View source for 3C 244.1

{{Short description|Galaxy in the constellation Ursa Major}}
{{Quasar
| name=3C 244.1
| image= 3C 244.1 VLA firstimage.gif 
| epoch=[[J2000]]
| ra={{RA|10|33|33.90}}<ref name="ned">{{cite web
  | title=NASA/IPAC Extragalactic Database
  | work=Results for QSO B1030+585
  | url=http://nedwww.ipac.caltech.edu/
  | access-date=2006-10-26 }}</ref>
| dec={{DEC|+58|14|36.0}}<ref name="ned" />
| constellation name=[[Ursa Major]]
| z=0.43
| type=<ref name="ned" />
| dist_ly=
| appmag_v=19
| size_v=
| notes=
| names=[[Ursa Major]] B, [[List of astronomical catalogues#D|DA]] 287, [[Lyon-Meudon Extragalactic Database|LEDA]] 2821461, [[Third Cambridge Catalogue of Radio Sources|3C]] 244.1, [[Fourth Cambridge Survey|4C]] 58.21.
}}
'''Ursa Major B''' or '''3C 244.1''' is a [[radio galaxy]] located in the [[constellation]] [[Ursa Major]].

It is classified as a Fanaroff-Riley Type II (FRII) radio source, which means that the luminosity increases with distance from the core. There are two, asymmetrical radio-emitting lobes straddling the parent galaxy. These lobes have an angular separation of 52″ at a [[position angle]] of 168°. When measured in the optical band, this galaxy has a redshift value of ''z'' = 0.428, corresponding to a distance of 1.5&nbsp;[[parsec|Gpc]]. 3C 244.1 is located within a cluster of other galaxies.<ref name="apj565">{{cite journal
  | author=Feinstein, Carlos
  | author2=Macchetto, F. Duccio
  | author3=Martel, André R.
  | author4=Sparks, William B.
  | title=Filaments and Ionized Gas in the Vicinity of 3C 244.1 |date=January 2002
  | journal=The Astrophysical Journal | volume=565
  | issue=1 | pages=125–130
  | doi=10.1086/324604 | bibcode=2002ApJ...565..125F|arxiv = astro-ph/0110409 | s2cid=12148411
 }}</ref>

Observations with the [[Hubble Space Telescope]] show an [[elliptical galaxy]] with blobs and a filamentary structure. The radio jets being generated by the [[active galactic nucleus]] are interacting with the [[interstellar medium]], producing extended narrow line regions. These features are commonly associated with many active galaxies.<ref name="apj565" />  The axial ratio of the elliptical galaxy is 1.4, meaning it is about 1.4 times large along the primary axis than along the perpendicular axis.<ref>{{cite journal
  | author=McLure, Ross J. | title=A sample of radio galaxies spanning three decades in radio luminosity - I. The host galaxy properties and black hole masses | journal=[[Monthly Notices of the Royal Astronomical Society]]
  | volume=351 | issue=1 | pages=347–361
  | doi=10.1111/j.1365-2966.2004.07793.x
  | date=2004 | doi-access=free | bibcode=2004MNRAS.351..347M|arxiv = astro-ph/0403106 | s2cid=15474896 |display-authors=etal}}</ref>

At the nucleus of this galaxy is a [[supermassive black hole]] with an estimated {{nowrap|(9.5 ± 6.6) × 10<sup>8</sup>}} [[solar mass]]es. The dimensionless ratio of the black hole spin to the black hole mass-energy ''j'' is {{nowrap|0.12 ± 0.04}}.<ref>{{cite journal
  | last=Daly | first=Ruth A. |date=February 2009
  | title=Black Hole Spins of Radio Sources
  | journal=The Astrophysical Journal Letters
  | volume=691 | issue=2 | pages=L72–L76
  | doi=10.1088/0004-637X/691/2/L72 | bibcode=2009ApJ...691L..72D|arxiv = 0811.1897 | s2cid=119242789 }}</ref>

==See also==
* [[Lists of galaxies]]

==References==
{{Reflist|30em}}

==External links==
* [http://www.jb.man.ac.uk/atlas/object/3C244P1.html www.jb.man.ac.uk/atlas/]
* {{cite simbad|title=NAME UMa B}}
{{Sky|10|33|33.90|+|58|14|36.0|1}}
{{Ursa Major}}
{{Portal bar|Astronomy|Stars|Outer space}}
[[Category:Radio galaxies]]
[[Category:Ursa Major]]
[[Category:3C objects|244.1]]
[[Category:4C objects|+58.21]]
[[Category:LEDA objects|2821461]]