Photometric system

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In astronomy, a Photometric system is a set of well-defined passbands (or filters), with a known sensitivity to incident radiation. The sensitivity usually depends on the optical system, detectors and filters used. For each photometric system a set of primary standard stars is provided.

The first known standardized photometric system is the Johnson-Morgan or UBV photometric system (1953). At present, there are more than 200 photometric systems.

Photometric systems are usually characterized according to the widths of their passbands:

  • broadband (passbands wider than 30 nm, the most widely used is Johnson-Morgan UBV system)
  • intermediate band (passbands between 10 and 30 nm wide)
  • narrow band (passbands less than 10 nm wide)

Contents

[edit] Photometric Letters

The letters designate a region of a wavelength of light. Majority of the letters span from near-ultraviolet (NUV) to visible and majority of the near-infrared (NIR).

Note, indigo and cyan are not standard colors.[1] Orange, yellow, and green fall under visual bands, while violet and purple are under the blue bands. Note, the letters are not standards, they are just recognized by astronomers and astrophysicists.

Filter Letter Effective Wavelength Midpoint λeff For Standard Filter[2] Full Width Half Maximum[2] Variant(s) Description
Ultraviolet
U 365nm 66nm u, u', u* "U" stands for ultraviolet.
Visible
B 445nm 94nm b "B" stands for blue.
V 551nm 88nm v, v' "V" stands for visual.
G g, g' "G" stands for green (visual).
R 658nm 138nm r, r', R', Rc, Re, Rj "R" stands for red.
Near-Infrared
I 806nm 149nm i, i', Ic, Ie, Ij "I" stands for infrared.
Z 900nm[3] z, z'
Y 1020nm 120 nm y
J 1220nm 213nm J', Js
H 1630nm 307nm
K 2190nm 390nm K Continuum, K', Ks, Klong, K8, nbK
L 3450nm 472nm L', nbL'
Mid-Infrared
M 4750nm 460nm M', nbM
N N1, N2, N3
Q Q'

[edit] Filters Used

The filters currently being used by other telescopes or organizations.

Units of measurements:

Name Filters Link
2.2m telescope at La Silla, ESO J = 1.24μm H = 1.63μm K = 2.19μm L' = 3.78μm M = 4.66μm N1 = 8.36μm N2 = 9.67μm N3 = 12.89μm 2.2m telescope at La Silla, ESO[4]
2MASS/PAIRITEL J = 1.25μm H = 1.65μm Ks = 2.15μm Two Micron All-Sky Survey, Peters Automated InfraRed Imaging TELescope
CFHTLS (Megacam) u* = 374nm g' = 487nm r' = 625nm i' = 770nm z' = 890nm Canada-France-Hawaii Telescope
Chandra X-ray Observatory LETG = 0.08-0.2keV HETG = 0.4-10keV Chandra X-ray Observatory
CTIO J = 1.20μm H = 1.60μm K = 2.20μm L = 3.50μm Cerro Tololo Inter-American Observatory, a division of NOAO
Cousins RI photometry Rc = 647nm Ic = 786.5nm Cousins RI photometry, 1976[5]
DENIS I = 0.79μm J = 1.24μm K = 2.16μm Deep Near Infrared Survey
Eggen RI photometry Re = 635nm Ie = 790nm Eggen RI photometry, 1965[6]
FIS N60 = 65.00μm WIDES-S = 75.00μm WIDE-L = 145.00μm N160 = 160.00μm Far-Infrared Surveyor on board, AKARI space telescope
GALEX NUV = 1800-2750Å FUV = 1400-1700Å GALaxy Evolution Explorer
GOODS (Hubble ACS) B = 435nm V = 606nm i = 775nm z = 850nm Advanced Camera for Surveys on the Hubble Space Telescope
HAWC Band 1 = 53µm Band 2 = 88µm Band 3 = 155µm Band 4 = 215µm High-resolution Airborne Wideband Camera for SOFIA[7]
HDF 450nm 606nm 814nm Hubble Deep Field from the Hubble Space Telescope
IRTF NSFCAM J = 1.26µm H = 1.62µm K' = 2.12µm Ks = 2.15µm K = 2.21µm L = 3.50µm L' = 3.78µm M' = 4.78µm M = 4.85µm NASA Infrared Telescope Facility NSFCAM[8]
ISAAC UTI/VLT[9] Js = 1.2µm H = 1.6µm Ks = 2.2µm L = 3.78µm Brα = 4.07µm Infrared Spectrometer And Array Camera at Very Large Telescope
Johnson system (UBV) U = 364 nm B = 442 nm V = 540 nm UBV photometric system
OMC Johnson V-filter = 500-580nm Optical Monitor Camera[10] on INTEGRAL
Pan-STARRS uses the Sloan's g,r,i,z filters plus y = 1005nm Panoramic Survey Telescope And Rapid Response System
ProNaOS/SPM Band 1 = 180-240µm Band 2 = 240-340µm Band 3 = 340-540µm Band 4 = 540-1200µm PROgramme NAtional d'Observations Submillerètrique/Systéme Photométrique Multibande, balloon-borne experiment[11]
Sloan u' = 354nm g' = 475nm r' = 622nm i' = 763nm z' = 905nm Sloan Digital Sky Survey
SPIRIT III Band B1 = 4.29μm Band B2 = 4.35μm Band A = 8.28μm Band C = 12.13μm Band D = 14.65μm Band E = 21.34μm Infrared camera on Midcourse Space Experiment[12]
Spitzer IRAC 3.6μm 4.5μm 5.8μm 8.0μm Infrared Array Camera on Spitzer Space Telescope
Spitzer MIPS 24μm 70μm 160μm Multiband Imaging Photometer for Spitzer on Spitzer
Stromvil filters U = 345nm P = 374nm S = 405nm Y = 466nm Z = 516nm V = 544nm S = 656nm Stromvil photometry
Strömgren filters u = 350nm v = 411nm b = 467nm y = 547nm ß narrow = 485.8nm ß wide = 485nm Strömgren photometric system
UKIDSS (WFCAM) Z = 882nm Y = 1031nm J = 1248nm H = 1631nm K = 2201nm UKIRT Infrared Deep Sky Survey
Vilnius photometric system U = 345nm P = 374nm X = 405nm Y = 466nm Z = 516nm V = 544nm S = 656nm Vilnius photometric system
VISTA IRC Z = 0.88μm Y = 1.02μm J = 1.25μm H = 1.65μm Ks = 2.20μm NB1.18 = 1.18μm Visible & Infrared Survey Telescope for Astronomy
WISE 3.4μm 4.6μm 12μm 22μm Wide-field Infrared Survey Explorer
XMM-Newton OM UVW2 = 212nm UVM2 = 231nm UVW1 = 291nm U = 344nm B = 450nm V = 543nm XMM-Newton Optical/UV Monitoring[13]
XEST Survey UVW2 = 212nm UVM2 = 231nm UVW1 = 291nm U = 344nm B = 450nm V = 543nm J = 1.25μm H = 1.65μm Ks = 2.15μm Survey includes the point source of 2MASS with XMM-Newton OM[14]

