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2023-07-12
2023年07月12日:螺旋星系NGC 1398的环与棒-(Rings and Bar of Spiral Galaxy NGC 1398)
2023年07月12日:螺旋星系NGC 1398的环与棒-(Rings and Bar of Spiral Galaxy NGC 1398)--原图下载{mtitle title="螺旋星系NGC 1398的环与棒"/}Image Credit: Mark Hanson;Data: Mike Selby说明: 为何有些螺旋星系有拱心环呢?这幅主题深空影像,无比清晰的解析了宏伟的螺旋星系NGC 1398。在影像里,螺旋星系NGC 1398的中心,不但有个珍珠环状的恒星、气体和尘埃,还有一道横亘过中心的恒星和气体长棒,而较外围的旋臂也形似缎带。NGC 1398的距离大约有6千5百万光年远,也就是说我们现在所见到的光,大约在恐龙正从地球消失时,就从这个星系出发。这个位在天炉座方向、用小望远镜即可见的美丽星系,核心附近的内环构造,可能是恒星诞生活动造成的扩张密度波,触发源则可能是此星系和另一个星系近距离接近的重力互扰,或者是由于它本身的重力不对称。{lamp/}原文:{mtitle title="Rings and Bar of Spiral Galaxy NGC 1398"/}Image Credit: Mark Hanson;Data: Mike SelbyExplanation: Why do some spiral galaxies have a ring around the center?Spiral galaxy NGC 1398 not only has a ring of pearly stars, gas and dust around its center, but a bar of stars and gas across its center, and spiral arms that appear like ribbons farther out. The featured deep image from Observatorio El Sauce in Chile shows the grand spiral galaxy in impressive detail.NGC 1398 lies about 65 million light years distant, meaning the light we see today left this galaxy when dinosaurs were disappearing from the Earth. The photogenic galaxy is visible with a small telescope toward the constellation of the Furnace (Fornax).The ring near the center is likely an expanding density wave of star formation, caused either by a gravitational encounter with another galaxy, or by the galaxy's own gravitational asymmetries.
2023年07月12日
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2022-10-16
2022年10月16日:棒旋星系NGC 1300-(Barred Spiral Galaxy NGC 1300)
2022年10月16日:棒旋星系NGC 1300-(Barred Spiral Galaxy NGC 1300)--原图下载{mtitle title="棒旋星系NGC 1300"/}Image Credit: NASAESA,Hubble Heritage说明: 这个螺旋星系有核心棒,核心棒的中心有个小螺旋,而螺旋的中心则藏着一颗超大质量黑洞。上述的这些特徵,全都出现在波江座方向,离我们约7千万光年远的庞大美丽棒旋星系NGC 1300里。 此外,呈现这个壮丽宇宙岛的此幅哈伯太空望远镜组合影像,更是哈伯望远镜完整星系影像中最细緻的数幅之一。这幅以跨幅超过100,000光年的NGC 1300为主题之哈伯望远镜影像,极为清晰的呈现了它大型的核心棒及壮丽的螺旋臂。至于这个庞大的核心棒是如何形成、维持及影响它的恒星诞生,至今仍是活跃的研究课题。{lamp/}原文:{mtitle title="Barred Spiral Galaxy NGC 1300"/}Image Credit: NASAESA,Hubble HeritageExplanation: Across the center of this spiral galaxy is a bar. And at the center of this bar is smaller spiral. And at the center of that spiral is a supermassive black hole. This all happens in the big, beautiful, barred spiral galaxy cataloged as NGC 1300, a galaxy that lies some 70 million light-years away toward the constellation of the river Eridanus.This Hubble Space Telescope composite view of the gorgeous island universe is one of the most detailed Hubble images ever made of a complete galaxy. NGC 1300 spans over 100,000 light-years and the Hubble image reveals striking details of the galaxy's dominant central bar and majestic spiral arms.How the giant bar formed, how it remains, and how it affects star formation remains an active topic of research.
