Willman 1

Willman 1

Infobox Galaxy


name = Willman 1
epoch = J2000
type = extreme dSph or
unusual globular clusterHarv|Willman|Blanton|West|Dalcanton|2005]
ra = RA|10|49|22.3
dec = DEC|+51|03|03.6
dist_ly = 120 ± 20 kly (38 ± 7 kpc)Harv|Willman|Masjedi|Hogg|Dalcanton|2006]
z =
appmag_v = 15.4 ± 0.4Ref_label|A|a|none
size_v =
constellation name = Ursa Major
notes =
names = SDSS J1049+5103

Willman 1 or SDSS J1049+5103 is an extreme globular cluster or ultra low-mass dwarf galaxyHarv|NED|2007] discovered by a team lead by Beth Willman of New York University, using Sloan Digital Sky Survey data. As of 2006, it is the third dimmest galaxy known, after Boo dSph and UMa dSph, 200 times dimmer than the next dimmest. The galaxy is a satellite of the Milky Way; ~120,000 light-years away. It has an absolute magnitude of -2.5. The luminosity function varies between the center and the tails which suggest mass segregation similar to that found in Palomar 5.

Notes

  1. Note_label|A|a|none15.4 ± 0.4 apparent magnitude - 5 * (log10(38 ± 7 kpc distance) - 1) = -2.5 absolute magnitude

References


* Harvard reference
Surname1 = NED
Title = Results for SDSS J1049+5103
Authorlink = NASA/IPAC Extragalactic Database
Journal = NASA/IPAC Extragalactic Database
Year = 2007
date= January 9 2007
Publisher = Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration
URL = http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=SDSS+J1049%2B5103
* Harvard reference
Surname1 = Willman
Given1 = Beth
Surname2 = Blanton
Given2 = Michael R.
Surname3 = West
Given3 = Andrew A.
Surname4 = Dalcanton
Given4 = Julianne J.
Surname5 = Hogg
Given5 = David W.
Surname6 = Schneider
Given6 = Donald P.
Surname7 = Wherry
Given7 = Nicholas
Surname8 = Yanny
Given8 = Brian
Surname9 = Brinkmann
Given9 = Jon
Title = A New Milky Way Companion: Unusual Globular Cluster or Extreme Dwarf Satellite?
Journal = The Astronomical Journal
Year = 2005
Volume = 129
Issue = 6
Pages = 2692-2700
URL = http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2005AAS...207.9101W
* Harvard reference
Surname1 = Willman
Given1 = Beth
Surname2 = Masjedi
Given2 = Morad
Surname3 = Hogg
Given3 = David W.
Surname4 = Dalcanton
Given4 = Julianne J.
Surname5 = Martinez-Delgado
Given5 = David
Surname6 = Blanton
Given6 = Michael
Surname7 = West
Given7 = Andrew A.
Surname8 = Dotter
Given8 = Aaron
Surname9 = Chaboyer
Given9 = Brian
Title = Willman 1 - A Galactic Satellite at 40 kpc With Multiple Stellar Tails
Journal = The Astronomical Journal
Year = 2006
date= March 2006
Volume = subject to acceptance
Issue =
Pages =
URL = http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2006astro.ph..3486W

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