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== Characteristics ==
== Characteristics ==
NGC 7184 has a small, bright nucleus and an elliptical [[galaxy bulge|bulge]], whose major axis is aligned with the major axis of the disk. There is a bar along the minor axis of the bulge but the high inclination of the galaxy makes its presence uncertain. From the bar emanate two tightly wood symmetrical [[spiral arm]]s that form a bright inner ring.<ref>{{cite journal |last1=Eskridge |first1=Paul B. |last2=Frogel |first2=Jay A. |last3=Pogge |first3=Richard W. |last4=Quillen |first4=Alice C. |last5=Berlind |first5=Andreas A. |last6=Davies |first6=Roger L. |last7=DePoy |first7=D. L. |last8=Gilbert |first8=Karoline M. |last9=Houdashelt |first9=Mark L. |last10=Kuchinski |first10=Leslie E. |last11=Ramirez |first11=Solange V. |last12=Sellgren |first12=K. |last13=Stutz |first13=Amelia |last14=Terndrup |first14=Donald M. |last15=Tiede |first15=Glenn P. |title=Near‐Infrared and Optical Morphology of Spiral Galaxies |journal=The Astrophysical Journal Supplement Series |date=November 2002 |volume=143 |issue=1 |pages=73–111 |doi=10.1086/342340}}</ref> The diametre of the ring along its major axis is 1.71 arcminutes.<ref>{{cite journal |last1=Comerón |first1=S. |last2=Salo |first2=H. |last3=Laurikainen |first3=E. |last4=Knapen |first4=J. H. |last5=Buta |first5=R. J. |last6=Herrera-Endoqui |first6=M. |last7=Laine |first7=J. |last8=Holwerda |first8=B. W. |last9=Sheth |first9=K. |last10=Regan |first10=M. W. |last11=Hinz |first11=J. L. |last12=Muñoz-Mateos |first12=J. C. |last13=Gil de Paz |first13=A. |last14=Menéndez-Delmestre |first14=K. |last15=Seibert |first15=M. |last16=Mizusawa |first16=T. |last17=Kim |first17=T. |last18=Erroz-Ferrer |first18=S. |last19=Gadotti |first19=D. A. |last20=Athanassoula |first20=E. |last21=Bosma |first21=A. |last22=Ho |first22=L. C. |title=ARRAKIS: atlas of resonance rings as known in the S4G |journal=Astronomy & Astrophysics |date=19 February 2014 |volume=562 |pages=A121 |doi=10.1051/0004-6361/201321633}}</ref> The arms feature [[HII region]]s and as they emerge from the ring are flocculent, based on the HII distribution, while they begin to split again at the outermost part of the galaxy.<ref>{{cite journal |last1=Meurer |first1=Gerhardt R. |last2=Hanish |first2=D. J. |last3=Ferguson |first3=H. C. |last4=Knezek |first4=P. M. |last5=Kilborn |first5=V. A. |last6=Putman |first6=M. E. |last7=Smith |first7=R. C. |last8=Koribalski |first8=B. |last9=Meyer |first9=M. |last10=Oey |first10=M. S. |last11=Ryan‐Weber |first11=E. V. |last12=Zwaan |first12=M. A. |last13=Heckman |first13=T. M. |last14=Kennicutt, Jr. |first14=R. C. |last15=Lee |first15=J. C. |last16=Webster |first16=R. L. |last17=Bland‐Hawthorn |first17=J. |last18=Dopita |first18=M. A. |last19=Freeman |first19=K. C. |last20=Doyle |first20=M. T. |last21=Drinkwater |first21=M. J. |last22=Staveley‐Smith |first22=L. |last23=Werk |first23=J. |title=The Survey for Ionization in Neutral Gas Galaxies. I. Description and Initial Results |journal=The Astrophysical Journal Supplement Series |date=July 2006 |volume=165 |issue=1 |pages=307–337 |doi=10.1086/504685}}</ref> Dust lanes are observed in the inner part of the disk.<ref name=Carnegie>Sandage, A., Bedke, J. (1994), ''The Carnegie Atlas of Galaxies. Volume I'', Carnegie Institution of Washington</ref>
NGC 7184 has a small, bright nucleus and an elliptical [[galaxy bulge|bulge]], whose major axis is aligned with the major axis of the disk. There is a bar along the minor axis of the bulge but the high inclination of the galaxy makes its presence uncertain. From the bar emanate two tightly wood symmetrical [[spiral arm]]s that form a bright inner ring.<ref>{{cite journal |last1=Eskridge |first1=Paul B. |last2=Frogel |first2=Jay A. |last3=Pogge |first3=Richard W. |last4=Quillen |first4=Alice C. |last5=Berlind |first5=Andreas A. |last6=Davies |first6=Roger L. |last7=DePoy |first7=D. L. |last8=Gilbert |first8=Karoline M. |last9=Houdashelt |first9=Mark L. |last10=Kuchinski |first10=Leslie E. |last11=Ramirez |first11=Solange V. |last12=Sellgren |first12=K. |last13=Stutz |first13=Amelia |last14=Terndrup |first14=Donald M. |last15=Tiede |first15=Glenn P. |title=Near‐Infrared and Optical Morphology of Spiral Galaxies |journal=The Astrophysical Journal Supplement Series |date=November 2002 |volume=143 |issue=1 |pages=73–111 |doi=10.1086/342340}}</ref> The diametre of the ring along its major axis is 1.71 arcminutes.<ref>{{cite journal |last1=Comerón |first1=S. |last2=Salo |first2=H. |last3=Laurikainen |first3=E. |last4=Knapen |first4=J. H. |last5=Buta |first5=R. J. |last6=Herrera-Endoqui |first6=M. |last7=Laine |first7=J. |last8=Holwerda |first8=B. W. |last9=Sheth |first9=K. |last10=Regan |first10=M. W. |last11=Hinz |first11=J. L. |last12=Muñoz-Mateos |first12=J. C. |last13=Gil de Paz |first13=A. |last14=Menéndez-Delmestre |first14=K. |last15=Seibert |first15=M. |last16=Mizusawa |first16=T. |last17=Kim |first17=T. |last18=Erroz-Ferrer |first18=S. |last19=Gadotti |first19=D. A. |last20=Athanassoula |first20=E. |last21=Bosma |first21=A. |last22=Ho |first22=L. C. |title=ARRAKIS: atlas of resonance rings as known in the S4G |journal=Astronomy & Astrophysics |date=19 February 2014 |volume=562 |pages=A121 |doi=10.1051/0004-6361/201321633}}</ref> The arms feature [[HII region]]s and as they emerge from the ring are flocculent, based on the HII distribution, while they begin to split again at the outermost part of the galaxy.<ref>{{cite journal |last1=Meurer |first1=Gerhardt R. |last2=Hanish |first2=D. J. |last3=Ferguson |first3=H. C. |last4=Knezek |first4=P. M. |last5=Kilborn |first5=V. A. |last6=Putman |first6=M. E. |last7=Smith |first7=R. C. |last8=Koribalski |first8=B. |last9=Meyer |first9=M. |last10=Oey |first10=M. S. |last11=Ryan‐Weber |first11=E. V. |last12=Zwaan |first12=M. A. |last13=Heckman |first13=T. M. |last14=Kennicutt, Jr. |first14=R. C. |last15=Lee |first15=J. C. |last16=Webster |first16=R. L. |last17=Bland‐Hawthorn |first17=J. |last18=Dopita |first18=M. A. |last19=Freeman |first19=K. C. |last20=Doyle |first20=M. T. |last21=Drinkwater |first21=M. J. |last22=Staveley‐Smith |first22=L. |last23=Werk |first23=J. |title=The Survey for Ionization in Neutral Gas Galaxies. I. Description and Initial Results |journal=The Astrophysical Journal Supplement Series |date=July 2006 |volume=165 |issue=1 |pages=307–337 |doi=10.1086/504685}}</ref> Dust lanes are observed in the inner part of the disk.<ref name=Carnegie>Sandage, A., Bedke, J. (1994), ''The Carnegie Atlas of Galaxies. Volume I'', Carnegie Institution of Washington</ref>

