NGC 604
| Emission nebula | |
|---|---|
| H II region | |
 | |
| Observation data:J2000epoch | |
| Right ascension | 01h34m33.2s[1] |
| Declination | +30° 47′ 06″[1] |
| Distance | 2,700,000ly(840,000[2]pc) |
| Apparent magnitude(V) | +14.0[1] |
| Apparent dimensions (V) | 1.93′x 1.2′arcmins[1] |
| Constellation | Triangulum |
| Physical characteristics | |
| Radius | 760[3]ly |
| Absolute magnitude(V) | -13.8 |
| Notable features | massiveH II region 3.5 million years old[2] |
NGC 604is anH II regioninside theTriangulum Galaxy.It was discovered byWilliam Herschelon September 11, 1784. It is among thelargest H II regionsin theLocal Groupof galaxies; at the galaxy's estimated distance of 2.7 millionlight-years,its longest diameter is roughly 1,520 light years (~460parsecs), over 40 times the size of the visible portion of theOrion Nebula.It is over 6,300 times moreluminousthan theOrion Nebula,and if it were at the same distance it would outshineVenus.Its gas isionizedby a cluster of massivestarsat its center[4]with 200 stars of spectral typeOandWR,a mass of 105solar masses,and an age of 3.5 million years;[2]however, unlike theLarge Magellanic Cloud'sTarantula Nebulacentral cluster (R136), NGC 604's one is much less compact and more similar to a largestellar association.[5]
See also
[edit]References
[edit]- ^abcd"NASA/IPAC Extragalactic Database".Results for NGC 604.Retrieved2006-09-03.
- ^abcBarba, Rodolfo (2004). "An in-depth analysis of a prototypical giant H II region: NGC 604".HST Proposal ID #10419:10419.Bibcode:2004hst..prop10419B.
- ^distance × sin( diameter_angle / 2 ) = 760 ly. radius
- ^Nemiroff, R.; Bonnell, J., eds. (2 November 2002)."NGC 604: Giant Stellar Nursery".Astronomy Picture of the Day.NASA.
- ^Maíz-Apellániz, J.; Pérez, E.; Mas-Hesse, J. M. (2004). "NGC 604, the Scaled OB Association (SOBA) Prototype. I. Spatial Distribution of the Different Gas Phases and Attenuation by Dust".The Astronomical Journal.128(3): 1196–1218.arXiv:astro-ph/0406130.Bibcode:2004AJ....128.1196M.doi:10.1086/422925.S2CID8099926.
- Some data in the table was updated from Sue French's column "Deep-sky Wonders", in the January 2006 issue ofSky & Telescope,p. 83.
External links
[edit]
- Nebula NGC 604 @ SEDS Messier pages
- NASA Astronomy Picture of the Day: NGC 604 (16 August 1996)
- NASA Astronomy Picture of the Day: NGC 604: Giant Stellar Nursery (11 December 2012)
| Location | Triangulum Galaxy→Triangulum subgroup→
Local Group→Local Sheet→Virgo Supercluster→Laniakea Supercluster→Local Hole→Observable universe→Universe Each arrow (→) may be read as "within" or "part of". |  |
|---|---|---|
| H II regions | ||
| Suspectedsatellite galaxies | ||
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