Lydia Moser
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University of Cologne | UOC · I. Institute of Physics
I. Institute of Physics Köln, Germany
We investigate an infrared-excess source called G2 or Dusty S-cluster Object (DSO) moving on a highly eccentric orbit around the Galaxy's central black hole, Sgr A*. We use, for the first time, near-infrared polarimetric imaging data to determine the nature and the properties of the DSO, and obtain an improved K_s-band identification of this source...
We report serendipitous detections of line emission with ALMA in band 3, 6, and 7 in the central parsec of the Galactic center at an up to now highest resolution (<0.7″). Among the highlights are the very first and highly resolved images of sub-mm molecular emission of CS, H ¹³ CO ⁺ , HC 3 N, SiO, SO, C 2 H, and CH 3 OH in the immediate vicinity (~...
We report serendipitous detections of line emission with the Atacama Large Millimeter/submillimeter Array (ALMA) in band 3, 6, and 7 in the central parsec down to within 1" around Sgr A* at an up to now highest resolution (<0.5") view of the Galactic Center (GC) in the sub-millimeter (sub-mm) domain. From the 100 GHz continuum and the H39\alpha emi...
We present a pilot study of ∼3 resolution observations of low CO transitions with the Submillimeter Array in three nearby Seyfert galaxies, which are part of the low-luminosity quasi-stellar object (LLQSOs) sample consisting of 99 nearby (z = 0.06) type-1 active galactic nuclei (AGN) taken from the Hamburg/ESO quasi-stellar object (QSO) survey. Two...
Integral-field spectroscopy in the near-infrared (NIR) is a powerful tool to
analyze the gaseous and stellar distributions and kinematics, as well as the
excitation mechanisms in the centers of galaxies. The unique combination of NIR
and sub-mm data at comparable high angular resolution, which has just been
possible with SINFONI and ALMA, allows to...
We present near-infrared (NIR) $H+K$-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 quasi-stellar object (LLQSO) sample which comprises the
99 closest ($z\leq 0.06$) QSOs from the Hamburg/ESO survey for bright UV-excess
QSOs. These objects are ideal targ...
We present the results of near-infrared H- and K-band European Southern
Observatory SINFONI integral field spectroscopy of the Seyfert galaxy NGC 1566.
We investigate the central kpc of this nearby galaxy, concentrating on
excitation conditions, morphology, and stellar content. NGC 1566 was selected
from our NUGA (-south) sample and is a ringed, sp...
The properties of the host galaxies of quasi-stellar objects (QSOs) are essential for the understanding of the suspected coevolution of central supermassive black holes (BHs) and their host galaxies. In Busch et al. (2014), we present a study of 20 low-luminosity type-1 QSOs (LLQSO; Busch et al.2012) that have been selected from the Hamburg/ESO sur...
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 closest AGN with redshift z<=0.06 fills the gap between
the local AGN population and high-redshift QSOs that is essential to understand
the AGN evolution with redshift. I...
We analyse and report in detail new near-infrared (1.45 - 2.45 microns) observations of the
Dusty S-cluster Object (DSO/G2) during its approach to the black hole at the center of the
Galaxy that were carried out with ESO VLT/SINFONI between February and September 2014.
Before May 2014 we detect spatially compact Br
and Pa� line emission from the DS...
We present the very first detection of N2H+
J = (1 – 0) and CH3OH(2k−1k) line emission on 5″ scales in the circumnuclear disk (CND) around Sgr A*. The emission matches the position and shape of the dark clouds in the near-infrared. Our findings suggest that these molecular clouds in the eastern CND are significantly colder and denser than the rest...
We find a convex-like feature at a distance of 0.68 pc (17″) from the position of the supermassive black hole, Sgr A*, at the center of the nuclear stellar cluster. This feature resembles a stellar bow shock with a symmetry axis pointing to the center. We discuss the possible nature of the feature and the implications of its alignment with other du...
It is often assumed that the strong gravitational field of a super-massive black hole disrupts an adjacent molecular cloud
preventing classical star formation in the deep potential well of the black hole. Yet, young stars have been observed across
the entire nuclear star cluster of the Milky Way including the region close (<0.5 pc) to the central b...
We present the results of near-infrared (NIR) H- and K-band European Southern
Observatory SINFONI integral field spectroscopy (IFS) of the Seyfert 2 galaxy
NGC 1433. We present emission and absorption line measurements in the central
kpc of NGC 1433. We detect a narrow Balmer line and several H2 lines. We find
that the stellar continuum peaks in th...
The results of the structural decomposition with BUDDA are presented here. The galaxies have been observed in the near-infrared J, H, and K band. For each band, there is one table. For all 20 galaxies the following parameters are presented: central surface brightness and scale length of the disk, effective surface brightness, effective radius and S...
We aim at modelling small groups of young stars such as IRS 13N, 0.1 pc away
from Sgr A*, which is suggested to contain a few embedded massive young stellar
objects. We perform hydrodynamical simulations to follow the evolution of
molecular clumps orbiting about a $4\times10^6 ~ M_{\odot}$ black hole, to
constrain the formation and the physical con...
