Markarian 177#SDSS1133
{{Short description|Blue Compact dwarf galaxy in the constellation Ursa Major}}
{{Infobox galaxy
| name = Markarian 177
| image =
| caption =
| credit =
| epoch = J2000.0
| constellation name = Ursa Major
| dist_ly = {{convert|90000000|ly|Mpc|abbr=on|lk=on}} {{hub|0.678}}
| notes =
| names = Markarian 177, MKR 177, MKN 177, MRK 177, Mark 177, 2MASX J11332348+5504204, SDSS J113323.47+550420.6, PGC 35678, LEDA 35678, UGCA 239
| references =
}}
Markarian 177 is a blue compact{{cite web |url= http://ned.ipac.caltech.edu/cgi-bin/NEDatt?objname=UGCA+239 |title= Classifications for UGCA 239 |publisher= NED |access-date= 22 November 2014 }} dwarf galaxy located {{convert|90000000|ly|Mpc|abbr=on}} away, at the constellation of Ursa Major, in the bowl of the Big Dipper asterism.{{cite news |url= http://phys.org/news/2014-11-mystery-dwarf-galaxy-ejected-black.html |title= Mystery of dwarf galaxy could be ejected black hole |date= 19 November 2014 |author= Niels Bohr Institute |publisher= Phys.org }} It was discovered by the astronomer Benjamin Markarian.
Markarian 177 is a peculiar galaxy that is receding from us at a rate of 2425 km/s. It has a visual apparent size of 0.41×0.34 arcmin.
SDSS1133
Near the galaxy, at over {{convert|2600|ly|pc|abbr=on}} from it, is a luminous X-ray source named SDSS J113323.97+550415.8 (SDSS1133), in orbit around Markarian 177. The source has been stable for some decades from the 1950s through the 2000s, and the emission region is some {{convert|40|ly|pc|abbr=on}} wide. It may be an ejected supermassive black hole from a galaxy that interacted with Markarian 177.
Alternative explanations for the X-ray source include it possibly being a luminous blue variable star that has recently undergone a supernova in the early 2000s, where for the previous five decades it had been in continuous eruption.{{cite news |url= http://www.sci-news.com/astronomy/science-mysterious-source-light-dwarf-galaxy-markarian177-02291.html |title= Astronomers Discover Mysterious Source of Light in Dwarf Galaxy Markarian 177 |date= 21 November 2014 |publisher= Sci-News.com }}{{cite web |url= http://www.nasa.gov/content/goddard/nasas-swift-mission-probes-an-exotic-object/ |title= NASA's Swift Mission Probes an Exotic Object: 'Kicked' Black Hole or Mega Star? |date= 19 November 2014 |author= Francis Reddy |publisher= NASA Goddard Space Flight Center }}
Further reading
- {{cite journal |title= SDSS1133: An Unusually Persistent Transient in a Nearby Dwarf Galaxy |author1=Michael Koss |author2=Laura Blecha |author3=Richard Mushotzky |author4=Chao Ling Hung |author5=Sylvain Veilleux |author6=Benny Trakhtenbrot |author7=Kevin Schawinski |author8=Daniel Stern |author9=Nathan Smith |author10=Yanxia Li |author11=Allison Man |author12=Alexei V. Filippenko |author13=Jon C. Mauerhan |author14=Kris Stanek |author15=David Sanders |arxiv= 1401.6798 |doi= 10.1093/mnras/stu1673 |bibcode= 2014MNRAS.445..515K |publication-date= November 2014 |date= 27 January 2014 |journal= Monthly Notices of the Royal Astronomical Society |volume= 445 |issue= 1 |pages= 515–527 |doi-access=free }}
References
External links
- {{cite news |url= http://phys.org/news/2014-11-mystery-dwarf-galaxy-ejected-black.html |title= Mystery of dwarf galaxy could be ejected black hole |date= 19 November 2014 |author= Niels Bohr Institute |publisher= Phys.org }}—VIDEO