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Thermonuclear X-ray bursts from the 401 Hertz accreting pulsar IGR J17498-2921: indication of burning in confined regions
Thermonuclear X-ray bursts pulsar IGR J17498-2921 indication confined regions
2012/2/23
We use the 2011 Rossi X-ray Timing Explorer (RXTE) proportional counter array (PCA) data of the 401 Hz accreting pulsar and burster IGR J17498-2921 to perform timing analysis and time-resolved spectro...
Continuous upflows and sporadic downflows observed in active regions
Sun : corona – Sun: transition region – Sun : UV radiation
2011/9/30
We present a study of the temporal evolution of coronal loops in active regions and its implications for the dynamics in coronal loops. We analyzed images of the Atmospheric Imaging Assembly (AIA) on ...
Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations
Oscillations, Solar Radio Emission Radio Bursts, Association with Flares
2011/9/29
The sunspot-associated sources at the frequency of 17 GHz give information on plasma parameters in the regions of magnetic field about B=2000 G at the level of the chromosphere-corona transition regio...
Dissecting high-mass star-forming regions; tracing back their complex formation history
Dissecting high-mass star-forming regions complex formation history
2011/8/24
We present near-infrared JHKs imaging as well as K-band multi-object spectroscopy of the massive stellar content of W3 Main using LUCI at the LBT. We confirm 13 OB stars by their absorption line spect...
Deconvolution of Images from BLAST 2005: Insight into the K3-50 and IC 5146 Star-Forming Regions
BLAST 2005 the K3-50 IC 5146 Star-Forming Regions
2011/1/10
We present an implementation of the iterative flux-conserving Lucy-Richardson (L-R) deconvolution method of image restoration for maps produced by the Balloon-borne Large Aperture Submillimeter Telesc...
Orientation effects in quasar spectra: The broad- and narrow-line regions
Orientation effects quasar spectra
2011/1/11
We use the SDSS, along with the NVSS and the WENSS to define a sample of 746 radio-loud quasars and measure their 330MHz to 1.4GHz spectral indexes. Following previous authors we take the spectral ind...
High-Entropy Polar Regions Around the First Protostars
High-Entropy Polar Regions the First Protostars
2011/1/13
We report on simulations of the formation of the first stars in the Universe, where we identify regions of hot atomic gas (fH2 < 10-6) at densities above 10-14 g/cc, heated to temperatures ranging bet...
The HDO/H2O ratio in gas in the inner regions of a low-mass protostar
astrochemistry — stars formation — protoplanetary disks —ISM
2010/11/15
The HDO/H2O abundance ratio is thought to be a key diagnostic on the evolution of water during the star- and planet-formation process and thus on its origin on Earth. We here present millimeter-wavele...
Detection of Supergranulation Alignment in Polar Regions of the Sun by Helioseismology
convection — Sun helioseismology
2010/11/10
We report on a new phenomenon of ‘alignment’ of supergranulation cells in the polar regions of the Sun. Recent high-resolution datasets obtained by the Solar Optical Telescope (SOT) onboard the Hinode...
Uncovering Mechanisms of Coronal Magnetism via Advanced 3D Modeling of Flares and Active Regions
Uncovering Mechanisms of Coronal Magnetism 3D Modeling of Flares Active Regions
2010/11/15
The coming decade will see the routine use of solar data of unprecedented spatial and spectral resolution, time cadence, and completeness. To capitalize on the new (or soon to be available) facilities...
Abundance determination in HII regions from spectra without the [OII]3727+3729 line
galaxies abundances – ISM abundances – Hii regions
2010/11/11
We suggest an empirical calibration for determination of oxygen and nitrogen abundances and
electron temperature in Hii regions where the [Oii]3727+3729 line (R2) is not available.
The calibration...
On the Nature of the HII Regions in the Extended Ultraviolet Disc of NGC 4625
galaxies abundances galaxies structure galaxies ISM galaxies individual NGC 4625
2010/11/12
Using deep Subaru/FOCAS spectra of 34 Hii regions in both the inner and outer parts of the extended ultraviolet (XUV) disc galaxy NGC 4625 we have measured an abundance gradient out to almost 2.5 time...
Vector Magnetic Fields and Current Helicities in Coronal Holes and Quiet Regions
Sun activity — Sun magnetic fields — Sun photosphere
2010/11/10
In the solar photosphere, many properties of coronal holes (CHs) are notknown, especially vector magnetic fields. Using observations from Hinode, we investigate vector magnetic fields, current densiti...
Modeling the ionizing spectra of H ii regions: individual stars versus stellar ensembles
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/5
We study how IMF sampling affects the ionizing flux and emission line spectra of low mass stellar clusters.
Deuterated species in extragalactic star-forming regions
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/5
We present a theoretical study of the deuterated species detectability in various types of extragalactic star-forming regions based on our predictions of chemical abundances. This work is motivated by...