An outlying HII region has been discovered near NGC 7184. It is located on the major axis of the optical disk, on the northeasterly receding edge. Its size is estimated to be 270 pc at the distance of the galaxy and its [[H-alpha|Hα]] luminosity, 10<sup>37.6</sup> erg s−1. It could be an isolated extension of a spiral arm.<ref>{{cite journal |last1=Werk |first1=J. K. |last2=Putman |first2=M. E. |last3=Meurer |first3=G. R. |last4=Ryan-Weber |first4=E. V. |last5=Kehrig |first5=C. |last6=Thilker |first6=D. A. |last7=Bland-Hawthorn |first7=J. |last8=Drinkwater |first8=M. J. |last9=Kennicutt |first9=R. C. |last10=Wong |first10=O. I. |last11=Freeman |first11=K. C. |last12=Oey |first12=M. S. |last13=Dopita |first13=M. A. |last14=Doyle |first14=M. T. |last15=Ferguson |first15=H. C. |last16=Hanish |first16=D. J. |last17=Heckman |first17=T. M. |last18=Kilborn |first18=V. A. |last19=Kim |first19=J. H. |last20=Knezek |first20=P. M. |last21=Koribalski |first21=B. |last22=Meyer |first22=M. |last23=Smith |first23=R. C. |last24=Zwaan |first24=M. A. |title=OUTLYING H II REGIONS IN H I-SELECTED GALAXIES |journal=The Astronomical Journal |date=1 January 2010 |volume=139 |issue=1 |pages=279–295 |doi=10.1088/0004-6256/139/1/279}}</ref>


