NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-20 T00:35:35 PDT
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Spectral Energy Distribution (SED) for 4C +31.21:

10 Data Points
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Photometric Data --- Published and Homogenized [Frequency, Flux Density] Units

  Published UnitsHomogenized Units [Frequency, Flux Density]  
No.Observed PassbandMeasurementUncertaintyUnitsFreq (Hz)MeasurementUncertaintyUnitsModeAperture/QualifiersReference CodeNo.
1 4.85 GHz 428 +/- 55 milliJy 4.85E+09 4.28E-01 +/- 5.50E-02 Jy Broad-band 1991ApJS...75.1011G 1
2 4.85 GHz 429 +/- 15 % milliJy 4.85E+09 4.29E-01 +/- 6.44E-02 Jy Broad-band 1991ApJS...75....1B 2
3 4830 MHz (NRAO) 471 ... milliJy 4.83E+09 4.71E-01 ... Jy Broad-band S/N = 67 1990ApJS...72..621L 3
4 1.4GHz 1159.0 +/- 38.9 milliJy 1.40E+09 1.16E+00 +/- 3.89E-02 Jy Broad-band High peak 1998AJ....115.1693C 4
5 1.40 GHz 955 ... milliJy 1.40E+09 9.55E-01 ... Jy Broad-band 1992ApJS...79..331W 5
6 408 MHz 3.210 +/- 5 % Jy 4.08E+08 3.21E+00 +/- 1.61E-01 Jy Broad-band 1970A&AS....1..281C 6
7 365 MHz (Texas) 3.859 +/- 0.101 Jy 3.65E+08 3.86E+00 +/- 1.01E-01 Jy Broad-band Model:A;MFlag:+;EFlag:+;LFlag:+. 1996AJ....111.1945D 7
8 178 MHz 4.2 +/- 12.5% Jy 1.78E+08 4.20E+00 +/- 5.25E-01 Jy Broad-band 1965MmRAS..69..183P 8
9 74 MHz (VLA) 10.69 +/- 1.10 Jy 7.38E+07 1.07E+01 +/- 1.10E+00 Jy Broad-band Corrected for clean bias 2007AJ....134.1245C 9
10 26.3 MHz 28. +/- 7. Jy 2.63E+07 2.80E+01 +/- 7.00E+00 Jy Broad-band 1975AJ.....80..931V 10


Detailed Information for Each Entry

 No. 1
Reference Code : 1991ApJS...75.1011G
Freq. targeted : 4.85 GHz            
Measurement    :  428         milliJy              = 4.28E-27 W m^-2^ Hz^-1^
Uncertainty    :  55          milliJy              = 5.50E-28
Significance   : rms noise
Freq or Vel.   : 4.85         GHz          (OBS   )= 4.85E+09 Hz
Frequency mode : Broad-band measurement
Coord. targeted: 055008.4        +311715 (B1950)
Spatial mode   : Modelled datum
Notes          : From new raw data; Corrected for contaminating sources
Qualifiers     :                                         

