NGC 4491

Last updated
NGC 4491
SDSS NGC 4491.jpg
SDSS image of NGC 4491.
Observation data (J2000 epoch)
Constellation Virgo
Right ascension 12h 30m 57.1s [1]
Declination 11° 29′ 01″ [1]
Redshift 0.001658/497 km/s [1]
Distance 55,420,000 ly [2]
Group or cluster Virgo Cluster
Apparent magnitude  (V)13.5 [1]
Characteristics
Type SB(s)a [1]
Size~7,140 ly (estimated) [1]
Apparent size  (V)1.7 x 0.9 [1]
Other designations
PGC 41376, UGC 7657, VCC 1326 [1]

NGC 4491 is a dwarf barred spiral galaxy [2] located about 55 million light-years away [3] in the constellation Virgo. [4] NGC 4491 was discovered by astronomer William Herschel on March 15, 1784. [5] NGC 4491 is located in a subgroup of the Virgo Cluster centered on Messier 87 known as the Virgo A subgroup. [2]

Contents

Tidal interactions

NGC 4491 is a strongly barred galaxy. The bar may have grown from the tidal influence of other galaxies in the Virgo Cluster. [2]

Possible Seyfert activity

The infrared-radio properties of NGC 4491 possibly suggest the presence of an AGN in the galaxy. However, spectral analysis of the galaxy does not support this view since emission lines are absent or very weak and narrow. [2]

See also

Related Research Articles

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<span class="mw-page-title-main">NGC 4733</span> Galaxy in the constellation Virgo

NGC 4733 is a barred lenticular galaxy located about 55 million light-years away in the constellation of Virgo. NGC 4733 was discovered by astronomer William Herschel on March 15, 1784. NGC 4733 is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 4612</span> Galaxy in the constellation Virgo

NGC 4612 is a barred lenticular galaxy located about 57 million light-years away in the constellation of Virgo. NGC 4612 was discovered by astronomer William Herschel on January 23, 1784. The galaxy is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 4633</span> Galaxy in the constellation Coma Berenices

NGC 4633 is a spiral galaxy located about 70 million light-years away in the constellation of Coma Berenices. It is interacting with the nearby galaxy NGC 4634. NGC 4633 was discovered by astronomer Edward D. Swift on April 27, 1887. It was rediscovered on November 23, 1900, by astronomer Arnold Schwassmann and was later listed as IC 3688. NGC 4633 is a member of the Virgo Cluster.

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<span class="mw-page-title-main">NGC 4907</span> Barred spiral galaxy in the constellation Coma Berenices

NGC 4907 is a barred spiral galaxy located about 270 million light-years away in the constellation of Coma Berenices. It is also classified as a LINER galaxy. NGC 4907 was discovered by astronomer Heinrich d'Arrest on May 5, 1864. The galaxy is a member of the Coma Cluster, located equidistant between NGC 4928 and NGC 4829.

<span class="mw-page-title-main">NGC 4689</span> Galaxy in the constellation Coma Berenices

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<span class="mw-page-title-main">NGC 4440</span> Galaxy in the constellation Virgo

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<span class="mw-page-title-main">NGC 4606</span> Spiral galaxy in the constellation Virgo

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<span class="mw-page-title-main">NGC 4469</span> Spiral galaxy in the constellation of Virgo

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<span class="mw-page-title-main">NGC 4436</span> Lenticular or dwarf irregular galaxy in the constellation Virgo

NGC 4436 is a lenticular or dwarf elliptical galaxy located about 60 million light-years away in the constellation of Virgo. NGC 4436 was discovered by astronomer William Herschel on April 17, 1784. The galaxy is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 4476</span> Galaxy in the constellation of Virgo

NGC 4476 is a lenticular galaxy located about 55 million light-years away in the constellation Virgo. NGC 4476 was discovered by astronomer William Herschel on April 12, 1784. The galaxy is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 4482</span> Galaxy in the constellation of Virgo

NGC 4482 is a dwarf elliptical galaxy located about 60 million light-years away in the constellation Virgo. NGC 4482 was discovered by astronomer William Herschel on March 15, 1784. It was rediscovered by astronomer Arnold Schwassmann on September 6, 1900 and was listed as IC 3427. It is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 4492</span> Spiral galaxy in the constellation Virgo

NGC 4492 is a spiral galaxy located about 90 million light-years away in the constellation Virgo. NGC 4492 was discovered by astronomer William Herschel on December 28, 1785. It was rediscovered by astronomer Arnold Schwassmann on January 23, 1900, and was listed as IC 3438. NGC 4492 lies in the direction of the Virgo Cluster. However, it is not considered to be a member of that cluster.

<span class="mw-page-title-main">NGC 4498</span> Galaxy in the constellation Coma Berenices

NGC 4498 is a barred spiral galaxy located about 50 million light-years away in the constellation Coma Berenices. NGC 4498 was discovered by astronomer William Herschel on March 21, 1784. NGC 4498 is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 4503</span> Galaxy in the constellation of Virgo

NGC 4503 is a barred lenticular galaxy located around 41 to 74 million light-years away in the constellation Virgo. NGC 4503 was discovered by astronomer William Herschel on March 15, 1784. NGC 4503 is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 4506</span> Galaxy in the constellation Coma Berenices

NGC 4506 is a spiral galaxy located around 50 million light-years away in the constellation Coma Berenices. It is classified as peculiar due to the presence of dust that surrounds its nucleus. NGC 4506 was discovered by astronomer William Herschel on January 14, 1787. It is a member of the Virgo Cluster.

References

  1. 1 2 3 4 5 6 7 8 "NASA/IPAC Extragalactic Database". Results for NGC 4491. Retrieved 2017-10-21.
  2. 1 2 3 4 5 Roussel, H.; Helou, G.; Beck, R.; Condon, J. J.; Bosma, A.; Matthews, K.; Jarrett, T. H. (2 May 2003). "Nascent Starbursts in Synchrotron‐deficient Galaxies with Hot Dust". The Astrophysical Journal. 593 (2): 733–759. arXiv: astro-ph/0305046 . Bibcode:2003ApJ...593..733R. doi:10.1086/376691. S2CID   122402426.
  3. ↑ "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-10-22.
  4. ↑ Rojas, Sebastián García. "Galaxy NGC 4491 - Barred Spiral Galaxy in Virgo Constellation · Deep Sky Objects Browser". DSO Browser. Retrieved 2017-10-22.
  5. ↑ "New General Catalog Objects: NGC 4450 - 4499". cseligman.com. Retrieved 2017-10-08.


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