== Supernova ==
== Supernova ==
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== Nearby galaxies ==
== Nearby galaxies ==
NGC 7184 is the foremost galaxy of a small [[galaxy group]] known as the NGC 7184 group, which also includes [[NGC 7183]].<ref name=Makarov>{{cite journal|last1=Makarov|first1=Dmitry|last2=Karachentsev|first2=Igor|title=Galaxy groups and clouds in the local (z∼ 0.01) Universe|journal=Monthly Notices of the Royal Astronomical Society|date=21 April 2011|volume=412|issue=4|pages=2498–2520|doi=10.1111/j.1365-2966.2010.18071.x|url=http://www.sao.ru/hq/dim/groups/galaxies.dat|bibcode=2011MNRAS.412.2498M|arxiv = 1011.6277 }}</ref>
NGC 7184 is the foremost galaxy of a small [[galaxy group]] known as the NGC 7184 group, which also includes [[NGC 7183]].<ref name=Makarov>{{cite journal|last1=Makarov|first1=Dmitry|last2=Karachentsev|first2=Igor|title=Galaxy groups and clouds in the local (z∼ 0.01) Universe|journal=Monthly Notices of the Royal Astronomical Society|date=21 April 2011|volume=412|issue=4|pages=2498–2520|doi=10.1111/j.1365-2966.2010.18071.x|url=http://www.sao.ru/hq/dim/groups/galaxies.dat|bibcode=2011MNRAS.412.2498M|arxiv = 1011.6277 }}</ref> A satellite galaxy lies 3 arcminutes to the south, at projected separation of 28 kpc.<ref>{{cite journal |last1=Zaritsky |first1=Dennis |last2=Smith |first2=Rodney |last3=Frenk |first3=Carlos |last4=White |first4=Simon D. M. |title=More Satellites of Spiral Galaxies |journal=The Astrophysical Journal |date=20 March 1997 |volume=478 |issue=1 |pages=39–48 |doi=10.1086/303784}}</ref>


== References ==
== References ==

Revision as of 01:09, 13 December 2018

NGC 7184
NGC 7184 by Adam Block/Mount Lemmon SkyCenter
Observation data (J2000 epoch)
ConstellationAquarius
Right ascension22h 02m 39.8s[1]
Declination−20° 48′ 46″[1]
Redshift0.008739 +/- 0.000010 [1]
Heliocentric radial velocity2620 ± 3 km/s[1]
Distance99.3 ± 22.5 Mly (30.5 ± 6.9 Mpc)[1]
Apparent magnitude (V)11.1
Characteristics
TypeSB(r)c [1]
Apparent size (V)6′.0 × 1′.5[1]
Other designations
UGCA 425, ESO 601- G009, MCG -04-52-009, PGC 67904[1]

NGC 7184 is a barred spiral galaxy located in the constellation Aquarius. It is located at a distance of circa 100 million light years from Earth, which, given its apparent dimensions, means that NGC 7184 is about 175,000 light years across. It was discovered by William Herschel on October 28, 1783.[2]

Characteristics

NGC 7184 has a small, bright nucleus and an elliptical bulge, whose major axis is aligned with the major axis of the disk. There is a bar along the minor axis of the bulge but the high inclination of the galaxy makes its presence uncertain. From the bar emanate two tightly wood symmetrical spiral arms that form a bright inner ring.[3] The diametre of the ring along its major axis is 1.71 arcminutes.[4] The arms feature HII regions and as they emerge from the ring are flocculent, based on the HII distribution, while they begin to split again at the outermost part of the galaxy.[5] Dust lanes are observed in the inner part of the disk.[6]

An outlying HII region has been discovered near NGC 7184. It is located on the major axis of the optical disk, on the northeasterly receding edge. Its size is estimated to be 270 pc at the distance of the galaxy and its Hα luminosity, 1037.6 erg s−1. It could be an isolated extension of a spiral arm.[7]

