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  • 21 Aug, 2019

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NGC 6503
NGC 6503 is a field dwarf spiral galaxy in the northern constellation of Draco. It was discovered by German astronomer Arthur von Auwers on July 22, 1854. The galaxy has an angular size of 7.1′ × 2.4′ and an apparent visual magnitude of 10.2. It is located at a distance of approximately 20.9 million light-years (6.40 Mpc) from the Milky Way galaxy. NGC 6503 may form the remote tip of a long chain of galaxies that extends out into the local void, forming a galaxy filament spanning 26 million light-years (8 Mpc).

The galactic plane of this galaxy is inclined at an angle of 78°±3° to the plane of the sky, with the major axis of its oval profile being aligned along a position angle of 121°. The morphological classification of NGC 6502 is SAB:(s)bc. This indicates a barred spiral galaxy (SAB:) with no inner ring structure (s) and moderately wound spiral arms (bc). However, the ':' notation indicates some uncertainty about the classification. Older works gave it a class of SA(s)bc; i.e. no bar.

A possible bar system has been reported via infrared observations, being viewed end-on from the perspective of the Earth. Ultraviolet observations show a young, inner star forming ring encircling the bar. The ring has a radius between 1 and 2.5 kpc from the core. There is a disk of neutral hydrogen that is larger in extent than the optical disk of the galaxy. This extra-planar gas is mostly the result of star formation activity, rather than cold gas that is being accreted. There is evidence for a LINER-type or Seyfert 2 nucleus.

NGC 6503 has one known satellite galaxy, known as KK 242. With a stellar mass of about 3 million solar masses, KK 242 is on the border between a dwarf irregular galaxy (dIrr) and a dwarf spheroidal galaxy (dSph).

References

  1. ^ "NGC 6503". space telescope.org. NASA/ESA. Retrieved 11 June 2015.
  2. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ "NGC 6503". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-11-29.
  4. ^ Kourkchi, Ehsan; et al. (October 23, 2020). "Cosmicflows-4: The Catalog of ∼10,000 Tully–Fisher Distances". The Astrophysical Journal. 902 (2): 145. arXiv:2009.00733. Bibcode:2020ApJ...902..145K. doi:10.3847/1538-4357/abb66b. ISSN 1538-4357.
  5. ^ O'Meara, Stephen James (2007). Hidden Treasures. Cambridge University Press. p. 423. ISBN 978-1-139-46373-7.
  6. ^ Buta, Ronald J.; et al. (2015). "A Classical Morphological Analysis of Galaxies in the Spitzer Survey of Stellar Structure in Galaxies (S4G)". The Astrophysical Journal Supplement Series. 217 (2): 32. arXiv:1501.00454. Bibcode:2015ApJS..217...32B. doi:10.1088/0067-0049/217/2/32. S2CID 119202943.
  7. ^ Blanc, Guillermo A.; et al. (2013). "The Virus-P Exploration of Nearby Galaxies (Venga): Survey Design, Data Processing, and Spectral Analysis Methods". The Astronomical Journal. 145 (5): 138. arXiv:1303.1552. Bibcode:2013AJ....145..138B. doi:10.1088/0004-6256/145/5/138. S2CID 119109864.
  8. ^ Materne, J. (April 1979). "The structure of nearby groups of galaxies - Quantitative membership probabilities". Astronomy and Astrophysics. 74 (2): 235–243. Bibcode:1979A&A....74..235M.
  9. ^ Karachentseva, Valentina E.; et al. (October 2023). "The M 101 galaxy group as a node in a nearby cosmic filament". Astronomy & Astrophysics. 678. id. A16. arXiv:2308.01897. Bibcode:2023A&A...678A..16K. doi:10.1051/0004-6361/202347085.
  10. ^ Bottema, Roelof; Gerritsen, Jeroen P. E. (October 1997). "An investigation of the structure and kinematics of the spiral galaxy NGC 6503". Monthly Notices of the Royal Astronomical Society. 290 (4): 585–597. arXiv:astro-ph/9704190. doi:10.1093/mnras/290.4.585.
  11. ^ Kuzio de Naray, Rachel; et al. (December 2012). "Searching for non-axisymmetries in NGC 6503: a weak end-on bar". Monthly Notices of the Royal Astronomical Society. 427 (3): 2523–2536. arXiv:1209.4653. Bibcode:2012MNRAS.427.2523K. doi:10.1111/j.1365-2966.2012.22126.x.
  12. ^ Freeland, E.; Chomiuk, L.; Keenan, R.; Nelson, T. (March 2010). "Evidence for a Strong End-On Bar in the Ringed σ-Drop Galaxy NGC 6503". The Astronomical Journal. 139 (3): 865–870. arXiv:0912.0247. Bibcode:2010AJ....139..865F. doi:10.1088/0004-6256/139/3/865.
  13. ^ Gouliermis, Dimitrios A.; et al. (October 2015). "Hierarchical star formation across the ring galaxy NGC 6503". Monthly Notices of the Royal Astronomical Society. 452 (4): 3508–3528. arXiv:1506.03928. Bibcode:2015MNRAS.452.3508G. doi:10.1093/mnras/stv1325.
  14. ^ Greisen, Eric W.; et al. (June 2009). "Aperture Synthesis Observations of the Nearby Spiral NGC 6503: Modeling the Thin and Thick H I Disks". The Astronomical Journal. 137 (6): 4718–4733. arXiv:0902.0989. Bibcode:2009AJ....137.4718G. doi:10.1088/0004-6256/137/6/4718.
  15. ^ Koda, Jin; et al. (April 2015). "Discovery of New Dwarf Galaxy Near the Isolated Spiral Galaxy NGC 6503". The Astrophysical Journal Letters. 802 (2). id. L24. arXiv:1504.00674. Bibcode:2015ApJ...802L..24K. doi:10.1088/2041-8205/802/2/L24.
  16. ^ Karachentsev, Igor D.; et al. (2022). "KK 242, A Faint Companion to the Isolated SCD Galaxy NGC 6503". The Astronomical Journal. 163 (2): 51. arXiv:2111.14691. Bibcode:2022AJ....163...51K. doi:10.3847/1538-3881/ac3cbe. S2CID 244714422.

Further reading

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