Results 21 to 30 of about 4,398,607 (320)

A New Method to Measure Star Formation Rates in Active Galaxies Using Mid-infrared Neon Emission Lines [PDF]

open access: yesAstrophysical Journal, 2019
The star formation rate (SFR) is one of the most fundamental parameters of galaxies, but nearly all of the standard SFR diagnostics are difficult to measure in active galaxies because of contamination from the active galactic nucleus (AGN).
Ming-Yang Zhuang, L. Ho, J. Shangguan
semanticscholar   +1 more source

Evidence for a Young Stellar Population in Nearby Type 1 Active Galaxies [PDF]

open access: yesAstrophysical Journal, 2019
To understand the physical origin of the close connection between supermassive black holes (BHs) and their host galaxies, it is vital to investigate star formation properties in active galaxies.
Minjin Kim, L. Ho
semanticscholar   +1 more source

Testing the Radio-selection Method of Dual Active Galactic Nuclei in the Stripe 82 Field

open access: yesThe Astrophysical Journal, 2023
We test the merger-induced dual active galactic nuclei (dAGNs) paradigm using a sample of 35 radio galaxy pairs from the Sloan Digital Sky Survey Stripe 82 field.
Arran C. Gross   +5 more
doaj   +1 more source

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

open access: yes, 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.
C. Leitherer   +8 more
semanticscholar   +1 more source

Hydrodynamical Simulations of the Triggering of Nuclear Activities by Minor Mergers of Galaxies [PDF]

open access: yes2019, Research in Astronomy and Astrophysics, 19, 177, 2021
Major mergers of galaxies are considered to be an efficient way to trigger Active Galactic Nuclei and are thought to be responsible for the phenomenon of quasars. This has however recently been challenged by observations of a large number of low luminosity Active Galactic Nuclei at low redshift ($z\lesssim1$) without obvious major merger signatures ...
arxiv   +1 more source

Shock Excitation in Narrow-line Regions Powered by AGN Outflows

open access: yesThe Astrophysical Journal, 2023
Outflows in an active galactic nucleus (AGN) are considered to play a key role in the evolution of the host galaxy through transfer of a large amount of energy.
Misaki Mizumoto   +12 more
doaj   +1 more source

Systematic Research of Low-redshift Optically Selected SDSS Type 2 AGNs but with Apparent Long-term Optical Variabilities from Catalina Sky Survey. I. Data Sample and Basic Results

open access: yesThe Astrophysical Journal Supplement Series, 2023
The main objective of this article, the first in a dedicated series, is to report basic results on systematic research of low-redshift optically selected SDSS Type 2 active galactic nuclei (AGNs) but with apparent optical variabilities.
XueGuang Zhang
doaj   +1 more source

Identification and Characterization of a Large Sample of Distant Active Dwarf Galaxies in XMM-SERVS

open access: yesThe Astrophysical Journal, 2023
Active dwarf galaxies are important because they contribute to the evolution of dwarf galaxies and can reveal their hosted massive black holes. However, the sample size of such sources beyond the local universe is still highly limited.
Fan Zou   +12 more
doaj   +1 more source

Reverberation Mapping of Optical Emission Lines in Five Active Galaxies [PDF]

open access: yes, 2016
We present the first results from an optical reverberation mapping campaign executed in 2014 targeting the active galactic nuclei (AGNs) MCG+08-11-011, NGC 2617, NGC 4051, 3C 382, and Mrk 374.
M. Fausnaugh   +75 more
semanticscholar   +1 more source

The effect of environment on AGN activity: the properties of radio and optical AGN in void, isolated and group galaxies [PDF]

open access: yes, 2021
The evolution of galaxies depends on their environments. In this work, active galactic nucleus (AGN) activity in different environments has been studied. The fractions of radio and optical AGN in four different environments have been compared using samples of void, isolated, group member, and the brightest group galaxies (BGGs).
arxiv   +1 more source

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