35 research outputs found
Interactions among intermediate redshift galaxies. The case of SDSSJ134420.86+663717.8
We present the properties of the central supermassive black holes and the
host galaxies of the interacting object SDSSJ134420.86+663717.8. We obtained
optical long slit spectroscopy data from the Large Binocular Telescope (LBT)
using the Multi Object Double Spectrograph (MODS). Analysing the spectra
revealed several strong broad and narrow emission lines of ionised gas in the
nuclear region of one galaxy, whereas only narrow emission lines were visible
for the second galaxy. The optical spectra were used to plot diagnostic
diagrams, deduce rotation curves of the two galaxies, and calculate the masses
of the central supermassive black holes. We find that the galaxy with broad
emission line features has Seyfert~1 properties, while the galaxy with only
narrow emission line features seems to be star-forming in nature. Furthermore,
we find that the masses of the central supermassive black holes are almost
equal at a few times 10^7 solar mass. Additionally, we present a simple N-body
simulation to shed some light on the initial conditions of the progenitor
galaxies. We find that for an almost orthogonal approach of the two interacting
galaxies, the model resembles the optical image of the system
A low-luminosity type-1 QSO sample: II. Tracing circumnuclear star formation in HE 1029-1831 with SINFONI
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. In this paper, we present the results of
near-infrared H+K-integral field spectroscopy of the inner kiloparsecs of the
LLQSO HE 1029-1831 with SINFONI. Line maps show that ionized hydrogen gas is
located in spiral arms within the stellar bar and in a circumnuclear ring. Line
fluxes and diagnostic line ratios indicate recent or ongoing star formation in
the circumnuclear region and the presence of young and intermediate-age stellar
populations in the bulge. In particular, we find traces of an intense starburst
in the circumnuclear region that has begun around 100 Myr ago but has declined
to a fraction of the maximum intensity now. We estimate the dynamical bulge
mass and find that the galaxy follows published M_BH-M_bulge relations.
However, bulge-disk decomposition of the K-band image with BUDDA reveals that
HE 1029-1831 does not follow the M_BH-L_bulge relations of inactive galaxies.
We conclude that the deviation from M_BH-L_bulge relations of inactive galaxies
in this source is rather caused by young stellar populations and not by an
undermassive black hole.Comment: 16 pages, 11 figures, submitted to A&A, comments welcom
Antigen-Specific versus Non-Antigen-Specific Immunoadsorption in ABO-Incompatible Renal Transplantation
Introduction: ABO-incompatible (ABOi) renal transplantation (RTx) from living donors is an established procedure to expand the donor pool for patients with end stage renal disease. Immunoadsorption (IA) is a standard procedure for the removal of preformed antibodies against the allograft. In this study, antigen-specific and non-antigen-specific IA in ABOi RTx were compared. Patients and Methods: 10 patients underwent antigen-specific IA (Glycosorb group) and 13 patients non-antigen-specific IA (Immunosorba group). The effects of both procedures regarding antibody reduction, number of treatments, complications, costs, as well as the allograft function and patient survival were compared between both groups. Results: Although the IgG levels were reduced equally by both procedures (p=0.82), the reduction of the IgM level was more effective in the Glycosorb group (p=0.0172). Patients in both groups required a median number of 6 IA before ABOi RTx. Allograft function at one year after AB0i RTx was similar in both groups (estimated glomerular filtration rate: 66 vs. 64 ml/min/1.73m² respectively), with a death-censored graft survival of 90.0% and 92.3% respectively. Complication rates did not differ between procedures. Due to the reuse of non-antigen-specific Immunosorba columns, costs were considerably lower in this group; however, the use of the Immunosorba-based IA was less time-efficient. Conclusion: Considering upcoming alternatives as simultaneous performance of dialysis and IA or a possible reuse of Glycosorb columns, this might become less relevant in the future
Central kiloparsec of NGC 1326 observed with SINFONI: A nuclear molecular disc inside the starburst ring
Gas inflow processes in the vicinity of galactic nuclei play a crucial role in galaxy evolution and supermassive black hole growth. Exploring the central kiloparsec of galaxies is essential to shed more light on this subject. We present near-infrared H- and K-band results of the nuclear region of the nearby galaxy NGC 1326, observed with the integral-field spectrograph SINFONI mounted on the Very Large Telescope. The field of view covers 9 '' x9 '' (650x650 pc(2)). Our work is concentrated on excitation conditions, morphology, and stellar content. The nucleus of NGC 1326 was classified as a LINER, however in our data we observed an absence of ionised gas emission in the central r similar to 3 ''. We studied the morphology by analysing the distribution of ionised and molecular gas, and thereby detected an elliptically shaped, circum-nuclear star-forming ring at a mean radius of 300 pc. We estimate the starburst regions in the ring to be young with dominating ages of < 10 Myr. The molecular gas distribution also reveals an elongated east to west central structure about 3 '' in radius, where gas is excited by slow or mild shock mechanisms. We calculate the ionised gas mass of 8x10(5)M(circle dot) completely concentrated in the nuclear ring and the warm molecular gas mass of 187 M-circle dot, from which half is concentrated in the ring and the other half in the elongated central structure. The stellar velocity fields show pure rotation in the plane of the galaxy. The gas velocity fields show similar rotation in the ring, but in the central elongated H-2 structure they show much higher amplitudes and indications of further deviation from the stellar rotation in the central 1 '' aperture. We suggest that the central 6 '' elongated H-2 structure might be a fast-rotating central disc. The CO(3-2) emission observations with the Atacama Large Millimeter/submillimeter Array reveal a central 1 '' torus. In the central 1 '' of the H-2 velocity field and residual maps, we find indications for a further decoupled structure closer to a nuclear disc, which could be identified with the torus surrounding the supermassive black hole