Photometric system
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In astronomy, a Photometric system is a set of well-defined passbands (of 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 widths between 10 and 30 nm),
- narrow band (passbands widths less than 10 nm).
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 and yellow fall under visual bands, while violet and purple are under the blue bands.
Filter Letter | Wavelength range | Varient(s) | Description |
---|---|---|---|
Ultraviolet | |||
U | u, u', u* | "U" stands for ultraviolet. | |
Visible | |||
B | b | "B" stands for blue. | |
V | v, v' | "V" stands for visual. | |
G | g, g' | "G" stands for green. | |
R | r, r', R', Rc, Re, Rj | "R" stands for red. | |
Near-Infrared | |||
I | i, i', Ic, Ie, Ij | "I" stands for infrared. | |
Z | z, z' | ||
Y | y | ||
J | J', Js | ||
K | K Continuum, K', Ks, Klong, K8, nbK | ||
L | L', nbL' | ||
Mid-Infrared | |||
M | M', nbM | ||
N | |||
Q | Q' |
[edit] Used Filters
The filters currently being used by other telescopes or organizations[2].
Units of measurements:
Name | Filters | Link | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
2MASS | J = 1.25μm | H = 1.65μm | Ks = 2.15μm | Two Micron All-Sky Survey | ||||||
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 | |||||
Cousin RI photometry | Rc = 647nm | Ic = 786.5nm | Cousin RI photometry, 1976[3] | |||||||
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[4] | |||||||
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[5] | |||||
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[6] |
ISAAC UTI/VLT | 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[7] on INTEGRAL | ||||||||
Pan-STARRS | uses the Sloan's u,g,r,i,z,y | 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[8] | |||||
Sloan | u' = 354nm | g' = 475nm | r' = 622nm | i' = 763nm | z' = 905nm | y' = 1005nm | 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[9] | |||
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 = 345 | P = 374 | S = 405 | Y = 466 | Z = 516 | V = 544 | S = 656 | 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 | |||
XMM-Newton OM | UVW2 = 212nm | UVM2 = 231nm | UVW1 = 291nm | U = 344nm | B = 450nm | V = 543nm | XMM-Newton Optical/UV Monitoring[10] | |||
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[11] |
[edit] References
- ^ Spectral Colors
- ^ Classic and New Photometric Systems, IAU, Prague 2006
- ^ ADPS
- ^ ADPS
- ^ HAWC
- ^ NSFCAM
- ^ About INTEGRAL
- ^ Calibration of the PRONAOS/SPM submillimeter photometer, F.Pajot et al. 2006
- ^ MSXPSC - Midcourse Space Experiment (MSX) Point Source Catalog, V2.3
- ^ XMM-Newton SAS: Watchout Page
- ^ The XMM-Newton Optical Monitor Survey of the Taurus Molecular Cloud, M.Audard et al. 2006
- 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]
- The Asiago Database on Photometric Systems
- Michael S. Bessell (2005), STANDARD PHOTOMETRIC SYSTEMS, Annual Reviews of Astronomy and Astrophysics vol. 43, pp. 293–336
- Infrared portrait of the nearby massive star-forming region IRAS 09002-4732, Apai, D.; Linz, H.; Henning, Th.; Stecklum, B., 2005