[edit] References

  1. ^ Spectral Colors
  2. ^ a b Binney, J.; Merrifield M. Galactic Astronomy, Princeton University Press, 1998, ch. 2.3.2, pp. 53
  3. ^ Gouda, N.; N. Gouda, T. Yano, Y. Kobayashi, Y. Yamada, T. Tsujimoto, T. Nakajima, M. Suganuma, H. Matsuhara, S. Ueda and the JASMINE Working Group (23 May 2005). "JASMINE: Japan Astrometry Satellite Mission for INfrared Exploration". Proceedings of the International Astronomical Union 2004 (IAUC196): 455–468. doi:10.1017/S1743921305001614. 
  4. ^ A study of the Chamaeleon I dark cloud and T-association. II - High-resolution IRAS maps around HD 97048 and 97300, Assendorp, R.; Wesselius, P. R.; Prusti, T.; Whittet, D. C. B., 1990
  5. ^ ADPS
  6. ^ ADPS
  7. ^ HAWC
  8. ^ NSFCAM
  9. ^ "ISAAC Overview". Paranal Instrumentation. ESO. http://www.eso.org/sci/facilities/paranal/instruments/isaac/overview.html. Retrieved 13 October 2011. 
  10. ^ About INTEGRAL
  11. ^ Calibration of the PRONAOS/SPM submillimeter photometer, F.Pajot et al. 2006
  12. ^ MSXPSC - Midcourse Space Experiment (MSX) Point Source Catalog, V2.3
  13. ^ XMM-Newton SAS: Watchout Page
  14. ^ The XMM-Newton Optical Monitor Survey of the Taurus Molecular Cloud, M.Audard et al. 2006
  1. Johnson, H. L.; Morgan, W. W. (1953), Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes spectral atlas, The Astrophysical Journal, vol. 117, pp. 313-352 [1]
  2. The Asiago Database on Photometric Systems
  3. Michael S. Bessell (2005), STANDARD PHOTOMETRIC SYSTEMS, Annual Reviews of Astronomy and Astrophysics vol. 43, pp. 293–336
  4. Infrared portrait of the nearby massive star-forming region IRAS 09002-4732, Apai, D.; Linz, H.; Henning, Th.; Stecklum, B., 2005

[edit] See also

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