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{{Short description|Galaxy in the constellation Coma Berenices}}
{{Infobox Galaxy {{Infobox Galaxy
| name = ] 4565 | name = ] 4565
| image = ]| caption = NGC 4565 or Needle Galaxy | image = Needle Galaxy 4565.jpeg
| image_size = 300px
| caption = NGC 4565
| epoch = ] | epoch = ]
| type = SA(s)b?<ref name="ned">{{cite web | type = SA(s)b?<ref name="ned">{{cite web
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| work=NASA/IPAC Extragalactic Database | work=NASA/IPAC Extragalactic Database
| url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+4565&img_stamp=yes&extend=no | url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+4565&img_stamp=yes&extend=no
| accessdate=2006-10-12 }}</ref> | access-date=2006-10-12 }}</ref>
| ra = {{RA|12|36|20.8}}<ref name="ned"/> | ra = {{RA|12|36|20.8}}<ref name="ned"/>
| dec = {{DEC|+25|59|16}}<ref name="ned"/> | dec = {{DEC|+25|59|16}}<ref name="ned"/>
Line 16: Line 19:
| work=NASA/IPAC Extragalactic Database | work=NASA/IPAC Extragalactic Database
| url=http://nedwww.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+4565 | url=http://nedwww.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+4565
| accessdate=2010-05-02}}</ref><br/>] ] (16.2 ± 1.3 ])<ref name="jensenetal2003">{{cite journal | access-date=2010-05-02}}</ref><br/>] ] (16.2 ± 1.3 ])<ref name="jensenetal2003">{{cite journal
| author=Jensen, Joseph B.; Tonry, John L.; Barris, Brian J.; Thompson, Rodger I.; Liu, Michael C.; Rieke, Marcia J.; Ajhar, Edward A.; Blakeslee, John P. | 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 | title=Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations
| journal=Astrophysical Journal | journal=Astrophysical Journal
Line 26: Line 29:
| bibcode=2003ApJ...583..712J | bibcode=2003ApJ...583..712J
| doi=10.1086/345430 | doi=10.1086/345430
| arxiv = astro-ph/0210129 }}</ref> | arxiv = astro-ph/0210129 | s2cid=551714 }}</ref>
| appmag_v = 10.42<ref name="ned"/> | appmag_v = 10.42<ref name="ned"/>
| size_v = 15&prime;.90 &times; 1&prime;.85<ref name="ned"/> | size_v = 15.90{{prime}} × 1.85{{prime}}<ref name="ned"/>
| constellation name = ] | constellation name = ]
| names = ] 7772,<ref name="ned"/> ] 42038,<ref name="ned"/> ]&nbsp;38 | names = ] 7772,<ref name="ned"/> ] 42038,<ref name="ned"/> ]&nbsp;38
}} }}


'''NGC 4565''' (also known as the '''Needle Galaxy''' or '''Caldwell 38''') is an edge-on ] about 30 to 50 million ]s away<ref name=ned-dist/> in the ] ]. '''NGC 4565''' (also known as the '''Needle Galaxy''' or '''Caldwell 38''') is an edge-on ] about 30 to 50 million ]s away in the ] ].<ref name=ned-dist/> It lies close to the ] and has a ] of approximately 10. It is known as the Needle Galaxy for its narrow profile.<ref name="apod-040409">{{cite web|url=http://apod.nasa.gov/apod/ap040409.html|title=NGC4565 at |website=apod.nasa.gov}}</ref> First recorded in 1785 by ], it is a prominent example of an edge-on spiral galaxy.<ref>Spiral Galaxy NGC 4565 at http://www.eso.org/public/images/eso0525a/</ref>

The 10th magnitude galaxy sits perpendicular to our own Milky Way galaxy and is almost directly above the North Galactic Pole (in the same way Polaris is located above the Earth's North Pole).

