78 research outputs found
Molecular Clouds in the Galactic Plane from = [59.75, 74.75] and = [5.25, +5.25]
In this paper we present the distribution of molecular gas in the Milky Way
Galactic plane from = [59.75, 74.75] and = [5.25,
+5.25], using the MWISP CO/CO/
emission line data. The molecular gas in this region can be mainly attributed
to the Local spur, Local arm, Perseus arm, and Outer arm. Statistics of the
physical properties of the molecular gas in each arm, such as excitation
temperature, optical depth, and column density, are presented. Using the DBSCAN
algorithm, we identified 15 extremely distant molecular clouds with kinematic
distances of 14.7217.77 kpc and masses of 363520 M, which we
find could be part of the Outer Scutum-Centaurus (OSC) arm identified by
\cite{2011ApJ...734L..24D} and \cite{2015ApJ...798L..27S}. It is also possible
that, 12 of these 15 extremely distant molecular clouds constitute an
independent structure between the Outer and the OSC arms or a spur. There exist
two Gaussian components in the vertical distribution of the molecular gas in
the Perseus spiral arm. These two Gaussian components correspond to two giant
filaments parallel to the Galactic plane. We find an upward warping of the
molecular gas in the Outer spiral arm with a displacement of around 270 pc with
respect to the Galactic mid-plane.Comment: 33 pages, 19 figure
The molecular clouds in a section of the third Galactic quadrant: observational properties and chemical abundance ratio between CO and its isotopologues
We compare the observational properties between CO, CO, and
CO and summarize the observational parameters based on 7069 clouds
sample from the Milky Way Imaging Scroll Painting (MWISP) CO survey in a
section of the third Galactic quadrant. We find that the CO angular area
() generally increases with that of CO (), and the ratio of to is 0.38 by
linear fitting. We find that the CO and CO flux are tightly
correlated as with both fluxes
calculated within the CO-bright region. This indicates that the
abundance is a constant to be 6.5 for all samples under assumption of local thermodynamic equilibrium
(LTE). Additionally, we observed that the X-factor is approximately constant in
large sample molecular clouds. Similarly, we find with both fluxes calculated within
CO-bright region, which indicates that the abundance ratios stays the same value 9.7 across the
molecular clouds under LTE assumption. The linear relationships of vs. and vs.
hold not only for the CO-bright region or CO-bright region, but
also for the entire molecular cloud scale with lower flux ratio. The abundance
ratio inside clouds shows a strong
correlation with column density and temperature. This indicates that the
is dominated by a combination of chemical
fractionation, selectively dissociation, and self-shielding effect inside
clouds.Comment: 11 pages, 16 figures, 1 table, accepted by A
A Systematic Study of Associations between Supernova Remnants and Molecular Clouds
We universally search for evidence of kinematic and spatial correlation of
supernova remnant (SNR) and molecular cloud (MC) associations for nearly all
SNRs in the coverage of the MWISP CO survey, i.e. 149 SNRs, 170 SNR candidates,
and 18 pure pulsar wind nebulae (PWNe) in 1 deg < l < 230 deg and -5.5 deg < b
< 5.5 deg. Based on high-quality and unbiased 12CO/13CO/C18O (J = 1--0) survey
data, we apply automatic algorithms to identify broad lines and spatial
correlations for molecular gas in each SNR region. The 91% of SNR-MC
associations detected previously are identified in this paper by CO line
emission. Overall, there could be as high as 80% of SNRs associated with MCs.
