Observed Spectral profile of NGC4051
| Date & Time: | Feb 25 2023, from 21:51 to 22:12 JST(+0900) |
| Composed 3 shots with 10 minutes exposed |
| Optical: | Meade 25cm(10") Schmidt Cassegrain (f=2500mm, F10.0) |
| with SBIG DSS7 Spectrometer |
| Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN |
| Cooled CCD Camera: | SBIG ST-402ME (Temp.: -25°C) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
Upper strip: taken spectrogram, Lower strip: stretched 3-pixel-width & pseudo-colored image
| Emission line | Hα | Hβ | Hγ | O III | O III |
|---|
| Observed WL, λm | 6574 Å | 4868 Å | 4355 Å | 4966 Å | 5014.7 Å |
| WL in literature, λ0 | 6562.9 Å | 4861.3 Å | 4340.5 Å | 4959 Å | 5007 Å |
| Red shift, z | 1.699×10-3 | 1.372×10-3 | 3.348×10-3 | 1.412×10-3 | 1.538×10-3 |
| Recession velocity, v | 509.2 km/s | 411.3 km/s | 1003 km/s | 423.2 km/s | 461.0 km/s |
| Estimated distance, D | 23.71 Mly | 19.16 Mly | 46.69 Mly | 19.71 Mly | 21.47 Mly |
| (average) | 26.15 Mly |
|---|
z= (λm-λ0)/λ0
v= c*((1+z)2-1)/((1+z)2+1)
D= 3.26*v/H0 (Mly)
(c: velocity of light, H0=70 km/s/Mpc)
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This page shows you the observed spectral profile of the central part of NGC4051.
The profile shows emission line of the ionized oxygen atoms (O-III lines) besides the Balmer series from Hα to Hγ.
A table in right has listed and indicated estimated distance to the galaxy from observed wavelengths.
The value can be calculated as about 26 million light years under an assumption that the Hubble constant of H0 has 70 km/s/Mpc.
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