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Hickson Compact Group 44

Counting   Galaxies   in   Hickson   Compact   Group   44 (Arp 316) – Interacting Galaxies Arp   316   is   in   the   Galaxy   Groups   class.   This   group, including   NGC   3185,   is   also   known   as   Hickson   44. Hickson      44      (Arp      316),      galaxy      group      in constellation   of   the   Lion   (   Leo),   with   NGC   3185 (Sba),   NGC   3187   (SBc/P),   NGC   3190   (Sa),   and   NGC 3193 (E2). Near   J2000   RA   10   18   00,   Dec   +21   48   44;   for   more information click on the galaxy names:   Scanning     the     skies     for     galaxies,     Canadian astronomer      Paul      Hickson      and      colleagues identified   some   100   compact   groups   of   galaxies, now     appropriately     called     Hickson     Compact Groups.   The   four   prominent   galaxies   seen   in   this intriguing   image   are   one   such   group,   Hickson   44, about   100   million   light-years   distant   toward   the constellation   Leo.   The   two   spiral   galaxies   in   the center   of   the   image   are   edge-on   NGC   3190   with its   distinctive,   warped   dust   lanes,   and   S-shaped NGC   3187.      Along   with   the   bright   elliptical,   NGC 3193   at   the   bottom   left,   they   are   also   known   as Arp   316.   The   spiral   in   the   upper   right   corner   is NGC    3185,    the    4th    member    of    the    Hickson group.    Like    other    galaxies    in    Hickson    groups, these    show    signs    of    distortion    and    enhanced star   formation,   evidence   of   a   gravitational   tug   of war   that   will   eventually   result   in   galaxy   mergers on    a    cosmic    timescale.    The    merger    process    is now    understood    to    be    a    normal    part    of    the evolution    of    galaxies,    including    our    own    Milky Way.   For   scale,   NGC   3190   is   about   75,000   light- years     across     at     the     estimated     distance     of Hickson 44.   FCurrent      theory      is      that      compact      groups represent   physically   related   galaxies   that   are   in the   process   of   merging   into   a   single   object,   most likely    an    elliptical    galaxy.    Compact    groups    are relatively     short-lived     entities     that     form     via mergers   of   galaxies   within   loose   subsystems   and groupings.   Simulations   predict   that   merging   of the     group     members     should     proceed     rapidly within    one    billion    years    to    form    an    elliptical galaxy.   Hickson   groups   are   therefore   snapshots at   various   stages   in   this   merging   process.   The more    evolved    groups    are    smaller    and    more deficient    in    neutral    hydrogen    while    the    least evolved     resemble     galaxies     in     looser     groups. Observational   evidence   shows   that   interaction   is occurring   in   a   large   fraction   of   galaxies   in   HCG supporting     this     model     for     the     origin     and evolution   of   HCG.   The   cosmological   implications of   compact   groups   are   significant.   Astronomers believe    they    may    represent    an    intermediate stage     between     loose     groups     and     individual galaxies.   A   better   understanding   of   the   nature   of HCG   could   help   explain   galaxy   formation   on   a larger scale in the early universe.

Counting Galaxies in Hickson Compact Group 44 (Arp 316)

Place:        Àger-Lleida-Spain SQM:         21.7 Average Dates:       From November 2016 till january 2017 Details Telescope:  RC 400 CFF Telescopes 3200 mm f/8 Mount:        ASA DDM85 Camera:      Moravian G3-11000 Exposure nebula Surrounding:                                                      Processing:  Pixinsight Cs6, MaximDL, Photoshop Software:      Pixinsight, CcdStack, Sequence ASA. Control Remote:  Talon6 ROR

Nebula

& Dust
   L:  10 h bin1  RGB: 19 h bin 2  

Counting Galaxies in Hickson Compact Group 44 (Arp 316)

Interacting Galaxies