(Translated by https://www.hiragana.jp/)
NGC 681: Difference between revisions - Wikipedia Jump to content

NGC 681: Difference between revisions

Coordinates: Sky map 01h 49m 10.829s, −10° 25′ 35.13″
From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
replaced image
Could not find any other sources calling this galaxy the Little Sombrero. All sources designate NGC 7814 as the Little Sombrero Galaxy, including a NASA press release.
Line 21: Line 21:
|names={{odlist|MCG= -02-05-052|PGC=6671}}<ref>{{cite simbad|title=NGC 681|accessdate=2021-02-19}}</ref>
|names={{odlist|MCG= -02-05-052|PGC=6671}}<ref>{{cite simbad|title=NGC 681|accessdate=2021-02-19}}</ref>
|image_size=250}}
|image_size=250}}
'''NGC 681''' (also known as the '''Little Sombrero Galaxy''') is an [[intermediate spiral galaxy]] in the [[constellation]] of [[Cetus]], located approximately 66.5 million [[light-year]]s from Earth.<ref name="ned">{{Cite web|url=https://ned.ipac.caltech.edu/?q=byname&obj_sort=RA%20or%20Longitude&out_csys=Equatorial&out_equinox=J2000.0&objname=NGC%20681&hconst=73&extend=no&list_limit=5&img_stamp=YES&of=pre_text&omegav=0.73&corr_z=1&omegam=0.27|title=NGC 681 NASA/IPAC Extragalactic Database Results |website=ned.ipac.caltech.edu|access-date=November 2, 2018}}</ref><ref name="professor">{{Cite web|url=http://cseligman.com/text/atlas/ngc6a.htm#681|title=New General Catalog Objects: NGC 650 - 699|website=cseligman.com|access-date=November 2, 2018}}</ref><ref name="revised">{{Cite web|url=http://spider.seds.org/ngc/revngcic.cgi?NGC681|title=Revised NGC Data for NGC 681|website=spider.seds.org|access-date=November 2, 2018}}</ref> The name Little Sombrero Galaxy is a reference to a much larger and earlier observed sombrero-like galaxy designated [[Sombrero Galaxy|M104]], or the Sombrero Galaxy.
'''NGC 681''' is an [[intermediate spiral galaxy]] in the [[constellation]] of [[Cetus]], located approximately 66.5 million [[light-year]]s from Earth.<ref name="ned">{{Cite web|url=https://ned.ipac.caltech.edu/?q=byname&obj_sort=RA%20or%20Longitude&out_csys=Equatorial&out_equinox=J2000.0&objname=NGC%20681&hconst=73&extend=no&list_limit=5&img_stamp=YES&of=pre_text&omegav=0.73&corr_z=1&omegam=0.27|title=NGC 681 NASA/IPAC Extragalactic Database Results |website=ned.ipac.caltech.edu|access-date=November 2, 2018}}</ref><ref name="professor">{{Cite web|url=http://cseligman.com/text/atlas/ngc6a.htm#681|title=New General Catalog Objects: NGC 650 - 699|website=cseligman.com|access-date=November 2, 2018}}</ref><ref name="revised">{{Cite web|url=http://spider.seds.org/ngc/revngcic.cgi?NGC681|title=Revised NGC Data for NGC 681|website=spider.seds.org|access-date=November 2, 2018}}</ref>
[[File:NGC681 - SDSS DR14.jpg|left|thumb|[[Sloan Digital Sky Survey|SDSS]] image of NGC 681]]
[[File:NGC681 - SDSS DR14.jpg|left|thumb|[[Sloan Digital Sky Survey|SDSS]] image of NGC 681]]
{{clear left}}
{{clear left}}
Line 29: Line 29:


