O ] and [ S ] / [ O ] : well - behaved oxygen abundance indicators for HII regions and star forming galaxies
نویسنده
چکیده
We propose two statistical methods to derive oxygen abundances in HII regions and star forming galaxies and calibrate them with a sample of several hundred giant HII regions in spiral and blue compact galaxies as well as of galaxies from the Sloan Digital Sky Survey. We show the advantages of our new abundance indicators over previous ones.
منابع مشابه
Oxygen and Nitrogen in Leo a and Gr 8
We present elemental abundances for multiple HII regions in Leo A and GR 8 obtained from long slit optical spectroscopy of these two nearby low luminosity dwarf irregular galaxies. As expected from their luminosities, and in agreement with previous observations, the derived oxygen abundances are extremely low in both galaxies. High signal-to-noise ratio observations of a planetary nebula in Leo...
متن کاملUv Hst Spectroscopy of Star-forming Galaxies
to be published in the " Starburst Activity in Galaxies " proceedings by the RevMexAstronAstrofis. ABSTRACT HST spectroscopical observations of 8 HII galaxies are reported. Lyα emission was detected in 4 of them. We find that it is the velocity structure of the gas which is the main determining factor for the escape of the Lyα photons, and not the abundance of dust. The rest of the sample shows...
متن کاملThe Oxygen Abundance Calibrations and N/o Abundance Ratios of ∼ 40,000 Sdss Star-forming Galaxies
Using a large sample of 38,478 star-forming galaxies selected from the Second Data Release of the Sloan Digital Sky Survey database (SDSS-DR2), we derive analytical calibrations for oxygen abundances from several metallicity-sensitive emission-line ratios: [N ii]/Hα, [O iii]/[N ii], [N ii]/[O ii], [N ii]/[S ii], [S ii]/Hα, and [O iii]/Hβ. This consistent set of strong-line oxygen abundance cali...
متن کاملLine temperatures and elemental abundances in HII galaxies
We present long-slit spectrophotometric observations in the red and near infrared of 12 HII galaxies. The spectral range includes the sulphur lines [SII] at λλ 6716, 6731 Å and [SIII] at λ 6312 Å and λλ 9069, 9532 Å. For all of the observed galaxies, at least three ion-weighted temperatures from forbidden auroral to nebular line ratios have been obtained and the relations between the different ...
متن کاملSpectroscopic study of blue compact galaxies V . oxygen abundance and the metallicity - luminosity relation
This is the fifth paper in a series studying the stellar components, star formation histories, star formation rates and metallicities of a blue compact galaxy (BCG) sample. Based on our high-quality groundbased spectroscopic observations, we have determined the electron temperatures, electron densities, nitrogen abundances and oxygen abundances for 72 star-forming BCGs in our sample, using diff...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2006