Astrophysical: H II regions

  • Publication
    Faint Emission Lines and Temperature Fluctuations in M8
    We present echelle spectroscopy in the 3500-10300 Å range of the Hourglass Nebula, which is embedded in the Galactic H II region M8. The data were obtained...
  • Publication
    Faint emission lines in M16, M20, NGC 3603 (Garcia-Rojas+, 2006)
    The observations were made on 2003 March 29, 30 and 31 with UVES, at the VLT Kueyen Telescope in Cerro Paranal Observatory (Chile). We used the standard...
  • Publication
    Fluorescence of [Fe II] in H II regions
    A study of [Fe Ii] lines at various positions within the H Ii regions M42 and M43 is presented. The relative intensities of selected optical [Fe Ii] lines are...
  • Publication
    Fluorescent Excitation of Balmer Lines in Gaseous Nebulae: Case D
    Nonionizing stellar continua are a potential source of photons for continuum pumping in the hydrogen Lyman transitions. In the environments where these...
  • Publication
    Gas flow, population structure and starburst activity in the central zone of NGC 4736
    The Sb galaxy NGC 4736 has a well observed ring of bright HII regions just outside its bulge, at some 1.3 kpc from the nucleus, with an apparent expansion...
  • Publication
    Gas physical conditions and kinematics of the giant outflow Ou4
    Context. The recently discovered bipolar outflow Ou4 has a projected size of more than one degree in the plane of the sky. It is apparently centred on the young...
  • Publication
    GOYA Survey: Mergers up to z = 1 in B- and Ks-selected samples
    In this work we present merger fractions from galaxy samples selected by either Ks-luminosity, or B-band luminosity, from the GOYA photometric survey of the...
  • Publication
    Gradients of chemical abundances in the Milky Way from H II regions: distances derived from Gaia EDR3 parallaxes and temperature inhomogeneities
    We present a reassessment of the radial abundance gradients of He, C, N, O, Ne, S, Cl, and Ar in the Milky Way using the deep optical spectra of 42 H II regions...
  • Publication
    H II region spectroscopy and two dimensional stellar photometry of the barred Seyfert NGC 1566
    Radial velocities of 14 H II regions were obtained using reticon spectroscopy at H-alpha for the barred spiral NGC 1566. The same spectra also yield N II/H and...