Astronomical survey

From Wikipedia, the free encyclopedia
  (Redirected from Astronomical surveys)
Jump to navigation Jump to search
Composite image of the GOODS-South field, result of a deep survey using two of the four giant 8.2-metre telescopes composing ESO's Very Large Telescope
Gamma-ray pulsars detected by the Fermi Gamma-ray Space Telescope

An astronomical survey is a general map or image of a region of the sky which lacks a specific observational target. Alternatively, an astronomical survey may comprise a set of many images or spectra of objects which share a common type or feature. Surveys are often restricted to one band of the electromagnetic spectrum due to instrumental limitations, although multiwavelength surveys can be made by using multiple detectors, each sensitive to a different bandwidth.[1]

Surveys have generally been performed as part of the production of an astronomical catalog. They may also search for transient astronomical events. They often use wide field astrographs.

Scientific value[edit]

Sky surveys, unlike targeted observation of a specific object, allow astronomers to catalogue celestial objects and perform statistical analyses on them without making prohibitively lengthy observations. In some cases, an astronomer interested in a particular object will find that survey images are sufficient to make telescope time entirely unnecessary.

Surveys also help astronomers obtain observation time on larger, more powerful telescopes. If previous observations support a hypothesis, a telescope scheduling committee is more likely to approve new, more detailed observations to test it.

The wide scope of surveys makes them ideal for searching for moving foreground objects such as asteroids and comets. An astronomer can compare existing survey images to current observations to locate targets which are in motion; this task can even be performed automatically using image analysis software. Similarly, images of the same object taken by different surveys can be compared to detect transient events such as variable stars.[2]

List of sky surveys[edit]

The positions in space of just some of the galaxies identified by the VIPERS survey.[3]

Surveys of the Magellanic Clouds[edit]

See also[edit]


  1. ^ See, for example, Lacy, M., Riley, J. M., Waldram, E. M., McMahon, R. G., & Warner, P. J. (1995). "A radio-optical survey of the North Ecliptic CAP". Monthly Notices of the Royal Astronomical Society. 276 (2): 614–626. Bibcode:1995MNRAS.276..614L. doi:10.1093/mnras/276.2.614.CS1 maint: Multiple names: authors list (link)
  2. ^ Gay, Dr. Pamela; Cain, Fraser (26 May 2008). "Episode #90: The Scientific Method". Astronomy Cast (Podcast). Retrieved 16 Dec 2009.
  3. ^ "3D Map of Distant Galaxies Completed – VLT survey shows distribution in space of 90 000 galaxies". Retrieved 16 December 2016.
  4. ^ Risinger, Nick. "Phototopic Sky Survey". Retrieved 12 May 2011.
  5. ^ Associated Press (12 May 2011). "Amateur Photographer Links 37,000 Pics in Night-Sky Panorama". Fox News. Retrieved 13 May 2011.
  6. ^ "WiggleZ Dark Energy Survey | Home". Retrieved 2014-03-03.
  7. ^ "". Retrieved 2014-03-03.
  8. ^ "SLUGGS survey webpage".
  9. ^ "LAMOST survey webpage".
  10. ^ "The Birth of Monsters". Retrieved 14 December 2015.
  11. ^ "The VLA FIRST Survey". 2008-07-21. Retrieved 2014-03-03.
  12. ^ "The GALEX Arecibo SDSS Survey". Retrieved 2014-03-03.
  13. ^
  14. ^ Driver, Simon P.; Norberg, Peder; Baldry, Ivan K.; Bamford, Steven P.; Hopkins, Andrew M.; Liske, Jochen; Loveday, Jon; Peacock, John A.; Hill, D. T.; Kelvin, L. S.; Robotham, A. S. G.; Cross, N. J. G.; Parkinson, H. R.; Prescott, M.; Conselice, C. J.; Dunne, L.; Brough, S.; Jones, H.; Sharp, R. G.; Van Kampen, E.; Oliver, S.; Roseboom, I. G.; Bland-Hawthorn, J.; Croom, S. M.; Ellis, S.; Cameron, E.; Cole, S.; Frenk, C. S.; Couch, W. J.; et al. (2009). "GAMA: towards a physical understanding of galaxy formation". Astronomy & Geophysics. 50 (5): 5.12. arXiv:0910.5123. Bibcode:2009A&G....50e..12D. doi:10.1111/j.1468-4004.2009.50512.x.
  15. ^ "Atlas3D Survey". Retrieved 2014-03-03.