Observed Spectral profile of Quasar 3C273

Date & Time: Apr 13 2013, from 21:35 to 21:51 JST(+0900)
Composed 2 shots with 15 minutes exposed
Optical: Meade 25cm(10") Schmidt Cassegrain (f=2500mm, F10.0)
with SBIG DSS7 Spectrometer
Auto-guided with Meade LX200 Equatorial & Pictor 201 XT
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
Observed WL, λm7569.1 Å5627.8 Å
 WL in literature, λ06562.9 Å4861.3 Å
Red shift, z0.15330.1577
Recession velocity, v4.250×104 km/s4.361×104 km/s
Estimated distance, D1.979 bn. lt-yr2.031 bn. lt-yr
(average)2.005 bn. lt-yr

z= (λm0)/λ0
v= c*((1+z)2-1)/((1+z)2+1)
D= 3.26*v/H0
(million lt-yr)
  (c: velocity of light, H0=70 km/s/Mpc)
This page shows you the observed spectral profile of the Quasar 3C273 with an amateur-oriented spectrometer. The vertical lines in a taken spectral strip are originated from emission lines of atoms and/or molecules in atmosphere and light pollution. The profile has subtracted those influences.
The quasar has two clear emission lines of the Balmer series of hydrogen atoms, the H-alpha and the H-beta. The wavelengths of both lines are shifted in longer side, have extraordinary large red shifts (z-values) exceeding 0.15. A table in right has listed and indicated the estimated distance to the quasar from observed wavelengths. The value can be calculated as about 2 billion light years under an assumption that the Hubble constant of H0 has 70 km/s/Mpc.

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