NASA의 웹 우주 망원경은 우주 독거미를 포착합니다.
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NASA의 웹 우주 망원경은 우주 독거미를 포착합니다.

근적외선 웹 카메라(NIRCam)는 340광년에 걸쳐 이 모자이크 이미지를 캡처했습니다. 이전에 우주 먼지로 둘러싸여 있던 이전에 본 적이 없는 수만 개의 어린 별을 포함하여 독거미 성운의 별 생성 영역을 새로운 시각으로 보여줍니다. 가장 활동적인 영역은 옅은 파란색으로 보이며 거대한 어린 별들로 반짝이는 것처럼 보입니다. 그리고 그들 사이에는 여전히 묻힌 별들이 흩어져 있으며, 붉게 보이지만 아직 먼지가 많은 성운의 고치에서 나오지는 않습니다. NIRCam은 근적외선 파장에서 전례 없는 정확도 덕분에 먼지로 뒤덮인 별을 감지할 수 있습니다.
성운의 공동 상단, 젊은 성단의 왼쪽 상단에는 망원경 구조의 인공물인 NIRCam의 8가지 특징적인 회절 스파이크인 더 오래된 별이 눈에 띄게 보입니다. 이 별의 상단 중심이 위로 상승한 후, 대략 구름에 뚜렷한 거품을 표시합니다. 먼지가 많은 물질로 둘러싸여 있는 어린 별들은 이 거품을 부풀려 자체 공동을 만들기 시작합니다. 천문학자들은 두 개의 Webb 분광기를 사용하여 이 지역을 자세히 살펴보고 별과 주변 가스의 화학적 조성을 결정했습니다. 이 스펙트럼 정보는 성운의 나이와 성운이 본 별 탄생 세대 수에 대해 천문학자들에게 알려줍니다.
뜨겁고 젊은 별의 핵심 영역에서 멀리 떨어진 차가운 가스는 녹슬어 성운에 복잡한 탄화수소가 풍부하다는 것을 천문학자들에게 보여줍니다. 이 밀도가 높은 가스는 미래의 별을 형성할 물질입니다. 무거운 별에서 오는 바람이 가스와 먼지를 쓸어 버릴 때 일부는 축적되어 중력의 도움으로 새로운 별을 형성합니다.
NIRCam은 애리조나 대학과 록히드 마틴의 첨단 기술 센터 팀에 의해 구축되었습니다.
크레딧: NASA, ESA, CSA, STScI, Webb ERO 프로덕션 팀

별 탄생에 대한 새로운 이야기가 펼쳐진다

James Webb Space Telescope presents a new perspective on the Tarantula Nebula, or 30 Doradus, a region well-known to astronomers studying star formation. Its nickname originated from its resemblance to the spider itself. However, in Webb’s view, the overall region takes on the appearance of a tarantula’s home—a burrow lined with its own spun silk. The Tarantula Nebula shelters thousands of young and still-forming stars, many revealed by Webb for the first time.

Working together, a range of Webb’s high-resolution infrared instruments reveal the stars, structure, and composition of the nebula with a level of detail not previously possible. Astronomers will use Webb throughout its mission to gain insight into star formation and the stellar lifecycle. The implications of this extend to our own star, the Sun, as well as the formation of the heavy chemical elements that are essential to life as we know it.

Tarantula Nebula (MIRI)

At the longer wavelengths of light captured by its Mid-Infrared Instrument (MIRI), Webb focuses on the area surrounding the central star cluster and unveils a very different view of the Tarantula Nebula. In this light, glowing gas and dust come forward as the young hot stars of the cluster fade in brilliance. Abundant hydrocarbons light up the surfaces of the dust clouds, shown in blue and purple. Much of the nebula takes on a more ghostly, diffuse appearance because mid-infrared light is able to show more of what is happening deeper inside the clouds. Still-embedded protostars pop into view within their dusty cocoons, including a bright group at the very top edge of the image, left of center.
Other areas appear dark, like in the lower-right corner of the image. This indicates the densest areas of dust in the nebula, that even mid-infrared wavelengths cannot penetrate. These could be the sites of future, or current, star formation.
MIRI was contributed by ESA and NASA, with the instrument designed and built by a consortium of nationally funded European Institutes (The MIRI European Consortium) in partnership with JPL and the University of Arizona.
Credit: NASA, ESA, CSA, STScI, Webb ERO Production Team

A Cosmic Tarantula, Caught by NASA’s Webb Space Telescope

Once upon a space-time, a cosmic creation story unfolded: Thousands of never-before-seen young stars were spotted in a stellar nursery called 30 Doradus, captured by NASA’s James Webb Space Telescope. Nicknamed the Tarantula Nebula for the appearance of its dusty filaments in previous telescope images, the nebula has long been a favorite for astronomers studying star formation. In addition to young stars, Webb reveals distant background galaxies, as well as the detailed structure and composition of the nebula’s gas and dust.

