Details of a Researcher - Tanaka, Kunihiko

Papers - Tanaka, Kunihiko

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Shock-induced HCNH+ abundance enhancement in the heart of the starburst galaxy NGC 253 unveiled by ALCHEMI

Y. Gong, C. Henkel, C. T. Bop, J. G. Mangum, E. Behrens, F. J. Du, S. B. Zhang, S. Martin, K. M. Menten, N. Harada, M. Bouvier, X. D. Tang, K. Tanaka, S. Viti, Y. T. Yan, W. Yang, R. Q. Mao, D. H. Quan

Astronomy and Astrophysics 2025

Joint Work, Accepted

Spatially-resolved spectro-photometric SED Modeling of NGC 253's Central Molecular Zone I. Studying the star formation in extragalactic giant molecular clouds

Humire, Pedro K. ; Dey, Subhrata ; Ronconi, Tommaso ; Sasse, Victor H. ; Cid Fernandes, Roberto ; Martín, Sergio ; Donevski, Darko search by orcid ; Małek, Katarzyna ; Fernández-Ontiveros, Juan A. ; Song, Yiqing ; Hamed, Mahmoud ; Mangum, Jeffrey G. ; Henkel, Christian ; Rivilla, Víctor M. ; Colzi, Laura ; Harada, N. ; Demarco, Ricardo ; Goyal, Arti ; Meier, David S. ; Panda, Swayamtrupta ; Krabbe, Ângela C. ; Yan, Yaoting ; Lopes, Amanda R. search by orcid ; Sakamoto, K. ; Muller, S. ; Tanaka, K. ; Yoshimura, Y. ; Nakanishi, K. ; Kanaan, Antonio ; Ribeiro, Tiago ; Schoenell, William ; Mendes de Oliveira, Claudia

Astronomy and Astrophysics 2025

Research paper (scientific journal), Joint Work, Accepted

Neural Network Constraints on the Cosmic-Ray Ionization Rate and Other Physical Conditions in NGC 253 with ALCHEMI Measurements of HCN and HNC

977 38 2024.12

Research paper (scientific journal), Joint Work, Accepted

Bright-rimmed clouds in IC 1396: I. Dynamics

Okada Yoko, Kabanovic Slawa, Güsten Rolf, Ossenkopf-Okada Volker, Schneider Nicola, Simon Robert, Buchbender Christof, Higgins Ronan, Yanitski Craig, Röllig Markus, Stutzki Jürgen, Ishihara Daisuke, Tanaka Kunihiko, Chambers Edward, Honingh Netty, Justen Matthias, Riquelme Denise

Astronomy and Astrophysics 690 ( 45 ) 2024.10

Research paper (scientific journal), Joint Work, Accepted

Molecular isotopologue measurements toward super star clusters and the relation to their ages in NGC253 with ALCHEMI

Butterworth, J. , Viti, S. , Van der Werf, P. P. , Mangum, J. G. , Martín, S. , Harada, N. , Emig, K. L. , Muller, S. , Sakamoto, K. , Yoshimura, Y. , Tanaka, K. , Herrero-Illana, R. , Colzi, L. , Rivilla, V. M. , Huang, K. Y. , Bouvier, M. , Behrens, E. , Henkel, C. , Yan, Y. T. , Meier, D. S. , Zhou, D.

Astronomy and Astrophysics (EDP Science) 686 31 2024.06

Research paper (scientific journal), Joint Work, Accepted

Physical Properties of the Southwest Outflow Streamer in the Starburst Galaxy NGC 253 with ALCHEMI

Bao, Min ; Harada, Nanase ; Kohno, Kotaro ; Yoshimura, Yuki ; Egusa, Fumi ; Nishimura, Yuri ; Tanaka, Kunihiko ; Nakanishi, Kouichiro ; Martín, Sergio ; Mangum, Jeffrey G. ; Sakamoto, Kazushi ; Muller, Sébastien ; Bouvier, Mathilde ; Colzi, Laura search by orcid ; Emig, Kimberly L. ; Meier, David S. ; Henkel, Christian ; Humire, Pedro ; Huang, Ko-Yun ; Rivilla, Víctor M. ; van der Werf, Paul ; Viti, Serena

Astronomy & Astrophysics (EDP Science) 687 43 2024.05

Research paper (scientific journal), Joint Work, Accepted

The ALCHEMI atlas: principal component analysis reveals starburst evolution in NGC 253

