Zobrazeno 1 - 10
of 390
pro vyhledávání: '"L A, Sargent"'
Publikováno v:
Crustaceana. 86:387-402
Non-indigenous crayfish pose substantial threats to native species, community structure, and ecosystem function in invaded lakes across the globe. The well-documented range expansion of the rusty crayfish Orconectes rusticus is an ideal system to stu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::17411c1b5efd3604515be04efeb17637
https://doi.org/10.1163/15685403-00003187
https://doi.org/10.1163/15685403-00003187
Autor:
Wallace L. W. Sargent, J. Stuart B. Wyithe, Martin G. Haehnelt, Sudhir Raskutti, James S. Bolton, George D. Becker
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 419:2880-2892
We present measurements of the intergalactic medium (IGM) temperature within ~5 proper Mpc of seven luminous quasars at z~6. The constraints are obtained from the Doppler widths of Lyman-alpha absorption lines in the quasar near-zones and build upon
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::53e811cefa5357064ed0ecdff16939f5
https://doi.org/10.1111/j.1365-2966.2011.19929.x
https://doi.org/10.1111/j.1365-2966.2011.19929.x
Autor:
Swara Ravindranath, Wallace L. W. Sargent, Michael Rauch, George D. Becker, Jean-Rene Gauthier, Martin G. Haehnelt
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 418:1115-1126
We present observations of a peculiar Lyman alpha-emitting galaxy at redshift 3.344, discovered in a deep, blind spectroscopic survey for faint Lyman alpha emitters with the Magellan II telescope in the Hubble Ultra Deep Field (HUDF). The galaxy exhi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2edb46449e5c14c2564e66861058f53e
https://doi.org/10.1111/j.1365-2966.2011.19556.x
https://doi.org/10.1111/j.1365-2966.2011.19556.x
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 410:1096-1112
We present new measurements of the temperature of the intergalactic medium (IGM) derived from the Lyman-alpha forest over 2.0 ~12000 K at z ~ 2.8. This increase is not consistent with the monotonic decline in T0 expected in the absence of He II reion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0a9a14dbd7bb05ea451e7665c8c0f6b7
https://doi.org/10.1111/j.1365-2966.2010.17507.x
https://doi.org/10.1111/j.1365-2966.2010.17507.x
Autor:
J. Stuart B. Wyithe, George D. Becker, Martin G. Haehnelt, James S. Bolton, Wallace L. W. Sargent
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 406:612-625
The thermal state of the intergalactic medium (IGM) provides an indirect probe of both the HI and HeII reionisation epochs. Current constraints on the IGM temperature from the Lya forest are restricted to the redshift range 2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::19fd7db43b3490c82481c1cc8a953169
https://doi.org/10.1111/j.1365-2966.2010.16701.x
https://doi.org/10.1111/j.1365-2966.2010.16701.x
Publikováno v:
The Astrophysical Journal. 698:1010-1019
We present the results from our search for C IV in the intergalactic medium at redshifts z=5.3-6.0. We have observed four z~6 QSOs with Keck/NIRSPEC in echelle mode. The data are the most sensitive yet taken to search for C IV at these redshifts, bei
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::82642e8282d7d1e84eb66cf2a1bf4311
https://doi.org/10.1088/0004-637x/698/2/1010
https://doi.org/10.1088/0004-637x/698/2/1010
Autor:
Joseph C. Shields, Jonelle L. Walsh, Hans-Walter Rix, Wallace L. W. Sargent, Aaron J. Barth, Marc Sarzi, Alexei V. Filippenko, Luis C. Ho
Publikováno v:
The Astronomical Journal. 136:1677-1702
(Abridged) We present STIS observations of 14 nearby low-luminosity active galactic nuclei, including 13 LINERs and 1 Seyfert, taken at multiple parallel slit positions centered on the galaxy nuclei and covering the H-alpha spectral region. For each
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a53f334b358c9d816c6dea8ba3e03d7
https://doi.org/10.1088/0004-6256/136/4/1677
https://doi.org/10.1088/0004-6256/136/4/1677
Publikováno v:
Annals of the New York Academy of Sciences. 688
In a very provocative series of papers, Terlevich et al. (1992, and references therein) argue that the properties of active galactic nuclei (AGNs) can be explained by vigorous bursts of star formation in the high-metallicity nuclei of galaxies, espec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b264db90ed7f1d33076104997849ba61
https://pubmed.ncbi.nlm.nih.gov/26469484
https://pubmed.ncbi.nlm.nih.gov/26469484
Publikováno v:
The Astrophysical Journal. 640:69-80
We present a search for O I in the spectra of nine 4.9 10^13.7 cm^{-2} in the redshift intervals where O I 1302 falls redward of the Ly-alpha forest. Four of these lie towards SDSS J1148+5251 (z_qso = 6.42). This imbalance is unlikely to arise from v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2f0dd2eeefd6c071d442e46aeebe0c42
https://doi.org/10.1086/500079
https://doi.org/10.1086/500079
Publikováno v:
The Astrophysical Journal. 638:27-44
The analysis of the Lyman-alpha forest of absorption lines in quasar spectra has emerged as a potentially powerful technique to constrain the linear matter power spectrum. In most previous work, the amplitude of the ionizing background was fixed by c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a55e7060bfca21b768e8b8ac83ac84f2
https://doi.org/10.1086/498699
https://doi.org/10.1086/498699