| 词条 | NGC 4565 |
| 释义 |
| name = NGC 4565 | image = Needle Galaxy 4565.jpeg | image_size = 300px| caption = NGC 4565 or Needle Galaxy | epoch = J2000 | type = SA(s)b?[1] | ra = {{RA|12|36|20.8}}[1] | dec = {{DEC|+25|59|16}}[1] | z = 0.004103[1] | h_radial_v = {{nowrap|1230 ± 5 km/s}}[1] | dist_ly = 42.7 ± 12 Mly (13.1 ± 3.7 Mpc)[2] 53 ± 4 Mly (16.2 ± 1.3 Mpc)[3] | appmag_v = 10.42[1] | size_v = 15′.90 × 1′.85[1] | constellation name = Coma Berenices | names = UGC 7772,[1] PGC 42038,[1] Caldwell 38 }}NGC 4565 (also known as the Needle Galaxy or Caldwell 38) is an edge-on spiral galaxy about 30 to 50 million light-years away in the constellation Coma Berenices.[2] It lies close to the North Galactic Pole and has a visual magnitude of approximately 10. It is known as the Needle Galaxy for its narrow profile.[4] First recorded in 1785 by William Herschel, it is a prominent example of an edge-on spiral galaxy.[5] CharacteristicsNGC 4565 is a giant spiral galaxy more luminous than the Andromeda Galaxy.[6] Much speculation exists in literature as to the nature of the central bulge. In the absence of clear-cut dynamical data on the motions of stars in the bulge, the photometric data alone cannot adjudge among various options put forth. However, its exponential shape suggested that it is a barred spiral galaxy.[7] Studies with the help of the Spitzer Space Telescope not only confirmed the presence of a central bar but also showed a pseudobulge within it as well as an inner ring.[8] NGC 4565 has at least two satellite galaxies, one of which is interacting with it.[9] It has a population of roughly 240 globular clusters, more than the Milky Way.[6] NGC 4565 is one of the brightest[10] member galaxies of the Coma I Group.[11][10] References1. ^1 2 3 4 5 6 7 8 {{cite web| title=Results for NGC 4565| work=NASA/IPAC Extragalactic Database| url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+4565&img_stamp=yes&extend=no| accessdate=2006-10-12 }} 2. ^1 {{cite web| title=Distance Results for NGC 4565| work=NASA/IPAC Extragalactic Database| url=http://nedwww.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+4565| accessdate=2010-05-02}} 3. ^{{cite journal| author=Jensen, Joseph B. | display-authors=4 | author2=Tonry, John L. | author3=Barris, Brian J. | author4=Thompson, Rodger I. | author5=Liu, Michael C. | author6=Rieke, Marcia J. | author7=Ajhar, Edward A. | author8=Blakeslee, John P.| title=Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations| journal=Astrophysical Journal|date=February 2003| volume=583| issue=2| pages=712–726| bibcode=2003ApJ...583..712J| doi=10.1086/345430| arxiv = astro-ph/0210129 }} 4. ^{{cite web|url=http://apod.nasa.gov/apod/ap040409.html|title=NGC4565 at |website=apod.nasa.gov}} 5. ^Spiral Galaxy NGC 4565 at http://www.eso.org/public/images/eso0525a/ 6. ^1 Globular Cluster Systems in Galaxies Beyond the Local Group 7. ^{{cite web|url=http://www.iop.org/EJ/article/1538-3881/123/3/1364/201272.text.html|title=Intermediate-band surface photometry of the edge-on galaxy NGC 4565|website=iop.org}} 8. ^Detection of a Distinct Pseudobulge Hidden Inside the ``Box-Shaped Bulge of NGC 4565 9. ^HALOGAS: H I Observations and Modeling of the Nearby Edge-on Spiral Galaxy NGC 4565 10. ^1 {{Cite web|url=https://www.webbdeepsky.com/galaxies/object?object=NGC4565|title=Webb Deep-Sky Society: Galaxy of the Month: NGC4565|website=www.webbdeepsky.com|language=en|access-date=2018-05-20}} 11. ^{{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}} External links{{commonscatinline}}
9 : Unbarred spiral galaxies|Coma Berenices (constellation)|NGC objects|UGC objects|Principal Galaxies Catalogue objects|Caldwell objects|Astronomical objects discovered in 1785|Discoveries by William Herschel|Coma I Group |
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