Changed PDF, anonymized
2053426474
Assigned ID: 5523
----- Attempting Submission 1 (Tue Mar 26 17:57:55 GMT 2024) -----
HST Phase I Proposal 5523 successfully submitted.
Receipt: # 5523-1
----- Attempting Submission 2 (Tue Mar 26 17:59:33 GMT 2024) -----
HST Phase I Proposal 5523 successfully submitted.
Receipt: # 5523-2
----- Attempting Submission 3 (Tue Mar 26 18:01:08 GMT 2024) -----
HST Phase I Proposal 5523 successfully submitted.
Receipt: # 5523-3
----- Attempting Submission 4 (Wed Mar 27 00:22:24 GMT 2024) -----
Second submission based on suggestions from Roberto (CS).
1905068337
----- Attempting Submission 1 (Mon Jul 29 15:06:55 GMT 2024) -----
----- Attempting Submission 2 (Tue Sep 17 08:15:43 GMT 2024) -----
Exploring the unexpected interplay between Lyman-alpha and C IV emission using spatially resolved imaging
The synergy between Lyman-alpha and C IV 1548,50A is among our most promising UV diagnostics for understanding the escape of ionizing photons across all energy levels. Lya probes the properties of low-ionization gas (~13.6 eV), while C IV probes higher-energy levels (>54 eV), corresponding to photons capable of ionizing two hydrogen atoms each. Notably, both HST and JWST observations have uncovered targets with significant C IV emissions in galaxies at redshifts around 5--11. Thus, to disentangle the role of star-forming galaxies in the overall ionizing budget across various energy levels, our models must reproduce both the Lya and C IV emissions.
Recent low-z observations of C IV and Lya emitters have revealed intriguing trends: galaxies with substantial C IV emission tend to exhibit larger damped Lyman-alpha absorption, whereas those with prominent Lya emission often display weak or no C IV absorption. This contrasting behavior challenges our current understanding of the interplay between hard ionizing fields and the escape of ionizing photons. It suggests that galaxies with hard ionizing sources may not significantly contribute to reionization due to being embedded in large opaque H I clouds.
Here, we propose 25 orbits of HST ACS/SBC observations to spatially resolve the Lya, C IV, and UV emission in a sample of 8 star-forming galaxies at a redshift ~ 0. Four galaxies exhibit strong C IV emission and damped Lya absorption and four have weak C IV emission and dominant Lya emission. The requested observations are essential for improving our understanding of the Lya and C IV synergy and determining the contribution of C IV emitting galaxies to reionization.
The goal of this proposal is to map to map and compare the morphology of the Lyalpha, C iv, and UV
continuum with a spatial resolution down to 10 pc in a sample of eight local star-forming galaxies (including 3 archival) with weak and strong Lyalpha and C iv emission using HST ACS/SBC.
We request ACS/SBC F125LP, F140LP, F150LP and F165LP to cover Ly alpha, FUV continuum, the CIV 1548,51 and also the HeII1640+[OIII]1661, emission lines.
We expect that the targeted emission will be well captured in one pointing of the ACS/SBC (34.6"x30") with sufficient space for background subtraction.
ETCs: To estimate exposure times, we took advantage of each target's archival COS spectrum, from which we measured the stellar continuum and emission line surface brightnesses in the COS aperture (2.5"x2.5"). We used these values as input for the ACS Exposure Time Calculators (ETC). We assumed that the targeted line emission is coming from an extended region with an aperture of 2.5".
ACS/SBC observations:
We request SHADOW for the F125LP filter to mitigate the bright geocoronal Ly-alpha emission and geocoronal line OI1302. We used the ACS-SBC-DITHER-BOX pattern for all exposures.
All the members of our team are experts in studies of starburst galaxies, and in particular its interstellar medium and nebular properties (Berg, Scarlata, Hayes, Verhamme, Leclercq, Blaizot, Mauerhofer, Mingozzi). Jurlin is expert in high-energy radiation within AGN and star-forming galaxies. Blaizot, Verhamme, Gazagnes, Mauerhofer, Scarlata are expert on radiative transfer simulations and applied to RHD simulations. Scarlata has developed the SALT code which will be used. Hayes, Verhamme, Blaizot, Leclercq and Gazagnes are expert in Lya studies, Berg and Mingozzi in C IV emission and nebular models. Importantly, Hayes and Mingozzi are expert of HST ACS/SBC imaging and analysis.
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:date "17-Sep-2024 03:13:01.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
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:saa-model "28"
:si-bright-earth-limb-angle 20.0
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:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 17702
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:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 17702
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)
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)
false
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