283 citations · 797 across the 15 of their papers we have counts for
14 papers
The Big Bang Was Not That Bright
Yaron Sheffer
A recent arXiv manuscript, arXiv:1801.03278, claims that a cosmic background radiation with a black body temperature of ~ 500 K (440 F) was just barely visible to huma…
C in Photodissociation Regions
Pablo Castellanos, Olivier Berné, Yaron Sheffer +2
Recent studies have confirmed the presence of buckminsterfullerene (C) in different interstellar and circumstellar environments. However, several aspects regarding C…
Ultraviolet Measurements of Interstellar C2
Ryan C. Hupe, Y. Sheffer, S. R. Federman
We analyzed archival spectra acquired with the Hubble Space Telescope for a study of interstellar C2. Absorption from the electronic transitions, D ^1Sigma^+_u -- X ^1Sigma^+_g (0,…
PDR Model Mapping of Physical Conditions via Spitzer/IRS Spectroscopy of H2: Theoretical Success toward NGC 2023-South
Y. Sheffer, M. G. Wolfire, D. J. Hollenbach +2
We use the IRS on Spitzer to observe the southern part of the reflection nebula NGC 2023, including the Southern Ridge, which is a photodissociation region par excellence excited b…
The Abundance of Boron in Diffuse Interstellar Clouds
A. M. Ritchey, S. R. Federman, Y. Sheffer +1
We present a comprehensive survey of boron abundances in diffuse interstellar clouds from observations made with the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space…
The First Positive Detection of Molecular Gas in a GRB Host Galaxy
J. X. Prochaska, Y. Sheffer, D. A. Perley +9
We report on strong H2 and CO absorption from gas within the host galaxy of gamma-ray burst (GRB) 080607. Analysis of our Keck/LRIS afterglow spectrum reveals a very large HI colum…