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NGC 4565
NGC 4565 or Needle Galaxy
Observation data (J2000 epoch)
Constellation	Coma Berenices
Right ascension	12 36 20.8
Declination	+25° 59′ 16″
Redshift	0.004103
Heliocentric radial velocity	1230 ± 5 km/s
Distance	42.7 ± 12 Mly (13.1 ± 3.7 Mpc) 53 ± 4 Mly (16.2 ± 1.3 Mpc)
Apparent magnitude (V)	10.42
Characteristics
Type	SA(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. In the Catalogue of Named Galaxies, it is called Slipherius Comae Berenices, after Vesto Slipher, who measured its redshift in 1912. 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.

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.
4. Bodifee, Gerard. "Catalogue of One Thousand Named Galaxies" (PDF). Retrieved 21 May 2017.
5. "NGC4565 at". apod.nasa.gov.
6. Spiral Galaxy NGC 4565 at http://www.eso.org/public/images/eso0525a/
7. ^ Globular Cluster Systems in Galaxies Beyond the Local Group
8. ""Intermediate-band surface photometry of the edge-on galaxy NGC 4565". iop.org.
9. ^ Detection of a Distinct Pseudobulge Hidden Inside the ``Box-Shaped Bulge of NGC 4565
10. HALOGAS: H I Observations and Modeling of the Nearby Edge-on Spiral Galaxy NGC 4565

External links

Media related to NGC 4565 at Wikimedia Commons

• NGC 4565 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
• National Optical Astronomical Observatory – NGC 4565
• APOD (2010-03-04) – NGC 4565: Galaxy on Edge
• APOD (2009-04-28) – NGC 4565

• Unbarred spiral galaxies
• Coma Cluster
• Coma Berenices (constellation)
• NGC objects
• UGC objects
• Principal Galaxies Catalogue objects
• Caldwell objects
• Astronomical objects discovered in 1785