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NGC 4565

Galaxy in the constellation Coma Berenices

Galaxy in the constellation Coma Berenices

FieldValue
nameNGC 4565
imageNeedle Galaxy 4565.jpeg
captionNGC 4565
epochJ2000
typeSA(s)b?{{cite web
titleResults for NGC 4565
workNASA/IPAC Extragalactic Database
urlhttp://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+4565&img_stamp=yes&extend=no
access-date2006-10-12 }}
ra
dec
z0.004276
h_radial_v1282 ± 1 km/s
dist_ly11.700 ± 0.697 Mpc{{cite web
titleDistance Results for NGC 4565
websiteNASA/IPAC Extragalactic Database
urlhttp://nedwww.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+4565
access-date2010-05-02}}
53 ± 4 Mly (16.2 ± 1.3 Mpc){{cite journalauthor=Jensen, Joseph B.display-authors=4author2=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 Fluctuationsjournal=Astrophysical Journal
dateFebruary 2003volume=583issue=2pages=712–726bibcode=2003ApJ...583..712Jdoi=10.1086/345430arxiv = astro-ph/0210129s2cid=551714}}
appmag_v10.42
size_v
size~175,850 ly 53.94 [kpc] (estimated)
constellation nameComa Berenices
names

| access-date=2006-10-12 }} | access-date=2010-05-02}} 53 ± 4 Mly (16.2 ± 1.3 Mpc){{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

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 was discovered by German-British astronomer William Herschel on 6 April 1785.

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.

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.

Galaxy Groups

NGC 4565, along with NGC 4562, IC 3543, and IC 3546, are listed together as Holm 426 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.

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.

References

References

  1. "NGC4565 at".
  2. Spiral Galaxy NGC 4565 at http://www.eso.org/public/images/eso0525a/
  3. Seligman, Courtney. "New General Catalogue Objects: NGC 4565".
  4. (1991). "Globular cluster systems in galaxies beyond the Local Group". Annual Review of Astronomy and Astrophysics.
  5. (2002). "Intermediate-band surface photometry of the edge-on galaxy NGC 4565". The Astronomical Journal.
  6. [http://adsabs.harvard.edu/abs/2009ASPC..419..149B Detection of a Distinct Pseudobulge Hidden Inside the ''Box-Shaped Bulge'' of NGC 4565]
  7. (1937). "A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems". Annals of the Observatory of Lund.
  8. [http://adsabs.harvard.edu/abs/2012ApJ...760...37Z HALOGAS: H I Observations and Modeling of the Nearby Edge-on Spiral Galaxy NGC 4565]
  9. "Webb Deep-Sky Society: Galaxy of the Month: NGC4565".
  10. (April 1977). "The Coma i Galaxy Cloud". The Astrophysical Journal.
  11. "NGC 4565 - Needle Galaxy".
Info: Wikipedia Source

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