Radial velocities estimation

[Jacques Montier]

Hello all,

My purpose was to evaluate the radial velocities of some astronomical targets with Alpy600 spectra and to compare them with Simbad data.

Hardware

Meade ACF 14" telescope + focal reducer 0.7
Alpy600 + Atik 460EX 1x1 binning

The targets

- M97 planetary nebula V 15.777 (6x600s exposure)
- NGC 4151 Seyfert 1 galaxy V 11.48 (6x600s exposure)
- 2XMM J121417.6+140313 quasar V 14.19 (6x600s exposure)

Spectra

M97 and NGC 4151

20170421_m97_ngc4151.png (102.12 KiB) Viewed 3971 times

M97 and 2XMM J121417.6+140313 quasar

20170421_m97_quasar.png (103.84 KiB) Viewed 3971 times

Results

M97.jpg (85.1 KiB) Viewed 3971 times

Radial velocity V = 5 +- 133 km/s in agreement with Simbad data (0 km/s)

NGC4151.jpg (98.7 KiB) Viewed 3971 times

Radial velocity V = 906 +- 93 km/s in agreement with Simbad data (978 km/s)

quasar.jpg (81.3 KiB) Viewed 3971 times

Radial velocity V = 24470 +- 467 km/s in agreement with Simbad data (24253 km/s)

It's alwas pleasant and reassuring to see amateur measures in agreement with profesionnal data

Cheers,

[HughAllen]

Wonderful spectra Jacques. What are the critical steps you take to ensure the most accurate calibration of your Alpy spectra?
Cheers
Hugh

[Jacques Montier]

Thank you Hugh,

For getting the most accurate calibration with Isis, you just have to follow the very useful and clear Christian Buil web page
http://www.astrosurf.com/buil/isis/guid ... ration.htm
Take a look at the METHOD 3: Mixed method: star + ArNe lamp
It works very well.

Cheers,