No. 2 Reference Code : 1991ApJS...75....1B Freq. targeted : 4.85 GHz Measurement : 429 milliJy = 4.29E-27 W m^-2^ Hz^-1^ Uncertainty : 15 % milliJy = 6.44E-28 Significance : uncertainty Freq or Vel. : 4.85 GHz (OBS )= 4.85E+09 Hz Frequency mode : Broad-band measurement Coord. targeted: 055008.5 +311715 (B1950) Spatial mode : Peak flux Notes : From new raw data; Corrected for contaminating sources Qualifiers :
No. 3 Reference Code : 1990ApJS...72..621L Freq. targeted : 4830 MHz (NRAO) Measurement : 471 milliJy = 4.71E-27 W m^-2^ Hz^-1^ Uncertainty : milliJy = 0.00E+00 Significance : no uncertainty reported Freq or Vel. : 4830 MHz (OBS )= 4.83E+09 Hz Frequency mode : Broad-band measurement Coord. targeted: 05 53 20.3 +31 18 03 (J2000) Spatial mode : Flux integrated from map Notes : From new raw data Qualifiers : S/N = 67
No. 4 Reference Code : 1998AJ....115.1693C Freq. targeted : 1.4GHz Measurement : 1159.0 milliJy = 1.16E-26 W m^-2^ Hz^-1^ Uncertainty : 38.9 milliJy = 3.89E-28 Significance : uncertainty Freq or Vel. : 1.40 GHz (OBS )= 1.40E+09 Hz Frequency mode : Broad-band measurement Coord. targeted: 05 53 21.59 +31 17 51.0 (J2000) Spatial mode : Flux integrated from map Notes : From new raw data Qualifiers : High peak
No. 5 Reference Code : 1992ApJS...79..331W Freq. targeted : 1.40 GHz Measurement : 955 milliJy = 9.55E-27 W m^-2^ Hz^-1^ Uncertainty : milliJy = 0.00E+00 Significance : no uncertainty reported Freq or Vel. : 1.4 GHz (OBS )= 1.40E+09 Hz Frequency mode : Broad-band measurement Coord. targeted: 055008.5 +311715 (B1950) Spatial mode : Peak flux Notes : From new raw data Qualifiers :
No. 6 Reference Code : 1970A&AS....1..281C Freq. targeted : 408 MHz Measurement : 3.210 Jy = 3.21E-26 W m^-2^ Hz^-1^ Uncertainty : 5 % Jy = 1.61E-27 Significance : internal error Freq or Vel. : 408 MHz (OBS )= 4.08E+08 Hz Frequency mode : Broad-band measurement; peak value reported Coord. targeted: 055007.5 +311730. (B1950) Spatial mode : Peak flux Notes : From new raw data Qualifiers :
No. 7 Reference Code : 1996AJ....111.1945D Freq. targeted : 365 MHz (Texas) Measurement : 3.859 Jy = 3.86E-26 W m^-2^ Hz^-1^ Uncertainty : 0.101 Jy = 1.01E-27 Significance : internal error Freq or Vel. : 365 MHz (OBS )= 3.65E+08 Hz Frequency mode : Broad-band measurement; obtained by interpolation over frequency Coord. targeted: 055007.323 311714.50 (B1950) Spatial mode : Integrated from scans Notes : From new raw data Qualifiers : Model:A;MFlag:+;EFlag:+;LFlag:+.
No. 8 Reference Code : 1965MmRAS..69..183P Freq. targeted : 178 MHz Measurement : 4.2 Jy = 4.20E-26 W m^-2^ Hz^-1^ Uncertainty : 12.5% Jy = 5.25E-27 Significance : uncertainty Freq or Vel. : 178 MHz (OBS )= 1.78E+08 Hz Frequency mode : Broad-band measurement Coord. targeted: 055008.3 +311912 (B1950) Spatial mode : Integrated from scans Notes : From new raw data; Uncorrected for known sources in beam Qualifiers :
No. 9 Reference Code : 2007AJ....134.1245C Freq. targeted : 74 MHz (VLA) Measurement : 10.69 Jy = 1.07E-25 W m^-2^ Hz^-1^ Uncertainty : 1.10 Jy = 1.10E-26 Significance : rms uncertainty Freq or Vel. : 73.8 MHz (OBS )= 7.38E+07 Hz Frequency mode : Broad-band measurement Coord. targeted: 05 53 21.49 +31 17 51.5 (J2000) Spatial mode : Flux integrated from map Notes : From new raw data Qualifiers : Corrected for clean bias
No. 10 Reference Code : 1975AJ.....80..931V Freq. targeted : 26.3 MHz Measurement : 28. Jy = 2.80E-25 W m^-2^ Hz^-1^ Uncertainty : 7. Jy = 7.00E-26 Significance : uncertainty Freq or Vel. : 26.3 MHz (OBS )= 2.63E+07 Hz Frequency mode : Broad-band measurement Coord. targeted: 055024. +313400. (B1950) Spatial mode : Integrated from scans; Beam filling or dilution corrected Notes : From new raw data Qualifiers :

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