NGC 5523

{{Short description|Galaxy in the constellation of Bootes}} {{Infobox galaxy | name = NGC 5523 | image = File:NGC5523 - SDSS DR14.jpg | caption = [[Sloan Digital Sky Survey|SDSS]] image of NGC 5523 | credit = | epoch = J2000 | constellation name = [[Boötes]] | ra = {{RA|14|14|52.31}}<ref name="SIMBAD"/> | dec = {{DEC|+25|19|3.41}}<ref name="SIMBAD"/> | z = 0.003488<ref name="SIMBAD"/> | h_radial_v = {{nowrap|1044 km/s}}<ref name="SIMBAD"/> | gal_v = {{nowrap|1093 km/s}}<ref name="NASA/IPAC">{{cite web |title=Results for object NGC 5523 |url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=37359&objname=1&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1 |publisher=NASA/IPAC Extragalactic Database |access-date=15 August 2022 |archive-url=https://web.archive.org/web/20220815145427/https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=37359&objname=1&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1 |archive-date=15 August 2022}}</ref> | dist_ly = 49 ± 3 M[[light-year|ly]]<br/>{{nowrap|(15.0 ± 1.0 M[[parsec|pc]])}}<ref name="NASA/IPAC"/> | type = SA(s)cd<ref name=Fulmer/> | appmag_v = 12.75<ref name="NASA/IPAC"/> | absmag_v = -18.1{{refn|group=nb|Calculated from Galactocentric GSR Distance modulus<ref name="NASA/IPAC"/>}} | size_v = 4.6' x 1.3'<ref name="NASA/IPAC"/> | notes = | names = {{odlist|MCG=+04-34-008|PGC=50895|UGC=9119}}<ref name="SIMBAD"/> }}

'''NGC 5523''' is an unbarred [[spiral galaxy]] in the constellation of [[Boötes]], registered in [[New General Catalogue]] (NGC).<ref name="SIMBAD">{{cite web |title=NGC 5523|url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC%205523 |publisher=SIMBAD |access-date=14 August 2022 |archive-url=https://web.archive.org/web/20200722050827/http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC%205523 |archive-date=22 July 2020}}</ref> The galaxy forms an equilateral triangle with [[NGC 5641]] and [[NGC 5466]] when observed using a telescope from the ground.<ref>{{Cite book |last=Gilmour |first=Jess K. |title=The Practical Astronomer's Deep-sky Companion |chapter-url=http://link.springer.com/10.1007/978-1-4471-0071-3_6 |chapter=Bootes |date=2003 |publisher=Springer London |isbn=978-1-85233-474-1 |location=London |pages=16–18 |doi=10.1007/978-1-4471-0071-3_6}}</ref>

==Observation history== NGC 5523 was discovered by [[William Herschel]] on 19 May 1784 using 18.7-inch [[f-number|f/13]] speculum telescope.<ref name="Seligman">{{cite web |last1=Seligman |first1=Courtney |title=NGC 5523 (= PGC 50895) |url=https://cseligman.com/text/atlas/ngc55.htm#5523 |publisher=Seligman website |access-date=14 August 2022}}</ref><ref name="docdb">{{cite web |title=NGC 5523 |url=http://www.docdb.net/show_object.php?id=ngc_5523 |publisher=Deep Sky Observer's Companion – the online database |access-date=14 August 2022 |archive-url=https://web.archive.org/web/20170903015928/http://www.docdb.net/show_object.php?id=ngc_5523 |archive-date=3 September 2017}}</ref> [[John Louis Emil Dreyer]] inside the New General Catalogue, described it as "faint, pretty large, pretty much extended 90°, 10th magnitude star to northwest".<ref name="Seligman"/> It was described in [[Robert Burnham Jr.|Burnham's Celestial Handbook]] as "faint, pretty large (5.0'x0.8'), much elongated, nearly edge-on". Steve Coe, an American astronomer, described it as "faint, pretty large, much elongated (3 X 1) in PA 90 and brighter in the middle at 100X."<ref name="docdb"/>

==General== The galaxy was originally thought to be isolated due to its lack of interaction with other galaxies in the past 1 to 3 [[billion years]]. However, a 2016 study reported that some irregularities of the contour of the discs and nucleated bulge at the center of the galaxy suggested that the galaxy previously had soft collisions with other galaxies.<ref name=Fulmer>{{Cite journal |arxiv=1611.05968 |last1=Fulmer |first1=Leah M |last2=Gallagher III |first2=John S. |last3=Kotulla |first3=Ralf |title=NGC 5523: An isolated product of soft galaxy mergers? |journal=Astronomy & Astrophysics |year=2017|volume=598 |pages=A119 |doi=10.1051/0004-6361/201628070 |bibcode=2017A&A...598A.119F |s2cid=119217039 }}</ref>

==Notes== {{reflist|group=nb}}

==References== {{reflist}}

[[Category:Galaxies discovered in 1784]] [[Category:NGC objects|5523]] [[Category:Astronomical objects discovered in 1784|17900519]] [[Category:Unbarred spiral galaxies]] [[Category:Boötes|NGC 5523]] [[Category:Discoveries by William Herschel]]