Results 1 to 10 of about 4,276,842 (144)

Starburst99: Synthesis Models for Galaxies with Active Star Formation [PDF]

open access: bronze, 1999
Starburst99 is a comprehensive set of model predictions for spectrophotometric and related properties of galaxies with active star formation. The models are an improved and extended version of the data set previously published by Leitherer & Heckman.
Claus Leitherer   +17 more
openalex   +3 more sources

The search for active black holes in nearby low-mass galaxies using optical and mid-IR data [PDF]

open access: bronze, 2015
We investigated AGN activity in low-mass galaxies, an important regime that can shed light onto BH formation and evolution, and their interaction with their host galaxies.
Lia F. Sartori   +6 more
openalex   +3 more sources

Hidden Hearts of Neutrino Active Galaxies [PDF]

open access: yesAstrophysical 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

Reionization with galaxies and active galactic nuclei [PDF]

open access: yesMonthly 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   +8 more
semanticscholar   +1 more source

Star formation history in barred spiral galaxies – active galactic nucleus feedback [PDF]

open access: yes, 2017
We present a numerical study of the impact of AGN accretion and feedback on the star formation history of barred disc galaxies. Our goal is to determine whether the effect of feedback is positive (enhanced star formation) or negative (quenched star ...
Fidèle Robichaud   +4 more
semanticscholar   +1 more source

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

open access: yesScience, 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   +19 more
semanticscholar   +1 more source

Emission lines in early-type galaxies: active nuclei or stars? [PDF]

open access: yes, 2011
We selected 27 244 nearby, red, giant early-type galaxies (RGEs) from the Sloan Digital Sky Survey (SDSS). In a large fraction (53%) of their spectra the [O III]λ5007 emission line is detected, with an equivalent width (EW) distribution strongly ...
A. C. U. D. Torino   +3 more
semanticscholar   +1 more source

A Multi-Transition HCN and HCO+ Study of 12 Nearby Active Galaxies: Active Galactic Nucleus versus Starburst Environments [PDF]

open access: yes, 2007
Recent studies have indicated that the HCN-to-CO(J = 1–0) and HCO+-to-HCN(J = 1–0) ratios are significantly different between galaxies with AGN (active galactic nucleus) and SB (starburst) signatures.
M. Krips   +6 more
semanticscholar   +1 more source

Mid-infrared imaging of active galaxies. Active nuclei and embedded star clusters [PDF]

open access: yes, 2005
High resolution, mid-infrared (MIR) images of nine nearby active galaxies are presented. The data were obtained with the TIMMI 2 instrument mounted at the ESO 3.6 m telescope using a set of N -band narrow filters.
E. Galliano   +4 more
semanticscholar   +1 more source

VLBI Imaging of Luminous Infrared Galaxies: Active Galactic Nucleus Cores in Markarian 231, UGC 5101, and NGC 7469 [PDF]

open access: yes, 2003
We report 18 cm VLBI continuum imaging observations at ~5 mas resolution for UGC 5101, NGC 7469, and Mrk 231, all part of a sample of luminous infrared galaxies that were shown to have strong VLBI radio cores in a previous 18 cm VLBI survey.
C. Lonsdale   +3 more
semanticscholar   +1 more source

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