scholarly journals Stellar dynamics of galactic nuclei with TIGER

1995 ◽  
Vol 149 ◽  
pp. 282-287 ◽  
Author(s):  
Eric Emsellem ◽  
Roland Bacon ◽  
Guy Monnet
Keyword(s):  
Black Holes ◽  
Galactic Nuclei ◽  
Stellar Dynamics ◽  
Dynamical Structure ◽  
M 31 ◽  
Dynamical Properties ◽  
Integral Field Spectrograph ◽  
Integral Field ◽  
Observational Program

AbstractWe conducted an observational program using the TIGER integral field spectrograph to study the dynamical structure of nearby galactic nuclei. We already obtained new original results on three of the best ”Black Holes Candidates”: M 32, M 31 and M 104. Their nuclei exhibit complex morphologies and unusual dynamical properties such as: asymmetries, anisotropy, triaxiality which would have been impossible to detect with a ”classical“ spectrograph.

scholarly journals Formation and Evolution of Black Holes in Galactic Nuclei and Star Clusters

2007 ◽  
Vol 3 (S246) ◽  
pp. 346-350
Author(s):  
R. Spurzem ◽  
P. Berczik ◽  
I. Berentzen ◽  
D. Merritt ◽  
M. Preto ◽  
...  
Keyword(s):  
Black Holes ◽  
Gravitational Waves ◽  
Star Clusters ◽  
Galactic Nuclei ◽  
Stellar Dynamics ◽  
Compact Objects ◽  
Binary Black Holes ◽  
Black Hole Binaries ◽  
Orbital Parameters ◽  
Work Done

AbstractWe study the formation, growth, and co-evolution of single and multiple supermassive black holes (SMBHs) and compact objects like neutron stars, white dwarfs, and stellar mass black holes in galactic nuclei and star clusters, focusing on the role of stellar dynamics. In this paper we focus on one exemplary topic out of a wider range of work done, the study of orbital parameters of binary black holes in galactic nuclei (binding energy, eccentricity, relativistic coalescence) as a function of initial parameters. In some cases the classical evolution of black hole binaries in dense stellar systems drives them to surprisingly high eccentricities, which is very exciting for the emission of gravitational waves and relativistic orbit shrinkage. Such results are interesting to the emerging field of gravitational wave astronomy, in relation to a number of ground and space based instruments designed to measure gravitational waves from astrophysical sources (VIRGO, Geo600, LIGO, LISA). Our models self-consistently cover the entire range from Newtonian dynamics to the relativistic coalescence of SMBH binaries.

Observations of AGN feeding and feedback on Nuclear, Galactic, and Extragalactic Scales

2019 ◽  
Vol 15 (S359) ◽  
pp. 318-322
Author(s):  
D. Michael Crenshaw ◽  
C. L. Gnilka ◽  
T. C. Fischer ◽  
M. Revalski ◽  
B. Meena ◽  
...  
Keyword(s):  
Near Infrared ◽  
Galactic Nuclei ◽  
Host Galaxies ◽  
Spatially Resolved ◽  
Spatially Resolved Spectroscopy ◽  
Integral Field Spectrograph ◽  
Radiative Acceleration ◽  
Imaging Spectrograph ◽  
Integral Field

AbstractWe investigate the processes of active galactic nuclei (AGN) feeding and feedback in the narrow line regions (NLRs) and host galaxies of nearby AGN through spatially resolved spectroscopy with the Gemini Near-Infrared Integral Field Spectrograph (NIFS) and the Hubble Space Telescope’s Space Telescope Imaging Spectrograph (STIS). We examine the connection between nuclear and galactic inflows and outflows by adding long-slit spectra of the host galaxies from Apache Point Observatory. We demonstrate that nearby AGN can be fueled by a variety of mechanisms. We find that the NLR kinematics can often be explained by in situ ionization and radiative acceleration of ambient gas, often in the form of dusty molecular spirals that may be the fueling flow to the AGN.

