Whirlpool Galaxy (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Whirlpool Galaxy" in English language version.

refsWebsite

Global rank English rank

20harvard.edu

18^th place

17^th place

15doi.org

2^nd place

10arxiv.org

69^th place

59^th place

10semanticscholar.org

11^th place

8^th place

4web.archive.org

1^st place

4nasa.gov

75^th place

83^rd place

2worldcat.org

5^th place

2hubblesite.org

6,632^nd place

7,237^th place

1caltech.edu

887^th place

714^th place

1seds.org

5,388^th place

7,494^th place

1universeforfacts.com

low place

1messierobjects101.com

low place

1hathitrust.org

441^st place

311^th place

1cf.ac.uk

low place

1nih.gov

4^th place

1skyandtelescope.com

8,316^th place

7,545^th place

1supernovae.net

low place

1rochesterastronomy.org

low place

1aavso.org

low place

1astronomerstelegram.org

low place

1wis-tns.org

low place

1bbc.com

20^th place

30^th place

1newscientist.com

774^th place

716^th place

1nature.com

234^th place

397^th place

aavso.org

Kinne (kqr), Richard (2011-06-03). "AAVSO Special Notice #241: New Supernova in M51". AAVSO. Retrieved 2011-06-06.

arxiv.org

Matsushita, Satoki; Muller, Sebastien; Lim, Jeremy (9 April 2007). "Jet-disturbed molecular gas near the Seyfert 2 nucleus in M51". Astronomy & Astrophysics. 468 (A&A Letters Special Issue): L49–L52. arXiv:0704.0947. Bibcode:2007A&A...468L..49M. doi:10.1051/0004-6361:20067039. S2CID 15471799.
Goodwin, S. P.; Gribbin, J.; Hendry, M. A. (22 April 1997). "The Milky Way is just an average spiral". arXiv:astro-ph/9704216.
Castro-Rodríguez, N.; López-Corredoira, M.; Sánchez-Saavedra, M. L.; Battaner, E. (2002). "Warps and correlations with intrinsic parameters of galaxies in the visible and radio". Astronomy & Astrophysics. 391 (2): 519–530. arXiv:astro-ph/0205553. Bibcode:2002A&A...391..519C. doi:10.1051/0004-6361:20020895. S2CID 17813024.
Honig, Z.N.; Reid, M.J. (February 2015). "Characteristics of Spiral Arms in Late-type Galaxies". The Astrophysical Journal. 800 (1): 5387–5394. arXiv:1412.1012. Bibcode:2015ApJ...800...53H. doi:10.1088/0004-637X/800/1/53. PMID 53. S2CID 118666575. Retrieved November 10, 2022.
Watkins, Aaron E.; Mihos, J. Christopher; Harding, Paul (February 2015). "Deep Imaging of M51: a New View of the Whirlpool's Extended Tidal Debris". The Astrophysical Journal. 800 (1): 7. arXiv:1501.04599. Bibcode:2015ApJ...800L...3W. doi:10.1088/2041-8205/800/1/L3. S2CID 118603790. Retrieved November 18, 2022.
Sauer, D. N.; Mazzali, P. A.; Deng, J.; Valenti, S.; et al. (2006). "The properties of the 'standard' Type Ic supernova 1994I from spectral models". Monthly Notices of the Royal Astronomical Society. 369 (4): 1939–1948. arXiv:astro-ph/0604293. Bibcode:2006MNRAS.369.1939S. doi:10.1111/j.1365-2966.2006.10438.x. S2CID 119510845.
Jacob E. Jencson; Scott M. Adams; Howard E. Bond (2019). "Discovery of an intermediate-luminosity red transient in M51 and its likely dust-obscured, infrared-variable progenitor". The Astrophysical Journal Letters. 880 (L20): L20. arXiv:1904.07857. Bibcode:2019ApJ...880L..20J. doi:10.3847/2041-8213/ab2c05. S2CID 119110002.
Di Stefano, Rosanne; Berndtsson, Julia; Urquhart, Ryan; Soria, Roberto; Kashyap, Vinay L.; Carmichael, Theron W.; Imara, Nia (2021-10-25). "A possible planet candidate in an external galaxy detected through X-ray transit". Nature Astronomy. 5 (12): 1297–1307. arXiv:2009.08987. Bibcode:2021NatAs...5.1297D. doi:10.1038/s41550-021-01495-w. ISSN 2397-3366. S2CID 239892362.
Giuricin, G.; Marinoni, C.; Ceriani, L.; Pisani, A. (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal. 543 (1): 178–194. arXiv:astro-ph/0001140. Bibcode:2000ApJ...543..178G. doi:10.1086/317070. S2CID 9618325.
Ferrarese, L.; Ford, H. C.; Huchra, J.; Kennicutt Jr., R. C.; et al. (2000). "A Database of Cepheid Distance Moduli and Tip of the Red Giant Branch, Globular Cluster Luminosity Function, Planetary Nebula Luminosity Function, and Surface Brightness Fluctuation Data Useful for Distance Determinations". Astrophysical Journal Supplement. 128 (2): 431–459. arXiv:astro-ph/9910501. Bibcode:2000ApJS..128..431F. doi:10.1086/313391. S2CID 121612286.

