Zobrazeno 1 - 10
of 130
pro vyhledávání: '"Sheffer, Y."'
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 (0,0) as well as F ^1Pi_u -- X ^1Sigma^+_g (0,0) and (1,0), was the focus
Externí odkaz:
http://arxiv.org/abs/1211.0844
Publikováno v:
ApJ 741, 45 (2011)
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 by HD 37903. Five pure-rotational H2 emission lines are detected and ma
Externí odkaz:
http://arxiv.org/abs/1110.4614
We reanalyzed interstellar Cl I and Cl II spectra acquired with the Copernicus satellite. The directions for this study come from those of Crenny & Federman and sample the transition from atomic to molecular rich clouds where the unique chemistry lea
Externí odkaz:
http://arxiv.org/abs/1110.0350
Publikováno v:
Astrophys. J., 728:70 (37pp), 2011
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 Telescope. Our sample of 56 Galactic sight lines is the result of a c
Externí odkaz:
http://arxiv.org/abs/1012.4457
Publikováno v:
IAU Symp.268:237,2010
We present a comprehensive survey of B abundances in diffuse interstellar clouds from HST/STIS observations along 56 Galactic sight lines. Our sample is the result of a complete search of archival STIS data for the B II resonance line at 1362 angstro
Externí odkaz:
http://arxiv.org/abs/0912.3579
Publikováno v:
Astrophys.J.701:L63-L67,2009
GRB 080607 has provided the first strong observational signatures of molecular absorption bands toward any galaxy hosting a gamma-ray burst. Despite the identification of dozens of features as belonging to various atomic and molecular (H_2 and CO) ca
Externí odkaz:
http://arxiv.org/abs/0907.1285
Autor:
Boisse, P., Rollinde, E., Hily-Blant, P., Pety, J., Federman, S. R., Sheffer, Y., Forets, G. Pineau des, Roueff, E., Andersson, B-G, Hebrard, G.
The runaway star HD34078, initially selected to investigate small scale structure in a foreground diffuse cloud has been shown to be surrounded by highly excited H2. We first search for an association between the foreground cloud and HD34078. Second,
Externí odkaz:
http://arxiv.org/abs/0902.0541
Autor:
Prochaska, J. X., Sheffer, Y., Perley, D. A., Bloom, J. S., Lopez, L. A., Dessauges-Zavadsky, M., Chen, H. -W., Filippenko, A. V., Ganeshalingam, M., Li, W., Miller, A. A., Starr, D.
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 column density (NHI = 10^22.70 cm^-2) and strong metal-line absorption at z
Externí odkaz:
http://arxiv.org/abs/0901.0556
(Abridged) We carried out a comprehensive far-ultraviolet (UV) survey of ^12CO and H_2 column densities along diffuse molecular Galactic sight lines in order to explore in detail the relationship between CO and H_2. We measured new CO abundances from
Externí odkaz:
http://arxiv.org/abs/0807.0940
Publikováno v:
Astrophys.J. 667 (2007) 1002-1016
We examine 20 diffuse and translucent Galactic sight lines and extract the column densities of the ^12CO and ^13CO isotopologues from their ultraviolet A--X absorption bands detected in archival Space Telescope Imaging Spectrograph data with lambda/D
Externí odkaz:
http://arxiv.org/abs/0706.3855