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Date and Time of the Query: 2019-04-20 T00:07:02 PDT
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Spectral Energy Distribution (SED) for NGC 6491:

30 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 FUV (GALEX) AB 18.0076 +/- 0.0540041 mag 1.95E+15 2.28E-04 +/- 1.13E-05 Jy Broad-band Kron flux in elliptical aperture 2012GASC..C...0000S 1
2 FUV (GALEX) AB 20.3502 +/- 0.156480 mag 1.95E+15 2.63E-05 +/- 3.79E-06 Jy Broad-band Flux in 7.5 arcsec diameter aperture 2012GASC..C...0000S 2
3 NUV (GALEX) AB 17.4712 +/- 0.0290534 mag 1.29E+15 3.73E-04 +/- 9.98E-06 Jy Broad-band Kron flux in elliptical aperture 2012GASC..C...0000S 3
4 NUV (GALEX) AB 19.5809 +/- 0.0771253 mag 1.29E+15 5.34E-05 +/- 3.79E-06 Jy Broad-band Flux in 7.5 arcsec diameter aperture 2012GASC..C...0000S 4
5 B (m_B) 14.53 +/- 0.18 mag 6.81E+14 6.57E-03 +/- 1.18E-03 Jy Broad-band 1991RC3.9.C...0000d 5
6 B (m_B^0) 13.85 ... mag 6.81E+14 1.23E-02 ... Jy Broad-band 1991RC3.9.C...0000d 6
7 m_p 14.5 +/- 0.4 mag 6.81E+14 6.75E-03 +/- 3.01E-03 Jy Broad-band 1968CGCG4.C...0000Z 7
8 J (2MASS/FLWO) 12.492 +/- 0.047 mag 2.43E+14 1.61E-02 +/- 6.95E-04 Jy Broad-band Profile-fit; Poor quality 2006AJ....131.1163S 8
9 J (2MASS/FLWO) 12.106 +/- 0.006 mag 2.43E+14 2.29E-02 +/- 1.27E-04 Jy Broad-band 4" aperture 2006AJ....131.1163S 9
10 J 11.290 +/- 0.020 mag 2.40E+14 4.85E-02 +/- 9.02E-04 Jy Broad-band 20032MASX.C.......: 10
11 J_14arcsec (2MASS) 11.754 +/- 0.006 mag 2.40E+14 3.16E-02 +/- 1.75E-04 Jy Broad-band 14.0 x 14.0 arcsec aperture. 20032MASX.C.......: 11
12 J 11.407 +/- 0.018 mag 2.40E+14 4.36E-02 +/- 7.28E-04 Jy Broad-band 38.2 x 28.3 arcsec integration area. 20032MASX.C.......: 12
13 H 10.690 +/- 0.024 mag 1.82E+14 5.42E-02 +/- 1.21E-03 Jy Broad-band 38.2 x 28.3 arcsec integration area. 20032MASX.C.......: 13
14 H 10.575 +/- 0.024 mag 1.82E+14 6.03E-02 +/- 1.35E-03 Jy Broad-band 20032MASX.C.......: 14
15 H_14arcsec (2MASS) 11.007 +/- 0.007 mag 1.82E+14 4.05E-02 +/- 2.62E-04 Jy Broad-band 14.0 x 14.0 arcsec aperture. 20032MASX.C.......: 15
16 H (2MASS/FLWO) 11.691 +/- 0.055 mag 1.80E+14 2.16E-02 +/- 1.09E-03 Jy Broad-band Profile-fit; Poor quality 2006AJ....131.1163S 16
17 H (2MASS/FLWO) 11.334 +/- 0.007 mag 1.80E+14 3.00E-02 +/- 1.93E-04 Jy Broad-band 4" aperture 2006AJ....131.1163S 17
18 K_s (2MASS/FLWO) 10.992 +/- 0.01 mag 1.39E+14 2.67E-02 +/- 2.46E-04 Jy Broad-band 4" aperture 2006AJ....131.1163S 18
19 K_s (2MASS/FLWO) 11.242 +/- 0.036 mag 1.39E+14 2.12E-02 +/- 7.04E-04 Jy Broad-band Profile-fit; Poor quality 2006AJ....131.1163S 19
20 K_s 10.326 +/- 0.033 mag 1.38E+14 4.94E-02 +/- 1.52E-03 Jy Broad-band 38.2 x 28.3 arcsec integration area. 20032MASX.C.......: 20
21 K_s 10.242 +/- 0.029 mag 1.38E+14 5.34E-02 +/- 1.44E-03 Jy Broad-band 20032MASX.C.......: 21
22 K_s_14arcsec (2MASS) 10.659 +/- 0.009 mag 1.38E+14 3.63E-02 +/- 3.02E-04 Jy Broad-band 14.0 x 14.0 arcsec aperture. 20032MASX.C.......: 22