2022年10月16日
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2019-05-29
2019年05月29日:M95:有内环的螺旋星系-(M95: Spiral Galaxy with an Inner Ring)
2019年05月29日:M95:有内环的螺旋星系-(M95: Spiral Galaxy with an Inner Ring)--原图下载{mtitle title="M95:有内环的螺旋星系"/}Image Credit: NASA, ESA, Hubble, ESO, Amateur Data; Processing & Copyright: Robert Gendler & Roberto Colombari说明: 为何有些螺旋星系核心的围围有一道拱心环呢?最经典的範例是邻近的星系M95,一个大又美丽的棒旋星系。在上面这幅整合哈伯与数部地面望远镜数据的影像里,可见到蔓延的螺旋臂、上头由明亮泛蓝恒星聚成的疏散星团、黝黑的尘埃带、数十亿暗星发出的弥漫辉光、以及横贯星系核心的短短核心棒。不过,最让天文学家好奇的,是位在核心棒外头,环绕星系核心的拱心环。虽然这道拱心环的长期稳定性,仍然是研究的题材,但观测显示它目前的亮度,至少是受到一波波短暂的恒星形成活动之加强。又名为NGC 3351的M95,大小在50,000光年左右,用小望远镜即可在狮子座方向见到它。{lamp/}原文:{mtitle title="M95: Spiral Galaxy with an Inner Ring"/}Image Credit: NASA, ESA, Hubble, ESO, Amateur Data; Processing & Copyright: Robert Gendler & Roberto ColombariExplanation: Why do some spiral galaxies have a ring around the center? First and foremost, M95 is one of the closer examples of a big and beautiful barred spiral galaxy. Visible in the featured combination of images from Hubble and several ground based telescopes are sprawling spiral arms delineated by open clusters of bright blue stars, lanes of dark dust, the diffuse glow of billions of faint stars, and a short bar across the galaxy center. What intrigues many astronomers, however, is the circumnuclear ring around the galaxy center visible just outside the central bar. Although the long term stability of this ring remains a topic of research, observations indicate its present brightness is at least enhanced by transient bursts of star formation. M95, also known as NGC 3351, spans about 50,000 light-years, lies about 30 million light years away, and can be seen with a small telescope toward the constellation of the Lion (Leo).
2019年05月29日
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2018-01-23
2018年01月23日:螺旋星系NGC 1398的缎带与珍珠-(Ribbons and Pearls of Spiral Galaxy NGC 1398)
2018年01月23日:螺旋星系NGC 1398的缎带与珍珠-(Ribbons and Pearls of Spiral Galaxy NGC 1398)--原图下载{mtitle title="螺旋星系NGC 1398的缎带与珍珠"/}Image Credit: European Southern Observatory说明: 为什么有些螺旋星系有拱心环呢?螺旋星系NGC 1398的中心,不但有一圈珍珠状的恒星、气体和尘埃,还有一道横亘过中心的恒星和气体长棒,而较外围的旋臂也形似缎带。这幅由位在智利的欧南天文台.帕连那天文台的极大望远镜拍摄之主题影像,无比清晰的解析了这个宏伟的螺旋星系。NGC 1398的距离大约有6千5百万光年远,也就是说我们现在见到的光,大约在恐龙正从地球消失时,就离开了这个星系。这个位在天炉座方向,用小望远镜就得见的美丽星系,核心附近的环状构造,可能是恒星诞生活动造成的扩张密度波,触发源可能是此星系和另一个星系近距离重力接近,或者是由于它本身的重力不对称。{lamp/}原文:{mtitle title="Ribbons and Pearls of Spiral Galaxy NGC 1398"/}Image Credit: European Southern ObservatoryExplanation: Why do some spiral galaxies have a ring around the center?Spiral galaxy NGC 1398 not only has a ring of pearly stars, gas and dust around its center, but a bar of stars and gas across its center, and spiral arms that appear like ribbons farther out. The featured image was taken with ESO's Very Large Telescope at the Paranal Observatory in Chile and resolves this grand spiral in impressive detail.NGC 1398 lies about 65 million light years distant, meaning the light we see today left this galaxy when dinosaurs were disappearing from the Earth. The photogenic galaxy is visible with a small telescope toward the constellation of the Furnace (Fornax).The ring near the center is likely an expanding density wave of star formation, caused either by a gravitational encounter with another galaxy, or by the galaxy's own gravitational asymmetries.