It is known as the Needle Galaxy for its narrow profile.<ref name="apod-040409">NGC4565 at http://apod.nasa.gov/apod/ap040409.html</ref> First spotted in 1785 by Sir ] (1738–1822), this is one of the most famous examples of an edge-on spiral galaxy.<ref>Spiral Galaxy NGC 4565 at http://www.eso.org/gallery/v/ESOPIA/Galaxies/phot-24a-05.tif.html</ref> "Visible through a small telescope, some sky enthusiasts consider NGC 4565 to be a prominent celestial masterpiece Messier missed."<ref name="apod-040409" />


== Characteristics == == Characteristics ==
NGC 4565 is a giant spiral galaxy more luminous than the ].<ref name="Harrisglobulars"></ref> 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 ].<ref>{{cite journal|url=https://iopscience.iop.org/article/10.1086/338849|title=Intermediate-band surface photometry of the edge-on galaxy NGC 4565|journal=The Astronomical Journal|date=2002 |doi=10.1086/338849 |last1=Wu |first1=Hong |last2=Burstein |first2=David |last3=Deng |first3=Zugan |last4=Zhou |first4=Xu |last5=Shang |first5=Zhaohui |last6=Zheng |first6=Zhongyuan |last7=Chen |first7=Jiansheng |last8=Su |first8=Hongjun |last9=Windhorst |first9=Rogier A. |last10=Chen |first10=Wen-Ping |last11=Zou |first11=Zhenlong |last12=Xia |first12=Xiaoyang |last13=Jiang |first13=Zhaoji |last14=Ma |first14=Jun |last15=Xue |first15=Suijian |last16=Zhu |first16=Jin |last17=Cheng |first17=Fuzhen |last18=Byun |first18=Yong-Ik |last19=Chen |first19=Rui |last20=Deng |first20=Licai |last21=Fan |first21=Xiaohui |last22=Fang |first22=Li-Zhi |last23=Kong |first23=Xu |last24=Li |first24=Yong |last25=Lin |first25=Weipeng |last26=Lu |first26=Phillip |last27=Sun |first27=Wei-Hsin |last28=Tsay |first28=Wean-Shun |last29=Xu |first29=Wen |last30=Yan |first30=Haojing |volume=123 |issue=3 |pages=1364–1380 |arxiv=astro-ph/0111433 |bibcode=2002AJ....123.1364W |display-authors=1 }}</ref> Studies with the help of the ] not only confirmed the presence of a central bar but also showed a ] within it as well as an inner ring.<ref name="Spitzer"></ref>


⚫ NGC 4565 has at least two ], one of which is ] with it.<ref name="HALOGAS"></ref> It has a population of roughly 240 ]s, more than the ].<ref name="Harrisglobulars" />
Much speculation exists in the 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 suggests that it is a ].;<ref>"Intermediate-band surface photometry of the edge-on galaxy NGC 4565" at http://www.iop.org/EJ/article/1538-3881/123/3/1364/201272.text.html</ref> subsequent studies with the help of the ] not only confirm the presence of a central bar but also show a ] within it as well as an inner ring.<ref name="Spitzer"></ref>


NGC 4565 is one of the brightest<ref name=":0">{{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}}</ref> member galaxies of the ].<ref>{{Cite journal|last1=Gregory|first1=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}}</ref><ref name=":0" />
NGC 4565 is a giant spiral galaxy more luminous than the ]<ref name="Harrisglobulars"></ref> and it has been proposed that if it were viewed face-on, it would be the most spectacular of the galaxies of its type in the nearby Universe.<ref name="Spitzer" />


This edge-on galaxy exhibits a slightly warped and extended disk under deep optical surveys, likely due to ongoing interactions with neighboring satellite galaxies or other galaxies in the Coma I group. GALEX images show the slight warp at the edge of the disc more clearly than other surveys.
⚫ NGC 4565 has at least two ], one of which is ] with it <ref name="HALOGAS"></ref>


Using the ] (LOFAR), astronomers of the ] discovered a diffuse ] around NGC 4565. During the observations, a warp was detected in the radio continuum of NGC 4565 that is reminiscent of a ] (HI) warp and identifying a slight flaring of the galaxy's radio halo. It is assumed that this flaring is caused by the warp as the vertical intensity profiles are asymmetric, which is in agreement with the warp. According to the study, a minimum age for the warp was estimated at approximately 130 million years. This is the spectral age of the galaxy's ] electrons, during which they are transported into the warp. This indicates that NGC 4565 may be in the aftermath of a period with more intense ].
It has a population of roughly 240 ]s, more than the Milky Way.<ref name="Harrisglobulars" />


]]]
]


== References == == References ==
Line 55: Line 55:


== External links == == External links ==
* {{commonscatinline}}
{{commons category}}

* {{WikiSky}} * {{WikiSky}}
* – NGC 4565 * {{Webarchive|url=https://web.archive.org/web/20090522041947/http://www.noao.edu/outreach/aop/observers/n4565.html |date=2009-05-22 }} – NGC 4565
* - NGC 4565: Galaxy on Edge
* – NGC 4565: Galaxy on Edge * – NGC 4565: Galaxy on Edge
* – NGC 4565 * – NGC 4565
* – NGC 4565