Harada, Nanase ; Meier, David S. ; Martín, Sergio ; Muller, Sebastien ; Sakamoto, Kazushi ; Saito, Toshiki ; Gorski, Mark D. ; Henkel, Christian ; Tanaka, Kunihiko ; Mangum, Jeffrey G. ; Aalto, Susanne ; Aladro, Rebeca ; Bouvier, Mathilde ; Colzi, Laura search by orcid ; Emig, Kimberly L. ; Herrero-Illana, Rubén ; Huang, Ko-Yun ; Kohno, Kotaro ; König, Sabine ; Nakanishi, Kouichiro ; Nishimura, Yuri ; Takano, Shuro ; Rivilla, Víctor M. ; Viti, Serena ; Watanabe, Yoshimasa ; van der Werf, Paul P. , Yoshimura, Yuki

The Astrophysical Journal Supplement Series (IOP publishing) 271 38 2024.04

Research paper (scientific journal), Joint Work, Accepted

Volume Density Structure of the NGC253 CMZ through ALCHEMI Excitation Analysis

Tanaka, Kunihiko ; Mangum, Jeffrey G. ; Viti, Serena ; Martin, Sergio ; Harada, Nanase ; Sakamoto, Kazushi ; Muller, Sebastien ; Yoshimura, Yuki ; Nakanishi, Kouichiro ; Herrero Illana, Ruben ; Emig, Kimberly L. ; Muhle, S. ; Kaneko, Hiroyuki ; Tosaki, Tomoka ; Behrens, Erica ; Rivilla, Victor M. ; Colzi, Laura ; Nishimura, Yuri ; Humire, P. K. ; Bouvier, Mathilde ; Huang, Ko-Yun ; Butterworth, Joshua ; Meier, David S. ; van der Werf, Paul P.

The Astrophysical Journal (IOP publishing) 916 18 2024.01

Research paper (scientific journal), Joint Work, Lead author, Corresponding author, Accepted

FINER: Far-Infrared Nebular Emission Receiver for the Large Millimeter Telescope

Tamura, Yoichi ; Sakai, Takeshi ; Kawabe, Ryohei ; Kojima, Takafumi ; Taniguchi, Akio ; Takekoshi, Tatsuya ; Kang, Haoran ; Shan, Wenlei ; Hagimoto, Masato ; Okauchi, Norika ; Tetsuka, Airi ; Inoue, Akio K. ; Kohno, Kotaro ; Tanaka, Kunihiko ; Bakx, Tom J. L. C. ; Fudamoto, Yoshinobu ; Fujita, Kazuyuki ; Harikane, Yuichi ; Hashimoto, Takuya ; Hatsukade, Bunyo ; Hughes, David H. ; Iino, Takahiro ; Kimura, Yuki ; Maezawa, Hiroyuki ; Matsuda, Yuichi ; Mawatari, Ken ; Nakajima, Taku ; Nakatsubo, Shunichi ; Oshima, Tai ; Sagawa, Hideo ; Schloerb, F. Peter ; Takahashi, Shigeru ; Taniguchi, Kotomi ; Tsujita, Akiyoshi ; Umehata, Hideki ; Yonetsu, Teppei ; Yun, Min S.

Proceedings paper presented in SPIE Astronomical Telescope and Instrumentation 2024 2024

A 10.24-GHz-wide digital spectrometer array system for LMT-FINER: system design and laboratory performance verification

Hagimoto, Masato ; Taniguchi, Akio ; Tamura, Yoichi ; Okauchi, Norika ; Kawamoto, Hiroaki ; Nakajima, Taku ; Hikosaka, Takumi ; Harada, Kenichi ; Taniguchi, Toru ; Kamazaki, Takeshi ; Sakai, Takeshi ; Tanaka, Kunihiko ; Kawabe, Ryohei

Proceedings paper presented in SPIE Astronomical Telescope and Instrumentation 2024 2024

An ALCHEMI inspection of sulphur-bearing species towards the central molecular zone of NGC 253

Bouvier, M. ; Viti, S. ; Behrens, E. ; Butterworth, J. ; Huang, K. -Y. ; Mangum, J. G. ; Harada, N. ; Martín, S. ; Rivilla, V. M. ; Muller, S. ; Sakamoto, K. ; Yoshimura, Y. ; Tanaka, K. ; Nakanishi, K. ; Herrero-Illana, R. ; Colzi, L. ; Gorski, M. D. ; Henkel, C. ; Humire, P. K. ; Meier, D. S. ; van der Werf, P. P. ; Yan, Y. T.

