A pilot search for extragalactic OH absorption with FAST

@article{Zheng2020APS,
  title={A pilot search for extragalactic OH absorption with FAST},
  author={Zheng Zheng and Di Li and Elaine M. Sadler and James R. Allison and Ning-yu Tang},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2020}
}
  • Zheng Zheng, Di Li, N. Tang
  • Published 1 October 2020
  • Physics
  • Monthly Notices of the Royal Astronomical Society
OH absorption is currently the only viable way to detect OH molecules in non-masing galaxies at cosmological distances. There have been only six such detections at z > 0.05 to date and so it is hard to put a statistically robust constraint on OH column densities in distant galaxies. We carried out a pilot OH absorption survey towards eight associated and one intervening H i 21-cm absorbers using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). We were able to constrain the OH… 

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References

SHOWING 1-10 OF 53 REFERENCES

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 < z < 0.4. The absorbing

Constraints on changes in fundamental constants from a cosmologically distant OH absorber or emitter.

TLDR
The four 18 cm OH lines from the z approximaetely 0.765 gravitational lens toward PMN J0134-0931 are detected, providing a laboratory to test the evolution of fundamental constants over a large lookback time.

Detection of OH and wide Hi absorption toward B0218+357

We present deep Giant Metrewave Radio Telescope (GMRT) OH and Westerbork Synthesis Radio Telescope (WSRT) H I absorption spectra of the z = 0.6846 gravitational lens toward B0218 + 357. Both the

Probing the gas content of radio galaxies through H I absorption stacking

Using the Westerbork Synthesis Radio Telescope, we carried out shallow H i absorption observations of a flux-selected (S1.4 GHz > 50 mJy) sample of 93 radio active galactic nuclei (AGN), which have

A Search for Intrinsic H i 21 cm and OH 18 cm Absorption toward Compact Radio Sources

We present the results of a large search for intrinsic H i 21 cm and OH 18 cm absorption in 145 compact radio sources in the redshift range 0.02 < z < 3.8 with the Green Bank Telescope. We redetect H

H i 21-cm absorption survey of quasar-galaxy pairs: Distribution of cold gas around z < 0.4 galaxies

We present the results from our survey of HI 21-cm absorption, using GMRT, VLA and WSRT, in a sample of 55 z<0.4 galaxies towards radio sources with impact parameters (b) in the range ~0-35 kpc. In

The evolution of neutral hydrogen over the past 11 Gyr via H i 21 cm absorption

We present the results of a blind search for intervening HI 21 cm absorption toward 260 radio sources in the redshift range 0<z<2.74 with the Green Bank Telescope. The survey has the sensitivity to

Molecular gas at intermediate redshifts

We present Giant Metrewave Radio Telescope (GMRT) observations of OH absorption in B3 1504+377 ($z \sim 0.673$) and PKS 1413+135 ($z \sim 0.247$). OH has now been detected in absorption towards four

THE STRUCTURE OF DARK MOLECULAR GAS IN THE GALAXY. I. A PILOT SURVEY FOR 18 cm OH EMISSION TOWARD l≈ 105°, b≈ +1°

We report the first results from a survey for 1665, 1667, and 1720 MHz OH emission over a small region of the Outer Galaxy centered at l ≈ 105 &fdg; 0 , b ≈ + 1 &fdg; 0 ?> . This sparse,

A comparative study of intervening and associated H I 21-cm absorption profiles in redshifted galaxies

The star-forming reservoir in the distant Universe can be detected through H I 21-cm absorption arising from either cool gas associated with a radio source or from within a galaxy intervening the
...