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Zeropoints (and sources) and monochromatic flux SED shape assumption

Filter set
Suffix
Zero Point
Monochromatic Flux info
Magnitude
Source
Response unit (e-/?)
Assumed SED
Central λ (μm)
Δλ (μm)
Sources

Johnson U -14.23 VEGA Photons Flat 0.36 0.10 Central λ's & widths estimated from zero response limits.
B -15.30 0.46 0.18
V -14.86 0.585 0.21
R -15.10 0.71 0.30
I -14.57 0.81 0.20
J -14.26 1.23 0.36
H -13.49 1.62 0.44
K -13.09 2.18 0.56

Tycho Vt -15.10 VEGA Photons Flat 0.565 0.21 Central λ's & widths estimated from zero response limits.
Bt -14.94 0.4275 0.145

Bessell U -14.23 VEGA Photons Flat 0.36 0.11 Central λ's from Bessell et al (1998) & widths estimated from zero response limits.
B -15.32 0.46 0.18
V -14.86 0.55 0.21
R -15.10 0.64 0.29
I -14.57 0.79 0.20
J -13.92 1.22 0.36
H -13.65 1.63 0.96
K -12.77 2.19 0.36
L -11.74 3.45 0.72

SDSS U -12.427 Using Flat Spectrum at 3631 Jy Photons Flat 0.3555 0.0599 Central λ's & widths from Fukugita et al (1996)
G -14.224 0.473 0.1379
R -14.215 0.6261 0.1382
I -13.776 0.7672 0.1535
Z -11.837 0.9097 0.137

2MASS J -14.08 VEGA Photons Flat 1.235 0.162 Central λ's & widths from Cohen et al (2003)
H -13.38 1.662 0.251
Ks -12.81 2.159 0.262

MKO J -13.49 VEGA Photons Flat 1.24 0.16 Central λ's & widths from Simons and Tokunaga (2002)
H -13.50 1.65 0.29
K -12.70 2.2 0.34

UKIRT Z -13.81 VEGA Photons Flat 0.8775 0.095 Central λ's & widths from Simons and Tokunaga (2002)
Y -13.43 1.02 0.1
J -14.03 1.28 0.42
H -13.33 1.65 0.45
K -12.86 2.2 0.66

IRAS 12 33.074 IRAS explanatory supplement
(1)
Energy Flat 12.0 6.5 Central λ's & widths from Neugebauer et al (1984)
25 36.228 25.0 11.0
60 40.010 60.0 40.0
100 42.224 100.0 37.0

SCUBA(2) 450WB 0 None applied Energy 10,000K Black Body 443.0 138.92 Central λ's from JAC & widths estimated from zero response limits.
850WB 0 863.0 230.636

IRAC(3) 3.6 -19.54 IRAC handbook Photons Flat 3.55 1.2 Central λ's from Reach et al (2005) & widths estimated from zero response limits.
4.5 -19.09 4.493 1.56
5.8 -17.77(4) 5.731 2.27
8.0 -17.97 7.872 4.69

MIPS 24 9.504 MIPS website Energy 10,000K Black Body 23.68 14.20 Central λ's from MIPS website & widths etsimated from zero response limits.
70 22.388 71.42 61.06
160 21.040 155.9 99.83

CIT J -13.77 VEGA Photons Flat 1.25 0.24 Central λ's estimated using widths, which are from Elias et al (1982)
H -13.47 1.65 0.30
K -13.02 2.215 0.41

PACS blue -6.00 VEGA Photons Flat 70 90.5 Central λ's from PACS observers' manual
green -5.27 100 109
red -4.27 160 391.25

SPIRE 250 -3.16 VEGA Photons Flat 250 176.30 Central λ's from SPIRE observers' manual
350 1.87 350 281.26
500 0.0(5) 500 290.24

(1) Used zero magnitude fluxes of 28.3, 6.73, 1.19 and 0.43 (Jy) for 12, 25, 60 and 100 μm channels respectively.
(2) SCUBA 2 filters will be similar to SCUBA.
(3) Gain required to convert from counts to DN used for IRAC.
(4) Updated from Mayne and Harries (2010) value of -17.40. To value used in Mayne, Harries and Rowe (in prep)
(5) Wavelength longer than maximum in Vega spectrum (model and data).


Last modified: Fri Sep 18 13:16:33 BST 2009

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