Astronomy & Astrophysics (EDP Science) 2024

Research paper (scientific journal), Joint Work, Accepted

Distributions of the Density and Kinetic Temperature of the Molecular Gas in the Central Region of NGC 613 Using Hierarchical Bayesian Inference

Kaneko, Hiroyuki; Tosaki, Tomoka; Tanaka, Kunihiko ; Miyamoto, Yusuke

The Astrophysical Journal (IOP publishing) 953 139 2023.08

Research paper (scientific journal), Joint Work, Accepted

Reconstructing the shock history in the CMZ of NGC 253 with ALCHEMI

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. search by orcid ; Humire, P. K. ; ...

2023.03

Research paper (scientific journal), Joint Work, Accepted

Tracing Interstellar Heating: An ALCHEMI Measurement of the HCN Isomers in NGC 253

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. Abstract

939 119 2022.11

Research paper (scientific journal), Accepted

ALCHEMI finds a "shocking" carbon footprint in the starburst galaxy NGC~253

Harada, Nanase ; Martin, Sergio ; Mangum, Jeff ; Sakamoto, Kazushi ; Muller, Sebastian ; Rivilla, Victor ; Henkel, Christian ; Meier, David ; Colzi, Laura ; Yamagishi, Mitsuyoshi ; Tanaka, Kunihiko ; Nakanishi, Kouichiro ; Herrero-Illana, Ruben ; Yoshimura, Yuki ; Humire, Pedro ; Aladro, Rebeca ; van der Werf, Paul ; Emig, Kim

938 80 2022.10

Research paper (scientific journal), Joint Work, Accepted

Methanol masers in NGC 253 with ALCHEMI

Humire, P. K. ; Henkel, C. ; Hernández-Gómez, A. ; Martín, S. ; Mangum, J. ; Harada, N. ; Muller, S. ; Sakamoto, K. ; Tanaka, K. ; Yoshimura, Y. ; Nakanishi, K. ; Mühle, S. ; Herrero-Illana, R. ; Meier, D. S. ; Caux, E. ; Aladro, R. ; Mauersberger, R. ; Viti, S. ; Colzi, L. ; Rivilla, V. M. ;

Astronomy and Astrophysics (Astronomy and Astrophysics) 663 33 2022.07

Research paper (scientific journal), Accepted, ISSN 00046361

Context. Methanol masers of Class I (collisionally pumped) and Class II (radiatively pumped) have been studied in great detail in our Galaxy in a variety of astrophysical environments such as shocks and star-forming regions and are they are helpful to analyze the properties of the dense interstellar medium. However, the study of methanol masers in external galaxies is still in its infancy. Aims. Our main goal is to search for methanol masers in the central molecular zone (CMZ; inner 500 pc) of the nearby starburst galaxy NGC253. Methods. Covering a frequency range between 84 and 373 GHz (λ = 3.6-0.8 mm) at high angular (1."6 ∼ 27 pc) and spectral (∼8-9 km s-1) resolution with ALCHEMI (ALMA Comprehensive High-resolution Extragalactic Molecular Inventory), we have probed dierent regions across the CMZ of NGC253. In order to look for methanol maser candidates, we employed the rotation diagram method and a set of radiative transfer models. Results.We detect for the first time masers above 84 GHz in NGC253, covering an ample portion of the J-1 (J-1)0-E line series (at 84, 132, 229, and 278 GHz) and the J0 (J-1)1 A series (at 95, 146, and 198 GHz). This confirms the presence of the Class I maser line at 84 GHz, which was already reported, but now being detected in more than one location. For the J-1 (J-1)0-E line series, we observe a lack of Class I maser candidates in the central star-forming disk. Conclusions. The physical conditions for maser excitation in the J-1 (J-1)0-E line series can be weak shocks and cloud-cloud collisions as suggested by shock tracers (SiO and HNCO) in bi-symmetric shock regions located in the outskirts of the CMZ. On the other hand, the presence of photodissociation regions due to a high star-formation rate would be needed to explain the lack of Class I masers in the very central regions.

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Energizing Star Formation: The Cosmic-Ray Ionization Rate in NGC 253 Derived from ALCHEMI Measurements of H<inf>3</inf>O+and SO

Holdship J., Mangum J.G., Viti S., Behrens E., Harada N., Martín S., Sakamoto K., Muller S., Tanaka K., Nakanishi K., Herrero-Illana R., Yoshimura Y., Aladro R., Colzi L., Emig K.L., Henkel C., Nishimura Y., Rivilla V.M., Van Der Werf P.P.

