DICKE’S SUPERRADIANCE IN ASTROPHYSICS. II. THE OH 1612 MHz LINE

@article{Rajabi2016DICKESSI,
  title={DICKE’S SUPERRADIANCE IN ASTROPHYSICS. II. THE OH 1612 MHz LINE},
  author={Fereshteh Rajabi and Martin Houde},
  journal={The Astrophysical Journal},
  year={2016},
  volume={828}
}
We apply the concept of superradiance that was introduced by Dicke in 1954 to the OH molecule 1612 MHz spectral line, which is often used for the detection of masers in the circumstellar envelopes of evolved stars. Because the detection of 1612 MHz OH masers in the outer shells of envelopes of these stars implies the existence of a population inversion and a high level of velocity coherence, and that these are two necessary requirements for superradiance, we investigate whether superradiance… 

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References

SHOWING 1-10 OF 36 REFERENCES

DICKE’S SUPERRADIANCE IN ASTROPHYSICS. I. THE 21 cm LINE

We have applied the concept of superradiance introduced by Dicke in 1954 to astrophysics by extending the corresponding analysis to the magnetic dipole interaction characterizing the atomic hydrogen

Evolution of 1612-MHz maser emission in expanding circumstellar shells

Observations show that 1612-MHz masers of OH/IR stars can fade on a time-scale of a decade. This fading is probably associated with the switch from rapid mass loss, which is ultimately linked with an

Monitoring of OH maser emission from late-type stars

Eight OH--IR stars have been monitored at the satellite- and main-line frequencies of OH. We have addressed problems relating to the pump mechanisms responsible for the maser inversion, the degree of

OH-IR stars. II. A model for the 1612 MHz masers

A model is presented for the 1612 MHz OH masers associated with infrared stars. Its principal conclusions are as follows. The central stars are losing approx.3 x 10/sup -5/ M/sub sun/yr/sup -1/, and

Structure of stellar hydroxyl masers

This paper presents the results of two spectral-line very long baseline (VLB) interferometric experiments on stellar OH masers. These masers are usually associated with long-period variable stars,

The Effect of 53 μm IR Radiation on 18 cm OH Megamaser Emission

OH megamasers (OHMs) emit primarily in the main lines at 1667 and 1665 MHz and differ from their Galactic counterparts due to their immense luminosities, large line widths, and 1667/1665 MHz flux

Time variations in the OH microwave and infrared emission from late-type stars

Abstract : The OH microwave and infrared variability of 14 OH/IR stars were studied. Many of the sources show periodic flux variations between 1 and 10 micrometer and in the 1612-MHz OH lines with no

OH-IR stars. I. Physical properties of circumstellar envelopes

A theoretical model of the circumstellar envelope which surrounds a OH-IR star is developed. The circumstellar gas is ejected by radiation pressure which acts on dust grains that condense in the

CONSTRAINTS ON OH MEGAMASER EXCITATION FROM A SURVEY OF OH SATELLITE LINES

We report the results of a full-Stokes survey of all four 18 cm OH lines in 77 OH megamasers (OHMs) using the Arecibo Observatory. This is the first survey of OHMs that included observations of the

A Search for OH Megamasers at z > 0.1. III. The Complete Survey

We present the final results from the Arecibo ObservatoryThe Arecibo Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under a cooperative