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Possibile pianeta extragalattico in M51
2021grande come Saturno. Orbita ogni 70 anni attorno a una binaria X a 28 milioni di anni luce da noi, nella Galassia Vortice. Gli indizi della sua esistenza arrivano dalle misure compiute con i telescopi spaziali Chandra e Xmm-Newton per raggi X, e se confermato sarebbe il primo pianeta mai scoperto al di fuori della nostra ...
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2008
The controversy surrounding the delineation of molecular spiral structure in the Galaxy emphasizes that spiral structure can best be understood by observing external galaxies with high angular resolution. M51, the galaxy in which spiral structure was first discerned, is the obvious galaxy to observe. Lo et al.
Vogel, S. N. +3 more
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The controversy surrounding the delineation of molecular spiral structure in the Galaxy emphasizes that spiral structure can best be understood by observing external galaxies with high angular resolution. M51, the galaxy in which spiral structure was first discerned, is the obvious galaxy to observe. Lo et al.
Vogel, S. N. +3 more
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2023
The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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1990
M51 enjoys a special place in the history of observational astronomy. It was the first galaxy observed to have spiral structure, by Lord Rosse in 1845 using the 72-inch reflector at Burr Castle. Over a century later, M51 became the first galaxy outside the Local Group to be mapped extensively at radio wavelengths by Mathewson, van der Kruit, and Brouw [
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M51 enjoys a special place in the history of observational astronomy. It was the first galaxy observed to have spiral structure, by Lord Rosse in 1845 using the 72-inch reflector at Burr Castle. Over a century later, M51 became the first galaxy outside the Local Group to be mapped extensively at radio wavelengths by Mathewson, van der Kruit, and Brouw [
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Molecular Spiral Structure in M51
1990We present a mosaic map of M51 in the 12CO 1→0 line made with the Owens Valley mm-interferometer. The molecular arms we see are narrow and show an offset relative to the Ha emission. They also show coincidence with the dust lanes. Several interarm emission regions have also been detected, but with very little accompanying Ha emission.
Rand, R. J., Kulkarni, S. R.
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The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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