測光システム
嶋作 一大
等級の定義 --- 波長 lam0 もしくは振動数 nu0 での等級
(1) 標準システム
m(lam0) = -2.5 log[f_lam0(天体)/f_lam0(Vega)] + C(lam0)
f_lam [erg/s/cm^2/A]
C(lam) = 波長 (band) に依存する定数。ただしほとんどゼロ。
(2) AB システム
m_AB(nu) = -2.5 log[f_nu(天体)] - 48.60
f_nu [erg/s/cm^2/Hz]
(3) あるバンドでの f_lam0, f_nu0 の求め方
f_lam0(天体) = [\int f_lam(天体) R(lam) dlam] / [\int R(lam) dlam]
f_nu0(天体) = [\int f_nu(天体) R(nu) dnu] / [\int R(nu) dnu]
(4) R(lam) の定義
写真乾板
R(lam) = T(lam) * e(lam)
T(lam) = filter の透過率 + 望遠鏡システムの透過率
e(lam) = 乾板の感度
CCD
R(lam) = T(lam) * QE(lam) / (h*nu)
T(lam) = filter の透過率 + 望遠鏡システムの透過率
QE(lam) = CCD QE
h*nu = 光子 1 個のエネルギー
CCD は光子の数を数えて等級を出しているので、h*nu で割る必要がある。
Photometric Bandpasses
U (Johnson)
B (Johnson)
V (Johnson)
Rc (Kron-Cousins)
Ic (Kron-Cousins)
J (Bessell)
H (Bessell)
K (Bessell)
F300W (HST)
F450W (HST)
F555W (HST)
F606W (HST)
F702W (HST)
F814W (HST)
bj (photographic)
rf (photographic)
Thuan & Gunn u
Thuan & Gunn g
Thuan & Gunn v
Thuan & Gunn r
Steidel & Hamilton Un
Steidel & Hamilton G
Steidel & Hamilton R
Suprime-Cam filters: Jan 2005
--- values for T = 0 degC and F/1.86
Suprime B (transmission only)
Suprime V (transmission only)
Suprime R (transmission only)
Suprime I (transmission only)
Suprime g' (transmission only)
Suprime r' (transmission only)
Suprime i' (transmission only)
Suprime z' (transmission only)
Suprime B (CCD+optics+mirror+secz1.2)
Suprime V (CCD+optics+mirror+secz1.2)
Suprime R (CCD+optics+mirror+secz1.2)
Suprime I (CCD+optics+mirror+secz1.2)
Suprime g' (CCD+optics+mirror+secz1.2)
Suprime r' (CCD+optics+mirror+secz1.2)
Suprime i' (CCD+optics+mirror+secz1.2)
Suprime z' (CCD+optics+mirror+secz1.2)
Vega SEDs
f_lam [ergs/s/cm2/A] (optical wavelength range; adopted in FSI 1995)
f_nu [ergs/s/cm2/Hz] (optical wavelength range; adopted in FSI 1995)
f_lam [ergs/s/cm2/A] (opt+NIR wavelength range; Jun 2000)
f_nu [ergs/s/cm2/Hz] (opt+NIR wavelength range; Jun 2000)
Brightness of Vega in the standard system
Table
Absolute mag of Vega
Table
Transformation between the standars system and the AB system
Table
Absolute mag of the Sun
Table
SEDs of stars (175 stars; Gunn & Stryker, 1983, ApJS, 52, 121; optical)
gzipped tar file (142kB)
--- 1st col = wavelength [A]
--- 2nd col = f_lam [arbitrary x ergs/s/cm2/A]
SEDs of stars (175 stars; Gunn & Stryker, 1983, ApJS, 52, 121; extended to NIR)
gzipped tar file (1.07MB)
--- 1st col = wavelength [A]
--- 2nd col = f_lam [arbitrary x ergs/s/cm2/A]
Galaxy SEDs (valid for lam<10000A; adopted in FSI 1995)
--- 1st col = wavelength [A]
--- 2nd col = f_lam [arbitrary x ergs/s/cm2/A]
E (UV bright)
E (UV faint)
S0
Sab
Sbc
Scd
Im
Galaxy SEDs (valid for lam<26000A; from Neugebauer --- not for distribution?)
optical = CWW; NIR = Aaronson
--- 1st col = wavelength [A]
--- 2nd col = f_lam [arbitrary x ergs/s/cm2/A]
E (UV faint)
Sbc
Scd
Im
README
Galaxy SEDs (GISSEL96)
--- 1st col = wavelength [A]
--- 2nd col = f_lam [arbitrary x ergs/s/cm2/A]
bulge (15Gyr)
disk (1Gyr)
disk (5Gyr)
disk (10Gyr)
disk (15Gyr)
Galaxy SEDs (KA97)
--- 1st col = wavelength [A]
--- 2nd col = f_lam [arbitrary x ergs/s/cm2/A]
bulge (15Gyr)
disk (1Gyr)
disk (5Gyr)
disk (10Gyr)
disk (15Gyr)
README
created Dec 13, 2000
shimasaku@astron.s.u-tokyo.ac.jp