MSGID: 1:317/3 63d4a4ee   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    Starry tail tells the tale of dwarf galaxy evolution    
      
     Date:   
         January 27, 2023   
     Source:   
         National Institutes of Natural Sciences   
     Summary:   
         A giant diffuse tail of stars has been discovered emanating from   
         a large, faint dwarf galaxy. The presence of a tail indicates   
         that the galaxy has experienced recent interaction with another   
         galaxy. This is an important clue for understanding how so called   
         'ultra-diffuse' galaxies are formed.   
      
      
         Facebook Twitter Pinterest LinkedIN Email   
   FULL STORY   
   ==========================================================================   
   A giant diffuse tail of stars has been discovered emanating from a large,   
   faint dwarf galaxy. The presence of a tail indicates that the galaxy has   
   experienced recent interaction with another galaxy. This is an important   
   clue for understanding how so called "ultra-diffuse" galaxies are formed.   
      
      
   ==========================================================================   
   Astronomers using the Subaru Telescope and the Canada-France-Hawaii   
   Telescope found a tail of stars stretching 200,000 light-years out   
   away from a galaxy known as F8D1. This galaxy is a member of the M81   
   group located 12 million light-years away on the boundary between the   
   constellations Ursa Major and Camelopardalis. F8D1 is one of the closest   
   examples of an "ultra-diffuse" galaxy. The origin of these enigmatic   
   galaxies has puzzled astronomers for several decades: are they born   
   this diffuse or does some later event cause them to puff up in size?   
   The discovery of a huge tidal tail from F8D1 is compelling evidence   
   that the galaxy has been strongly shaped by events in the past billion   
   years. This is the first time that such a stellar stream has been   
   discovered in a UDG. The team suggests F8D1 was disrupted by a recent   
   close passage to the massive spiral M81, the dominant member of the   
   group containing F8D1.   
      
   Since F8D1 lies at the edge of the survey area, only one tidal arm can   
   be seen, extending to the northeast. The team will now search to see if   
   there is a counterpart stream to the southwest.   
      
       * RELATED_TOPICS   
             o Space_&_Time   
                   # Galaxies # Astrophysics # Astronomy # Stars #   
                   Space_Telescopes # Nebulae # Cosmology   
       * RELATED_TERMS   
             o Globular_cluster o Barred_spiral_galaxy o Magellanic_Clouds   
             o Planetary_nebula o Local_Group o Galaxy o Andromeda_Galaxy   
             o Milky_Way   
      
   ==========================================================================   
   Story Source: Materials provided by   
   National_Institutes_of_Natural_Sciences. Note: Content may be edited   
   for style and length.   
      
      
   ==========================================================================   
   Journal Reference:   
      1. Rokas Žemaitis, Annette M N Ferguson, Sakurako Okamoto,   
      Jean-Charles   
         Cuillandre, Connor J Stone, Nobuo Arimoto, Mike J Irwin. A tale   
         of a tail: a tidally disrupting ultra-diffuse galaxy in the M81   
         group. Monthly Notices of the Royal Astronomical Society, 2023;   
         518 (2): 2497 DOI: 10.1093/mnras/stac3133   
   ==========================================================================   
      
   Link to news story:   
   https://www.sciencedaily.com/releases/2023/01/230127131205.htm   
      
   --- up 47 weeks, 4 days, 10 hours, 50 minutes   
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (1:317/3)   
   SEEN-BY: 15/0 106/201 114/705 123/120 153/7715 226/30 227/114 229/110   
   SEEN-BY: 229/111 112 113 114 307 317 400 426 428 470 664 700 292/854   
   SEEN-BY: 298/25 305/3 317/3 320/219 396/45   
   PATH: 317/3 229/426