2018年01月23日
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2003-04-13
2003年04月13日:NGC 1365: 一个临近的棒漩星系-(NGC 1365: A Nearby Barred Spiral Galaxy)
2003年04月13日:NGC 1365: 一个临近的棒漩星系-(NGC 1365: A Nearby Barred Spiral Galaxy)--原图下载{mtitle title="NGC 1365: 一个临近的棒漩星系"/}Credit: FORS Team, 8.2-meter VLT Antu, ESO说明: 许多螺旋星系有棒状的中心,甚至连我们的银河系可能也有 这种棒状核心,不过也许没有像上面的 NGC 1365一样突出而已。从棒状核心持续的运动情形,暗示这类星系有相当大质量的漩涡臂。而从蓝色年轻亮星和尘埃带的排列特性,也显示这类星系有很强的迴旋 密度波,因而触发了恒星诞生。NGC 1365是天炉星系群 (Fornax Cluster of Galaxies)的一员,而NGC 1365 相对来说离我们不远,我们能够同时量测它的速度和距离, 所以对协助天文学家估计宇宙的膨胀速率有帮助。{lamp/}原文:{mtitle title="NGC 1365: A Nearby Barred Spiral Galaxy"/}Credit: FORS Team, 8.2-meter VLT Antu, ESOExplanation: Many spiral galaxies have bars across their centers. Even our own Milky Way Galaxy is thought to have a bar, but perhaps not so prominent as the one in NGC 1365, shown above. The persistence and motion of the bar imply relativelymassive spiral arms. The placements of bright young blue stars and dark dust lanes also indicate a strong rotating density wave of star formation. NGC 1365 is a member of theFornax Cluster of Galaxies. Because NGC 1365 is relatively nearby, simultaneous measurements of its speed and distance are possible, which help astronomers estimate how fast our universe is expanding.
2003年04月13日
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2002-11-21
2002年11月21日:星暴增(Starburst) 星系 M94-(Starburst Galaxy M94)
2002年11月21日:星暴增(Starburst) 星系 M94-(Starburst Galaxy M94)--原图下载{mtitle title="星暴增(Starburst) 星系 M94"/}Credit & Copyright: Hillary Mathis & N.A.Sharp (NOAO), AURA, NSF说明: 为什么星系M94的核心会如此明亮呢? 螺旋星系M94的核心周围绕着一环刚诞生的恒星,让星系的外观变得很奇特,同时也让核心发出很强的辉光。现在最可信的触发机制理论认为,星系M94有着由恒星组成的长结,像棒子般不停地转动,产生一个向外扩张的环状星暴增区。 上面这张经过数位增锐的M94影像,涵盖的区域大约有30光年。M94位在北天的猎犬座 (Canes Venatici),距离我们约有一千五百万光年远,用小口径的望远镜就能看见它。{lamp/}原文:{mtitle title="Starburst Galaxy M94"/}Credit & Copyright: Hillary Mathis & N.A.Sharp (NOAO), AURA, NSFExplanation: What could cause the center of M94 to be so bright? Spiral galaxy M94 has a ring of newly formed stars surrounding its nucleus, giving it not only an unusual appearance but also a strong interior glow. A leading progenitor hypothesis holds that an elongated knot of stars known as a bar rotates in M94 and has generated a burst of star formation in the form of an outward moving ring. M94, pictured above digitally sharpened, spans about 30,000 light years, lies about 15 million light years away, and can be seen with a small telescope toward the constellation of Canes Venatici.
2002年11月21日
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