Spectroscopy of Bright Quasars with the Hubble Space Telescope and Lyman-Alpha Absorption Lines in the Redshift Range 0.5 < Z < 1.7

1996 ◽  
Vol 463 ◽  
pp. 473 ◽  
Author(s):  
C. D. Impey ◽  
C. E. Petry ◽  
M. A. Malkan ◽  
W. Webb
Keyword(s):  
Hubble Space Telescope ◽  
Absorption Lines ◽  
Redshift Range ◽  
Space Telescope ◽  
Lyman Alpha

scholarly journals Outside the Lyman-break box: detecting Lyman continuum emitters at 3.5 < z < 5.1 with CLAUDS

2020 ◽  
Vol 494 (4) ◽  
pp. 4986-5007 ◽  
Author(s):  
U Meštrić ◽  
E V Ryan-Weber ◽  
J Cooke ◽  
R Bassett ◽  
M Sawicki ◽  
...  
Keyword(s):  
Intergalactic Medium ◽  
Hubble Space Telescope ◽  
High Redshift ◽  
Large Area ◽  
Redshift Range ◽  
Space Telescope ◽  
High Redshift Galaxies ◽  
Lyman Continuum ◽  
Deep Survey ◽  
Individual Galaxies

ABSTRACT Identifying non-contaminated sample of high-redshift galaxies with escaping Lyman continuum (LyC) flux is important for understanding the sources and evolution of cosmic reionization. We present CLAUDS (CFHT Large Area u-band deep survey) u-band photometry of the COSMOS field to probe LyC radiation from spectroscopically confirmed galaxies at $z$ ≥ 3.5 and outside the standard Lyman-break galaxy colour-selection expectations. Complementary to the CLAUDS data, we use Subaru multifilter photometry, Hubble Space Telescope (HST) multifilter imaging, and the spectroscopic surveys D10K, VUDS, and 3D-HST. We present a sample of Lyman continuum galaxy (LCG) candidates in the redshift range 3.5 ≲ $z$ ≲ 5.1. Here, we introduce 5 LCG candidates, where two are flagged quality 1 and three quality 2. The estimated $f_{\rm esc}^{\rm abs}$ for quality 1 candidates are in the range $\sim 5 - 73{{\ \rm per\ cent}}$ and $\sim 30 - 93{{\ \rm per\ cent}}$. These estimates are based on our derived parameters from individual galaxies as inputs to a range of BPASS models as well as mean intergalactic medium (IGM) and maximal intergalactic and circumgalactic media (IGM+CGM) transmission. We conclude that our search for LCGs is most likely biased to lines of sight with low H i densities or free from Lyman limit systems. Our two best LCG candidates have EW (Lyα) ≤ 50 Å and we find no correlation or anticorrelation between EW (Lyα), $f_{\rm esc}^{\rm abs}$, and Robs, the ratio of ionizing to non-ionizing observed flux in the measured passbands. Stacking candidates without solid LyC detections (S/N &lt; 3) results in an estimated $f_{\rm esc}^{\rm abs}$ from galaxies not greater than $1{{\ \rm per\ cent}}$.

3D Monte-Carlo Model of Europa's Water Plumes

2021 ◽  
Author(s):  
Audrey Vorburger ◽  
Peter Wurz
Keyword(s):  
Monte Carlo ◽  
Hubble Space Telescope ◽  
Monte Carlo Model ◽  
Line Emission ◽  
True Nature ◽  
Near Surface ◽  
Space Telescope ◽  
Lyman Alpha ◽  
Surface Ocean ◽  
3D Monte Carlo