The proportion of SNRs associated with MCs is high within the Galactic
longitude less than ~50 deg. Kinematic distances of all SNRs that are
associated with MCs are estimated based on systemic velocities of associated
MCs. The radius of SNRs associated with MCs follows a lognormal distribution,
which peaks at ~8.1 pc. The progenitor initial mass of these SNRs follows a
power-law distribution with an index of ~-2.3 that is consistent with the
Salpeter index of -2.35. We find that SNR-MC associations are mainly
distributed in a thin disk along the Galactic plane, while a small amount
distributed in a thick disk. With the height of these SNRs from the Galactic
plane below ~45 pc, the distribution of the average radius relative to the
height of them is roughly flat, and the average radius increases with the
height when above ~45 pc.Comment: 77 pages, 20 figures, 4 tables (with machine-readable versions),
accepted for publication in ApJ
Frisson Waves: Exploring Automatic Detection, Triggering and Sharing of Aesthetic Chills in Music Performances
Frisson is the feeling and experience of physical reactions such as shivers, tingling skin, and goosebumps. Using entrainment
through facilitating interpersonal transmissions of embodied sensations, we present "Frisson Waves" with the aim to enhance
live music performance experiences. "Frisson Waves" is an exploratory real-time system to detect, trigger and share frisson
in a wave-like pattern over audience members during music performances. The system consists of a physiological sensing
wristband for detecting frisson and a thermo-haptic neckband for inducing frisson. In a controlled environment, we evaluate
detection (n=19) and triggering of frisson (n=15). Based on our findings, we conducted an in-the-wild music concert with
48 audience members using our system to share frisson. This paper summarizes a framework for accessing, triggering and
sharing frisson. We report our research insights, lessons learned, and limitations of "Frisson Waves".
Yan He, George Chernyshov, Jiawen Han, Dingding Zheng, Ragnar Thomsen, Danny Hynds, Muyu Liu, Yuehui Yang, Yulan
Ju, Yun Suen Pai, Kouta Minamizawa, Kai Kunze, and Jamie A War
Eightfold Fermionic Excitation in a Charge Density Wave Compound
Unconventional quasiparticle excitations in condensed matter systems have
become one of the most important research frontiers. Beyond two- and fourfold
degenerate Weyl and Dirac fermions, three-, six- and eightfold symmetry
protected degeneracies have been predicted however remain challenging to
realize in solid state materials. Here, charge density wave compound TaTe4 is
proposed to hold eightfold fermionic excitation and Dirac point in energy
bands. High quality TaTe4 single crystals are prepared, where the charge
density wave is revealed by directly imaging the atomic structure and a
pseudogap of about 45 meV on the surface. Shubnikov de-Haas oscillations of
TaTe4 are consistent with band structure calculation. Scanning tunneling
microscopy reveals atomic step edge states on the surface of TaTe4. This work
uncovers that charge density wave is able to induce new topological phases and
sheds new light on the novel excitations in condensed matter materials.Comment: Accepted by PRB:
https://journals.aps.org/prb/accepted/7907cK4eW0b1ee0b93fd67c1b42942bbb08eafc3
Isolation and functional characterization of a Medicago sativa L. gene, MsLEA3-1
A full-length cDNA of 1,728Β nt, called MsLEA3-1, was cloned from alfalfa by rapid amplification of cDNA ends from an expressed sequence tag homologous to soybean pGmPM10 (accession No. AAA91965.1). MsLEA3-1, encodes a deduced protein of 436 amino acids, a calculated molecular weight of 47.0Β kDa, a theoretical isoelectric point of 5.18, and closest homology with late embryogenesis abundant proteins in soybean. Sequence homology suggested a signal peptide in the N terminus, and subcellular localization with GFP revealed that MsLEA3-1 was localized preferentially to the nucleolus. The transcript titre of MsLEA3-1 was strongly enriched in leaves compared with roots and stems of mature alfalfa plants. Gene expression of MsLEA3-1 was strongly induced when seedlings were treated with NaCl and ABA. Expression of the MsLEA3-1 transgenic was detected in transgenic tobacco. Malondialdehyde content and, electrical conductivity content were reduced and electrical conductivity and proline content were increased in transgenic tobacco compared with non-transgenic tobacco under salt stress. The results showed that accumulation of the MsLEA3-1 protein in the vegetative tissues of transgenic plants enhanced their tolerance to salt stress. These results demonstrate a role for the MsLEA3-1 protein in stress protection and suggest the potential of the MsLEA3-1 gene for genetic engineering of salt tolerance
Biochemical investigation of kraft lignin degradation by Pandoraea sp. B-6 isolated from bamboo slips
Genetic analysis and fine mapping of the pubescence gene GL6 in rice (Oryza sativa L.)
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