== Physical characteristics ==
== Physical characteristics ==
The Little Sombrero Galaxy shares many structural similarities with its namesake, M104, although it is smaller, less luminous, and less massive. Its thin, dusty [[Galactic disc|disc]] is seen almost perfectly edge-on and features a small, very bright nucleus in the center of a very pronounced [[Bulge (astronomy)|bulge]].<ref name="bigsombrero">{{Cite journal|last=Faber|first=S. M. |last2=Balick |first2=B. |last3=Gallagher|first3=J. S.|last4=Knapp|first4=G. R.|date=1977|title=The neutral hydrogen content, stellar rotation curve, and mass-to-light ratio of NGC 4594, the "Sombrero" galaxy.|journal=The Astrophysical Journal|volume=214|pages=383–389|doi=10.1086/155260|issn=0004-637X|bibcode=1977ApJ...214..383F }}</ref> Distinctly unlike M104, NGC 681's disc contains many [[H II region]]s, where [[star formation]] is likely to be occurring.<ref name="smallsombrero">{{Cite journal|last=Burbridge|first=E. M.|last2=G.R.|first2=Burbridge|last3=Prendergast|first3=K.H.|date=1965|title=Rotation and Mass of the SA Galaxy, NGC 681|url=http://adsbit.harvard.edu//full/1965ApJ...142..154B/0000154.000.html|journal=Astrophysical Journal|volume=142|pages=154–159|bibcode=1965ApJ...142..154B|doi=10.1086/148270|hdl=2060/19650010085|hdl-access=free}}</ref><ref name="bigsombrero" /> The galaxy has a mass of {{Val|1.9e10}} [[Solar mass|<var>M</var><sub>☉</sub>]], a [[mass-to-light ratio]] of 3.6 <math>\Upsilon\odot</math>, and a spiral pattern which is asymmetrical.<ref name="smallsombrero" />{{notelist}}
NGC 681 shares many structural similarities with its namesake, M104, although it is smaller, less luminous, and less massive. Its thin, dusty [[Galactic disc|disc]] is seen almost perfectly edge-on and features a small, very bright nucleus in the center of a very pronounced [[Bulge (astronomy)|bulge]].<ref name="bigsombrero">{{Cite journal|last=Faber|first=S. M. |last2=Balick |first2=B. |last3=Gallagher|first3=J. S.|last4=Knapp|first4=G. R.|date=1977|title=The neutral hydrogen content, stellar rotation curve, and mass-to-light ratio of NGC 4594, the "Sombrero" galaxy.|journal=The Astrophysical Journal|volume=214|pages=383–389|doi=10.1086/155260|issn=0004-637X|bibcode=1977ApJ...214..383F }}</ref> Distinctly unlike M104, NGC 681's disc contains many [[H II region]]s, where [[star formation]] is likely to be occurring.<ref name="smallsombrero">{{Cite journal|last=Burbridge|first=E. M.|last2=G.R.|first2=Burbridge|last3=Prendergast|first3=K.H.|date=1965|title=Rotation and Mass of the SA Galaxy, NGC 681|url=http://adsbit.harvard.edu//full/1965ApJ...142..154B/0000154.000.html|journal=Astrophysical Journal|volume=142|pages=154–159|bibcode=1965ApJ...142..154B|doi=10.1086/148270|hdl=2060/19650010085|hdl-access=free}}</ref><ref name="bigsombrero" /> The galaxy has a mass of {{Val|1.9e10}} [[Solar mass|<var>M</var><sub>☉</sub>]], a [[mass-to-light ratio]] of 3.6 <math>\Upsilon\odot</math>, and a spiral pattern which is asymmetrical.<ref name="smallsombrero" />{{notelist}}


== See also ==
== See also ==

Revision as of 11:28, 25 June 2024


NGC 681
legacy surveys image of NGC 681
Observation data (J2000 epoch)
ConstellationCetus
Right ascension01h 49m 10.829s[1]
Declination−10° 25′ 35.13″[1]
Redshift0.00587 ± 0.00002[1]
Heliocentric radial velocity1760.4 ± 6.6 km/s[1]
Distance~66.5 million ly (20.39 ± 1.45 Mpc)[1]
Apparent magnitude (V)12[2]
Characteristics
TypeSAB(s)ab
Mass1.9×1010[3] M☉
Mass/Light ratio3.6[3] M☉/L☉
Size~29.07 kpc (diameter)[1]
Apparent size (V)2.70 × 1.8 arcmin[2][4]
Other designations
MCG -02-05-052, PGC 6671[5]

NGC 681 is an intermediate spiral galaxy in the constellation of Cetus, located approximately 66.5 million light-years from Earth.[1][2][4]

SDSS image of NGC 681

Observation history

NGC 681 was discovered by the German-born British astronomer William Herschel on 28 November 1785 and was later also observed by William's son, John Herschel.[2] John Louis Emil Dreyer, compiler of the first New General Catalogue of Nebulae and Clusters of Stars, described NGC 681 as being a "pretty faint, considerably large, round, small (faint) star 90 arcsec to [the] west" that becomes "gradually a little brighter [in the] middle".[2]

Physical characteristics

NGC 681 shares many structural similarities with its namesake, M104, although it is smaller, less luminous, and less massive. Its thin, dusty disc is seen almost perfectly edge-on and features a small, very bright nucleus in the center of a very pronounced bulge.[6] Distinctly unlike M104, NGC 681's disc contains many H II regions, where star formation is likely to be occurring.[3][6] The galaxy has a mass of 1.9×1010 M☉, a mass-to-light ratio of 3.6 , and a spiral pattern which is asymmetrical.[3]

See also

References

  1. ^ a b c d e f g "NGC 681 NASA/IPAC Extragalactic Database Results". ned.ipac.caltech.edu. Retrieved November 2, 2018.
  2. ^ a b c d e "New General Catalog Objects: NGC 650 - 699". cseligman.com. Retrieved November 2, 2018.
  3. ^ a b c d Burbridge, E. M.; G.R., Burbridge; Prendergast, K.H. (1965). "Rotation and Mass of the SA Galaxy, NGC 681". Astrophysical Journal. 142: 154–159. Bibcode:1965ApJ...142..154B. doi:10.1086/148270. hdl:2060/19650010085.
  4. ^ a b "Revised NGC Data for NGC 681". spider.seds.org. Retrieved November 2, 2018.
  5. ^ "NGC 681". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-19.
  6. ^ a b Faber, S. M.; Balick, B.; Gallagher, J. S.; Knapp, G. R. (1977). "The neutral hydrogen content, stellar rotation curve, and mass-to-light ratio of NGC 4594, the "Sombrero" galaxy". The Astrophysical Journal. 214: 383–389. Bibcode:1977ApJ...214..383F. doi:10.1086/155260. ISSN 0004-637X.
  • Media related to NGC 681 at Wikimedia Commons


Retrieved from "https://en.wikipedia.org/w/index.php?title=NGC_681&oldid=1230912060"