NGC 3593
{{Short description|Galaxy in the constellation Leo}}
{{Infobox Galaxy
| name = NGC 3593
| image = Ngc3593.jpg
| image_size = 250px
| caption = An infrared Hubble Space Telescope (HST) image of NGC 3593.
| epoch = J2000
| constellation name = Leo
| dist_ly = {{nowrap|20.5 Mly (6.28 Mpc)}}
| z = 627 km/s
| h_radial_v =
| size_v = {{nowrap|1′.5 × 1′.1}}
| notes =
}}
NGC 3593 is a lenticular galaxy located in the constellation Leo. It has a morphological classification of SA(s)0/a, which indicates it is a lenticular galaxy of the pure spiral type. Despite this, it has a large amount of hydrogen, both in its molecular ({{chem|H|2}}) and atomic (H) form. It is a starburst galaxy, which means it is forming new stars at a high rate. This is occurring in a band of gas surrounding the central nucleus. There is a single arm, which spirals outward from this ring. It is frequently but not consistently identified as a member of the Leo Triplet group.{{cite web|url=http://www.messier.seds.org/more/m066gr.html|title=The Leo Triplett (M66 group)|last=McArthur|first=Hartmut Frommert, Christine Kronberg, Guy|website=www.messier.seds.org|access-date=2017-12-22}}
This galaxy is known to contain two counter-rotating populations of stars—that is, one set of stars is rotating in the opposite direction with respect to the other. One means for this to occur is by acquiring gas from an external source, which then undergoes star formation. An alternative is by a merger with a second galaxy. Neither scenario has been ruled out. The age of the lower mass, counter-rotating population is younger by about {{nowrap|1.6 ± 0.8 Gyr}} than the primary star population of the galaxy.
A dynamical study found that there is likely a supermassive black hole (SMBH) at the center of NGC 3593. The mass of the SMBH is between {{val|3.0e5}} and {{val|4.3e6}} solar masses.
References
{{reflist|refs=
| title=NASA/IPAC Extragalactic Database
| work=Results for NGC 3593
| url=http://nedwww.ipac.caltech.edu/
| access-date=2007-04-15
}}
| first1 = Ronald J.
| last1 = Buta
| first2 = Harold G.
| last2 = Corwin
| first3 = Stephen C.
| last3 = Odewahn
| display-authors = 1
| title = Atlas of Galaxies
| publisher = Cambridge University Press
| pages = 13–17
| year = 2007
| isbn = 978-0521820486
| url = https://books.google.com/books?id=g-P7dCbB5MEC&pg=PA16
| postscript= .
}}
| last1 = Crook | first1 = Aidan C.
| last2 = Huchra | first2 = John P.
| last3 = Martimbeau | first3 = Nathalie
| last4 = Masters | first4 = Karen L.
| last5 = Jarrett | first5 = Tom
| last6 = Macri | first6 = Lucas M.
| display-authors = 1
| title = Groups of Galaxies in the Two Micron All Sky Redshift Survey
| journal = The Astrophysical Journal
| volume = 655
| issue = 2
| pages = 790–813
|date=February 2007
| doi = 10.1086/510201
| bibcode = 2007ApJ...655..790C
| arxiv = astro-ph/0610732
| s2cid = 11672751
| postscript = .
}}
| last1 = Coccato | first1 = L.
| last2 = Morelli | first2 = L.
| last3 = Pizzella | first3 = A.
| last4 = Corsini | first4 = E. M.
| last5 = Buson | first5 = L. M.
| last6 = Dalla Bontà | first6 = E.
| display-authors = 1
| title = Spectroscopic evidence of distinct stellar populations in the counter-rotating stellar disks of NGC 3593 and NGC 4550
| journal = Astronomy & Astrophysics
| volume = 549
| page = A3
|date=January 2013
| doi = 10.1051/0004-6361/201220460
| bibcode = 2013A&A...549A...3C
| arxiv = 1210.7807
| s2cid = 55949435
| postscript = .
}}
}}
External links
{{commonscat}}
- [http://hubblesite.org/newscenter/archive/releases/1999/10/image/c HubbleSite NewsCenter: Pictures and description on NGC 3593]
{{Ngc40|state=collapsed}}