scholarly journals Central kinematics of the Galactic globular cluster M80

2021 ◽  
Author(s):  
Fabian Göttgens ◽  
Sebastian Kamann ◽  
Holger Baumgardt ◽  
Stefan Dreizler ◽  
Benjamin Giesers ◽  
...  
Keyword(s):  
Black Holes ◽  
Globular Cluster ◽  
Surface Brightness ◽  
Velocity Dispersion ◽  
Radial Velocities ◽  
Intermediate Mass ◽  
Field Mode ◽  
Radial Profiles ◽  
Integral Field Spectrograph ◽  
Integral Field

Abstract We use spectra observed with the integral-field spectrograph MUSE to reveal the central kinematics of the Galactic globular cluster Messier 80 (M80, NGC 6093). Using observations obtained with the recently commissioned narrow-field mode of MUSE, we are able to analyse 932 stars in the central 7.5 arcsec by 7.5 arcsec of the cluster for which no useful spectra previously existed. Mean radial velocities of individual stars derived from the spectra are compared to predictions from axisymmetric Jeans models, resulting in radial profiles of the velocity dispersion, the rotation amplitude, and the mass-to-light ratio. The new data allow us to search for an intermediate-mass black hole (IMBH) in the centre of the cluster. Our Jeans model finds two similarly probable solutions around different dynamical cluster centres. The first solution has a centre close to the photometric estimates available in the literature and does not need an IMBH to fit the observed kinematics. The second solution contains a location of the cluster centre that is offset by about 2.4 arcsec from the first one and it needs an IMBH mass of $4600^{+1700}_{-1400}~\text{M}_\odot {}$. N-body models support the existence of an IMBH in this cluster with a mass of up to 6000 M⊙ in this cluster, although models without an IMBH provide a better fit to the observed surface brightness profile. They further indicate that the cluster has lost nearly all stellar-mass black holes. We further discuss the detection of two potential high-velocity stars with radial velocities of 80 to 90 km s−1 relative to the cluster mean.

scholarly journals Turbulence/outflows perpendicular to low-power jets in Seyfert galaxies

2019 ◽  
Vol 15 (S359) ◽  
pp. 464-466
Author(s):  
Giacomo Venturi ◽  
Alessandro Marconi ◽  
Matilde Mingozzi ◽  
Giovanni Cresci ◽  
Stefano Carniani ◽  
...  
Keyword(s):  
Low Power ◽  
Active Galactic Nuclei ◽  
Interaction Mechanism ◽  
Galactic Nuclei ◽  
Seyfert Galaxies ◽  
Near Ir ◽  
The Galaxy ◽  
Line Widths ◽  
Integral Field Spectrograph ◽  
Integral Field

AbstractWe present recent results from our MAGNUM survey of nearby active galactic nuclei (AGN), which exploits observations from the optical/near-IR integral field spectrograph MUSE at VLT. We detect strongly enhanced line widths in emission line maps of four galaxies perpendicularly to their low-power jets and AGN ionisation cones, indicative of turbulent/outflowing material. The observation of a similar phenomenon in other works suggests that it originates from an interaction mechanism between the jet and the galaxy disc through which it propagates.

scholarly journals Gas Motion Mapping for Three Seyfert Galaxies

2011 ◽  
Vol 20 (3) ◽  
Author(s):  
A. Smirnova ◽  
A. Moiseev ◽  
I. Katkov ◽  
V. Afanasiev
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Seyfert Galaxies ◽  
Velocity Fields ◽  
Emission Lines ◽  
Ionized Gas ◽  
Preliminary Results ◽  
Fabry Perot ◽  
Integral Field Spectrograph ◽  
Integral Field

AbstractWe report the preliminary results of a kinematical study of three Seyfert galaxies selected from a sample of nearby active galactic nuclei observed using 3D spectroscopy. The observations were performed at the prime focus of the 6 m telescope of SAO RAS with the integral-field spectrograph MPFS and with a scanning Fabry-Pérot interferometer, installed on the multimode device SCORPIO. Based on these data, the monochromatic maps and velocity fields in different emission lines were constructed. We have detected the nuclear outflow or ionized gas motions associated with a radio jet in all the circumnuclear regions of these galaxies.

