaxies in the Galaxy And Mass Assembly (GAMA) Survey [PDF]

Astrophysical Journal, 2022
We present an entirely new sample of 388 low-mass galaxies (M ⋆ ≤ 1010 M ⊙) that have spectroscopic signatures indicating the presence of massive black holes (BHs) in the form of active galactic nuclei (AGNs) or tidal disruption events. Of these, 70 have
Sheyda Salehirad, A. Reines, M. Molina
semanticscholar   +1 more source

Hidden Hearts of Neutrino Active Galaxies [PDF]

Astrophysical Journal Letters, 2022
Recent multimessenger studies have provided evidence for high-energy neutrino sources that are opaque to GeV–TeV gamma rays. We present model-independent studies on the connection between neutrinos and gamma rays in the active galaxy NGC 1068, and find ...
K. Murase
semanticscholar   +1 more source

Gas filaments of the cosmic web located around active galaxies in a protocluster [PDF]

Science, 2019
Glowing filaments of the cosmic web Most gas in the Universe lies in the intergalactic medium, where it forms into sheets and filaments of the cosmic web.
H. Umehata, M. Fumagalli, M. Fumagalli, I. Smail, Y. Matsuda, A. Swinbank, S. Cantalupo, C. Sykes, R. Ivison, R. Ivison, C. Steidel, A. Shapley, J. Vernet, T. Yamada, Y. Tamura, M. Kubo, K. Nakanishi, M. Kajisawa, B. Hatsukade, K. Kohno   +19 more
semanticscholar   +1 more source

JWST Insight into a Lensed HST-dark Galaxy and Its Quiescent Companion at z = 2.58

The Astrophysical Journal Letters, 2023
Using the novel James Webb Space Telescope (JWST)/NIRCam observations in the A2744 field, we present a first spatially resolved overview of a Hubble Space Telescope (HST)-dark galaxy, spectroscopically confirmed at z = 2.58 with magnification μ ≈ 1.9 ...
Vasily Kokorev, Shuowen Jin, Georgios E. Magdis, Karina I. Caputi, Francesco Valentino, Pratika Dayal, Maxime Trebitsch, Gabriel Brammer, Seiji Fujimoto, Franz Bauer, Edoardo Iani, Kotaro Kohno, David Blánquez Sesé, Carlos Gómez-Guijarro, Pierluigi Rinaldi, Rafael Navarro-Carrera   +15 more
doaj   +1 more source

GOALS-JWST: Mid-infrared Spectroscopy of the Nucleus of NGC 7469

The Astrophysical Journal Letters, 2023
We present mid-infrared spectroscopic observations of the nucleus of the nearby Seyfert galaxy NGC 7469 taken with the MIRI instrument on the James Webb Space Telescope (JWST) as part of Directors Discretionary Time Early Release Science program 1328 ...
L. Armus, T. Lai, V. U, K. L. Larson, T. Diaz-Santos, A. S. Evans, M. A. Malkan, J. Rich, A. M. Medling, D. R. Law, H. Inami, F. Muller-Sanchez, V. Charmandaris, P. van der Werf, S. Stierwalt, S. Linden, G. C. Privon, L. Barcos-Muñoz, C. Hayward, Y. Song, P. Appleton, S. Aalto, T. Bohn, T. Böker, M. J. I. Brown, L. Finnerty, J. Howell, K. Iwasawa, F. Kemper, J. Marshall, J. M. Mazzarella, J. McKinney, E. J. Murphy, D. Sanders, J. Surace   +34 more
doaj   +1 more source

Constraining the photon coupling of ultra-light dark-matter axion-like particles by polarization variations of parsec-scale jets in active galaxies [PDF]

Journal of Cosmology and Astroparticle Physics, 2018
Dark matter may consist of axion-like particles with ultra-low masses. Two-photon interactions of these particles affect the polarization of radiation propagating through the dark matter.
M. Ivanov, M. Ivanov, M. Ivanov, Y. Kovalev, Y. Kovalev, Y. Kovalev, M. Lister, A. Panin, A. Panin, A. Pushkarev, T. Savolainen, T. Savolainen, S. Troitsky   +12 more
semanticscholar   +1 more source

CLEAR: Spatially Resolved Emission Lines and Active Galactic Nuclei at 0.6 < z < 1.3

The Astrophysical Journal, 2023
We investigate spatially resolved emission-line ratios in a sample of 219 galaxies (0.6 < z < 1.3) detected using the G102 grism on the Hubble Space Telescope Wide Field Camera 3 taken as part of the CANDELS Ly α Emission at Reionization survey to ...
Bren E. Backhaus, Joanna S. Bridge, Jonathan R. Trump, Nikko J. Cleri, Casey Papovich, Raymond C. Simons, Ivelina Momcheva, Benne W. Holwerda, Zhiyuan Ji, Intae Jung, Jasleen Matharu   +10 more
doaj   +1 more source

The Mass–Metallicity Relation of Local Active Galaxies [PDF]

Astrophysical Journal, 2019
We systematically measure the gas-phase metallicities and the mass–metallicity relation of a large sample of local active galaxies for the first time. Observed emission-line fluxes from the Sloan Digital Sky Survey are compared to a four-dimensional grid
A. D. Thomas, L. Kewley, M. Dopita, B. Groves, A. Hopkins, R. Sutherland   +5 more
semanticscholar   +1 more source

Reionization with galaxies and active galactic nuclei [PDF]

Monthly notices of the Royal Astronomical Society, 2020
In this work we investigate the properties of the sources that reionized the intergalactic medium (IGM) in the high-redshift Universe. Using a semi-analytical model aimed at reproducing galaxies and black holes in the first ∼1.5 Gyr of the Universe, we
P. Dayal, M. Volonteri, T. R. Choudhury, R. Schneider, M. Trebitsch, N. Gnedin, H. Atek, M. Hirschmann, A. Reines   +8 more
semanticscholar   +1 more source