871 research outputs found
Science Verification Results from PMAS
PMAS, the Potsdam Multi-Aperture Spectrophotometer, is a new integral field
instrument which was commissioned at the Calar Alto 3.5m Telescope in May 2001.
We report on results obtained from a science verification run in October 2001.
We present observations of the low-metallicity blue compact dwarf galaxy
SBS0335-052, the ultra-luminous X-ray Source X-1 in the Holmberg II galaxy, the
quadruple gravitational lens system Q2237+0305 (the "Einstein Cross"), the
Galactic planetary nebula NGC7027, and extragalactic planetary nebulae in M31.
PMAS is now available as a common user instrument at Calar Alto Observatory.Comment: 4 pages, 9 figures (attached in JPEG format), Euro3D Science Workshop
Proceedings, held in Cambridge May 21-23, 2003, to appear in AN (accepted
Astrochemistry and Astrophotonics for an Antarctic Observatory
Due to its location and climate, Antarctica offers unique conditions for
long-period observations across a broad wavelength regime, where important
diagnostic lines for molecules and ions can be found, that are essential to
understand the chemical properties of the interstellar medium. In addition to
the natural benefits of the site, new technologies, resulting from
astrophotonics, may allow miniaturised instruments, that are easier to
winterise and advanced filters to further reduce the background in the
infrared.Comment: 4 pages, to be published in EAS Publications Series, Vol. 40, Proc.
of 3rd ARENA conferenc
Protocol for the Reconstructing Consciousness and Cognition (ReCCognition) Study
Important scientific and clinical questions persist about general anesthesia despite the ubiquitous clinical use of anesthetic drugs in humans since their discovery. For example, it is not known how the brain reconstitutes consciousness and cognition after the profound functional perturbation of the anesthetized state, nor has a specific pattern of functional recovery been characterized. To date, there has been a lack of detailed investigation into rates of recovery and the potential orderly return of attention, sensorimotor function, memory, reasoning and logic, abstract thinking, and processing speed. Moreover, whether such neurobehavioral functions display an invariant sequence of return across individuals is similarly unknown. To address these questions, we designed a study of healthy volunteers undergoing general anesthesia with electroencephalography and serial testing of cognitive functions (NCT01911195). The aims of this study are to characterize the temporal patterns of neurobehavioral recovery over the first several hours following termination of a deep inhaled isoflurane general anesthetic and to identify common patterns of cognitive function recovery. Additionally, we will conduct spectral analysis and reconstruct functional networks from electroencephalographic data to identify any neural correlates (e.g., connectivity patterns, graph-theoretical variables) of cognitive recovery after the perturbation of general anesthesia. To accomplish these objectives, we will enroll a total of 60 consenting adults aged 20–40 across the three participating sites. Half of the study subjects will receive general anesthesia slowly titrated to loss of consciousness (LOC) with an intravenous infusion of propofol and thereafter be maintained for 3 h with 1.3 age adjusted minimum alveolar concentration of isoflurane, while the other half of subjects serves as awake controls to gauge effects of repeated neurobehavioral testing, spontaneous fatigue and endogenous rest-activity patterns
The Disk Mass project; science case for a new PMAS IFU module
We present our Disk Mass project as the main science case for building a new
fiber IFU-module for the PMAS spectrograph, currently mounted at the Cassegrain
focus of the 3.5m telescope on Calar Alto. Compared to traditional long-slit
observations, the large light collecting power of 2-dimensional Integral Field
Units dramatically improves the prospects for performing spectroscopy on
extended low surface brightness objects with high spectral resolution. This
enables us to measure stellar velocity dispersions in the outer disk of normal
spiral galaxies. We describe some results from a PMAS pilot study using the
existing lenslet array, and provide a basic description of the new fiber
IFU-module for PMAS.Comment: 4 pages, 5 figures. Refereed proceeding for the `Euro3D Science
Workshop'. Contains updated layout of PPAK fibers, and improved M/L value for
N398
Integral field spectroscopy of QSO host galaxies
We describe a project to study the state of the ISM in ~20 low redshift
(z<0.3) QSO host galaxies observed with the PMAS integral field spectrograph.
We describe method developement to access the stellar and gas component of the
spectrum without the strong nuclear emission to access the host galaxy
properties also in the central region. It shows that integral field
spectroscopy promises to be very efficient to study the gas distribution and
its velocity field, and also spatially resolved stellar population in the host
galaxies also of luminous AGN.Comment: 4 pages, 6 figures, Euro3D Science Workshop, Cambridge, May 2003, AN,
accepte
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