189 citations · 900 across the 23 of their papers we have counts for
25 papers
Gemini North Adaptive Optics (GNAO) facility overview and status updates
Gaetano Sivo, Julia Scharwächter, Manuel Lazo +54
The Gemini North Adaptive Optics (GNAO) facility is the upcoming AO facility for Gemini North providing a state-of-the-art AO system for surveys and time domain science in the era…
The Close AGN Reference Survey (CARS): IFU survey data and the BH mass dependence of long-term AGN variability
B. Husemann, M. Singha, J. Scharwächter +19
[Abridged] AGN are thought to be intimately connected with their host galaxies through feeding and feedback processes. A spatially resolved multiwavelength survey is required to ma…
Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI
Gerold Busch, Andreas Eckart, Mónica Valencia-S. +4
NGC 1808 is a nearby barred spiral galaxy which hosts young stellar clusters in a patchy circumnuclear ring with a radius of . In order to study the gaseous…
The Close AGN Reference Survey (CARS) - What is causing Mrk1018's return to the shadows after 30 years?
B. Husemann, T. Urrutia, G. R. Tremblay +11
We recently discovered that the active galactic nucleus (AGN) of Mrk 1018 has changed optical type again after 30 years as a type 1 AGN. Here we combine Chandra, NuStar, Swift, Hub…
Dissecting Galaxies: Spatial and Spectral Separation of Emission Excited by Star Formation and AGN Activity
Rebecca L. Davies, Brent Groves, Lisa J. Kewley +13
The optical spectra of Seyfert galaxies are often dominated by emission lines excited by both star formation and AGN activity. Standard calibrations (such as for the star formation…
Large-scale outflows in luminous QSOs revisited: The impact of beam smearing on AGN feedback efficiencies
B. Husemann, J. Scharwächter, V. N. Bennert +3
[Abridged] Enormous observational efforts have been made to constrain the energetics of AGN feedback by mapping the kinematics of the ionized gas on kpc scale. We study how the obs…
A low-luminosity type-1 QSO sample. V. Overluminous host spheroids and their excitation mechanisms
Gerold Busch, Nastaran Fazeli, Andreas Eckart +6
We present near-infrared (NIR) -band longslit spectra of eleven galaxies which are obtained with SOFI at the NTT (ESO). The galaxies are chosen from the low-luminosity type-1…
The MUSE view of QSO PG1307+085: An elliptical galaxy on the relation interacting with its group environment
B. Husemann, V. N. Bennert, J. Scharwächter +2
We report deep optical integral-field spectroscopy with the MUSE of the luminous radio-quiet QSO PG1307+085 (z=0.154) obtained during the commissioning of the instrument. Given the…
The WiFeS S7 AGN survey: Current status and recent results on NGC 6300
J. Scharwächter, M. A. Dopita, P. Shastri +14
The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7) is a targeted survey probing the narrow-line regions (NLRs) of a representative sample of ~140 nearby (z<0.02)…
The overmassive black hole in NGC 1277: new constraints from molecular gas kinematics
J. Scharwächter, F. Combes, P. Salomé +2
We report the detection of CO(1-0) emission from NGC 1277, a lenticular galaxy in the Perseus Cluster. NGC 1277 has previously been proposed to host an overmassive black hole (BH)…
Probing the Physics of Narrow Line Regions in Active Galaxies III: Accretion and Cocoon Shocks in the LINER NGC1052
Michael A. Dopita, I-Ting Ho, Linda L. Dressell +16
We present Wide Field Spectrograph (WiFeS) integral field spectroscopy and HST FOS spectroscopy for the LINER galaxy NGC 1052. We infer the presence of a turbulent accretion flow f…
Probing the Physics of Narrow Line Regions in Active Galaxies II: The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7)
Michael A. Dopita, Prajval Shastri, Rebecca Davies +14
