Browsing by Author "Riffel, Rogemar André"
Now showing items 1-20 of 123
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A 0.8-2.4 μm spectral atlas of active galactic nuclei
(2006) [Journal article]Aims. We present a near-infrared spectral atlas of 47 active galactic nuclei (AGN) of all degrees of activity in the wavelength interval of 0.8–2.4 μm, including the fluxes of the observed emission lines. We analyze the ... -
Active galactic nuclei signatures in Red Geyser galaxies from Gemini GMOS-IFU observations
(2022) [Journal article]Red Geysers are quiescent galaxies with galactic scale ionized outflows, likely due to low-luminosity active galactic nuclei (AGN). We used Gemini GMOS-IFU observations of the inner~1–3 kpc of nine Red Geysers selected ... -
Active galactic nuclei winds as the origin of the H2 emission excess in nearby galaxies
(2020) [Journal article]In most galaxies, the fluxes of rotational H2 lines strongly correlate with star formation diagnostics [such as polycyclic aromatic hydrocarbons (PAHs)], suggesting that H2 emission from warm molecular gas is a minor ... -
Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
(2008) [Journal article]Aims. We derive the age and metallicity of circumnuclear star formation regions (CNSFRs) located in the spiral galaxies NGC6951 and NGC1097 and investigate the cause of the very low equivalent widths of emission lines found ... -
AGN feedback and star formation in the peculiar galaxy NGC 232 : insights from VLT-MUSE observations
(2024) [Journal article]We use VLT-MUSE integral field unit data to study the ionized gas physical properties and kinematics as well as the stellar populations of the Seyfert 2 galaxy NGC 232 as an opportunity to understand the role of AGN feedback ... -
AGNIFS survey of local AGN : GMOS-IFU data and outflows in 30 sources
(2021) [Journal article]We analyse optical data cubes of the inner kiloparsec of 30 local (z ≤ 0.02) active galactic nucleus (AGN) hosts that our research group, AGNIFS, has collected over the past decade via observations with the integral field ... -
AGN–starburst connection in NGC 7582 : Gemini near-infrared spectrograph integral field unit observations
(2009) [Journal article]We analyse two-dimensional near-infrared K-band spectra from the inner 660 × 315 pc² of the Seyfert galaxy NGC7582 obtained with the Gemini near-infrared spectrograph integral field unit at a spatial resolution of ≈50 pc ... -
An outflow in the Seyfert ESO 362-G18 revealed by Gemini-GMOS/IFU observations
(2018) [Journal article]We present two-dimensional stellar and gaseous kinematics of the inner 0.7 × 1.2 kpc2 of the Seyfert 1.5 galaxy ESO 362-G18, derived from optical (4092–7338 Å) spectra obtained with the GMOS integral field spectrograph on ... -
An outflow perpendicular to the radio jet in the Seyfert nucleus of NGC 5929
(2013) [Journal article]We report the observation of an outflow perpendicular to the radio jet in near-infrared integral field spectra of the inner 250 pc of the Seyfert 2 galaxy NGC 5929. The observations were obtained with the Gemini Near-infrared ... -
Atividade Nuclear na rádio galáxia Arp102 B
(2009) [Abstract published in event] -
Chemical abundances in Seyfert galaxies : IX. Helium abundance estimates
(2022) [Journal article]For the first time, the helium abundance relative to hydrogen (He/H), which relied on direct measurements of the electron temperature, has been derived in the narrow line regions (NLRs) from a local sample of Seyfert 2 ... -
Chemical abundances in Seyfert galaxies : VII. Direct abundance determination of neon based on optical and infrared emission lines
(2021) [Journal article]For the first time, neon abundance has been derived in the narrow line region from a sample of Seyfert 2 nuclei. In view of this, we compiled from the literature fluxes of optical and infrared (IR) narrow emission lines ... -
Chemical abundances in Seyfert galaxies : V. The discovery of shocked emission outside the AGN ionization axis
(2021) [Journal article]We present maps for the electron temperature in the inner kpc of three luminous Seyfert galaxies: Mrk 79, Mrk 348, and Mrk 607 obtained from Gemini Multi-Object Spectrograph-integral field unit observations at spatial ... -
Chemical abundances in Seyfert galaxies : X. sulphur abundance estimates
(2023) [Journal article]For the first time, the sulphur abundance relative to hydrogen (S/H) in the narrow-line regions of a sample of Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation of the electron temperature. Narrow emission-line ... -
Circumnuclear star formation in Mrk 42 mapped with Gemini Near-infrared Integral Field Spectrograph
(2018) [Journal article]We present Gemini Near-infrared Integral Field Spectrograph (NIFS) observations of the inner 1.5 × 1.5 kpc2 of the narrow-line Seyfert 1 galaxy Mrk 42 at a spatial resolution of 60 pc and spectral resolution of 40 kms−1. ... -
A close look at the dwarf AGN of NGC 4395 : optical and near-IR integral field spectroscopy
(2019) [Journal article]Intermediate-mass black holes (103–105 M⊙) in the centre of dwarf galaxies are believed to be analogous to growing active galactic nuclei (AGNs) in the early Universe. Their characterization can provide insight about the ... -
Cold molecular gas outflow encasing the ionized one in the Seyfert galaxy NGC 3281
(2023) [Journal article]We present ALMA CO (2-1) observations of the Seyfert 2 galaxy NGC 3281 at ∼100 pc spatial resolution. This galaxy was previously known to present a bi-conical ionized gas outflow extending to 2 kpc from the nucleus. The ... -
Compact molecular disc and ionized gas outflows within 350 pc of the active nucleus of Mrk 1066
(2011) [Journal article]We present stellar and gaseous kinematics of the inner ≈350-pc radius of the Seyfert galaxy Mrk 1066 derived from J and Kl bands data obtained with the Gemini’s Near-Infrared Integral Field Spectrograph (NIFS) at a spatial ... -
Constraints on the broad-line region properties and extinction in local Seyferts
(2016) [Journal article]We use high-spectral resolution (R>8000) data covering 3800–13 000 Å to study the physical conditions of the broad-line region (BLR) of nine nearby Seyfert 1 galaxies. Up to six broad HI lines are present in each spectrum. ... -
A correlation between the stellar and [Fe II] velocity dispersions in active galaxies
(2013) [Journal article]We use near-infrared (near-IR) spectroscopic data from the inner few hundred parsecs of a sample of 47 active galaxies to investigate possible correlations between the stellar velocity dispersion (σ ), obtained from the ...
