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The Effect of Bi-conical Outflows on Ly$alpha$ Escape From Green Peas | | Cody Carr
; Claudia Scarlata
; Alaina Henry
; Nino Panagia
; | | Date: |
4 Nov 2020 | | Abstract: | We analyze the spectra of $10$ Green Pea galaxies, previously studied by
Henry et al. (2015), using a semi-analytical line transfer (SALT) model to
interpret emission and absorption features observed in UV galactic spectra. We
focus our analysis on various ionization states of silicon, associated with the
cool ($sim 10^4$ K) and warm ($sim 10^5$ K) gas. By analyzing low-ionization
lines, we study the relationships between the distribution and kinematics of
the outflowing H I gas and the observed Ly$alpha$ escape fraction,
$f_{esc}^{Lyalpha}$, as well as the Ly$alpha$ emission peak separation,
$Delta_{peak}$. We find that outflow geometries which leave a portion of the
source uncovered along the line of sight create the best conditions for
Ly$alpha$ escape and have narrow peak separations, while geometries which
block the observer’s view of the source create the worst conditions for
Ly$alpha$ escape and have large peak separations. To isolate the effects of
outflow kinematics, we restricted our testing set to galaxies with spherical
outflows and found that $f_{esc}^{Lyalpha}$ and the Ly$alpha$ luminosity both
increase with the extent of the galactic winds. A simple estimate suggests that
the collisional excitation of neutral hydrogen by free electrons in the cool
gas of the winds can account for the Ly$alpha$ luminosity observed in these
objects. Finally, we speculate on the relationship between outflows and the
escape of ionizing radiation from the CGM. | | Source: | arXiv, 2011.02549 | | Services: | Forum | Review | PDF | Favorites | |
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