NGC 6907

NGC 6907 is a spiral galaxy located in the constellation Capricornus. It is located at a distance of circa 120 million light years from Earth, which, given its apparent dimensions, means that NGC 6907 is about 115,000 light years across. It was discovered by William Herschel on July 12, 1784.[4] The total infrared luminosity of the galaxy is 1011.03 L☉, and thus it is categorised as a luminous infrared galaxy.[5]

NGC 6907
NGC 6907 by GALEX
Observation data (J2000 epoch)
ConstellationCapricornus
Right ascension 20h 25m 06.6s[1]
Declination−24° 48′ 33″[1]
Redshift0.010614 ± 0.000013 [1]
Helio radial velocity3,182 ± 4 km/s[1]
Distance118 Mly (36.3 Mpc)[2]
Apparent magnitude (V)11.1[3]
Characteristics
TypeSB(s)bc [1]
Apparent size (V)3′.3 × 2′.7[1]
Notable featuresLuminous infrared galaxy
Other designations
UGCA 418, ESO 528- G003, MCG -04-48-006, IRAS 20221-2458, PGC 64650[1]

Characteristics
NGC 6907 by 2MASS. NGC 6908 can be seen at the eastern arm.

NGC 6907 is a grand design spiral galaxy with two spiral arms. It has an elliptical bulge that is skewed towards the base of the arms. The inner arms are bright and with knots, forming a bar.[6] There are dust lanes in the arms. The disk of NGC 6907 is asymmetric. The eastern arm changes pitch angle and becomes linear after the location of the nearby galaxy NGC 6908. The western arm is less strong, but it is considerably longer, as its outermost parts form an arc with HII regions, wrapping nearly 360 degrees around the disk and forming a pseudoring. NGC 6907 also has a tidal tail with low surface brightness. The asymmetric tail extends from the north part of the disk of the galaxy towards the west and southwest. Its presence is an indicator of an ongoing unequal mass merger.[7] The total HI mass of NGC 6907 is estimated to be (8.3±0.4)×109 M☉.[8]

NGC 6907 interacts with a low luminosity lenticular galaxy, known as NGC 6908, that is superimposed on the eastern arm of NGC 6907, lying 40 arcseconds off the nucleus of NGC 6907. NGC 6908 was thought for many years to be actually part of NGC 6907, which was described as having two massive asymmetric arms, however when observed in infrared, it becomes apparent NGC 6908 is a different galaxy.[7] As NGC 6908 passed through the disk of NGC 6907, a stellar and gas bridge was formed between the two galaxies that has been observed as high velocity gas. It is estimated that NGC 6908 passed through the disk approximately 35 million years ago.[8]

Nearby galaxies

NGC 6907 is the more prominent member of a small galaxy group known as the NGC 6907 group or LGG 436. Other members of the group, apart from NGC 6908, include IC 4999 and IC 5005.[9][10] These two galaxies lie 61 and 74 arcminutes off NGC 6907 respectively. The group seems to form, with some other galaxies lying at similar redshift, like ESO 462- G016, a sheet of galaxies that extends 10 degrees in the sky, which corresponds to 7 Mpc at the distance of NGC 6907.[7]

Supernovae

NGC 6907 has been home to four supernovae in the last 35 years; SN 1984V (mag 15.0), SN 2004bv (type Ia, mag 15.6), SN 2008fq (Type II, mag 15.4), and SN 2014eh (Type Ic, mag 16.0).[11][12]

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See also
  • NGC 1097, another spiral galaxy with a smaller companion

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 6907. Retrieved 2016-01-18.
  2. Tully, R. Brent; Courtois, Hélène M.; Dolphin, Andrew E.; Fisher, J. Richard; Héraudeau, Philippe; Jacobs, Bradley A.; Karachentsev, Igor D.; Makarov, Dmitry; Makarova, Lidia; Mitronova, Sofia; Rizzi, Luca; Shaya, Edward J.; Sorce, Jenny G.; Wu, Po-Feng (5 September 2013). "Cosmicflows-2: The Data". The Astronomical Journal. 146 (4): 86. arXiv:1307.7213. Bibcode:2013AJ....146...86T. doi:10.1088/0004-6256/146/4/86.
  3. "Revised NGC Data for NGC 6907". spider.seds.org. Retrieved 25 November 2018.
  4. Seligman, Courtney. "NGC 6907 (= PGC 64650)". Celestial Atlas. Retrieved 19 November 2018.
  5. Sanders, D. B.; Mazzarella, J. M.; Kim, D.-C.; Surace, J. A.; Soifer, B. T. (October 2003). "The IRAS Revised Bright Galaxy Sample". The Astronomical Journal. 126 (4): 1607–1664. arXiv:astro-ph/0306263. Bibcode:2003AJ....126.1607S. doi:10.1086/376841.
  6. Eskridge, Paul B.; Frogel, Jay A.; Pogge, Richard W.; Quillen, Alice C.; Berlind, Andreas A.; Davies, Roger L.; DePoy, D. L.; Gilbert, Karoline M.; Houdashelt, Mark L.; Kuchinski, Leslie E.; Ramirez, Solange V.; Sellgren, K.; Stutz, Amelia; Terndrup, Donald M.; Tiede, Glenn P. (November 2002). "Near‐Infrared and Optical Morphology of Spiral Galaxies". The Astrophysical Journal Supplement Series. 143 (1): 73–111. arXiv:astro-ph/0206320. Bibcode:2002ApJS..143...73E. doi:10.1086/342340.
  7. Madore, Barry F.; Gil de Paz, Armando; Pevunova, Olga; Thompson, Ian (July 2007). "The Curious Case of NGC 6908". The Astronomical Journal. 134 (1): 314–320. arXiv:0704.3813. Bibcode:2007AJ....134..314M. doi:10.1086/518557.
  8. Scarano, S.; Madsen, Felipe R. H.; Roy, Nirupam; Lépine, J. R. D. (May 2008). "H i aperture synthesis and optical observations of the pair of galaxies NGC 6907 and 6908". Monthly Notices of the Royal Astronomical Society. 386 (2): 963–972. arXiv:0802.1713. Bibcode:2008MNRAS.386..963S. doi:10.1111/j.1365-2966.2008.13079.x.
  9. Makarov, Dmitry; Karachentsev, Igor (21 April 2011). "Galaxy groups and clouds in the local (z∼ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv:1011.6277. Bibcode:2011MNRAS.412.2498M. doi:10.1111/j.1365-2966.2010.18071.x.
  10. Garcia, A. M. (1993). "General study of group membership. II - Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100 (1): 47–90. Bibcode:1993A&AS..100...47G. ISSN 0365-0138.
  11. List of Supernovae IAU Central Bureau for Astronomical Telegrams. Retrieved 29 December 2015.
  12. "Bright Supernova pages - Most prolific galaxies". www.rochesterastronomy.org.
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