&lt;p&gt;With the pending launches of JUICE and Europa Clipper within the next three years, interest in Europa plumes and the implications they might hold has regained momentum.&lt;/p&gt;&lt;p&gt;In 2014, Roth et al. presented first evidence for Europa plume activity based on Hubble Space Telescope (HST) Space Telescope Imaging Spectograph (STIS) Lyman-alpha and OI 1304 &amp;#197; line emission observations. The observed line emissions imply two underlying plumic sources, located ~20&amp;#176; apart, exhibiting radial expansions of ~200 km and latitudinal expansions of ~20&amp;#176;, and containing ~2,000 kg of H2O (~1.5 &amp;#8729; 10&lt;sup&gt;16&lt;/sup&gt; H&lt;sub&gt;2&lt;/sub&gt;O/cm&lt;sup&gt;2&lt;/sup&gt;). Since then, several more Europa plume observation attempts were undertaken, though only a hand full proved successful.&amp;#160;&lt;/p&gt;&lt;p&gt;Most importantly, the true nature of the observed plume signature still remains to be determined. Plumes can either originate from the topmost surface layer, from within the ice layer, or from the sub-surface ocean. Depending on the location of origin, the plumes contain information about vastly different zones: If they are surficial, they will contain information about the highly irradiated and highly processed surface, if they originate from the sub-surface ocean, they might hold information on Europa&amp;#8217;s potentially life-bearing region.&lt;/p&gt;&lt;p&gt;In this presentation, we present 3D Monte-Carlo model results of three different plume scenarios, two of which originate in Europa&amp;#8217;s surface ice layer (near-surface liquid inclusion and diapir) whereas the third originates in the sub-surface ocean (oceanic plume). In this model we trace not only the H&lt;sub&gt;2&lt;/sub&gt;O molecules, but also its dissociation products, i.e., OH, H and O. To compare the plume structures obtained from the Monte-Carlo model to the HST-STIS observations, we include all known relevant Lyman-alpha and OI 1304 &amp;#197; emission excitation mechanisms in our model. Such a comparison does not only shed more light on the plumes that have already been observed, but will also help targeting plume measurements in the near future, as well as interpreting in situ measurements once such become available.&lt;/p&gt;

The Hubble Space Telescope quasar absorption line key project. I - First observational results, including Lyman-alpha and Lyman-limit systems

1993 ◽  
Vol 87 ◽  
pp. 1 ◽  
Author(s):  
John N. Bahcall ◽  
Jacqueline Bergeron ◽  
Alec Boksenberg ◽  
George F. Hartig ◽  
Buell T. Jannuzi ◽  
...  
Keyword(s):  
Absorption Line ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Lyman Alpha

The Hubble Space Telescope Quasar Absorption Line Key Project. XV. Milky Way Absorption Lines

2000 ◽  
Vol 129 (2) ◽  
pp. 563-610 ◽  
Author(s):  
Blair D. Savage ◽  
Bart Wakker ◽  
Buell T. Jannuzi ◽  
John N. Bahcall ◽  
Jacqueline Bergeron ◽  
...  
Keyword(s):  
Absorption Line ◽  
Milky Way ◽  
Hubble Space Telescope ◽  
Absorption Lines ◽  
Space Telescope

scholarly journals A catalogue of absorption lines in eight Hubble Space Telescope/STIS E230M 1.0 < z < 1.7 quasar spectra★

2007 ◽  
Vol 382 (3) ◽  
pp. 1094-1104 ◽  
Author(s):  
N. Milutinović ◽  
T. Misawa ◽  
R. S. Lynch ◽  
J. R. Masiero ◽  
C. Palma ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Absorption Lines ◽  
Space Telescope ◽  
Quasar Spectra

scholarly journals Deep Hubble Space Telescope Imaging on the Extended Lyα Emission of a QSO at z = 2.19 with a Damped Lyman Alpha System as a Natural Coronagraph

2020 ◽  
Vol 889 (1) ◽  
pp. L12
Author(s):  
Jiani Ding ◽  
Zheng Cai ◽  
J. Xavier Prochaska ◽  
H. Finley ◽  
Xiaohui Fan ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Space Telescope ◽  
Lyman Alpha
Sign in / Sign up

Export Citation Format

Share Document