23 12 microns (IRAS) 7.588E-02 +/- 19 % Jy 2.50E+13 7.59E-02 +/- 1.44E-02 Jy Broad-band IRAS quality flag = 2 1990IRASF.C...0000M 23
24 25 microns (IRAS) 7.433E-02 +/- 19 % Jy 1.20E+13 7.43E-02 +/- 1.44E-02 Jy Broad-band IRAS quality flag = 2 1990IRASF.C...0000M 24
25 60 microns (IRAS) 7.517E-01 +/- 5 % Jy 5.00E+12 7.52E-01 +/- 3.76E-02 Jy Broad-band IRAS quality flag = 3 1990IRASF.C...0000M 25
26 100 microns (IRAS) 1.954E+00 +/- 10 % Jy 3.00E+12 1.95E+00 +/- 1.95E-01 Jy Broad-band IRAS quality flag = 2 1990IRASF.C...0000M 26
27 170 microns (ISO) 2.84 +/- 30 % Jy 1.76E+12 2.84E+00 +/- 8.52E-01 Jy Broad-band 2004A&A...422...39S 27
28 HI (21 cm line) 14.58 +/- 0.30 m_21 mag 1.42E+09 6.43E+04 +/- 2.04E+04 Jy-Hz Line m_21 equiv. to S(HI) = 6.427E-22 W m^-2 1991RC3.9.C...0000d 28
29 1.4GHz 6.7 +/- 0.5 milliJy 1.40E+09 6.70E-03 +/- 5.00E-04 Jy Broad-band 1998AJ....115.1693C 29
30 1.4 GHz (VLA) 6.2 ... milliJy 1.40E+09 6.20E-03 ... Jy Broad-band 2002AJ....124..675C 30


Detailed Information for Each Entry

 No. 1
Reference Code : 2012GASC..C...0000S
Freq. targeted : FUV (GALEX) AB      
Measurement    :  18.0076     mag                  = 2.28E-30 W m^-2^ Hz^-1^
Uncertainty    :  0.0540041   mag                  = 1.13E-31
Significance   : uncertainty
Freq or Vel.   : 1538.6       A            (OBS   )= 1.95E+15 Hz
Frequency mode : Broad-band measurement
Coord. targeted: 267.50322796074 61.531651679696 (J2000)
Spatial mode   : Flux integrated from map
Notes          : From new raw data
Qualifiers     : Kron flux in elliptical aperture        

No. 2 Reference Code : 2012GASC..C...0000S Freq. targeted : FUV (GALEX) AB Measurement : 20.3502 mag = 2.63E-31 W m^-2^ Hz^-1^ Uncertainty : 0.156480 mag = 3.79E-32 Significance : uncertainty Freq or Vel. : 1538.6 A (OBS )= 1.95E+15 Hz Frequency mode : Broad-band measurement Coord. targeted: 267.50322796074 61.531651679696 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : Flux in 7.5 arcsec diameter aperture
No. 3 Reference Code : 2012GASC..C...0000S Freq. targeted : NUV (GALEX) AB Measurement : 17.4712 mag = 3.73E-30 W m^-2^ Hz^-1^ Uncertainty : 0.0290534 mag = 9.98E-32 Significance : uncertainty Freq or Vel. : 2315.7 A (OBS )= 1.29E+15 Hz Frequency mode : Broad-band measurement Coord. targeted: 267.50322796074 61.531651679696 (J2000) Spatial mode : Flux integrated from map Notes : From new raw data Qualifiers : Kron flux in elliptical aperture
No. 4 Reference Code : 2012GASC..C...0000S Freq. targeted : NUV (GALEX) AB Measurement : 19.5809 mag = 5.34E-31 W m^-2^ Hz^-1^ Uncertainty : 0.0771253 mag = 3.79E-32 Significance : uncertainty Freq or Vel. : 2315.7 A (OBS )= 1.29E+15 Hz Frequency mode : Broad-band measurement Coord. targeted: 267.50322796074 61.531651679696 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : Flux in 7.5 arcsec diameter aperture