astronomerstelegram.org

"ATEL 3401: Properties of the Candidate Progenitor of SN 2011dh in M51". Astronomers Telegram. 2011-06-03. Retrieved 2011-06-06.

bbc.com

"Signs of first planet found outside our galaxy". BBC News. 2021-10-25. Archived from the original on 2021-10-25.

caltech.edu

ned.ipac.caltech.edu

"NASA/IPAC Extragalactic Database". Results for NGC 5194. Retrieved December 6, 2006.

cf.ac.uk

herschel.cf.ac.uk

"Whirlpool Galaxy". Herschel Space Observatory. Cardiff University. June 19, 2009. Archived from the original on January 10, 2019. Retrieved October 11, 2018.

doi.org

Elmegreen, D. M.; Elmegreen, B. G. (1987). "Arm classifications for spiral galaxies". Astrophysical Journal. 314: 3–9. Bibcode:1987ApJ...314....3E. doi:10.1086/165034.
Arp, H. (1966). "Atlas of Peculiar Galaxies". Astrophysical Journal Supplement. 14: 1. Bibcode:1966ApJS...14....1A. doi:10.1086/190147.
Matsushita, Satoki; Muller, Sebastien; Lim, Jeremy (9 April 2007). "Jet-disturbed molecular gas near the Seyfert 2 nucleus in M51". Astronomy & Astrophysics. 468 (A&A Letters Special Issue): L49–L52. arXiv:0704.0947. Bibcode:2007A&A...468L..49M. doi:10.1051/0004-6361:20067039. S2CID 15471799.
Hubble, E. P. (1929). "A spiral nebula as a stellar system, Messier 31". Astrophysical Journal. 69: 103–158. Bibcode:1929ApJ....69..103H. doi:10.1086/143167.
Castro-Rodríguez, N.; López-Corredoira, M.; Sánchez-Saavedra, M. L.; Battaner, E. (2002). "Warps and correlations with intrinsic parameters of galaxies in the visible and radio". Astronomy & Astrophysics. 391 (2): 519–530. arXiv:astro-ph/0205553. Bibcode:2002A&A...391..519C. doi:10.1051/0004-6361:20020895. S2CID 17813024.
Honig, Z.N.; Reid, M.J. (February 2015). "Characteristics of Spiral Arms in Late-type Galaxies". The Astrophysical Journal. 800 (1): 5387–5394. arXiv:1412.1012. Bibcode:2015ApJ...800...53H. doi:10.1088/0004-637X/800/1/53. PMID 53. S2CID 118666575. Retrieved November 10, 2022.
Salo, Heikki; Laurikainen, Eija (1999). "A Multiple Encounter Model of M51". Astrophysics and Space Science. 269: 663–664. Bibcode:1999Ap&SS.269..663S. doi:10.1023/A:1017002909665. S2CID 189838328.
Watkins, Aaron E.; Mihos, J. Christopher; Harding, Paul (February 2015). "Deep Imaging of M51: a New View of the Whirlpool's Extended Tidal Debris". The Astrophysical Journal. 800 (1): 7. arXiv:1501.04599. Bibcode:2015ApJ...800L...3W. doi:10.1088/2041-8205/800/1/L3. S2CID 118603790. Retrieved November 18, 2022.
Thronson, Harley A.; Greenhouse, Matthew A. (1988). "Near-Infrared Mass-to-light ratios in Galaxies: Stellar Mass and Star Formation in the Heart of the Whirlpool". The Astrophysical Journal. 327: 671–679. Bibcode:1988ApJ...327..671T. doi:10.1086/166224.
Knapen, Johan H.; Beckman, John E.; Cepa, Jordi; van der Hulst, Thijs; Rand, Richard J. (February 1992). "Star Formation Efficiency Patterns in the Spiral Arms of M51". Astrophysical Journal Letters. 385: 4. Bibcode:1992ApJ...385L..37K. doi:10.1086/186272.
Sauer, D. N.; Mazzali, P. A.; Deng, J.; Valenti, S.; et al. (2006). "The properties of the 'standard' Type Ic supernova 1994I from spectral models". Monthly Notices of the Royal Astronomical Society. 369 (4): 1939–1948. arXiv:astro-ph/0604293. Bibcode:2006MNRAS.369.1939S. doi:10.1111/j.1365-2966.2006.10438.x. S2CID 119510845.
Jacob E. Jencson; Scott M. Adams; Howard E. Bond (2019). "Discovery of an intermediate-luminosity red transient in M51 and its likely dust-obscured, infrared-variable progenitor". The Astrophysical Journal Letters. 880 (L20): L20. arXiv:1904.07857. Bibcode:2019ApJ...880L..20J. doi:10.3847/2041-8213/ab2c05. S2CID 119110002.
Di Stefano, Rosanne; Berndtsson, Julia; Urquhart, Ryan; Soria, Roberto; Kashyap, Vinay L.; Carmichael, Theron W.; Imara, Nia (2021-10-25). "A possible planet candidate in an external galaxy detected through X-ray transit". Nature Astronomy. 5 (12): 1297–1307. arXiv:2009.08987. Bibcode:2021NatAs...5.1297D. doi:10.1038/s41550-021-01495-w. ISSN 2397-3366. S2CID 239892362.
Giuricin, G.; Marinoni, C.; Ceriani, L.; Pisani, A. (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal. 543 (1): 178–194. arXiv:astro-ph/0001140. Bibcode:2000ApJ...543..178G. doi:10.1086/317070. S2CID 9618325.
Ferrarese, L.; Ford, H. C.; Huchra, J.; Kennicutt Jr., R. C.; et al. (2000). "A Database of Cepheid Distance Moduli and Tip of the Red Giant Branch, Globular Cluster Luminosity Function, Planetary Nebula Luminosity Function, and Surface Brightness Fluctuation Data Useful for Distance Determinations". Astrophysical Journal Supplement. 128 (2): 431–459. arXiv:astro-ph/9910501. Bibcode:2000ApJS..128..431F. doi:10.1086/313391. S2CID 121612286.

