Density bounding of giant HII regions and the ionization of the diffuse interstellar medium

Bibcode
1998PASA...15...83B
DOI
10.1071/AS98083
Beckman, J. E.; Rozas, M.; Knapen, J. H.
Bibliographical reference

Publications Astronomical Society of Australia, vol. 15, no. 1, p. 83-85

Advertised on:
4
1998
Number of authors
3
IAC number of authors
1
Citations
8
Refereed citations
4
Description
Three different types of evidence are presented in favour of the hypothesis that the HII regions in disk galaxies with H-alpha luminosities greater than a critical value of 10^(38.6)^ erg s^(-1)^ are density bounded, and that the escaping Lyman continuum photons from these are the principal ionizing agents for the diffuse ISM in disk galaxies. This has important implications for the ionization of the intergalactic medium, and for computed star formation rates in spirals.
Type
Refereed
Interstellar medium
Intergalactic medium
Spiral galaxies

It may interest you

  • Refereed
    Constraining the TeV gamma-ray emission of SN 2024bch, a possible type IIn-L from a red supergiant progenitor: Multiwavelength observations and analysis of the progenitor
    We present very high-energy optical photometry and spectroscopic observations of SN 2024bch in the nearby galaxy NGC 3206 (∼20 Mpc). We used gamma-ray observations performed with the first Large-Sized Telescope (LST-1) of the Cherenkov Telescope Array Observatory (CTAO) and optical observations with the Liverpool Telescope (LT) combined with data
    Abe, K. et al.

    Advertised on:

    10
    2025
    Bibcode
    2025A&A...702A.125A
    Citations
    0
  • Refereed
    An ALMA Band 7 survey of SDSS/Herschel quasars in Stripe 82: I. The properties of the 870 micron counterparts
    Context. Over the past 15 years, studies of quasars in the far-infrared (FIR) have reported host luminosities ranging from 10 12 to 10 14 L ⊙. These luminosities, often derived from Herschel/SPIRE photometry, suggest star formation rates (SFRs) of up to several thousand M ⊙ yr ‑1, positioning them among the most luminous starburst galaxies in the
    Hatziminaoglou, E. et al.

    Advertised on:

    10
    2025
    Bibcode
    2025A&A...702A.183H
    Citations
    0
  • Refereed
    Transit timing variations in HIP 41378: CHEOPS and TESS confirm a non-transiting sixth planet in the system
    In multiple-planet systems, gravitational interactions of exoplanets could lead to transit timing variations (TTVs), whose amplitude becomes significantly enhanced when planets are in or near mean-motion resonances (MMRs), making them more easily detectable. In cases where both TTVs and radial velocity (RV) measurements are available, combined
    Leonardi, P. et al.

    Advertised on:

    10
    2025
    Bibcode
    2025A&A...702A.211L
    Citations
    0