Results 21 to 30 of about 3,566,597 (273)

The cold neutral phase of the interstellar medium in high redshift galaxies

Journal of Physics: Conference Series, 2019
Abstract We present the results of spectroscopic analysis of seven new H2-bearing damped Ly- systems in redshift range z=2.5 − 3. These systems were originally selected from SDSS catalog using a direct search for H2 and followed up with X-SHOOTER spectrograph at 8-m Very Large Telescope observatory. We measured the column densities of HI,
S A Balashev, V V Klimenko, P Noterdaeme, J K Krogager, C Ledoux, A V Ivanchik, D A Varshalovich, P Petitjean   +7 more
openaire   +1 more source

The Physics of the Cold Neutral Medium: Low-frequency Radio Recombination Lines with the Square Kilometre Array [PDF]

Proceedings of Advancing Astrophysics with the Square Kilometre Array — PoS(AASKA14), 2015
J. B. R. Oonk∗1,2, L. K. Morabito1, F. Salgado1, M. C. Toribio2, R. J. van Weeren3, A. G. G. M. Tielens1, and H. J. A. Rottgering1 1Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands 2Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, NL-7990 AA Dwingeloo, the Netherlands 3Harvard-Smithsonian Center for ...
Raymond Oonk, Leah Morabito, F. Salgado, M. C. Toribio, R. J. van Weeren, A. G. G. M. Tielens, H. J. A. Rottgering   +6 more
openaire   +1 more source

Turbulent power spectrum in warm and cold neutral medium using the Galactic H i21 cm emission [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
Small-scale fluctuations of different tracers of the interstellar the medium can be used to study the nature of turbulence in astrophysical scales. Of these, the `continuum' emission traces the fluctuations integrated along the line of sight whereas, the spectral line tracers give the information along different velocity channels as well.
Choudhuri, Samir, Roy, Nirupam
openaire   +3 more sources

Cold ion-neutral reactions [PDF]

, 2013
Cold ion-neutral reactive processes were studied in an hybrid trap down to average collision energies /k_B > 20 mK. The atomic ion-neutral systems Ca^+ + Rb and Ba^+ + Rb were studied, and the results interpreted with high-level quantum chemical and ...
Hall, Felix Henry Joynson
core   +1 more source

Ion and neutral beams merge to measure reactions under cold interstellar medium conditions

Scilight, 2022
Experiment becomes the first to employ the merged beams technique to study ion-neutral collisions at a heavy ion storage ring.
openaire   +1 more source

Properties of cold and warm H 

, 2018
Context. A large fraction of the interstellar medium can be characterized as a multiphase medium. The neutral hydrogen gas is bistable with cold and warm neutral medium (CNM and WNM respectively) but there is evidence for an additional phase at ...
P. M. W. Kalberla, U. Haud
core   +1 more source

Mechanisms for Lasing with Cold Atoms as the Gain Medium [PDF]

, 2008
International audienceWe realize a laser with a cloud of cold rubidium atoms as gain medium, placed in a low-finesse cavity. Three different regimes of laser emission are observed corresponding respectively to Mollow, Raman and Four Wave Mixing ...
Kaiser, Robin, Guerin, William, Michaud, Franck   +2 more
core   +1 more source

Constraining of physical conditions in the cold neutral medium using HD/H₂ relative abundance

Journal of Physics: Conference Series, 2020
Abstract We present constraints on physical conditions in diffuse HD/H2-bearing molecular clouds using measured HD/H2 column density ratio. We used recently published formalism that describes how this ratio changes with ultraviolet field intensity, number density and cosmic ray ionization rate. Out of them the most important parameter is
D N Kosenko, S A Balashev
openaire   +1 more source

The Role of Causal Processes in the Neutral and Nearly Neutral Theories [PDF]

, 2007
In this paper, we will consider how the neutral and nearly neutral theories of molecular evolution differ from each other as a means for addressing causal processes associated with random drift and natural selection.
Michael R. Dietrich, Millstein, Roberta L, Dietrich, Michael R, Millstein, Roberta L., Dietrich, Michael R., Dietrich, Michael, Roberta L. Millstein   +6 more
core   +1 more source

Reconstructing enzyme evolution by protein engineering

FEBS Letters, EarlyView.
Natural enzyme evolution can be retraced by protein engineering methods such as directed evolution, rational design, and ancestral sequence reconstruction. These approaches reveal how enzymes emerged from ligand‐binding scaffolds, developed varying substrate preferences, formed oligomeric complexes, adapted to environmental changes, and evolved novel ...
Lukas Drexler, Markus R. Busch, Reinhard Sterner   +2 more
wiley   +1 more source