arp 105 (ngc 3561 & a)

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  arp 105 is in a spectacular field of galaxies.  it's in the class e and e-like galaxies connected to spirals.  the arp is the long structure running n-s, about halfway from the center of the field to the east edge.  the brighter galaxy to the south is ngc 3561 and the companion, about 1' north, is ngc 3561a.  the little elliptical(?) just south of ngc 3561 is known as ambartsumian's knot.  as you can see, there are quite a few other knots, galaxies, etc., in this structure.  also in the field, ngc 3550 is the bright object toward the northwest corner, just west of the bright star.  there are three more ngc's, 3553, 52, and 54, all in a line starting not quite 4' south of 3550 and angling sse.  ngc 3553 is not particularly bright -- there are a number of brighter galaxies in the field that did not make the better known catalogs.  the entire field is completely inside abell galaxy cluster 1185.

 atlas image

              

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