The new MaxFR emission line filters are suitable for very fast focal ratios. Hi all Following my posting of the Universe Today article where my Ha image of the Horsehead and flame nebula was featured I thought I would have a go and add the other two emission line filters (OIII and SII… explore the optical line ratios for DIG for an unprece-dented number of star-forming galaxies. In this method, the dominant emission line (H-alpha) is assigned to the red channel. Since this emission line is what normally contributes to the red color in normal RGB-filtered images on nebulae, this method leads to an approximation of true color, i.e., emission … Since most of the Hα emission we detect arises from hydrogen recombination, atomic physics dictates a set ratio of Hα to Hβ emission from ionized … The observed optical line emission from HII regions is dominated by the recombination lines of H & He and by the forbidden lines of heavy elements. Section2describes our sample and the emission line measurements; while Sec-tion3.1shows the [Sii]/H vs H relation that illustrates the dominance of DIG in low H regions. Due to the narrow bandwidth and high … Transmission of over 97% with the SII line … Astronomik SII 12nm CCD Filter - 50mm Round Unmounted Features. Physics of the [OII] emission line doublet Young, bright stars are usually embedded in clouds of gas which are photoionized by energetic photons from these stars. I have had the common set of NB filters (Ha, Oiii, Sii) for a while now and have occasionally imaged with them. Narrow Band Imaging - posted in Beginning Deep Sky Imaging: Hello. Here … If you plan to create color images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel. Optical Emission Lines Hβ. The Optolong 6.5nm SII filter can be used in conjunction with H-Alpha and OIII filters for false color emission line images like the Hubble Space Telescope. Section3demon-strates how DIG impact line ratios like [S ii… We present the results of a photometric survey of optical emission line regions in M33. Using data from the Local Group Galaxy Survey (LGGS see Massey et al, 2006)), we created continuum-subtracted H-alpha, [OIII] and [SII] emission line images and used flux contours on the H-alpha images to define emission line … What is missing is cooling by line emission. The new series of Astronomik MaxFR Narrowband-Emissionl ine Filters are perfectly matched to the requirements of astronomical Deep-Sky imaging with fast optical systems with the three most important emission lines of Oxygen (OIII), Hydrogen (H-alpha) and Sulfur (SII… 4. Typical emission line widths in LINERs are 200-400 km s-1, smaller than in Seyfert galaxies and comparable to the stellar rotational velocity in the nucleus.The optical, nonstellar continuum … SII = Blue. The H Balmer line of hydrogen at 6562.8 Åis the best tracer of star formation because in ionization-bounded HII regions, the Balmer emission line … Line Emission Balancing photoelectric heating and recombination heating in a pure hydrogen model predicts too high temperatures for HII regions.