A simple model of atomic collision in the presence of an intense radiation field: A comparison test for gauge invariant vs. conventional quantum transition probabilities

1988 ◽  
Vol 8 (1) ◽  
pp. 63-69 ◽  
Author(s):  
N. Durante ◽  
G. P. Arrighini ◽  
C. Guidotti
Keyword(s):  
Simple Model ◽  
Radiation Field ◽  
Transition Probabilities ◽  
Quantum Transition ◽  
Atomic Collision ◽  
Gauge Invariant ◽  
Comparison Test ◽  
Intense Radiation

scholarly journals MMT/MMIRS spectroscopy of z = 1.3 - 2.4 extreme [O iii] emitters: implications for galaxies in the reionization era

2019 ◽  
Vol 489 (2) ◽  
pp. 2572-2594 ◽  
Author(s):  
Mengtao Tang ◽  
Daniel P Stark ◽  
Jacopo Chevallard ◽  
Stéphane Charlot
Keyword(s):  
Star Formation ◽  
Radiation Field ◽  
Production Efficiency ◽  
Rest Frame ◽  
Optical Emission ◽  
Intense Line ◽  
Massive Galaxies ◽  
Stellar Masses ◽  
The Impact ◽  
Intense Radiation

ABSTRACT Galaxies in the reionization era have been shown to have prominent [O iii] + H β emission. Little is known about the gas conditions and radiation field of this population, making it challenging to interpret the spectra emerging at z ≳ 6. Motivated by this shortcoming, we have initiated a large MMT spectroscopic survey identifying rest-frame optical emission lines in 227 intense [O iii] emitting galaxies at 1.3 < z < 2.4. This sample complements the MOSDEF and KBSS surveys, extending to much lower stellar masses ($10^7\!-\!10^8 \, \mathrm{M}_\odot$) and larger specific star formation rates (5–300 Gyr−1), providing a window on galaxies directly following a burst or recent upturn in star formation. The hydrogen ionizing production efficiency (ξion) is found to increase with the [O iii] equivalent width (EW), in a manner similar to that found in local galaxies. We describe how this relationship helps explain the anomalous success rate in identifying Ly α emission in z ≳ 7 galaxies with strong [O iii] + H β emission. We probe the impact of the intense radiation field on the ISM using O32 and Ne3O2, two ionization-sensitive indices. Both are found to scale with the [O iii] EW, revealing extreme ionization conditions not commonly seen in older and more massive galaxies. In the most intense line emitters, the indices have very large average values (O32 = 9.1, Ne3O2 = 0.5) that have been shown to be linked to ionizing photon escape. We discuss implications for the nature of galaxies most likely to have O32 values associated with significant LyC escape. Finally we consider the optimal strategy for JWST spectroscopic investigations of galaxies at z ≳ 10 where the strongest rest-frame optical lines are no longer visible with NIRSpec.

scholarly journals 9.17. Accretion disk winds driven by the disk radiation field under radiation drag

1998 ◽  
Vol 184 ◽  
pp. 415-416
Author(s):  
Y. Tajima ◽  
J. Fukue
Keyword(s):  
Radiation Field ◽  
Accretion Disk ◽  
Ionized Gas ◽  
Radiation Fields ◽  
Intense Radiation

The radiative winds from a geometrically thin accretion disk are studied. The effect of radiation drag which causes in the intense radiation fields around the accretion disk is examined recently. Then, we numerically consider the radiatively-accelerated accretion-disk winds which consist of ionized gas particles, taking into account radiation drag of the order ofv/c.

Spectroscopic diagnosis of long‐scale‐length exploding‐foil plasma in the presence of an intense radiation field

1992 ◽  
Vol 63 (10) ◽  
pp. 5101-5103 ◽  
Author(s):  
T. D. Shepard ◽  
C. J. Keane ◽  
L. J. Suter ◽  
J. Abdallah
Keyword(s):  
Radiation Field ◽  
Intense Radiation ◽  
Scale Length
Sign in / Sign up

Export Citation Format

Share Document