Molecular Cloudlets Embedded in a Diffuse H i Cloud within 120 Parsecs of the Sun

Bibcode
1996ApJ...457..731T
DOI
10.1086/176767
Trapero, Joaquin; Sempere, Maria J.; Beckman, J. E.; Hobbs, L. M.
Bibliographical reference

Astrophysical Journal v.457, p.731

Advertised on:
2
1996
Number of authors
4
IAC number of authors
1
Citations
4
Refereed citations
4
Description
Two molecular cloudlets have been detected and mapped in a partial survey of 12CO emission in a diffuse H I cloud toward Perseus. Previous observations of K I absorption and 21 cm emission had shown that the cloud is within 120 pc of the Sun, with a diameter of 14 pc, a total mass 1500 Msun, and temperatures as low as 30 K, making it a good candidate to contain molecular gas. The two cloudlets embedded in the H I cloud have diameters ˜1 pc, molecular densities 100 cm-3, and molecular masses of only 1 Msun, and lie in front of the two stars with the strongest detected K I absorption. The derived total hydrogen column density is 1 x 1021 cm-2 The molecular cores detected are not virialized but confined by the turbulent pressure of the interstellar medium. No 12CO was detected along the lines of sight to eight stars showing K I absorption, or in the direction of the biggest concentration of H I.
Type
Refereed
Clouds

It may interest you

  • Refereed
    Euclid preparation. XXXVI. Modelling the weak lensing angular power spectrum

    This work considers which higher order modeling effects on the cosmic shear angular power spectra must be taken into account for Euclid. We identified the relevant terms and quantified their individual and cumulative impact on the cosmological parameter inferences from Euclid. We computed the values of these higher order effects using analytic

    Euclid Collaboration et al.

    Advertised on:

    4
    2024
    Bibcode
    2024A&A...684A.138E
    Citations
    4
  • Refereed
    The discovery space of ELT-ANDES. Stars and stellar populations

    The ArmazoNes high Dispersion Echelle Spectrograph (ANDES) is the optical and near-infrared high-resolution echelle spectrograph envisioned for the Extremely Large Telescope (ELT). We present a selection of science cases, supported by new calculations and simulations, where ANDES could enable major advances in the fields of stars and stellar

    Roederer, Ian U. et al.

    Advertised on:

    4
    2024
    Bibcode
    2024ExA....57...17R
    Citations
    0
  • Refereed
    Euclid preparation. XXXVII. Galaxy colour selections with Euclid and ground photometry for cluster weak-lensing analyses

    Aims: We derived galaxy colour selections from Euclid and ground-based photometry, aiming to accurately define background galaxy samples in cluster weak-lensing analyses. These selections have been implemented in the Euclid data analysis pipelines for galaxy clusters. Methods: Given any set of photometric bands, we developed a method for the

    Euclid Collaboration et al.

    Advertised on:

    4
    2024
    Bibcode
    2024A&A...684A.139E
    Citations
    2