OH in the diffuse interstellar medium: physical modelling and prospects with upcoming SKA precursor/pathfinder surveys

@article{Balashev2021OHIT,
  title={OH in the diffuse interstellar medium: physical modelling and prospects with upcoming SKA precursor/pathfinder surveys},
  author={S. A. Balashev and Neeraj Gupta and D N Kosenko},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2021},
  volume={504},
  pages={3797-3811}
}
Hydroxyl ($\rm OH$) is known to form efficiently in cold gas ($T\sim 100$K) along with the molecule $\rm H_2$ and can be used as an efficient tracer of the diffuse molecular gas in the interstellar medium (ISM). Using a simple formalism describing the $\rm H\,I/H_2$ transition and a reduced network of major chemical reactions, we present a semi-analytical prescription to estimate the abundances of O-bearing molecules in the diffuse ISM. We show that predictions based on our prescription are in… 
1 Citations

Figures and Tables from this paper

Evolution of Cold Gas at 2 < z < 5: A Blind Search for H i and OH Absorption Lines toward Mid-infrared Color-selected Radio-loud AGN
We present results from a spectroscopically blind search for associated and intervening H i 21 cm and OH 18 cm absorption lines toward 88 active galactic nuclei (AGN) at 2 ≤ z ≤ 5 using the uGMRT.

References

SHOWING 1-10 OF 92 REFERENCES
Where is OH and Does It Trace the Dark Molecular Gas (DMG)
Hydroxyl (OH) is expected to be abundant in diffuse interstellar molecular gas as it forms along with $H_2$ under similar conditions and within a similar extinction range. We have analyzed absorption
Discovery of OH Absorption from a Galaxy at z ∼ 0.05: Implications for Large Surveys with SKA Pathfinders
We present the first detection of OH absorption in diffuse gas at $z>0$, along with another eight stringent limits on OH column densities for cold atomic gas in galaxies at $0 $13.6) to be $n_{\rm
Revealing H I gas in emission and absorption on pc to kpc scales in a galaxy at z~0.017
We present a detailed study of the quasar-galaxy pair: J1243+4043-UGC 07904. The sight line of the background quasar (z(q) = 1.5266) passes through a region of the galaxy (z(g) = 0.0169) at an impact
Multiwavelength observations of cirrus clouds in the North Celestial Loop: a study of the OH emission
New 1665- and 1667-MHz OH observations were made with the Green Bank Telescope at an angular resolution of 7 arcmin of 108 locations over two diffuse gas clouds at high Galactic latitude. A linear
Thermal Phases of the Neutral Atomic Interstellar Medium -- from Solar Metallicity to Primordial Gas
We study the thermal structure of the neutral atomic (H {\small I}) interstellar medium across a wide range of metallicities, from supersolar down to vanishing metallicity, and for varying UV
Photodissociation and photoionisation of atoms and molecules of astrophysical interest
A new collection of photodissociation and photoionisation cross sections for 102 atoms and molecules of astrochemical interest has been assembled, along with a brief review of the basic processes
2016, in MeerKAT Science: On the Pathway to the SKA
  • 2016
An HST/COS survey of molecular hydrogen in DLAs & sub-DLAs at z < 1: molecular fraction and excitation temperature
We present the results of a systematic search for molecular hydrogen (H2) in low redshift (0.05 . z . 0.7) damped and sub-damped Lyabsorption systems (DLAs/sub-DLAs) with N(H I) & 10 19.0 cm 2 , in
Observations of hydroxyl in early-type galaxies
We used Arecibo Observatory and the Green Bank Telescope to observe OH in twelve early type galaxies with known reservoirs of dense gas. We present three new detections of OH in absorption in the
H I-TO-H2 TRANSITIONS AND H I COLUMN DENSITIES IN GALAXY STAR-FORMING REGIONS
We present new analytic theory and radiative transfer computations for the atomic-to-molecular (H I-to-H{sub 2}) transitions and the buildup of atomic hydrogen (H I) gas columns in optically thick
...
1
2
3
4
5
...