spectro-aras.com

Un spectre hier soir de ce fameux quasar ! 2 milliards d'années lumière !

Since I have the LISA in IR mode I decided to try 3C 273 again. The top 3 things that amaze me about this object are the following:

1.) Proves cosmological red-shift in a manner that high-school school mathematics describes.
2.) By implication of distance via red-shift and elimination of any other phenomena, proves ultra-massive black hole powers the cores of galaxies.
[NOTE: If this object were 10 parsecs away, it would be as bright as the sun....more than 4 trillion times the luminosity!---see:https://en.wikipedia.org/wiki/3C_273]
3.) Amateur spectroscopy can readily record and characterize 3C 273's red-shift.

Here is the stitched Alpy600+LISA-IR spectra (Note how the O2 telluric feature at 7,605A bifurcates the shifted Ha line):


Using ISIS in profile mode, I measured the wavelengths corresponding to the peaks of Ha,OIII, Hb, Hy, and Hd intensity to derive the following table
(formatted like Etienne's) using a Hubble constant of 70 Km/s per MPC:


If I can, I'll try for 3C 279 at Mt. Pinos next month. I might also try for the 66 billion solar mass (10.4 billion LY away) black hole TON 618,
but at 15.9 magnitude, it would be a challenge with the LISA and the CDK17!

James

James Foster wrote:If I can, I'll try for 3C 279 at Mt. Pinos next month. I might also try for the 66 billion solar mass (10.4 billion LY away) black hole TON 618,
but at 15.9 magnitude, it would be a challenge with the LISA and the CDK17!

James

Hi James,

Try it, I think it's possible.
Last year I had tried this quasar at 12 billions light years with a LISA and C14 :


Mag around 16,5. We see Lyman Alpha line here with a Z=3,36



And comparison with a spectrum of the same object taken with a bigger telescope.

RE:"....Last year I had tried this quasar at 12 billions light years with a LISA and C14 ..."
What is the balmer line at around 5400A?

A couple of nice things about shooting from Mt. Pinos is the clarity of sky, good seeing,
and ability to shoot good spectra down to almost 2.5 air masses.

The bad thing is the power needed to run a spectroscopic rig away from the home electrical mains. At least 3 large Marine batteries
and a 12v inverter needed to run the calibration lamps, laptop, guide and main camera, mount drive, and electronic finder scope.

James

James Foster wrote: What is the balmer line at around 5400A?
James

Hi James,

This is not a Balmer line, this is Lyman Alpha line (rest line at 1215,7 Å and shifted to 5340 Å with a z=3,36)

Un quasar bien chaud à faire aussi en ce moment c'est QSO 1946+770, un peu en dessous de la petite ourse, magnitude proche de 16.13 idéal pour laisser tourner toute la nuit...
J'ai eu de la difficulté à l'avoir !
Sur 4 poses je n'en ai qu'une seule ou la raie Lyman alpha se détache du fond de ciel je comprends pas trop pourquoi... pourtant j'ai posé longtemps, j'arrive sans doute un peu aux limites de mon C8... sur les 3 autres poses j'ai un continuum mais la raie ne sort pas !!!

Avec l'Alpy et la fente de 23µm, je ne peux pas binner en 2x2 non avec Atik 314L+ et pixels de 6.45µm ? Il n'y aura 1.78 pixels pour l'échantillonnage.. Je retente en binning 2x2 ?