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A spectroscopic search for leaking lyman continuum at zeta approximately 0.7
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gardner, Jonathan P. Colbert Sr., James DeMello, Duilia F. Bridge, Carrie R. Ferguson, Henry C. Teplitz, Harry I. Siana, Brian Rudie, Gwen C. Armus, Lee Brown, Thomas M. Dickinson, Mark Giavalisco, Mauro Scarlata, Claudia Salvato, Mara Conselice, Christopher J. |
| Copyright Year | 2010 |
| Description | We present the results of rest-frame, UV slitless spectroscopic observations of a sample of 32 z approx. 0.7 Lyman Break Galaxy (LBG) analogs in the COSMOS field. The spectroscopic search was performed with the Solar Blind Channel (SBC) on HST. While we find no direct detections of the Lyman Continuum we achieve individual limits (3sigma) of the observed non-ionizing UV to Lyman continuum flux density ratios, f(sub nu)(1500A)/f(sub nu)(830A) of 20 to 204 (median of 73.5) and 378.7 for the stack. Assuming an intrinsic Lyman Break of 3.4 and an optical depth of Lyman continuum photons along the line of sight to the galaxy of 85% we report an upper limit for the relative escape fraction in individual galaxies of 0.02 - 0.19 and a stacked 3sigma upper limit of 0.01. We find no indication of a relative escape fraction near unity as seen in some LBGs at z approx. 3. Our UV spectra achieve the deepest limits to date at any redshift on the escape fraction in individual sources. The contrast between these z approx. 0.7 low escape fraction LBG analogs with z approx. 3 LBGs suggests that either the processes conducive to high f(sub esc) are not being selected for in the z less than or approx.1 samples or the average escape fraction is decreasing from z approx. 3 to z approx. 1. We discuss possible mechanisms which could affect the escape of Lyman continuum photons |
| File Size | 1476764 |
| Page Count | 16 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20100015395 |
| Archival Resource Key | ark:/13960/t9673fc1g |
| Language | English |
| Publisher Date | 2010-02-12 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Spectroscopy Red Shift Galaxies Flux Density Ultraviolet Spectra Continuums Photons Optical Thickness Line of Sight Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
