Why are O III lines so prominent in the spectra of emission …
Jan 7, 2017 · Thanks. This is useful, but I'm still struggling to use the facts here to understand OIII intensity being ~75% of Hα when abundance of oxygen is a million times smaller. Should I …
Why the forbidden lines of [OIII],[NII] and [SII],[OII] are sensitive ...
I know, for instance, that if you use the lines [OIII]4363 and [OIII]5007 the electron temperature can be computed. In the same way, the ratio between [OII]3729 and [OII]3726 provides an …
Why does the 3P level in OIII have three energy levels?
Jan 9, 2025 · In my continued quest to understand the 500.7 nm OIII line we observe in astrophotography, I came across this energy diagram for OIII on Wikipedia: The 3P level has …
Trying to understand OIII emissions: Why is Hund's Rule violated?
Jan 8, 2025 · Hund's rule only specifies what the ground state of an atomic system is - high temperatures, electron collisions and other 'pumping' processes can drive the electrons to sit …
What is the O [III]/H$\alpha$ line ratio for Active Galactic Nuclei?
Sep 7, 2020 · If not, I am very sceptical whether there is a reliable, tight $ [OIII]$/$H\alpha$ ratio for AGN. Anyhow, where do you get the relationship between $L_ {bol}$ and the $O [III]$ flux …
What does the ']' in the spectral line "CIII] 1909 Å" mean?
The "double Lambda", in the example you provided, is a 'half doublet'. A doublet for that element would be OIII]λλ1661,1666 another example would be SiIII]λλ1882,1892. One paper where …
How can someone take narrowband data from an OSC …
May 8, 2023 · To those who aren’t aware, an OSC narrowband filter is a filter with multiple band passes, for different emission lines. These can include a combination of Hα, Hβ, OIII, SII, and …
telescope - How useful are filters for spotting nebulae?
Feb 27, 2016 · The OIII filter is a narrowband filter, meaning it cuts all light except at a very narrow wavelength range from ionized oxygen. Very often OIII filters make the difference …
Why is [O III] a good density probe in interstellar medium?
Measuring a line strength ratio is important because the ratio will be independent of the abundance of OIII. The ratio will depend on electron density, providing the electron density is …
amateur observing - Astronomy Stack Exchange
Aug 26, 2016 · I took around 3 hours of data (around 1h for Ha, SII and OIII). Then after stacking did an LRGB combination in PixInsight using Ha for red, SII for green and OIII for blue. For …