No. 5 Reference Code : 1991RC3.9.C...0000d Freq. targeted : B (m_B) Measurement : 14.53 mag = 6.57E-29 W m^-2^ Hz^-1^ Uncertainty : 0.18 mag = 1.18E-29 Significance : rms uncertainty Freq or Vel. : 4400 A (OBS )= 6.81E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 174930.6 +613238 (B1950) Spatial mode : Multiple methods Notes : Homogenized from new and previously published data; Standard Johnson UBVRI filters assumed Qualifiers :
No. 6 Reference Code : 1991RC3.9.C...0000d Freq. targeted : B (m_B^0) Measurement : 13.85 mag = 1.23E-28 W m^-2^ Hz^-1^ Uncertainty : mag = 0.00E+00 Significance : no uncertainty reported Freq or Vel. : 4400 A (OBS )= 6.81E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 174930.6 +613238 (B1950) Spatial mode : Multiple methods Notes : Homogenized from new and previously published data; Extinction-corrected for internal and Milky Way and K-correction applied; Standard Johnson UBVRI filters assumed Qualifiers :
No. 7 Reference Code : 1968CGCG4.C...0000Z Freq. targeted : m_p Measurement : 14.5 mag = 6.75E-29 W m^-2^ Hz^-1^ Uncertainty : 0.4 mag = 3.01E-29 Significance : rms noise Freq or Vel. : 4400 A (OBS )= 6.81E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 174930.0 +613200. (B1950) Spatial mode : Estimated by eye Notes : From new raw data Qualifiers :
No. 8 Reference Code : 2006AJ....131.1163S Freq. targeted : J (2MASS/FLWO) Measurement : 12.492 mag = 1.61E-28 W m^-2^ Hz^-1^ Uncertainty : 0.047 mag = 6.95E-30 Significance : uncertainty Freq or Vel. : 1.235 microns (OBS )= 2.43E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : Profile-fit; Poor quality
No. 9 Reference Code : 2006AJ....131.1163S Freq. targeted : J (2MASS/FLWO) Measurement : 12.106 mag = 2.29E-28 W m^-2^ Hz^-1^ Uncertainty : 0.006 mag = 1.27E-30 Significance : uncertainty Freq or Vel. : 1.235 microns (OBS )= 2.43E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : 4" aperture
No. 10 Reference Code : 20032MASX.C.......: Freq. targeted : J Measurement : 11.290 mag = 4.85E-28 W m^-2^ Hz^-1^ Uncertainty : 0.020 mag = 9.02E-30 Significance : 1 sigma uncert. Freq or Vel. : 1.25 microns (OBS )= 2.40E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 175000.70 +613154.4 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers :
No. 11 Reference Code : 20032MASX.C.......: Freq. targeted : J_14arcsec (2MASS) Measurement : 11.754 mag = 3.16E-28 W m^-2^ Hz^-1^ Uncertainty : 0.006 mag = 1.75E-30 Significance : 1 sigma uncert. Freq or Vel. : 1.25 microns (OBS )= 2.40E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 175000.70 +613154.4 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : 14.0 x 14.0 arcsec aperture.
No. 12 Reference Code : 20032MASX.C.......: Freq. targeted : J Measurement : 11.407 mag = 4.36E-28 W m^-2^ Hz^-1^ Uncertainty : 0.018 mag = 7.28E-30 Significance : 1 sigma uncert. Freq or Vel. : 1.25 microns (OBS )= 2.40E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 175000.70 +613154.4 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : 38.2 x 28.3 arcsec integration area.
