A dark galaxy is a hypothesized galaxy with no (or very few) stars. They received their name because they have no visible stars[1] but may be detectable if they contain significant amounts of gas. Astronomers have long theorized the existence of dark galaxies, but there are no confirmed examples to date.[2] Dark galaxies are distinct from intergalactic gas clouds caused by galactic tidal interactions, since these gas clouds do not contain dark matter, so they do not technically qualify as galaxies. Distinguishing between intergalactic gas clouds and galaxies is difficult; most candidate dark galaxies turn out to be tidal gas clouds.[3] The best candidate dark galaxies to date include HI1225+01,[4] AGC229385,[5] and numerous gas clouds detected in studies of quasars.

On 25 August 2016, astronomers reported that Dragonfly 44, an ultra diffuse galaxy (UDG) with the mass of the Milky Way galaxy, but with nearly no discernable stars or galactic structure, is made almost entirely of dark matter.[6][7][8]

Observational evidence

Large surveys with sensitive but low-resolution radio telescopes like Arecibo or the Parkes Telescope look for 21-cm emission from atomic hydrogen in galaxies. These surveys are then matched to optical surveys to identify any objects with no optical counterpart; i.e., sources with no stars.

Another way astronomers search for dark galaxies is to look for hydrogen absorption lines in the spectra of background quasars. This technique has revealed many intergalactic clouds of hydrogen, but following up on candidate dark galaxies is difficult, since these sources tend to be too far away and are often optically drowned out by the bright light from the quasars.

Nature of dark galaxies

Origin

In 2005, astronomers discovered gas cloud VIRGOHI21 and attempted to determine what it was and why it exerted such a massive gravitational pull on galaxy NGC 4254. After years of ruling out other possible explanations, some have concluded that VIRGOHI21 is a dark galaxy.[9]

Size

The actual size of dark galaxies is unknown because they cannot be observed with normal telescopes. There have been various estimations, ranging from double the size of the Milky Way[10] to the size of a small quasar.

Structure

Dark galaxies are theoretically composed of dark matter, hydrogen and dust.[9] Some scientists support the idea that dark galaxies may contain stars.[11] Yet the exact composition of dark galaxies remains unknown because there is no conclusive way to identify them. Nevertheless, astronomers estimate that the mass of the gas in these galaxies is approximately one billion times that of the Sun.[12]

Methodology to observe dark bodies

Dark galaxies contain no visible stars and are invisible to optical telescopes. The Arecibo Galaxy Environment Survey (AGES) harnessed the Arecibo radio telescope to search for dark galaxies, which are predicted to contain detectable amounts of neutral hydrogen. The Arecibo radio telescope was useful where others are not because of its ability to detect the emission from this neutral hydrogen, specifically the 21-cm line.

Alternative theories

Scientists say that the galaxies we see today only began to create stars after dark galaxies. Based on numerous scientific assertions, dark galaxies played a big role in many of the galaxies astronomers and scientists see today. Martin Haehnel, from Kavli Institute for Cosmology at the University of Cambridge, claims that the precursor to the Milky Way galaxy was actually a much smaller bright galaxy that had merged with dark galaxies nearby to form the Milky Way we currently see. Multiple scientists agree that dark galaxies are building blocks of modern galaxies. Sebastian Cantalupo of the University of California, Santa Cruz, agrees with this theory. He goes on to say, "In our current theory of galaxy formation, we believe that big galaxies form from the merger of smaller galaxies. Dark galaxies bring to big galaxies a lot of gas, which then accelerates star formation in the bigger galaxies." Scientists have specific techniques they use to locate these dark galaxies. These techniques have the capability of teaching us more about other special events that occur in the universe; for instance, the "cosmic web". This "web" is made of invisible filaments of gas and dark matter believed to permeate the universe, as well as "feeding and building galaxies and galaxy clusters where the filaments intersect."[12]

Potential dark galaxies

FAST J0139+4328

Located 94 million light years away from Earth, this galaxy is visible in radio waves with minimal visible light.[13]

HE0450-2958

HE0450-2958 is a quasar at redshift z=0.285. Hubble Space Telescope images showed that the quasar is located at the edge of a large cloud of gas, but no host galaxy was detected for the quasar. The authors of the Hubble study suggested that one possible scenario was that the quasar is located in a dark galaxy.[14] However, subsequent analysis by other groups found no evidence that the host galaxy is anomalously dark, and demonstrated that a normal host galaxy is probably present,[15][16] so the observations do not support the dark galaxy interpretation.

