Depletion of heavy nitrogen in the cold gas of star-forming regions
K Furuya, Y Aikawa - The Astrophysical Journal, 2018 - iopscience.iop.org
We investigate nitrogen-isotope fractionation in forming and evolving molecular clouds
using gas-ice astrochemical simulations. We find that the bulk gas can become depleted in …
using gas-ice astrochemical simulations. We find that the bulk gas can become depleted in …
14N/15N ratio measurements in prestellar cores with N2H+: new evidence of 15N-antifractionation
E Redaelli, L Bizzocchi, P Caselli, J Harju… - Astronomy & …, 2018 - aanda.org
Context. The 15 N fractionation has been observed to show large variations among
astrophysical sources, depending both on the type of target and on the molecular tracer …
astrophysical sources, depending both on the type of target and on the molecular tracer …
ALMA ACA and Nobeyama observations of two Orion cores in deuterated molecular lines
K Tatematsu, T Liu, G Kim, HW Yi, JE Lee… - The Astrophysical …, 2020 - iopscience.iop.org
We mapped two molecular cloud cores in the Orion A cloud with the 7 m Array of the
Atacama Compact Array (ACA) of the Atacama Large Millimeter/submillimeterArray (ALMA) …
Atacama Compact Array (ACA) of the Atacama Large Millimeter/submillimeterArray (ALMA) …
A 3 mm spectral line study of the Central Molecular Zone infrared dark cloud G1. 75-0.08
O Miettinen, M Santander-García - Galaxies, 2024 - mdpi.com
Infrared dark clouds (IRDCs) are fruitful objects to study the fragmentation of interstellar
filaments and initial conditions and early stages of high-mass (M> 8 M⊙) star formation. We …
filaments and initial conditions and early stages of high-mass (M> 8 M⊙) star formation. We …
ALMA–IRDC – II. First high-angular resolution measurements of the 14N/15N ratio in a large sample of infrared-dark cloud cores
F Fontani, AT Barnes, P Caselli… - Monthly Notices of …, 2021 - academic.oup.com
The 14N/15N ratio in molecules exhibits a large variation in star-forming regions, especially
when measured from N2H+ isotopologues. However, there are only a few studies performed …
when measured from N2H+ isotopologues. However, there are only a few studies performed …
A Centimeter-wave Study of Methanol and Ammonia Isotopologues in Sgr B2 (N): Physical and Chemical Differentiation between Two Hot Cores
EAC Mills, J Corby, AR Clements… - The Astrophysical …, 2018 - iopscience.iop.org
We present new radio-frequency interferometric maps of emission from the 14 NH 3, 15 NH
3, and NH 2 D isotopologues of ammonia and the 12 CH 3 OH and 13 CH 3 OH …
3, and NH 2 D isotopologues of ammonia and the 12 CH 3 OH and 13 CH 3 OH …
Nitrogen fractionation in external galaxies
S Viti, F Fontani, I Jiménez-Serra… - Monthly Notices of the …, 2019 - academic.oup.com
In star-forming regions in our own Galaxy, the 14N/15N ratio is found to vary from∼ 100 in
meteorites, comets, and protoplanetary discs up to∼ 1000 in pre-stellar and star-forming …
meteorites, comets, and protoplanetary discs up to∼ 1000 in pre-stellar and star-forming …
Depletion of 15N in the center of L1544: Early transition from atomic to molecular nitrogen?
K Furuya, Y Watanabe, T Sakai, Y Aikawa… - Astronomy & …, 2018 - aanda.org
We performed sensitive observations of the N 15 ND+(1–0) and 15 NND+(1–0) lines toward
the prestellar core L1544 using the IRAM 30 m telescope. The lines are not detected down …
the prestellar core L1544 using the IRAM 30 m telescope. The lines are not detected down …
Seeds of Life in Space (SOLIS)-XI. First measurement of nitrogen fractionation in shocked clumps of the L1157 protostellar outflow
M Benedettini, S Viti, C Codella, C Ceccarelli… - Astronomy & …, 2021 - aanda.org
Context. The isotopic ratio of nitrogen presents a wide range of values in the Solar System:
from~ 140 in meteorites and comets to 441 in the solar wind. In star-forming systems, we …
from~ 140 in meteorites and comets to 441 in the solar wind. In star-forming systems, we …
Probing the initial conditions of high-mass star formation-IV. Gas dynamics and NH2D chemistry in high-mass precluster and protocluster clumps
Context. The initial stage of star formation is a complex area of study because of the high
densities (n H 2> 10 6 cm− 3) and low temperatures (T dust< 18 K) involved. Under such …
densities (n H 2> 10 6 cm− 3) and low temperatures (T dust< 18 K) involved. Under such …