| 词条 | NGC 604 | |
| 释义 |
| image = Nursery of New Stars - GPN-2000-000972.jpg |caption= {{longitem|NGC 604 inside the Triangulum Galaxy (viewed by the Hubble Space Telescope)|style=padding: 4px 0;}} | name = NGC 604 | type = H II region | epoch = J2000 | ra = {{RA|01|34|33.2}}[1] | dec = {{DEC|+30|47|06}}[1] | dist_ly = 2,700,000 | dist_pc = 840,000[2] | appmag_v = +14.0[1] | size_v = 1′.93 x 1′.2 arcmins[1] | constellation = Triangulum | radius_ly = 760[3] | absmag_v = -13.8 | notes = massive H II region 3.5 million years old[2] | names = }}NGC 604 is an H II region inside the Triangulum Galaxy. It was discovered by William Herschel on September 11, 1784. It is among the largest H II regions in the Local Group of galaxies; at the galaxy's estimated distance of 2.7 million light-years, its longest diameter is roughly 1,520 light years (~460 parsecs), over 40 times the size of the visible portion of the Orion Nebula. It is over 6,300 times more luminous than the Orion Nebula, and if it were at the same distance it would outshine Venus. Its gas is ionized by a cluster of massive stars at its center.[4] with 200 stars of spectral type O and WR, a mass of 105 solar masses, and an age of 3.5 million years;[2] however, unlike the Large Magellanic Cloud's Tarantula Nebula central cluster (R136), NGC 604's one is much less compact and more similar to a large stellar association, being considered the prototypical example of a Scaled OB Association (SOBA)[5] Image gallerySee also
References1. ^1 2 3 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 604 | url=http://nedwww.ipac.caltech.edu/ | accessdate=2006-09-03 }} {{Refbegin}}2. ^1 2 {{cite journal | author=Barba, Rodolfo | title=An in-depth analysis of a prototypical giant H II region: NGC 604 | journal=HST Proposal ID #10419 | date=2004 | volume= | pages=10419 | bibcode=2004hst..prop10419B }} 3. ^distance × sin( diameter_angle / 2 ) = 760 ly. radius 4. ^{{Cite APOD|date=2 November 2002|title=NGC 604: Giant Stellar Nursery|access-date=}} 5. ^{{cite journal | author=Maíz-Apellániz, J. | author2=Pérez, E. | author3=Mas-Hesse, J. M. | title=NGC 604, the Scaled OB Association (SOBA) Prototype. I. Spatial Distribution of the Different Gas Phases and Attenuation by Dust | journal=The Astronomical Journal | date=2004 | volume=128 | issue=3 | pages=1196–1218 | bibcode=2004AJ....128.1196M | doi=10.1086/422925|arxiv = astro-ph/0406130}}
External links{{commons|NGC 604|NGC 604}}
6 : H II regions|Triangulum (constellation)|NGC objects|Triangulum Galaxy|Astronomical objects discovered in 1784|Star-forming regions |
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