Located just 161,000 light-years away in the Large Magellanic Cloud galaxy, the Tarantula Nebula is the largest and brightest star-forming region in the Local Group, the galaxies nearest our Milky Way. It is home to the hottest, most massive stars known to astronomers. Three of Webb’s high-resolution infrared instruments were focused on the Tarantula. Viewed with Webb’s Near-Infrared Camera (NIRCam), the region resembles a burrowing tarantula’s home, lined with its silk. The nebula’s cavity centered in the NIRCam image has been hollowed out by blistering radiation from a cluster of massive young stars, which sparkle pale blue in the image. Only the densest surrounding areas of the nebula resist erosion by these stars’ powerful stellar winds, forming pillars that appear to point back toward the cluster. These pillars contain forming protostars, which will eventually emerge from their dusty cocoons and take their turn shaping the nebula.

Tarantula Nebula (NIRSpec IFU)

Webb’s Near-Infrared Spectrograph (NIRSpec) reveals what is really going on in a fascinating region of the Tarantula Nebula. Scientists focused the powerful instrument on what looked like a small bubble feature in the image from Webb’s Near-Infrared Camera (NIRCam). However, the spectra reveal a very different picture from a young star blowing a bubble in its surrounding gas.
The signature of atomic hydrogen, shown in blue, shows up in the star itself but not immediately surrounding it. Instead, it appears outside the “bubble,” which spectra show is actually “filled” with molecular hydrogen (green) and complex hydrocarbons (red). This is an indication that the bubble is actually the top of a dense pillar of dust and gas that is being blasted by radiation from the cluster of massive young stars to its lower right (see the full NIRCam image). It does not appear as pillar-like as some other structures in the nebula because there is not much color contrast with the area surrounding it.
The harsh stellar wind from the massive young stars in the nebula is breaking apart molecules outside the pillar, but inside they are preserved, forming a cozy cocoon for the star. This star is still too young to be clearing out its surroundings by blowing bubbles – NIRSpec has captured it just beginning to emerge from the protective cloud from which it was formed. Without Webb’s resolution at infrared wavelengths, the discovery of this star birth in action would not have been possible.
NIRSpec was built for the European Space Agency (ESA) by a consortium of European companies led by Airbus Defence and Space (ADS) with NASA’s Goddard Space Flight Center providing its detector and micro-shutter subsystems.
Credit: NASA, ESA, CSA, STScI, Webb ERO Production Team

Webb’s Near-Infrared Spectrograph (NIRSpec) caught one very young star doing just that. Astronomers previously thought this star might be a bit older and already in the process of clearing out a bubble around itself. However, NIRSpec showed that the star was only just beginning to emerge from its pillar and still maintained an insulating cloud of dust around itself. This episode of star formation-in-action could not have been revealed, without Webb’s high-resolution spectra at infrared wavelengths.

When viewed in the longer infrared wavelengths detected by Webb’s Mid-infrared Instrument (MIRI), the region takes on a different appearance. The hot stars fade, and the cooler gas and dust glow. Within the stellar nursery clouds, points of light indicate embedded protostars, still gaining mass. While shorter wavelengths of light are absorbed or scattered by dust grains in the nebula, and therefore never reach Webb to be detected, longer mid-infrared wavelengths penetrate that dust, ultimately revealing a previously unseen cosmic environment.

One of the reasons the Tarantula Nebula is interesting to astronomers is that the nebula has a similar type of chemical composition as the gigantic star-forming regions observed at the universe’s “cosmic noon.” This was when the cosmos was only a few billion years old and star formation was at its peak. Star-forming regions in our Milky Way galaxy are not producing stars at the same furious rate as the Tarantula Nebula, and have a different chemical composition. This makes the Tarantula the closest (i.e., easiest to see in detail) example of what was happening in the universe as it reached its brilliant high noon. Webb will provide astronomers the opportunity to compare and contrast observations of star formation in the Tarantula Nebula with the telescope’s deep observations of distant galaxies from the actual era of cosmic noon.

Despite humanity’s thousands of years of stargazing, the star-formation process still holds many mysteries. Many of them are due to our previous inability to get crisp images of what was happening behind the thick clouds of stellar nurseries. Webb has already begun revealing a universe never seen before, and it is only getting started on rewriting the stellar creation story.

The James Webb Space Telescope is the world’s premier space science observatory. Webb will solve mysteries in our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and the Canadian Space Agency.

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