scholarly journals Spatially Resolved Spectroscopy to Confirm or Disprove Dual Active Galactic Nuclei

2013 ◽  
Vol 9 (S304) ◽  
pp. 371-374
Author(s):  
Rosalie C. McGurk ◽  
Claire E. Max ◽  
Anne Medling ◽  
Gregory A. Shields
Keyword(s):  
Emission Line ◽  
Active Galactic Nuclei ◽  
Adaptive Optics ◽  
Near Infrared ◽  
Galactic Nuclei ◽  
Spatially Resolved ◽  
Spatially Resolved Spectroscopy ◽  
Integral Field Spectrograph ◽  
Guide Star ◽  
Integral Field

AbstractWhen galaxies merge, gas accretes onto both central supermassive black holes. Thus, one expects to see dual active galactic nuclei (AGNs) in a fraction of galaxy mergers. Candidates for galaxies containing dual AGNs have been identified by the presence of double-peaked narrow [O III] emission lines and by high spatial resolution images of close galaxy pairs. 30% of double-peaked narrow [OIII] emission line SDSS AGNs have two spatial components within a 3″ radius. However, spatially resolved spectroscopy is needed to confirm these galaxy pairs as systems with double AGNs. With the Keck 2 Laser Guide Star Adaptive Optics system and the OSIRIS near-infrared integral field spectrograph, we obtained spatially resolved spectra for SDSS J095207.62+255257.2, confirming that it contains a Type 1 and a Type 2 AGN separated by 4.8 kpc (=1.0″). We performed similar integral field and long-slit spectroscopy observations of more spatially separated candidate dual AGNs and will report on the varied results. By assessing what fraction of radio-quiet double-peaked emission line SDSS AGNs are true dual AGNs, we can better constrain the statistics of dual AGNs and characterize physical conditions throughout these interacting AGNs.

scholarly journals Testing the evolution of correlations between supermassive black holes and their host galaxies using eight strongly lensed quasars

2020 ◽  
Vol 501 (1) ◽  
pp. 269-280
Author(s):  
Xuheng Ding ◽  
Tommaso Treu ◽  
Simon Birrer ◽  
Adriano Agnello ◽  
Dominique Sluse ◽  
...  
Keyword(s):  
Black Holes ◽  
Hubble Space Telescope ◽  
High Redshift ◽  
Galactic Nuclei ◽  
Host Galaxy ◽  
Wide Field ◽  
Host Galaxies ◽  
Field Surveys ◽  
Instrumental Resolution ◽  
The Moment

ABSTRACT One of the main challenges in using high-redshift active galactic nuclei (AGNs) to study the correlations between the mass of a supermassive black hole ($\mathcal {M}_{\rm BH}$) and the properties of its active host galaxy is instrumental resolution. Strong lensing magnification effectively increases instrumental resolution and thus helps to address this challenge. In this work, we study eight strongly lensed AGNs with deep Hubble Space Telescope imaging, using the lens modelling code lenstronomy to reconstruct the image of the source. Using the reconstructed brightness of the host galaxy, we infer the host galaxy stellar mass based on stellar population models. $\mathcal {M}_{\rm BH}$ are estimated from broad emission lines using standard methods. Our results are in good agreement with recent work based on non-lensed AGNs, demonstrating the potential of using strongly lensed AGNs to extend the study of the correlations to higher redshifts. At the moment, the sample size of lensed AGNs is small and thus they provide mostly a consistency check on systematic errors related to resolution for non-lensed AGNs. However, the number of known lensed AGNs is expected to increase dramatically in the next few years, through dedicated searches in ground- and space-based wide-field surveys, and they may become a key diagnostic of black holes and galaxy co-evolution.

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