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