HVC 127-41-330

HVC 127-41-330 is a cloud rotating at high speed between Andromeda and the Triangulum Galaxy. Astronomer Josh Simon considers this cloud to be a dark galaxy because of the speed of its rotation and its predicted mass.[17][18]

Smith's Cloud

Smith's Cloud is a candidate to be a dark galaxy, due to its projected mass and survival of encounters with the Milky Way.[19]

VIRGOHI21

Initially discovered in 2000, VIRGOHI21 was announced in February 2005 as a good candidate to be a true dark galaxy.[11][20][21][22] It was detected in 21-cm surveys, and was suspected to be a possible cosmic partner to the galaxy NGC 4254. This unusual-looking galaxy appears to be one partner in a cosmic collision, and appeared to show dynamics consistent with a dark galaxy (and apparently inconsistent with the predictions of the Modified Newtonian Dynamics (MOND) theory).[23] However, further observations revealed that VIRGOHI21 was an intergalactic gas cloud, stripped from NGC4254 by a high speed collision.[24][25][26] The high speed interaction was caused by infall into the Virgo cluster.

See also

References

  1. ↑ "First evidence of dark galaxies from the early Universe spotted". Zmescience.com. 2012-07-11. Retrieved 2012-08-13.
  2. ↑ Cannon, John M.; Martinkus, Charlotte P.; Leisman, Lukas; Haynes, Martha P.; Adams, Elizabeth A. K.; Giovanelli, Riccardo; Hallenbeck, Gregory; Janowiecki, Steven; Jones, Michael (2015-02-01). "The Alfalfa "Almost Darks" Campaign: Pilot VLA HI Observations of Five High Mass-To-Light Ratio Systems". The Astronomical Journal. 149 (2): 72. arXiv:1412.3018. Bibcode:2015AJ....149...72C. doi:10.1088/0004-6256/149/2/72. ISSN 0004-6256. S2CID 118592858.
  3. ↑ Oosterloo, T. A.; Heald, G. H.; De Blok, W. J. G. (2013). "Is GBT 1355+5439 a dark galaxy?". Astronomy & Astrophysics. 555: L7. arXiv:1306.6148. Bibcode:2013A&A...555L...7O. doi:10.1051/0004-6361/201321965. S2CID 118402005.
  4. ↑ "The Arecibo Legacy Fast ALFA Survey". egg.astro.cornell.edu. Retrieved 2015-09-29.
  5. ↑ Janowiecki, Steven; Leisman, Lukas; Józsa, Gyula; Salzer, John J.; Haynes, Martha P.; Giovanelli, Riccardo; Rhode, Katherine L.; Cannon, John M.; Adams, Elizabeth A. K. (2015-03-01). "(Almost) Dark HI Sources in the ALFALFA Survey: The Intriguing Case of HI1232+20". The Astrophysical Journal. 801 (2): 96. arXiv:1502.01296. Bibcode:2015ApJ...801...96J. doi:10.1088/0004-637X/801/2/96. ISSN 0004-637X. S2CID 119271121.
  6. ↑ Van Dokkum, Pieter; et al. (25 August 2016). "A High Stellar Velocity Dispersion and ~100 Globular Clusters For The Ultra-Diffuse Galaxy Dragonfly 44". The Astrophysical Journal Letters. 828 (1): L6. arXiv:1606.06291. Bibcode:2016ApJ...828L...6V. doi:10.3847/2041-8205/828/1/L6. S2CID 1275440.
  7. ↑ Hall, Shannon (25 August 2016). "Ghost galaxy is 99.99 per cent dark matter with almost no stars". New Scientist. Retrieved 27 August 2016.
  8. ↑ Feltman, Rachael (26 August 2016). "A new class of galaxy has been discovered, one made almost entirely of dark matter". The Washington Post. Retrieved 26 August 2016.
  9. 1 2 Fraser Cain (2007-06-14). "No Stars Shine in This Dark Galaxy". Universetoday.com. Retrieved 2012-08-13.
  10. ↑ "Arecibo Survey Produces Dark Galaxy Candidate". Spacedaily.com. 2006-04-07. Retrieved 2012-08-13.