harvard.edu

ui.adsabs.harvard.edu

De Vaucouleurs, Gerard; De Vaucouleurs, Antoinette; Corwin, Herold G.; Buta, Ronald J.; Paturel, Georges; Fouque, Pascal (1991). Third Reference Catalogue of Bright Galaxies. Bibcode:1991rc3..book.....D.
Elmegreen, D. M.; Elmegreen, B. G. (1987). "Arm classifications for spiral galaxies". Astrophysical Journal. 314: 3–9. Bibcode:1987ApJ...314....3E. doi:10.1086/165034.
Arp, H. (1966). "Atlas of Peculiar Galaxies". Astrophysical Journal Supplement. 14: 1. Bibcode:1966ApJS...14....1A. doi:10.1086/190147.
Matsushita, Satoki; Muller, Sebastien; Lim, Jeremy (9 April 2007). "Jet-disturbed molecular gas near the Seyfert 2 nucleus in M51". Astronomy & Astrophysics. 468 (A&A Letters Special Issue): L49–L52. arXiv:0704.0947. Bibcode:2007A&A...468L..49M. doi:10.1051/0004-6361:20067039. S2CID 15471799.
Hubble, E. P. (1929). "A spiral nebula as a stellar system, Messier 31". Astrophysical Journal. 69: 103–158. Bibcode:1929ApJ....69..103H. doi:10.1086/143167.
Goodwin, S. P.; Gribbin, J.; Hendry, M. A. (August 1998). "The relative size of the Milky Way". The Observatory. 118: 201–208. Bibcode:1998Obs...118..201G.
Castro-Rodríguez, N.; López-Corredoira, M.; Sánchez-Saavedra, M. L.; Battaner, E. (2002). "Warps and correlations with intrinsic parameters of galaxies in the visible and radio". Astronomy & Astrophysics. 391 (2): 519–530. arXiv:astro-ph/0205553. Bibcode:2002A&A...391..519C. doi:10.1051/0004-6361:20020895. S2CID 17813024.
Honig, Z.N.; Reid, M.J. (February 2015). "Characteristics of Spiral Arms in Late-type Galaxies". The Astrophysical Journal. 800 (1): 5387–5394. arXiv:1412.1012. Bibcode:2015ApJ...800...53H. doi:10.1088/0004-637X/800/1/53. PMID 53. S2CID 118666575. Retrieved November 10, 2022.
Salo, Heikki; Laurikainen, Eija (1999). "A Multiple Encounter Model of M51". Astrophysics and Space Science. 269: 663–664. Bibcode:1999Ap&SS.269..663S. doi:10.1023/A:1017002909665. S2CID 189838328.
Watkins, Aaron E.; Mihos, J. Christopher; Harding, Paul (February 2015). "Deep Imaging of M51: a New View of the Whirlpool's Extended Tidal Debris". The Astrophysical Journal. 800 (1): 7. arXiv:1501.04599. Bibcode:2015ApJ...800L...3W. doi:10.1088/2041-8205/800/1/L3. S2CID 118603790. Retrieved November 18, 2022.
Thronson, Harley A.; Greenhouse, Matthew A. (1988). "Near-Infrared Mass-to-light ratios in Galaxies: Stellar Mass and Star Formation in the Heart of the Whirlpool". The Astrophysical Journal. 327: 671–679. Bibcode:1988ApJ...327..671T. doi:10.1086/166224.