Here we describe the \emph{Siding Spring Southern Seyfert Spectroscopic Snapshot Survey} (S7) and present results on 64 galaxies drawn from the first data release. The S7 uses the…
A low-luminosity type-1 QSO sample: II. Tracing circumnuclear star formation in HE 1029-1831 with SINFONI
Gerold Busch, Semir Smajić, Julia Scharwächter +6
Circumnuclear star formation and AGN feedback is believed to play a critical role in the context of galaxy evolution. The low-luminosity QSO (LLQSO) sample that contains 99 of the…
S7 : Probing the physics of Seyfert Galaxies through their ENLR & HII Regions
Michael A. Dopita, Prajval Shastri, Julia Scharwachter +13
Here we present the first results from the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7) which aims to investigate the physics of ~140 radio-detected southern a…
Galaxy emission line classification using 3D line ratio diagrams
Frédéric P. A. Vogt, Michael A. Dopita, Lisa J. Kewley +5
Two-dimensional (2D) line ratio diagnostic diagrams have become a key tool in understanding the excitation mechanisms of galaxies. The curves used to separate the different regions…
Probing the physics of narrow-line regions of Seyfert galaxies I: The case of NGC 5427
Michael A. Dopita, Julia Scharwaechter, Prajval Shastri +10
We have used the Wide Field Spectrograph (WiFeS) on the ANU 2.3m telescope at Siding Spring to observe the nearby, nearly face-on, Seyfert 2 galaxy, NGC 5427. We have obtained inte…
A low-luminosity type-1 QSO sample: I. Overluminous host spheroidals or undermassive black holes?
Gerold Busch, Jens Zuther, Mónica Valencia-S. +6
Recognizing the properties of the host galaxies of quasi-stellar objects (QSOs) is essential to understand the suspected coevolution of central supermassive black holes (BHs) and t…
Strong UV and X-ray variability of the Narrow Line Seyfert 1 Galaxy WPVS 007 -- on the nature of the X-ray low state
Dirk Grupe, S. Komossa, Julia Scharwaechter +4
We report on multi-wavelength observations of the X-ray transient Narrow Line Seyfert 1 (NLS1) galaxy WPVS 007. The galaxy was monitored with Swift between October 2005 and July 20…
The Central 3 kpc of NGC 5850
M. Bremer, J. Scharwächter, A. Eckart +5
NGC 5850 is a nearby (z=0.0085) early type spiral galaxy classified as LINER. It is considered as a prototype double-barred system. Our optical Integral Field Spectroscopic (IFS) d…
Kinematics and Excitation of the Molecular Hydrogen Accretion Disc in NGC 1275
J. Scharwaechter, P. J. McGregor, M. A. Dopita +1
We report the results of high spatial and spectral resolution integral-field spectroscopy of the central ~3 x 3 arcsec^2 of the active galaxy NGC 1275 (Perseus A), based on observa…
The Arp 220 merger on kpc scales
S. König, M. García-Marín, A. Eckart +2
For the first time we study the Eastern nucleus in greater detail and search for the more extended emission in the molecular gas in different CO line transitions of the famous ULIR…
Eliminating Error in the Chemical Abundance Scale for Extragalactic HII Regions
Angel R. Lopez-Sanchez, M. A. Dopita, L. J. Kewley +3
In an attempt to remove the systematic errors which have plagued the calibration of the HII region abundance sequence, we have theoretically modeled the extragalactic HII region se…
Optical Integral Field Spectroscopy of NGC 5850
M. Bremer, J. Scharwächter, A. Eckart +3
Here we present the preliminary results of the analysis of VIMOS observations of the central 4.5 kpc of the double-barred galaxy NGC 5850. We use optical diagnostic diagrams to stu…
The Merger QSO 3C 48 and its Host Galaxy in the Near Infrared
J. Zuther, A. Eckart, J. Scharwaechter +3
In this contribution we present new near-infrared (NIR) data on the quasar 3C 48 and its host galaxy, obtained with ISAAC at the Very Large Telescope (ESO, Chile). The NIR images a…