  11. 1 2 Stuart Clark. "Dark galaxy' continues to puzzle astronomers". New Scientist. Retrieved 2008-02-26.
  12. 1 2 "First Direct Detection Sheds Light On Dark Galaxies". Zmescience.com. Retrieved 22 December 2012.
  13. ↑ "Mysterious Dark Galaxy Emits No Visible Light, Scientists Say". 10 February 2023.
  14. ↑ Magain P.; et al. (2005). "Discovery of a bright quasar without a massive host galaxy". Nature. 437 (7057): 381–4. arXiv:astro-ph/0509433. Bibcode:2005Natur.437..381M. doi:10.1038/nature04013. PMID 16163349. S2CID 4303895.
  15. ↑ Merritt, David; et al. (2006). "The nature of the HE0450-2958 system". Monthly Notices of the Royal Astronomical Society. 367 (4): 1746–1750. arXiv:astro-ph/0511315. Bibcode:2006MNRAS.367.1746M. doi:10.1111/j.1365-2966.2006.10093.x. S2CID 55834970.
  16. ↑ Kim, Minjin; Ho, Luis; Peng, Chien; Im, Myungshin (2007). "The Host Galaxy of the Quasar HE 0450-2958". The Astrophysical Journal. 658 (1): 107–113. arXiv:astro-ph/0611411. Bibcode:2007ApJ...658..107K. doi:10.1086/510846. S2CID 14375599.
  17. ↑ Josh Simon (2005). "Dark Matter in Dwarf Galaxies: Observational Tests of the Cold Dark Matter Paradigm on Small Scales" (PDF): 4273. Bibcode:2005PhDT.........2S. Archived from the original (PDF) on 2006-09-13. {{cite journal}}: Cite journal requires |journal= (help)
  18. ↑ Battersby, Stephen (2003-10-20). "Astronomers find first 'dark galaxy'". New Scientist. Retrieved December 22, 2012.
  19. ↑ "Dark galaxy crashing into the Milky Way". New Scientist. No. 2735. 22 November 2009. Retrieved 2009-12-12.
  20. ↑ Clark, Stuart (2005-02-23). "Astronomers claim first 'dark galaxy' find". NewScientist.com news service. Retrieved 2006-10-26.
  21. ↑ Shiga, David (2005-02-26). "Ghostly Galaxy: Massive, dark cloud intrigues scientists". Science News Online. 167 (9): 131. doi:10.2307/4015891. JSTOR 4015891. Archived from the original on 2011-05-24. Retrieved 2008-09-14.
  22. ↑ Britt, Roy (2005-02-23). "First Invisible Galaxy Discovered in Cosmology Breakthrough". Space.com.
  23. ↑ Funkhouser, Scott (2005). "Testing MOND with VirgoHI21". Monthly Notices of the Royal Astronomical Society. 364 (1): 237. arXiv:astro-ph/0503104. Bibcode:2005MNRAS.364..237F. doi:10.1111/j.1365-2966.2005.09565.x. S2CID 119368923.
  24. ↑ Kent, Brian R.; Giovanelli, Riccardo; Haynes, Martha P.; Saintonge, Amélie; Stierwalt, Sabrina; Balonek, Thomas; Brosch, Noah; Catinella, Barbara; Koopmann, Rebecca A. (2007-08-01). "Optically Unseen H I Detections toward the Virgo Cluster Detected in the Arecibo Legacy Fast ALFA Survey". The Astrophysical Journal Letters. 665 (1): L15–L18. Bibcode:2007ApJ...665L..15K. doi:10.1086/521100. ISSN 0004-637X.
  25. ↑ Duc, Pierre-Alain; Bournaud, Frederic (2008-02-01). "Tidal Debris from High-Velocity Collisions as Fake Dark Galaxies: A Numerical Model of VIRGOHI 21". The Astrophysical Journal. 673 (2): 787–797. arXiv:0710.3867. Bibcode:2008ApJ...673..787D. doi:10.1086/524868. ISSN 0004-637X. S2CID 15348867.
  26. ↑ Haynes, Martha P.; Giovanelli, Riccardo; Kent, Brian R. (2007). "NGC 4254: An Act of Harassment Uncovered by the Arecibo Legacy Fast ALFA Survey". Astrophysical Journal. 665 (1): L19–22. arXiv:0707.0113. Bibcode:2007ApJ...665L..19H. doi:10.1086/521188. S2CID 12930657.
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