{{Sky|12|36|20.8|+|25|59|16|53000000}} {{Sky|12|36|20.8|+|25|59|16|53000000}}
⚫ {{Catalogs | C = 38 | NGC = 4565 | UGC = 7772 | PGC = 42038}}

{{Caldwell catalogue}}
⚫ {{Catalogs | C = 38 | NGC = 4565 | UGC = 7772}}
{{Ngc50}}

{{Coma Berenices}}
⚫ ]
{{Portal bar|Astronomy|Stars|Spaceflight|Outer space|Solar System}}
{{DEFAULTSORT:NGC 4565}}
] ]
] ]
]
] ]
] ]
] ]
] ]
]
]
⚫ ]

Latest revision as of 00:16, 23 August 2024

Galaxy in the constellation Coma Berenices
NGC 4565
NGC 4565
Observation data (J2000 epoch)
ConstellationComa Berenices
Right ascension12 36 20.8
Declination+25° 59′ 16″
Redshift0.004103
Heliocentric radial velocity1230 ± 5 km/s
Distance42.7 ± 12 Mly (13.1 ± 3.7 Mpc)
53 ± 4 Mly (16.2 ± 1.3 Mpc)
Apparent magnitude (V)10.42
Characteristics
TypeSA(s)b?
Apparent size (V)15.90′ × 1.85′
Other designations
UGC 7772, PGC 42038, 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. 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. First recorded in 1785 by William Herschel, it is a prominent example of an edge-on spiral galaxy.

Characteristics

NGC 4565 is a giant spiral galaxy more luminous than the Andromeda Galaxy. 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. 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.

NGC 4565 has at least two satellite galaxies, one of which is interacting with it. It has a population of roughly 240 globular clusters, more than the Milky Way.

NGC 4565 is one of the brightest member galaxies of the Coma I Group.

This edge-on galaxy exhibits a slightly warped and extended disk under deep optical surveys, likely due to ongoing interactions with neighboring satellite galaxies or other galaxies in the Coma I group. GALEX images show the slight warp at the edge of the disc more clearly than other surveys.

Using the LOw-Frequency ARray (LOFAR), astronomers of the University of Hamburg discovered a diffuse radio halo around NGC 4565. During the observations, a warp was detected in the radio continuum of NGC 4565 that is reminiscent of a neutral hydrogen line (HI) warp and identifying a slight flaring of the galaxy's radio halo. It is assumed that this flaring is caused by the warp as the vertical intensity profiles are asymmetric, which is in agreement with the warp. According to the study, a minimum age for the warp was estimated at approximately 130 million years. This is the spectral age of the galaxy's cosmic ray electrons, during which they are transported into the warp. This indicates that NGC 4565 may be in the aftermath of a period with more intense star formation.

A detailed view of part of the disc of the spiral galaxy NGC 4565 imaged by the Hubble Space Telescope

References

  1. ^ "Results for NGC 4565". NASA/IPAC Extragalactic Database. Retrieved 2006-10-12.
  2. ^ "Distance Results for NGC 4565". NASA/IPAC Extragalactic Database. Retrieved 2010-05-02.
  3. Jensen, Joseph B.; Tonry, John L.; Barris, Brian J.; Thompson, Rodger I.; et al. (February 2003). "Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations". Astrophysical Journal. 583 (2): 712–726. arXiv:astro-ph/0210129. Bibcode:2003ApJ...583..712J. doi:10.1086/345430. S2CID 551714.
  4. "NGC4565 at". apod.nasa.gov.
  5. Spiral Galaxy NGC 4565 at http://www.eso.org/public/images/eso0525a/
  6. ^ Globular Cluster Systems in Galaxies Beyond the Local Group
  7. Wu, Hong; et al. (2002). "Intermediate-band surface photometry of the edge-on galaxy NGC 4565". The Astronomical Journal. 123 (3): 1364–1380. arXiv:astro-ph/0111433. Bibcode:2002AJ....123.1364W. doi:10.1086/338849.
  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. ^ "Webb Deep-Sky Society: Galaxy of the Month: NGC4565". www.webbdeepsky.com. Retrieved 2018-05-20.
  11. Gregory, Stephen A.; Thompson, Laird A. (April 1977). "The Coma i Galaxy Cloud". The Astrophysical Journal. 213: 345–350. Bibcode:1977ApJ...213..345G. doi:10.1086/155160. ISSN 0004-637X.

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