View source for NGC 4625

{{Short description|Distorted dwarf spiral galaxy in the constellation Canes Venatici}}
{{Infobox Galaxy
| name = [[New General Catalogue|NGC]] 4625
| image = NGC4625 - HST - Potw1746a.tif
| image_size = 300px
|caption = 
| credit=
| epoch = [[J2000]]
| constellation name = [[Canes Venatici]]<ref name="sinnott1988">{{cite book 
  | editor=R. W. Sinnott
  | title= The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer
  | date=1988
  | publisher=Sky Publishing Corporation and Cambridge University Press
  | isbn=978-0-933346-51-2}}</ref>
| type = SAB(rs)m pec<ref name="ned">{{cite web
  | title=NASA/IPAC Extragalactic Database
  | work=Results for NGC 4625
  | url=http://nedwww.ipac.caltech.edu/
  | access-date=2006-12-07}}</ref>
| ra = {{RA|12|41|52.7}}<ref name="ned" />
| dec = {{DEC|+41|16|26}}<ref name="ned" />
| z = 609 ± 1 km/[[second|s]]<ref name="ned" />
| dist_ly =
| appmag_v = 13.2g<ref name="ned" />
| size_v = 1.3{{prime}} × 1.2{{prime}}<ref name="ned" />
| notes = Asymmetric; Single spiral arm<ref name="carnegieatlas" />
| names = [[Index Catalogue|IC]] 3675,<ref name="ned" /> [[Uppsala General Catalogue|UGC]] 7861,<ref name="ned" /> [[Principal Galaxies Catalogue|PGC]] 42607<ref name="ned" />
}}

'''NGC 4625''' is a distorted [[dwarf galaxy]] in the [[constellation]] [[Canes Venatici]].  The galaxy is formally classified as a [[galaxy morphological classification|Sm]] galaxy, which means that its structure vaguely resembles the structure of [[spiral galaxies]].  The galaxy is sometimes referred to as a [[Magellanic spiral]] because of its resemblance to the [[Large Magellanic Cloud]]'s single-arm structure.

==Structure==
[[File:NGC 4625 I FUV g2006.jpg|thumb|left|An [[ultraviolet]] image of NGC 4625 taken with [[GALEX]] shows a disc four times larger than what is seen in visible light]]

Unlike most [[spiral galaxies]], NGC 4625 has a single [[spiral arm]], which gives the galaxy an asymmetric appearance.<ref name="carnegieatlas">{{cite book 
  | author=A. Sandage | author2=J. Bedke
  | date=1994
  | title=Carnegie Atlas of Galaxies
  | publisher=[[Carnegie Institution of Washington]]
  | location=Washington, D.C.
  | isbn=978-0-87279-667-6 }}</ref>  It has been hypothesized that this galaxy's asymmetric structure may be the result of a [[interacting galaxies|gravitational interaction]] with [[NGC 4618]].<ref name="carnegieatlas" />  Such asymmetric structure is commonly seen among many interacting galaxies.  However, observations of neutral [[hydrogen]] gas in NGC 4618 and NGC 4625 show that NGC 4625 does not appear to have been affected by the gravitational interaction.<ref name="bushwilcots2004">{{cite journal
  | author=S. J. Bush | author2=E. M. Wilcots
  | title=Neutral Hydrogen in the Interacting Magellanic Spirals NGC 4618 and NGC 4625
  | journal=Astrophysical Journal
  | date=2004
  | volume=128
  | issue=6
  | pages=2789–2796
  | bibcode=2004AJ....128.2789B
  | doi=10.1086/425876|arxiv = astro-ph/0409209 | s2cid=14636586
 }}</ref>  This indicates that the single-arm structure seen in NGC 4625 may be created through intrinsic processes.

[[Ultraviolet]] observations of NGC 4625 made by the [[Galaxy Evolution Explorer]] (GALEX) show the presence of an extended disk. The new spiral disk extrends 28,000 light-years from the galaxy center, a staggering four times the optical radius. The hot blue stars in this new disk may have formed from the inflow of fresh gas and dust from interaction with its companions, NGC 4618 and NGC 4625A.<ref>{{cite book |author=Martin Ratcliffe |title=State of the Universe 2007: New Images, Discoveries, and Events |location=Google Books |publisher=Springer Praxis Books |date=December 8, 2006 |page=[https://archive.org/details/stateofuniverse20000ratc/page/29 29] |isbn=978-0387341781 |url=https://archive.org/details/stateofuniverse20000ratc/page/29 }}</ref> The UV-to-optical colors suggest that the bulk of the stars in the disk of NGC 4625 are currently being formed, providing a unique opportunity to study today the physics of star formation under conditions similar to those when the normal disks of spiral galaxies like the Milky Way first formed.<ref>{{cite journal |author=A. Gil de Paz |display-authors=etal |title=Discovery of an Extended Ultraviolet Disk in the Nearby Galaxy NGC 4625 |date=9 June 2005 |journal=The Astrophysical Journal Letters |volume=625 |issue=1 |pages=29–32 |doi=10.1086/432054 |arxiv=astro-ph/0506357 |bibcode = 2005ApJ...627L..29G |s2cid=55384358 }}</ref>

==Environment==

As mentioned above, NGC 4625 is [[interacting galaxies|interacting]] with [[NGC 4618]].<ref name="carnegieatlas" />

==See also==
* [[NGC 5713]] - ''a similar asymmetric spiral galaxy''

==References==
{{reflist}}

==External links==
* {{commonscat-inline}}


{{Ngc50}}
{{Canes Venatici}}

{{DEFAULTSORT:NGC 4625}}
[[Category:Canes II Group]]
[[Category:Peculiar galaxies]]
[[Category:Intermediate spiral galaxies]]
[[Category:Interacting galaxies]]
[[Category:Canes Venatici]]
[[Category:NGC objects|4625]]
[[Category:IC objects]]
[[Category:UGC objects|07861]]
[[Category:Principal Galaxies Catalogue objects|42607]]
[[Category:Magellanic spiral galaxies]]