Zobrazeno 1 - 10
of 2 761
pro vyhledávání: '"P, Sipilä"'
The rate coefficients of various isotopic variations of the H2+ + H2 and H3+ + H2 reactions in the 10-250 K temperature range were measured using a cryogenic 22 pole radio frequency ion trap. The processes involving diatomic ions were found to behave
Externí odkaz:
http://arxiv.org/abs/2412.02206
Publikováno v:
Neural Networks 2025, 181, 106774
Modelling multivariate spatio-temporal data with complex dependency structures is a challenging task but can be simplified by assuming that the original variables are generated from independent latent components. If these components are found, they c
Externí odkaz:
http://arxiv.org/abs/2409.04162
Autor:
Pineda, Jaime E., Soler, Juan D., Offner, Stella, Koch, Eric W., Segura-Cox, Dominique M., Neri, Roberto, Kuffmeier, Michael, Ivlev, Alexei V., Valdivia-Mena, Maria Teresa, Sipilä, Olli, Maureira, Maria Jose, Caselli, Paola, Cunningham, Nichol, Schmiedeke, Anika, Gieser, Caroline, Chen, Michael, Spezzano, Silvia
Publikováno v:
A&A 690, L5 (2024)
Context. Turbulence is a key component of molecular cloud structure. It is usually described by a cascade of energy down to the dissipation scale. The power spectrum for subsonic incompressible turbulence is $k^{-5/3}$, while for supersonic turbulenc
Externí odkaz:
http://arxiv.org/abs/2409.00392
Publikováno v:
A&A 690, A280 (2024)
We investigated the effect of time-dependent ice growth on dust grains on the opacity and hence on the dust temperature in a collapsing molecular cloud core, with the aim of quantifying the effect of the dust temperature variations on ice abundances
Externí odkaz:
http://arxiv.org/abs/2408.17202
Autor:
Harju, Jorma, Vastel, Charlotte, Sipilae, Olli, Redaelli, Elena, Caselli, Paola, Pineda, Jaime E., Belloche, Arnaud, Wyrowski, Friedrich
Publikováno v:
A&A 688, A117 (2024)
(abridged) We have mapped the prestellar core H-MM1 in Ophiuchus in rotational lines of ortho-H2D+ (oH2D+), N2H+, and DCO+ at the wavelength 0.8 mm with the Large APEX sub-Millimeter Array (LAsMA) multibeam receiver of the Atacama Pathfinder EXperime
Externí odkaz:
http://arxiv.org/abs/2405.20004
Scientific text is a promising source of data in materials science, with ongoing research into utilising textual data for materials discovery. In this study, we developed and tested a novel approach to extract material-property relationships from sci
Externí odkaz:
http://arxiv.org/abs/2405.15290
Autor:
Jensen, S. S., Spezzano, S., Caselli, P., Sipilä, O., Redaelli, E., Giers, K., Asensio, J. Ferrer
We aim to determine the $^{14}$N/$^{15}$N and $^{12}$C/$^{13}$C ratios for HCN in six starless and prestellar cores and compare the results between the direct method using radiative transfer modeling and the indirect double isotope method assuming a
Externí odkaz:
http://arxiv.org/abs/2403.04408
Autor:
Pineda, Jaime E., Sipilä, Olli, Segura-Cox, Dominique M., Valdivia-Mena, Maria Teresa, Neri, Roberto, Kuffmeier, Michael, Ivlev, Alexei V., Offner, Stella S. R., Maureira, Maria Jose, Caselli, Paola, Spezzano, Silvia, Cunningham, Nichol, Schmiedeke, Anika, Chen, Mike
Publikováno v:
A&A 686, A162 (2024)
Electron fraction and cosmic-ray ionization rates (CRIR) in star-forming regions are important quantities in astrochemical modeling and are critical to the degree of coupling between neutrals, ions, and electrons, which regulates the dynamics of the
Externí odkaz:
http://arxiv.org/abs/2402.16202
Autor:
Lin, Yuxin, Wyrowski, Friedrich, Liu, Hauyu Baobab, Gong, Yan, Sipilä, Olli, Izquierdo, Andrés F., Csengeri, Timea, Ginsburg, Adam, Li, Guang-Xing, Spezzano, Silvia, Pineda, Jaime E., Leurini, Silvia, Caselli, Paola, Menten, Karl M.
W43-main is a massive molecular complex located at the interaction of the Scutum arm and the Galactic bar undergoing starburst activities. We aim to investigate the gas dynamics, in particular, the prevailing shock signatures from the cloud to clump
Externí odkaz:
http://arxiv.org/abs/2401.17192
Autor:
Petrashkevich, I. V., Punanova, A. F., Caselli, P., Sipilä, O., Pineda, J. E., Friesen, R. K., Korotaeva, M. G., Vasyunin, A. I.
In this work, we study deuterium fractionation in four starless cores in the low-mass star-forming region L1688 in the Ophiuchus molecular cloud. We study how the deuterium fraction ($R_D$) changes with environment, compare deuteration of ions and ne
Externí odkaz:
http://arxiv.org/abs/2401.04415