| 词条 | NGC 4414 |
| 释义 |
| name = NGC 4414 | image = NGC 4414 (NASA-med).jpg | image_size = 275px |caption = as observed by the Hubble Space Telescope (HST) | epoch = J2000 | type = SA(rs)c[1] | ra = {{RA|12|26|27.1}}[1] | dec = {{DEC|+31|13|25}}[1] | dist_ly = 62.3 Mly[2] | z = 716 ± 6 km/s[1] | appmag_v = 11.0[1] | size_v = 3′.6 × 2′.0[1] | constellation name = Coma Berenices | names = UGC 7539,[1] PGC 40692[1] }} NGC 4414 is an unbarred spiral galaxy about 62 million light-years away in the constellation Coma Berenices. It is a flocculent spiral galaxy, with short segments of spiral structure but without the dramatic well-defined spiral arms of a grand design spiral. In 1974 a supernova, SN 1974G, was observed and was the only supernova in this galaxy to be recorded until June 7, 2013 when SN 2013df was discovered at Magnitude 14. It was imaged by the Hubble Space Telescope in 1995, as part of the HST's main mission to determine the distance to galaxies, and again in 1999 as part of the Hubble Heritage project. It has been part of an ongoing effort to study its Cepheid variable stars. The outer arms appear blue due to the continuing formation of young stars and include a possible luminous blue variable with an absolute magnitude of −10.[3] NGC 4414 is also a very isolated galaxy without signs of past interactions with other galaxies[4] and despite not being a starburst galaxy shows a high density and richness of gas - both atomic and molecular, with the former extending far beyond its optical disk.[5] NGC 4414 is a member of the Coma I Group, a group of galaxies lying physically close to the Virgo Cluster.[6][7] References1. ^1 2 3 4 5 6 7 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 4414 | url=http://nedwww.ipac.caltech.edu/ | accessdate=2006-11-25 }} 2. ^{{cite journal | title=Pattern Speeds BIMA-SONG Galaxies with Molecule-Dominated ISMs Using the Tremaine-Weinberg Method | volume=614 | issue=1 | pages=142–157 | journal=(Turner et Al. 1998) | arxiv=astro-ph/0406426|bibcode = 2004ApJ...614..142R |doi = 10.1086/423423 | year=2004 | last1=Rand | first1=Richard J. | last2=Wallin | first2=John F. }} 3. ^{{cite journal | author=Frattare, L. M. | author2=Zurek, D. R. | title=The Discovery of a Possible Luminous Blue Variable in NGC 4414 | journal=American Astronomical Society, 194th AAS Meeting, #82.02; Bulletin of the American Astronomical Society | date=1997 | volume=31 | pages=967 | bibcode=1999AAS...194.8202F}} 4. ^{{cite journal | author=Braine, J. | author2=Brouillet, N. | author3=Baudry, A. | title=The anatomy of an isolated spiral galaxy: NGC 4414. | journal=Astronomy and Astrophysics | date=1997 | volume=318 | pages=19–28 | bibcode=1997A&A...318...19B}} 5. ^{{cite journal | author=Braine, J. | author2=Combes, F. | author3=van Driel, W. | title=NGC 4414: A flocculent galaxy with a high gas surface density | journal=Astronomy and Astrophysics | date=1993 | volume=280 | number=2 | pages=451–467 | bibcode=1993A&A...280..451B}} 6. ^{{Cite journal|last=Gregory|first=Stephen A.|last2=Thompson|first2=Laird A.|date=April 1977|title=The Coma i Galaxy Cloud|bibcode=1977ApJ...213..345G|journal=The Astrophysical Journal|language=en|volume=213|pages=345–350|doi=10.1086/155160|issn=0004-637X}} 7. ^{{Cite news|url=http://annesastronomynews.com/photo-gallery-ii/galaxies-clusters/ngc-4414/|title=NGC 4414, a dusty spiral galaxy in Coma Berenices|date=2012-11-12|work=Anne's Astronomy News|access-date=2018-05-02|language=nl-NL}} External links
7 : Flocculent spiral galaxies|Unbarred spiral galaxies|Coma Berenices (constellation)|NGC objects|UGC objects|Principal Galaxies Catalogue objects|Coma I Group |
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