Supernova

One supernova has been observed in NGC 7184, SN 1984N. It was discovered visually by R. Evans at magnitude 14, 60" east and 65" north of the nucleus on July 20, 1984. Its discovery was confirmed by T. Cragg at the Anglo-Australian Observatory.[8] Initially was thought to be a variable star in our galaxy[9] but later study of the object revealed it was indeed a supernova.[10][11] It was identified as type I.[12]

Nearby galaxies

NGC 7184 is the foremost galaxy of a small galaxy group known as the NGC 7184 group, which also includes NGC 7183.[13] A satellite galaxy lies 3 arcminutes to the south, at projected separation of 28 kpc.[14]

References

  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 7184. Retrieved 2016-01-18.
  2. ^ Seligman, Courtney. "NGC 7184". Celestial Atlas. Retrieved 19 November 2018.
  3. ^ 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. doi:10.1086/342340.
  4. ^ Comerón, S.; Salo, H.; Laurikainen, E.; Knapen, J. H.; Buta, R. J.; Herrera-Endoqui, M.; Laine, J.; Holwerda, B. W.; Sheth, K.; Regan, M. W.; Hinz, J. L.; Muñoz-Mateos, J. C.; Gil de Paz, A.; Menéndez-Delmestre, K.; Seibert, M.; Mizusawa, T.; Kim, T.; Erroz-Ferrer, S.; Gadotti, D. A.; Athanassoula, E.; Bosma, A.; Ho, L. C. (19 February 2014). "ARRAKIS: atlas of resonance rings as known in the S4G". Astronomy & Astrophysics. 562: A121. doi:10.1051/0004-6361/201321633.
  5. ^ Meurer, Gerhardt R.; Hanish, D. J.; Ferguson, H. C.; Knezek, P. M.; Kilborn, V. A.; Putman, M. E.; Smith, R. C.; Koribalski, B.; Meyer, M.; Oey, M. S.; Ryan‐Weber, E. V.; Zwaan, M. A.; Heckman, T. M.; Kennicutt, Jr., R. C.; Lee, J. C.; Webster, R. L.; Bland‐Hawthorn, J.; Dopita, M. A.; Freeman, K. C.; Doyle, M. T.; Drinkwater, M. J.; Staveley‐Smith, L.; Werk, J. (July 2006). "The Survey for Ionization in Neutral Gas Galaxies. I. Description and Initial Results". The Astrophysical Journal Supplement Series. 165 (1): 307–337. doi:10.1086/504685.
  6. ^ Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington
  7. ^ Werk, J. K.; Putman, M. E.; Meurer, G. R.; Ryan-Weber, E. V.; Kehrig, C.; Thilker, D. A.; Bland-Hawthorn, J.; Drinkwater, M. J.; Kennicutt, R. C.; Wong, O. I.; Freeman, K. C.; Oey, M. S.; Dopita, M. A.; Doyle, M. T.; Ferguson, H. C.; Hanish, D. J.; Heckman, T. M.; Kilborn, V. A.; Kim, J. H.; Knezek, P. M.; Koribalski, B.; Meyer, M.; Smith, R. C.; Zwaan, M. A. (1 January 2010). "OUTLYING H II REGIONS IN H I-SELECTED GALAXIES". The Astronomical Journal. 139 (1): 279–295. doi:10.1088/0004-6256/139/1/279.
  8. ^ "IAUC 3962: Prob. SN IN NGC 7184; APPULSE OF SAO 186001 TO NEPTUNE; JUPITER I (IO)". www.cbat.eps.harvard.edu.
  9. ^ "IAUC 3994: 1983 TB; SN IN NGC 7184?". www.cbat.eps.harvard.edu.
  10. ^ "IAUC 3995: Poss. N IN Sgr; EDITORIAL NOTICE; 1984o". www.cbat.eps.harvard.edu.
  11. ^ "IAUC 4013: 1984t; SN IN NGC 7184". www.cbat.eps.harvard.edu.
  12. ^ Spratt, C. E. (1987). "Visually discovered extra-galactic supernovae". Journal of the American Association of Variable Star Observers. 16 (1): 19-22.
  13. ^ 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.
  14. ^ Zaritsky, Dennis; Smith, Rodney; Frenk, Carlos; White, Simon D. M. (20 March 1997). "More Satellites of Spiral Galaxies". The Astrophysical Journal. 478 (1): 39–48. doi:10.1086/303784.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=NGC_7184&oldid=873410780"