Knapen, Johan H.; Beckman, John E.; Cepa, Jordi; van der Hulst, Thijs; Rand, Richard J. (February 1992). "Star Formation Efficiency Patterns in the Spiral Arms of M51". Astrophysical Journal Letters. 385: 4. Bibcode:1992ApJ...385L..37K. doi:10.1086/186272.
Sauer, D. N.; Mazzali, P. A.; Deng, J.; Valenti, S.; et al. (2006). "The properties of the 'standard' Type Ic supernova 1994I from spectral models". Monthly Notices of the Royal Astronomical Society. 369 (4): 1939–1948. arXiv:astro-ph/0604293. Bibcode:2006MNRAS.369.1939S. doi:10.1111/j.1365-2966.2006.10438.x. S2CID 119510845.
Jacob E. Jencson; Scott M. Adams; Howard E. Bond (2019). "Discovery of an intermediate-luminosity red transient in M51 and its likely dust-obscured, infrared-variable progenitor". The Astrophysical Journal Letters. 880 (L20): L20. arXiv:1904.07857. Bibcode:2019ApJ...880L..20J. doi:10.3847/2041-8213/ab2c05. S2CID 119110002.
Di Stefano, Rosanne; Berndtsson, Julia; Urquhart, Ryan; Soria, Roberto; Kashyap, Vinay L.; Carmichael, Theron W.; Imara, Nia (2021-10-25). "A possible planet candidate in an external galaxy detected through X-ray transit". Nature Astronomy. 5 (12): 1297–1307. arXiv:2009.08987. Bibcode:2021NatAs...5.1297D. doi:10.1038/s41550-021-01495-w. ISSN 2397-3366. S2CID 239892362.
Fouque, P.; Gourgoulhon, E.; Chamaraux, P.; Paturel, G. (1992). "Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members". Astronomy and Astrophysics Supplement. 93: 211–233. Bibcode:1992A&AS...93..211F.
Garcia, A. (1993). "General study of group membership. II – Determination of nearby groups". Astronomy and Astrophysics Supplement. 100: 47–90. Bibcode:1993A&AS..100...47G.
Giuricin, G.; Marinoni, C.; Ceriani, L.; Pisani, A. (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal. 543 (1): 178–194. arXiv:astro-ph/0001140. Bibcode:2000ApJ...543..178G. doi:10.1086/317070. S2CID 9618325.
Ferrarese, L.; Ford, H. C.; Huchra, J.; Kennicutt Jr., R. C.; et al. (2000). "A Database of Cepheid Distance Moduli and Tip of the Red Giant Branch, Globular Cluster Luminosity Function, Planetary Nebula Luminosity Function, and Surface Brightness Fluctuation Data Useful for Distance Determinations". Astrophysical Journal Supplement. 128 (2): 431–459. arXiv:astro-ph/9910501. Bibcode:2000ApJS..128..431F. doi:10.1086/313391. S2CID 121612286.

cbat.eps.harvard.edu

"List of Supernovae". Central Bureau for Astronomical Telegrams. Retrieved February 27, 2016.