No. 13 Reference Code : 20032MASX.C.......: Freq. targeted : H Measurement : 10.690 mag = 5.42E-28 W m^-2^ Hz^-1^ Uncertainty : 0.024 mag = 1.21E-29 Significance : 1 sigma uncert. Freq or Vel. : 1.65 microns (OBS )= 1.82E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 175000.70 +613154.4 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : 38.2 x 28.3 arcsec integration area.
No. 14 Reference Code : 20032MASX.C.......: Freq. targeted : H Measurement : 10.575 mag = 6.03E-28 W m^-2^ Hz^-1^ Uncertainty : 0.024 mag = 1.35E-29 Significance : 1 sigma uncert. Freq or Vel. : 1.65 microns (OBS )= 1.82E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 175000.70 +613154.4 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers :
No. 15 Reference Code : 20032MASX.C.......: Freq. targeted : H_14arcsec (2MASS) Measurement : 11.007 mag = 4.05E-28 W m^-2^ Hz^-1^ Uncertainty : 0.007 mag = 2.62E-30 Significance : 1 sigma uncert. Freq or Vel. : 1.65 microns (OBS )= 1.82E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 175000.70 +613154.4 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : 14.0 x 14.0 arcsec aperture.
No. 16 Reference Code : 2006AJ....131.1163S Freq. targeted : H (2MASS/FLWO) Measurement : 11.691 mag = 2.16E-28 W m^-2^ Hz^-1^ Uncertainty : 0.055 mag = 1.09E-29 Significance : uncertainty Freq or Vel. : 1.662 microns (OBS )= 1.80E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : Profile-fit; Poor quality
No. 17 Reference Code : 2006AJ....131.1163S Freq. targeted : H (2MASS/FLWO) Measurement : 11.334 mag = 3.00E-28 W m^-2^ Hz^-1^ Uncertainty : 0.007 mag = 1.93E-30 Significance : uncertainty Freq or Vel. : 1.662 microns (OBS )= 1.80E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : 4" aperture
No. 18 Reference Code : 2006AJ....131.1163S Freq. targeted : K_s (2MASS/FLWO) Measurement : 10.992 mag = 2.67E-28 W m^-2^ Hz^-1^ Uncertainty : 0.01 mag = 2.46E-30 Significance : uncertainty Freq or Vel. : 2.159 microns (OBS )= 1.39E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : 4" aperture
No. 19 Reference Code : 2006AJ....131.1163S Freq. targeted : K_s (2MASS/FLWO) Measurement : 11.242 mag = 2.12E-28 W m^-2^ Hz^-1^ Uncertainty : 0.036 mag = 7.04E-30 Significance : uncertainty Freq or Vel. : 2.159 microns (OBS )= 1.39E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : Profile-fit; Poor quality
No. 20 Reference Code : 20032MASX.C.......: Freq. targeted : K_s Measurement : 10.326 mag = 4.94E-28 W m^-2^ Hz^-1^ Uncertainty : 0.033 mag = 1.52E-29 Significance : 1 sigma uncert. Freq or Vel. : 2.17 microns (OBS )= 1.38E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 175000.70 +613154.4 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : 38.2 x 28.3 arcsec integration area.
No. 21 Reference Code : 20032MASX.C.......: Freq. targeted : K_s Measurement : 10.242 mag = 5.34E-28 W m^-2^ Hz^-1^ Uncertainty : 0.029 mag = 1.44E-29 Significance : 1 sigma uncert. Freq or Vel. : 2.17 microns (OBS )= 1.38E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 175000.70 +613154.4 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers :
No. 22 Reference Code : 20032MASX.C.......: Freq. targeted : K_s_14arcsec (2MASS) Measurement : 10.659 mag = 3.63E-28 W m^-2^ Hz^-1^ Uncertainty : 0.009 mag = 3.02E-30 Significance : 1 sigma uncert. Freq or Vel. : 2.17 microns (OBS )= 1.38E+14 Hz Frequency mode : Broad-band measurement Coord. targeted: 175000.70 +613154.4 (J2000) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : 14.0 x 14.0 arcsec aperture.