The super-massive 4 million solar mass black hole (SMBH) SgrA* shows flare
emission from the millimeter to the X-ray domain. The nucleus of the Milky Way
has properties (stellar cluster, young stars, molecular gas and an accreting
SMBH) that resemble those of currently higher luminous Low Luminosity Active
Galactic Nuclei. A detailed analysis of th...
A fast moving infrared excess source (G2) which is widely interpreted as a core-less gas and dust cloud approaches Sagittarius A* (Sgr A*) on a presumably elliptical orbit. VLT Ks
-band and Keck K′-band data result in clear continuum identifications and proper motions of this ∼19
m
Dusty S-cluster Object (DSO). In 2002-2007 it is confused with the...
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 their host galaxies. We selected a subsample
of the Hamburg/ESO survey for bright UV-excess QSOs, containing only the 99
nearest QSOs with redshift z<=0.06, that are close...
The low luminosity QSO (LLQSO) sample consists of type 1 active galactic
nuclei (AGN) up to a redshift of z=0.06 in the Hamburg/ESO QSO survey. Its
purpose is to study how the brightest AGN in the nearby universe evolve with
respect to AGN activity and host properties as a function of redshift. We show
that our sample lies well between the NUclei o...
There is growing evidence that every galaxy with a considerable spheroidal
component hosts a supermassive black hole (SMBH) at its center. Strong
correlations between the SMBH and the spheroidal component suggest a physical
connection through a coevolutionary scenario. For very massive galaxies a
merger-driven scenario is preferred, resulting in el...
No. Due to their apparently extreme optical to X-ray properties, Narrow Line Seyfert 1s (NLSy1s) have been considered a special class of active galactic nuclei (AGN). Here, we summarize observational results from different groups to conclude that none of the characteristics that are typically used to define the NLSy1s as a distinct group - from the...
There are a number of faint compact infrared excess sources in the central
stellar cluster of the Milky Way. Their nature and origin is unclear. In
addition to several isolated objects of this kind we find a small but dense
cluster of co-moving sources (IRS13N) about 3" west of SgrA* just 0.5" north of
the bright IRS13E cluster of WR and O-type sta...
The super-massive 4 million solar mass black hole (SMBH) SgrA* shows variable
emission from the millimeter to the X-ray domain. A detailed analysis of the
infrared light curves allows us to address the accretion phenomenon in a
statistical way. The analysis shows that the near-infrared flux density
excursions are dominated by a single state power l...
Based on Bremer et al. (2011) and Eckart et al. (2012) we report on
simultaneous observations and modeling of the millimeter, near-infrared, and
X-ray flare emission of the source Sagittarius A* (SgrA*) associated with the
super-massive black hole at the Galactic Center. We study physical processes
giving rise to the variable emission of SgrA* from...
The starburst/Seyfert composite galaxy IRAS 01072+4954 (z = 0.0236) is
an enigmatic source that combines a Seyfert 1-like X-ray emission with a
starburst optical spectrum that lacks broad line emission. We performed
High Angular Resolution observations of the central kiloparsec of this
galaxy in the near-infrared. Combining our data with 2MASS imag...
LINC-NIRVANA (LN) is a German/Italian interferometric beam combiner camera for the Large Binocular Telescope. Due to homothetic imaging, LN will make use of an exceptionally large field-of-view. As part of LN, the Fringe-and-Flexure-Tracker system (FFTS) will provide real-time, closed-loop measurement and correction of pistonic and flexure signals...
LINC-NIRVANA is the NIR homothetic imaging camera for the Large Binocular Telescope (LBT). In close cooperation with the Adaptive Optics systems of LINC-NIRVANA the Fringe and Flexure Tracking System (FFTS) is a fundamental component to ensure a complete and time-stable wavefront correction at the position of the science detector in order to allow...
LINC-NIRVANA (LN) is a German/Italian interferometric beam combiner camera for the Large Binocular Telescope. Due to homothetic imaging, LN will make use of an exceptionally large field-of-view. As part of LN, the Fringe-and-Flexure-Tracker system (FFTS) will provide real-time, closed-loop measurement and correction of pistonic and flexure signals...
We present the latest status of the fringe detecting algorithms for the LINC-NIRVANA FFTS (Fringe and Flexure Tracker System). The piston and PSF effects of the system from the top of the atmosphere through the telescopes and multi-conjugate AO systems to the detector are discussed and the resulting requirements for the FFTS outlined.
LINC-NIRVANA is the near-infrared Fizeau interferometric imaging camera for the Large Binocular Telescope (LBT). For an efficient interferometric operation of LINC-NIRVANA the Fringe and Flexure Tracking System (FFTS) is mandatory: It is a real-time servo system that allows to compensate atmospheric and instrumental optical pathlength differences (...
The Fringe and Flexure Tracker System (FFTS) of the LINC-NIRVANA instrument is designed to monitor and correct the atmospheric piston variations and the instrumental vibrations and flexure at the LBT during the NIR interferometric image acquisition. In this contribution, we give an overview of the current FFTS control design, the various subsystems...
LINC-NIRVANA is the NIR homothetic imaging camera for the Large Binocular Telescope (LBT). In close cooperation with the Adaptive Optics systems of LINC-NIRVANA the Fringe and Flexure Tracking System (FFTS) is a fundamental component to ensure a complete and time-stable wavefront correction at the position of the science detector in order to allow...
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