Nava spațială XRISM va deschide o nouă fereastră pe Cosmosul cu raze X Imprimare
Marţi, 15 August 2023 17:59
               Against a black background, the gold-foil-covered XRISM spacecraft points directly at the viewer.
  "Viitoarea navă spațială XRISM (X-ray Imaging and Spectroscopy Mission, pronunțat „crism”) va studia cele mai fierbinți regiuni ale universului, cele mai mari structuri și obiecte cu cea mai puternică gravitație. 
   Condus de JAXA (Japan Aerospace Exploration Agency), XRISM va observa aceste extreme cosmice folosind spectroscopie, studiul modului în care lumina și materia interacționează. 
   În acest explicator, producătorul video Sophia Roberts de la Centrul de zbor spațial Goddard al NASA ne prezintă modul în care înțelegerea spectroscopiei ne aprofundează cunoștințele despre univers.
“I think we all get excited for the beautiful images we get from missions like NASA’s James Webb Space Telescope,” Roberts said. “But after taking a deep dive into spectroscopy, I really appreciate the critical context it gives scientists about the story behind those pictures.”

XRISM’s microcalorimeter spectrometer, named Resolve, is a collaboration between JAXA and NASA. It will create spectra, measurements of light’s intensity over a range of energies, for X-rays from 400 to 12,000 electron volts. (For comparison, visible light energies range from about 2 to 3 electron volts.)

To do this, Resolve measures tiny temperature changes created when an X-ray hits its 6-by-6-pixel detector. To measure that minuscule increase and determine the X-ray’s energy, the detector needs to cool down to around minus 460 Fahrenheit (around minus 270 Celsius), just a fraction of a degree above absolute zero. The instrument reaches its operating temperature after a multistage mechanical cooling process inside a refrigerator-sized container of liquid helium.

Resolve will help astronomers learn more about the composition and motion of extremely hot gas within clusters of galaxies, near-light-speed particle jets powered by black holes in active galaxies, and other cosmic mysteries.

The Webb telescope captures similar spectra, but for infrared light. Webb’s spectra have revealed the makeup of gas near active black holes and mapped the movement of this material toward or away from the viewer. Data from XRISM’s Resolve instrument will do the same at higher energies, helping paint a fuller picture of these objects.

 

Scientists studied NGC 7319, part of the visual grouping of galaxies called Stephan’s Quintet, using the Medium-Resolution Spectrometer (MRS) in the Mid-Infrared Instrument (MIRI) on NASA’s James Webb Space Telescope.
The galaxy contains a supermassive black hole that is actively accreting material. The spectrometer features integral field units (IFUs) – each containing a camera and spectrograph. IFUs provided the Webb team with a collection of images of the galactic core’s spectral features, shown here. Blue-colored regions indicate movement toward the viewer and orange-colored regions represent movement away from the viewer. Powerful radiation and winds from the black hole ionize hot spots of super-heated gas, creating the argon and neon lines.
The hydrogen line is from colder dense gas in the central regions of the galaxy and entrained in the outflowing wind. The velocities are measured by shifts in the wavelengths of a given emission line feature.
Credits: NASA, ESA, CSA, STScI

XRISM is a collaborative mission between JAXA and NASA, with participation by ESA (European Space Agency). NASA’s contribution includes science participation from the Canadian Space Agency.

Banner image: This artist's concept shows a face-on view of the XRISM (X-ray Imaging and Spectroscopy Mission) spacecraft. Credit: NASA's Goddard Space Flight Center Conceptual Image Lab"


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NASA’s Goddard Space Flight Center, Greenbelt, Md.

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NASA’s Goddard Space Flight Center, Greenbelt, Md.