hathitrust.org

babel.hathitrust.org

Rosse revealed the spiral structure of Whirlpool galaxy (M51) at the 1845 meeting of the British Association for the Advancement of Science. Rosse's illustration of M51 was reproduced in J.P. Nichol's book of 1846.
- Rosse, Earl of (1846). "On the nebula 25 Herschel, or 61 [should read: 51] of Messier's catalogue". Report of the Fifteenth Meeting of the British Association for the Advancement of Science; Held at Cambridge in June 1845 § Notices and Abstracts of Miscellaneous Communications to the Sections. Report of the ... Meeting of the British Association for the Advancement of Science (1833): 4.

hubblesite.org

"Hubble Celebrates 15th Anniversary with Spectacular New Images". News Center. HubbleSite. April 25, 2005. Retrieved 13 October 2024.
"NASA's Hubble Space Telescope Resolves a Dark "x" Across the Nucleus of M51". News Center. HubbleSite. June 8, 1992. Retrieved August 7, 2006.

messierobjects101.com

"M 51". Messier Objects 101.com. 2016-10-10. Archived from the original on 2016-10-28.

nasa.gov

"Messier 51 (The Whirlpool Galaxy)". 6 October 2017.
Garner, Rob (2017-10-06). "Messier 51 (The Whirlpool Galaxy)". NASA. Retrieved 2021-01-20.
"Hubble's Messier Catalogue – Messier 51 (The Whirlpool Galaxy)". NASA. October 17, 2017. Retrieved September 6, 2021.

apod.nasa.gov

Nemiroff, R.; Bonnell, J., eds. (February 24, 2013). "M51: The Whirlpool Galaxy". Astronomy Picture of the Day. NASA. Retrieved October 11, 2018.

nature.com

Di Stefano, Rosanne; Berndtsson, Julia; Urquhart, Ryan; Soria, Roberto; Kashyap, Vinay L.; Carmichael, Theron W.; Imara, Nia (2021-10-25). "A possible planet candidate in an external galaxy detected through X-ray transit". Nature Astronomy. 5 (12): 1297–1307. arXiv:2009.08987. Bibcode:2021NatAs...5.1297D. doi:10.1038/s41550-021-01495-w. ISSN 2397-3366. S2CID 239892362.

newscientist.com

Crane, Leah (23 September 2020). "Astronomers may have found the first planet in another galaxy". New Scientist. Retrieved 25 September 2020.

nih.gov

pubmed.ncbi.nlm.nih.gov

Honig, Z.N.; Reid, M.J. (February 2015). "Characteristics of Spiral Arms in Late-type Galaxies". The Astrophysical Journal. 800 (1): 5387–5394. arXiv:1412.1012. Bibcode:2015ApJ...800...53H. doi:10.1088/0004-637X/800/1/53. PMID 53. S2CID 118666575. Retrieved November 10, 2022.

rochesterastronomy.org

Bishop, David. "Supernovae 2011dh in M51". supernovae.net (International Supernovae Network). Retrieved 2011-06-06.

seds.org

messier.seds.org

"M51". SEDS.org.

