Tag: Mid-Infrared Instrument

  • Webb Detects Caldwell 69’s Hot Central Star After 200 Years

    Webb Detects Caldwell 69’s Hot Central Star After 200 Years

    Key Takeaways

    1. NGC 6302 is a planetary nebula located 3,400 light-years away in the constellation of Scorpius, resembling butterfly wings with its two lobes.
    2. The Webb telescope’s Mid-Infrared Instrument (MIRI) provided detailed observations, allowing for the first identification of the central star within the nebula.
    3. The central star has a temperature of 220,000 Kelvin, making it one of the hottest known stars in planetary nebulae in the Milky Way.
    4. The dust band obscuring the central star is composed of crystalline silicate and larger dust grains, with jets of iron and nickel detected emanating from the star.
    5. The research combined data from the Webb telescope and the Atacama Large Millimeter/submillimeter Array, aiding in the understanding of polycyclic aromatic hydrocarbons (PAHs) in an oxygen-rich environment.

    NGC 6302 is a planetary nebula found 3400 light-years away in the constellation of Scorpius. Discovered in 1826 by William Herschel with a small telescope, it resembles butterfly wings with its two lobes. In the middle of the nebula, there’s a thick dust band that obscures the view of its central star.

    Advanced Observations

    The Webb telescope utilized its Mid-Infrared Instrument (MIRI) to gain more insights into this intricate center. This observation was conducted in integral field unit mode, which pairs a camera with a spectrograph to capture multiple images across varying wavelengths.

    Discoveries Unveiled

    Thanks to Webb’s observations, the location of the central star within the nebula was pinpointed for the first time ever. This star boasts an impressive temperature of 220,000 Kelvin, ranking it among the hottest known central stars within planetary nebulae in our Milky Way galaxy.

    Dust Band Analysis

    Webb also explored the composition of the dust band that shrouds the central star. It uncovered that this band is made up of crystalline silicate, such as quartz, along with larger dust grains that measure about a millionth of a meter in size.

    The chemical activity beyond the central dust band is quite intriguing too. Webb identified jets of iron and nickel shooting out from the central star in opposing directions. The research team analyzing this data also discovered light emitted from polycyclic aromatic hydrocarbons (PAHs). Finding PAHs in an oxygen-rich planetary nebula will aid scientists in understanding how these molecules form.

    The research team merged Webb’s findings with information from the Atacama Large Millimeter/submillimeter Array to achieve these important discoveries.

    ESA and NASA have both played a role in this groundbreaking research.

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  • ESA Unveils Sharpest Ultra Deep Field Image Ever

    ESA Unveils Sharpest Ultra Deep Field Image Ever

    Key Takeaways

    1. Webb combined data from its NIRCam and MIRI to produce detailed images of the Hubble Ultra Deep Field, showcasing over 10,000 galaxies from early in the Universe’s history.
    2. The MIRI Deep Imaging Survey (MIDIS) involved nearly 100 hours of observation, revealing over 2,500 sources, including many hidden or evolved galaxies.
    3. Infrared wavelengths in the images highlight unique galaxy features, with red and orange indicating dust-rich or high star formation galaxies, and blue and cyan showing brighter galaxies in shorter wavelengths.
    4. Webb’s images provide insights into the characteristics of distant galaxies, influenced by redshift, which shifts their light into the mid-infrared spectrum.
    5. The findings enhance our understanding of galaxy formation and the early Universe, contributing significantly to the fields of astronomy and cosmology.

    Webb has merged data from its Near-Infrared Camera (NIRCam) and Mid-Infrared Instrument (MIRI) to show sharp and detailed images of the Hubble Ultra Deep Field. This field was first created using Hubble’s observations taken between 2003 and 2004 and it displays over 10,000 galaxies, with some of them being from less than a billion years after the Big Bang.

    MIRI Deep Imaging Survey

    The recent observations by Webb concentrated on the MIRI Deep Imaging Survey (MIDIS) area, utilizing MIRI’s shortest-wavelength filter. This observation took almost 100 hours, making it Webb’s longest observation of an extragalactic field through a single filter. In this tiny segment of the sky that was studied, Webb uncovered over 2,500 sources, which includes hundreds of very red galaxies. Many of these are probably large galaxies hidden within cosmic dust or more evolved galaxies containing mature stars that emerged early in the Universe’s existence.

    Infrared Wavelengths and Galaxy Features

    The image used colors based on infrared wavelengths, bringing out unique features of the galaxies. Longer mid-infrared wavelengths are represented by orange and red, pointing out galaxies with characteristics like significant dust, high star formation rates, or active galactic nuclei (AGN). The small greenish-white galaxies seem to be more distant due to redshift, causing their light to shift into the mid-infrared spectrum. Most other galaxies shine the brightest in shorter near-infrared wavelengths, which are depicted as blue and cyan, as they do not have mid-infrared boosts.

    Webb’s perspective on the Hubble Ultra Deep Field is among the most profound views of the Universe ever captured, offering valuable information about how the first cosmic structures came into being.

    Conclusion

    Overall, Webb’s findings enhance our understanding of galaxy formation and the early Universe, making significant contributions to astronomy and cosmology.

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    ESA Unveils Sharpest Ultra Deep Field Image Ever

     

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