1,743 research outputs found
Atomic carbon at redshift ~2.5
Using the IRAM 30m telescope we detected the lower fine structure line of
neutral carbon towards three high--redshift sources: IRAS FSC10214 (z=2.3),
SMMJ14011+0252 (z=2.5) and H1413+117 (Cloverleaf quasar, z=2.5). SMMJ14011+0252
is the first high--redshift, non--AGN source in which CI has been detected. The
CI(1-0) line from FSC10214 is almost an order of magnitude weaker than
previously claimed, while our detection in the Cloverleaf is in good agreement
with earlier observations. The CI(1-0) linewidths are similar to the CO widths,
indicating that both lines trace similar regions of molecular gas on galactic
scales. Derived CI masses for all three objects are of order few 10^7 solar
masses and the implied CI(1-0)/CO(3-2) line luminosity ratio is about 0.2. This
number is similar to values found in local galaxies. We derive a CI abundance
of 5x10^{-5} which implies significant metal enrichment of the cold molecular
gas at redshifts 2.5 (age of the universe 2.7 Gyr). We conclude that the
physical properties of systems at large lookback times are similar to today's
starburst/AGN environments.Comment: 4 pages, 2 figures; accepted by A&
The Spectral Energy Distribution of CO lines in M82
We present an analysis of the excitation conditions of the molecular gas in
the streamers and the outflow of M82 based on observations obtained at the IRAM
30m telescope. Our analysis of J=1-0 and J=2-1 transitions of CO and 13CO and
the CO(3-2) line in 13 regions outside the central starburst disk shows that
the gas density within the streamer/outflow system is about an orderof
magnitude lower (n(H2) ~ 10^3 cm^-3) than in the central molecular disk. We
have used an LVG model and data from the literature to constrain the flux
density in each CO transition (the `CO line SED') arising from the
streamer/outflow system and the central starburst disk itself. Globally, we
find that the CO flux density up to the J=3-2 line is dominated by the diffuse
outer regions while lines above the J=5-4 transition are almost exclusively
emitted by the central starburst disk. We compare the CO line SED of M82 to CO
observations of galaxies at high redshift and suggest that small high-J/low-J
CO flux density ratios (observed in some of these sources) are not necessarily
caused by a different excitation of the central molecular gas concentration,
but may result from an additional, more extended and diffuse gas reservoir
around these systems, reminiscent of the situation in M82.Comment: 12 pages, 7 figures, accepted by A&
Correlating the nanostructure of Al-oxide with deposition conditions and dielectric contributions of two-level systems in perspective of superconducting quantum circuits
This work is concerned with Al/Al-oxide(AlO)/Al-layer systems which are
important for Josephson-junction-based superconducting devices such as quantum
bits. The device performance is limited by noise, which has been to a large
degree assigned to the presence and properties of two-level tunneling systems
in the amorphous AlO tunnel barrier. The study is focused on the
correlation of the fabrication conditions, nanostructural and nanochemical
properties and the occurrence of two-level tunneling systems with particular
emphasis on the AlO-layer. Electron-beam evaporation with two different
processes and sputter deposition were used for structure fabrication, and the
effect of illumination by ultraviolet light during Al-oxide formation is
elucidated. Characterization was performed by analytical transmission electron
microscopy and low-temperature dielectric measurements. We show that the
fabrication conditions have a strong impact on the nanostructural and
nanochemical properties of the layer systems and the properties of two-level
tunneling systems. Based on the understanding of the observed structural
characteristics, routes are derived towards the fabrication of
Al/AlO/Al-layers systems with improved properties.Comment: 28 pages, 4 figure
Weak 13CO in the Cloverleaf Quasar: evidence for a young, early generation starburst
Observations of 12CO at high redshift indicate rapid metal enrichment in the
nuclear regions of at least some galaxies in the early universe. However, the
enrichment may be limited to nuclei that are synthesized by short-lived massive
stars, excluding classical secondary nuclei like 13CO. Testing this idea, we
tentatively detect the 13CO J=3-2 line at a level of 0.3 Jy km/s toward the
Cloverleaf Quasar at redshift 2.5. This is the first observational evidence for
13CO at high redshift. The 12CO/13CO J=3-2 luminosity ratio is with at least 40
much higher than ratios observed in molecular clouds of the Milky Way and in
the ultraluminous galaxy Arp 220, but may be similar to that observed toward