semanticscholar.org

api.semanticscholar.org

Matsushita, Satoki; Muller, Sebastien; Lim, Jeremy (9 April 2007). "Jet-disturbed molecular gas near the Seyfert 2 nucleus in M51". Astronomy & Astrophysics. 468 (A&A Letters Special Issue): L49–L52. arXiv:0704.0947. Bibcode:2007A&A...468L..49M. doi:10.1051/0004-6361:20067039. S2CID 15471799.
Castro-Rodríguez, N.; López-Corredoira, M.; Sánchez-Saavedra, M. L.; Battaner, E. (2002). "Warps and correlations with intrinsic parameters of galaxies in the visible and radio". Astronomy & Astrophysics. 391 (2): 519–530. arXiv:astro-ph/0205553. Bibcode:2002A&A...391..519C. doi:10.1051/0004-6361:20020895. S2CID 17813024.
Honig, Z.N.; Reid, M.J. (February 2015). "Characteristics of Spiral Arms in Late-type Galaxies". The Astrophysical Journal. 800 (1): 5387–5394. arXiv:1412.1012. Bibcode:2015ApJ...800...53H. doi:10.1088/0004-637X/800/1/53. PMID 53. S2CID 118666575. Retrieved November 10, 2022.
Salo, Heikki; Laurikainen, Eija (1999). "A Multiple Encounter Model of M51". Astrophysics and Space Science. 269: 663–664. Bibcode:1999Ap&SS.269..663S. doi:10.1023/A:1017002909665. S2CID 189838328.
Watkins, Aaron E.; Mihos, J. Christopher; Harding, Paul (February 2015). "Deep Imaging of M51: a New View of the Whirlpool's Extended Tidal Debris". The Astrophysical Journal. 800 (1): 7. arXiv:1501.04599. Bibcode:2015ApJ...800L...3W. doi:10.1088/2041-8205/800/1/L3. S2CID 118603790. Retrieved November 18, 2022.
Sauer, D. N.; Mazzali, P. A.; Deng, J.; Valenti, S.; et al. (2006). "The properties of the 'standard' Type Ic supernova 1994I from spectral models". Monthly Notices of the Royal Astronomical Society. 369 (4): 1939–1948. arXiv:astro-ph/0604293. Bibcode:2006MNRAS.369.1939S. doi:10.1111/j.1365-2966.2006.10438.x. S2CID 119510845.
Jacob E. Jencson; Scott M. Adams; Howard E. Bond (2019). "Discovery of an intermediate-luminosity red transient in M51 and its likely dust-obscured, infrared-variable progenitor". The Astrophysical Journal Letters. 880 (L20): L20. arXiv:1904.07857. Bibcode:2019ApJ...880L..20J. doi:10.3847/2041-8213/ab2c05. S2CID 119110002.
Di Stefano, Rosanne; Berndtsson, Julia; Urquhart, Ryan; Soria, Roberto; Kashyap, Vinay L.; Carmichael, Theron W.; Imara, Nia (2021-10-25). "A possible planet candidate in an external galaxy detected through X-ray transit". Nature Astronomy. 5 (12): 1297–1307. arXiv:2009.08987. Bibcode:2021NatAs...5.1297D. doi:10.1038/s41550-021-01495-w. ISSN 2397-3366. S2CID 239892362.
Giuricin, G.; Marinoni, C.; Ceriani, L.; Pisani, A. (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal. 543 (1): 178–194. arXiv:astro-ph/0001140. Bibcode:2000ApJ...543..178G. doi:10.1086/317070. S2CID 9618325.
Ferrarese, L.; Ford, H. C.; Huchra, J.; Kennicutt Jr., R. C.; et al. (2000). "A Database of Cepheid Distance Moduli and Tip of the Red Giant Branch, Globular Cluster Luminosity Function, Planetary Nebula Luminosity Function, and Surface Brightness Fluctuation Data Useful for Distance Determinations". Astrophysical Journal Supplement. 128 (2): 431–459. arXiv:astro-ph/9910501. Bibcode:2000ApJS..128..431F. doi:10.1086/313391. S2CID 121612286.

skyandtelescope.com

MacRobert, Alan M. (August 24, 2005). "Supernova in M51". Sky Tonight. Sky and Telescope. Retrieved August 7, 2006.

supernovae.net

Bishop, David. "Supernova 2005cs in M51". supernovae.net. Archived from the original on October 3, 2006. Retrieved August 7, 2006.

universeforfacts.com

"Whirlpool Galaxy: First Spiral Galaxy". Universe for Facts. Retrieved 2014-12-21.

web.archive.org

"M 51". Messier Objects 101.com. 2016-10-10. Archived from the original on 2016-10-28.
"Whirlpool Galaxy". Herschel Space Observatory. Cardiff University. June 19, 2009. Archived from the original on January 10, 2019. Retrieved October 11, 2018.
Bishop, David. "Supernova 2005cs in M51". supernovae.net. Archived from the original on October 3, 2006. Retrieved August 7, 2006.
"Signs of first planet found outside our galaxy". BBC News. 2021-10-25. Archived from the original on 2021-10-25.

wis-tns.org

"AT 2019abn". Transient Name Server. IAU. Retrieved 24 August 2024.

worldcat.org

search.worldcat.org

Hua; et al. (1987). "[Unknown]". Astrophysical Letters & Communications. 25: 187–204. ISSN 0888-6512. OCLC 60627567.
Di Stefano, Rosanne; Berndtsson, Julia; Urquhart, Ryan; Soria, Roberto; Kashyap, Vinay L.; Carmichael, Theron W.; Imara, Nia (2021-10-25). "A possible planet candidate in an external galaxy detected through X-ray transit". Nature Astronomy. 5 (12): 1297–1307. arXiv:2009.08987. Bibcode:2021NatAs...5.1297D. doi:10.1038/s41550-021-01495-w. ISSN 2397-3366. S2CID 239892362.