Más sobre resultados de IMaX/SUNRISE (El Mundo)

El telescopio solar Sunrise ha desvelado una "inesperada" actividad en el Sol, según los primeros resultados de esta misión publicados en doce artículos en la revista The Astrophysical Journal Letters.
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Primeros resultados de IMaX/SUNRISE (El País)

Cuando hace ya más de ocho años comenzamos a pergeñar lo que sería el magnetógrafo solar IMaX (siglas del nombre inglés Imaging Magnetograph eXperiment), todo era anhelo, ilusión, emoción y ambiciones. Un equipo de científicos e ingenieros de cinco instituciones españolas (el Instituto de Astrofísica de Canarias, el Instituto de Astrofísica de Andalucía, el Instituto Nacional de Técnica Aeroespacial, la Universidad de Valencia y la Universidad Politécnica de Madrid) comenzábamos una larga andadura en común.
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V1 non-linearities emerge from local-to-global non-linear ICA

It has been argued that the aim of non-linearities in different visual and auditory mechanisms may be to remove the relations between the coefficients of the signal after global linear ICA-like stages. Specifically, in [Schwartz and Simoncelli 01], it was shown that masking effects are reproduced by fitting the parameters of a particular non-linearity in order to remove the dependencies between the energy of wavelet coefficients.

Coded Masks

The Coded Mask Thing

X-rays are composed by high energy photons. It's difficult to get this photons to interact with matter in a way that they can be focused as we do with optical bands photons. Therefore, we need to use some trick to get our high energy images.

INTEGRAL long-term monitoring of the Supergiant Fast X-ray Transient XTE J1739-302

 In the past few years, a new class of High Mass X-Ray Binaries (HMXRB)
 has been claimed to exist, the Supergiant Fast X-ray Transients (SFXT).
 These are X-ray binary systems with a compact companion orbiting a
 supergiant star which show very short and bright outbursts in a series
 of activity periods overimposed on longer quiescent periods. Only very
 recently the first attempts to model the behaviour of these sources have
 been published, some of them within the framework of accretion from clumpy

Sunday, 1 Jun 2008

Very peculiar wind from BD+53 2790, the optical counterpart to 4U 2206+54

BD+53 2790, an O9.5Vp star, is the optical counterpart to the HMXRB
 4U 2206+54. This system was classified initially as a BeX, but
 observational evidence soon stressed the need to revise this classification.
 The permanent asymmetry in the H-alpha line profiles (in contrast with
 the cyclic variations shown by Be stars), the variations in the profile
 of this line in time scales of hours (while time scales from weeks to
 months are expected in Be stars), and the lack of correlation between

Sunday, 1 Jun 2008

Discovery of slow X-ray pulsations in the high-mass X-ray binary 4U 2206+54

The source 4U 2206+54 is one of the most enigmatic high-mass X-ray binaries.
In spite of intensive searches, X-ray pulsations have not been detected in
the time range 0.001-1000 s. A cyclotron line at ~30 keV has been suggested
by various authors but never detected with significance. The stellar wind
of the optical companion is abnormally slow. The orbital period, initially
reported to be 9.6 days, disappeared and a new periodicity of 19.25 days
emerged. Our new long and uninterrupted RXTE observations allow us to search

Thursday, 1 Jan 2009

Correlated optical/X-ray variability in the high-mass X-ray binary SAX J2103.5+4545

SAX J2103.5+4545 is the Be/X-ray binary with the shortest orbital period.
It shows extended bright and faint X-ray states that last for a few hundred
days. The main objective of this work is to investigate the relationship
between the X-ray and optical variability and to characterise the spectral
and timing properties of the bright and faint states. We have found a
correlation between the spectral and temporal parameters that fit the
energy and power spectra. Softer energy spectra correspond to softer power

Thursday, 1 Jan 2009


MXGS stands for Monitor X-ray and Gamma-ray Sensor and it is the high energy sensor in the Atmospheric-Space Interaction Monitor (ASIM). ASIM was proposed for the International Space Station external facilities on the Columbus module,  with the scientific goal of studying high-altitude optical emissions from the stratosphere and mesosphere, the so-called red sprites, blue jets, and elves  (or Transient Luminous Events, TLEs) and to provide evidence on the possible link between these optical emissions and Terrestial Gamma Ray Flashes (TGFs)
See ASIM page at the Danish Space Research Institute (DSRI).

ASIM logo 2
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