NGC 6240. Large Velocity Gradient (LVG) models simulating seven 12CO
transitions and the 13CO line yield 12CO/13CO abundance ratios in excess of 100
for the Cloverleaf. It is possible that the measured ratio is affected by a
strong submillimeter radiation field, which reduces the contrast between the
13CO line and the background. It is more likely, however, that the ratio is
caused by a real deficiency of 13CO. A potential conflict with optical data,
indicating high abundances also for secondary nuclei in quasars of high
redshift, may be settled if the bulk of the CO emission is originating
sufficiently far from the active galactic nucleus.Comment: 7 pages, 5 figures, accepted for publication in A&A (Main Journal
Excitation of the molecular gas in the nuclear region of M82
We present high resolution HIFI spectroscopy of the nucleus of the
archetypical starburst galaxy M82. Six 12CO lines, 2 13CO lines and 4
fine-structure lines are detected. Besides showing the effects of the overall
velocity structure of the nuclear region, the line profiles also indicate the
presence of multiple components with different optical depths, temperatures and
densities in the observing beam. The data have been interpreted using a grid of
PDR models. It is found that the majority of the molecular gas is in low
density (n=10^3.5 cm^-3) clouds, with column densities of N_H=10^21.5 cm^-2 and
a relatively low UV radiation field (GO = 10^2). The remaining gas is
predominantly found in clouds with higher densities (n=10^5 cm^-3) and
radiation fields (GO = 10^2.75), but somewhat lower column densities
(N_H=10^21.2 cm^-2). The highest J CO lines are dominated by a small (1%
relative surface filling) component, with an even higher density (n=10^6 cm^-3)
and UV field (GO = 10^3.25). These results show the strength of multi-component
modeling for the interpretation of the integrated properties of galaxies.Comment: Accepted for publication in A&A Letter
Resolving the molecular gas around the lensed quasar RXJ0911.4+0551
We report on high angular resolution observations of the CO(7-6) line and
millimeter continuum in the host galaxy of the gravitationally lensed (z~2.8)
quasar RXJ0911.4+0551 using the Plateau de Bure Interferometer. Our CO
observations resolve the molecular disk of the source. Using a lens model based
on HST observations we fit source models to the observed visibilities. We
estimate a molecular disk radius of 10.2 kpc and an inclination of
696\deg, the continuum is more compact and is only marginally resolved by
our observations. The relatively low molecular gas mass, Msolar, and far infrared luminosity, Lsolar, of this quasar could be explained by its relatively low
dynamical mass, Msolar. It would be a
scaled-down version the QSOs usually found at high-z. The FIR and CO
luminosities lie on the correlation found for QSOs from low to high redshifts
and the gas-to-dust ratio () is similar to the one measured in the
z=6.4 QSO, SDSS J1148+5251. Differential magnification affects the
continuum-to-line luminosity ratio, the line profile and possibly the spectral
energy distribution.Comment: Accepted for publication in A&A, revised after language editin
History of Intellectual Culture : International Yearbook of Knowledge and Society
With concepts of participation discussed in multiple disciplines from media studies to anthropology, from political sciences to sociology, the first issue of the new yearbook History of Intellectual Culture (HIC) dedicates a thematic section to the way knowledge can and arguably must be conceptualized as "participatory".Introducing and exploring "participatory knowledge", the volume aims to draw attention to the potential of looking at knowledge formation and circulation through a new lens and to open a dialogue about how and what concepts and theories of participation can contribute to the history of knowledge. By asking who gets to participate in defining what counts as knowledge and in deciding whose knowledge is circulated, modes of participation enter into the examination of knowledge on various levels and within multiple cultural contexts.The articles in this volume attest to the great variety of approaches, contexts, and interpretations of "participatory knowledge", from the sociological projects of the Frankfurt School to the Uppsala-based Institute for Race Biology, from the Argentinian National Folklore Survey to current hashtag activism and Covid-19-archive projects. HIC sees knowledge as rooted in social and political structures, determined by modes of transfer and produced in collaborative processes. The notion of "participatory knowledge" highlights in a compelling way how knowledge is rooted in cultural practices and social configurations
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