No. 23 Reference Code : 1990IRASF.C...0000M Freq. targeted : 12 microns (IRAS) Measurement : 7.588E-02 Jy = 7.59E-28 W m^-2^ Hz^-1^ Uncertainty : 19 % Jy = 1.44E-28 Significance : uncertainty Freq or Vel. : 12 microns (OBS )= 2.50E+13 Hz Frequency mode : Broad-band measurement Coord. targeted: 174929.5 +613239 (B1950) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : IRAS quality flag = 2
No. 24 Reference Code : 1990IRASF.C...0000M Freq. targeted : 25 microns (IRAS) Measurement : 7.433E-02 Jy = 7.43E-28 W m^-2^ Hz^-1^ Uncertainty : 19 % Jy = 1.44E-28 Significance : uncertainty Freq or Vel. : 25 microns (OBS )= 1.20E+13 Hz Frequency mode : Broad-band measurement Coord. targeted: 174929.5 +613239 (B1950) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : IRAS quality flag = 2
No. 25 Reference Code : 1990IRASF.C...0000M Freq. targeted : 60 microns (IRAS) Measurement : 7.517E-01 Jy = 7.52E-27 W m^-2^ Hz^-1^ Uncertainty : 5 % Jy = 3.76E-28 Significance : uncertainty Freq or Vel. : 60 microns (OBS )= 5.00E+12 Hz Frequency mode : Broad-band measurement Coord. targeted: 174929.5 +613239 (B1950) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : IRAS quality flag = 3
No. 26 Reference Code : 1990IRASF.C...0000M Freq. targeted : 100 microns (IRAS) Measurement : 1.954E+00 Jy = 1.95E-26 W m^-2^ Hz^-1^ Uncertainty : 10 % Jy = 1.95E-27 Significance : uncertainty Freq or Vel. : 100 microns (OBS )= 3.00E+12 Hz Frequency mode : Broad-band measurement Coord. targeted: 174929.5 +613239 (B1950) Spatial mode : Flux in fixed aperture Notes : From new raw data Qualifiers : IRAS quality flag = 2
No. 27 Reference Code : 2004A&A...422...39S Freq. targeted : 170 microns (ISO) Measurement : 2.84 Jy = 2.84E-26 W m^-2^ Hz^-1^ Uncertainty : 30 % Jy = 8.52E-27 Significance : uncertainty Freq or Vel. : 170 microns (OBS )= 1.76E+12 Hz Frequency mode : Broad-band measurement Coord. targeted: 17 49 57.92 +61 32 02.7 (J2000) Spatial mode : Integrated from scans Notes : Averaged from previously published data Qualifiers :
No. 28 Reference Code : 1991RC3.9.C...0000d Freq. targeted : HI (21 cm line) Measurement : 14.58 m_21 mag = 6.43E-22 W m^-2^ Uncertainty : 0.30 m_21 mag = 2.04E-22 Significance : rms uncertainty Freq or Vel. : 21 cm (REST )= 1.42E+09 Hz Frequency mode : Line measurement; flux integrated over line; lines measured in emission Coord. targeted: 174930.6 +613238 (B1950) Spatial mode : Multiple methods Notes : Homogenized from new and previously published data Qualifiers : m_21 equiv. to S(HI) = 6.427E-22 W m^-2
No. 29 Reference Code : 1998AJ....115.1693C Freq. targeted : 1.4GHz Measurement : 6.7 milliJy = 6.70E-29 W m^-2^ Hz^-1^ Uncertainty : 0.5 milliJy = 5.00E-30 Significance : uncertainty Freq or Vel. : 1.40 GHz (OBS )= 1.40E+09 Hz Frequency mode : Broad-band measurement Coord. targeted: 17 50 0.79 +61 31 51.2 (J2000) Spatial mode : Flux integrated from map Notes : From new raw data Qualifiers :
No. 30 Reference Code : 2002AJ....124..675C Freq. targeted : 1.4 GHz (VLA) Measurement : 6.2 milliJy = 6.20E-29 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: Spatial mode : Flux integrated from map Notes : Averaged from previously published data Qualifiers :

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