Zobrazeno 1 - 10
of 223
pro vyhledávání: '"Holdship, P."'
Autor:
Behrens, Erica, Mangum, Jeffrey G., Viti, Serena, Holdship, Jonathan, Huang, Ko-Yun, Bouvier, Mathilde, Butterworth, Joshua, Eibensteiner, Cosima, Harada, Nanase, Martin, Sergio, Sakamoto, Kazushi, Muller, Sebastien, Tanaka, Kunihiko, Colzi, Laura, Henkel, Christian, Meier, David S., Rivilla, Victor M., van der Werf, Paul P.
We use a neural network model and ALMA observations of HCN and HNC to constrain the physical conditions, most notably the cosmic-ray ionization rate (CRIR, zeta), in the Central Molecular Zone (CMZ) of the starburst galaxy NGC 253. Using output from
Externí odkaz:
http://arxiv.org/abs/2409.13821
Molecular emission from the galactic and extragalactic interstellar medium (ISM) is often used to determine the physical conditions of the dense gas. However, even from spatially resolved regions, the observed molecules are not necessarily arising fr
Externí odkaz:
http://arxiv.org/abs/2312.12646
Autor:
Hsu, Chia-Jung, Tan, Jonathan C., Holdship, Jonathan, Duo, Xu, Viti, Serena, Wu, Benjamin, Gaches, Brandt
Collisions between giant molecular clouds (GMCs) have been proposed as a mechanism to trigger massive star and star cluster formation. To investigate the astrochemical signatures of such collisions, we carry out 3D magnetohydrodynamics simulations of
Externí odkaz:
http://arxiv.org/abs/2308.11803
Autor:
Raouf, Mojtaba, Viti, Serena, García-Burillo, S., Richings, Alexander J., schaye, Joop, Bemis, Ashley, Nobels, Folkert S. J., Guainazzi, Matteo, Huang, Ko-Yun, Schaller, Matthieu, Impellizzeri, Violette, Holdship, Jon
We present hydrodynamic simulations of the interstellar medium (ISM) within the circumnuclear disk (CND) of a typical AGN-dominated galaxy influenced by mechanical feedback from an active galactic nucleus(AGN). The simulations are coupled with the CH
Externí odkaz:
http://arxiv.org/abs/2306.14573
Autor:
Huang, K. -Y., Viti, S., Holdship, J., Mangum, J. G., Martín, S., Harada, N., Muller, S., Sakamoto, K., Tanaka, K., Yoshimura, Y., Herrero-Illana, R., Meier, D. S., Behrens, E., van der Werf, P. P., Henkel, C., García-Burillo, S., Rivilla, V. M., Emig, K. L., Colzi, L., Humire, P. K., Aladro, R., Bouvier, M.
Publikováno v:
A&A 675, A151 (2023)
HNCO and SiO are well known shock tracers and have been observed in nearby galaxies, including the nearby (D=3.5 Mpc) starburst galaxy NGC 253. The simultaneous detection of these two species in regions where the star formation rate is high may be us
Externí odkaz:
http://arxiv.org/abs/2303.12685
The impact of including the reactions of C and CH with molecular hydrogen in a gas-grain network is assessed via a sensitivity analysis. To this end, we vary 3 parameters, namely, the efficiency for the reaction \ce{C + H2 -> CH2}, and the cosmic ray
Externí odkaz:
http://arxiv.org/abs/2301.04324
In order to understand grain-surface chemistry, one must have a good understanding of the reaction rate parameters. For diffusion-based reactions, these parameters are binding energies of the reacting species. However, attempts to estimate these valu
Externí odkaz:
http://arxiv.org/abs/2209.09347
Publikováno v:
A&A 667, A131 (2022)
Molecular line ratios, such as HCN(1-0)/HCO$^+$(1-0) and HCN(4-3)/CS(7-6), are routinely used to identify active galactic nuclei (AGN) activity in galaxies. Such ratios are, however, hard to interpret as they are highly dependent on the physics and e
Externí odkaz:
http://arxiv.org/abs/2209.05928
Autor:
Behrens, Erica, Mangum, Jeffrey G., Holdship, Jonathan, Viti, Serena, Harada, Nanase, Martin, Sergio, Sakamoto, Kazushi, Muller, Sebastien, Tanaka, Kunihiko, Nakanishi, Kouichiro, Herrero-Illana, Ruben, Yoshimura, Yuki, Aladro, Rebeca, Colzi, Laura, Emig, Kimberly L., Henkel, Christian, Huang, Ko-Yun, Humire, P. K., Meier, David S., Rivilla, Victor M.
We analyze HCN and HNC emission in the nearby starburst galaxy NGC 253 to investigate its effectiveness in tracing heating processes associated with star formation. This study uses multiple HCN and HNC rotational transitions observed using ALMA via t
Externí odkaz:
http://arxiv.org/abs/2209.06244
There exists much uncertainty surrounding interstellar grain-surface chemistry. One of the major reaction mechanisms is grain-surface diffusion for which the the binding energy parameter for each species needs to be known. However, these values vary
Externí odkaz:
http://arxiv.org/abs/2204.08347