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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. 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. "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. ""Intermediate-band surface photometry of the edge-on galaxy NGC 4565". 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

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