Astrophysical Journal (Astrophysical Journal) 931 ( 2 ) 2022.06

Research paper (scientific journal), Accepted, ISSN 0004637X

The cosmic-ray ionization rate (CRIR) is a key parameter in understanding the physical and chemical processes in the interstellar medium. Cosmic rays are a significant source of energy in star formation regions, impacting the physical and chemical processes that drive the formation of stars. Previous studies of the circum-molecular zone of the starburst galaxy NGC 253 have found evidence for a high CRIR value: 103-106 times the average CRIR within the Milky Way. This is a broad constraint, and one goal of this study is to determine this value with much higher precision. We exploit ALMA observations toward the central molecular zone of NGC 253 to measure the CRIR. We first demonstrate that the abundance ratio of H3O+ and SO is strongly sensitive to the CRIR. We then combine chemical and radiative transfer models with nested sampling to infer the gas properties and CRIR of several star-forming regions in NGC 253 from emission from their transitions. We find that each of the four regions modeled has a CRIR in the range (1-80) × 10-14 s-1 and that this result adequately fits the abundances of other species that are believed to be sensitive to cosmic rays, including C2H, HCO+, HOC+, and CO. From shock and photon-dominated/X-ray dominated region models, we further find that neither UV-/X-ray-driven nor shock-dominated chemistry is a viable single alternative as none of these processes can adequately fit the abundances of all of these species.

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Energizing Star Formation: The Cosmic Ray Ionization Rate in NGC 253 Derived From ALCHEMI Measurements of H$_3$O$^+$ and SO

Holdship, Jonathan ; Mangum, Jeffrey G. ; Viti, Serena ; Behrens, Erica ; Harada, Nanase ; Martín, Sergio ; Sakamoto, Kazushi ; Muller, Sebastien ; Tanaka, Kunihiko ; Nakanishi, Kouichiro ; Herrero-Illana, Rubén ; Yoshimura, Yuki ; Aladro, Rebeca ; Colzi, Laura ; Emig, Kimberly L. ; Henkel, Christian ; Nishimura, Yuri ; Rivilla, Víctor M. ; van der Werf, Paul P.

The Astrophysical Journal 931 89 2022.06

Research paper (scientific journal), Joint Work, Accepted

First extragalactic detection of a phosphorus-bearing molecule with ALCHEMI: Phosphorus nitride (PN)

Haasler, D. search by orcid ; Rivilla, V. M. ; Martín, S. ; Holdship, J. ; Viti, S. ; Harada, N. ; Mangum, J. ; Sakamoto, K. ; Muller, S. ; Tanaka, K. ; Yoshimura, Y. ; Nakanishi, K. ; Colzi, L. search by orcid ; Hunt, L. search by orcid ; Emig, K. L. ; Aladro, R. ; Humire, P. ; Henkel, C. ; van der Werf, P.

Astronomy & Astrophysics (Astronomy and Astrophysics) 659 158 2022.03

Research paper (scientific journal), Joint Work, Accepted, ISSN 00046361

Context. Phosphorus (P) is a crucial element for life given its central role in several biomolecules. P-bearing molecules have been discovered in different regions of the Milky Way, but not yet towards an extragalactic environment. Aims. We searched for P-bearing molecules outside the Milky Way towards the nearby starburst Galaxy NGC 253. Methods. Using observations from the ALMA Comprehensive High-resolution Extragalactic Molecular Inventory (ALCHEMI) project, we used the MAdrid Data CUBe Analysis package to model the emission of P-bearing molecules assuming local thermodynamic equilibrium (LTE) conditions. We also performed a non-LTE analysis using SpectralRadex. Results. We report the detection of a P-bearing molecule, phosphorus nitride (PN), for the first time in an extragalactic environment, towards two giant molecular clouds (GMCs) of NGC 253. The LTE analysis yields total PN beam-averaged column densities N = (1.20 ± 0.09) - 1013 cm-2 and N = (6.5 ± 1.6) - 1012 cm-2, which translate into abundances with respect to H2 of = (8.0 ± 1.0) - 10-12 and = (4.4 ± 1.2) - 10-12. We derived a low excitation temperature of Tex = (4.4 ± 1.3) K towards the GMC with the brightest PN emission, which indicates that PN is sub-thermally excited. The non-LTE analysis results in column densities consistent with the LTE values. We also searched for other P-bearing molecules (PO, PH3, CP, and CCP), and upper limits were derived. The derived PO/PN ratios are < 1.3 and < 1.7. The abundance ratio between PN and the shock-tracer SiO derived towards NGC 253 follows the same trend previously found towards Galactic sources. Conclusions. Comparison of the observations with chemical models indicates that the derived molecular abundances of PN in NGC 253 can be explained by shock-driven chemistry followed by cosmic-ray-driven photochemistry.

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Starburst Energy Feedback Seen through HCO+/HOC+Emission in NGC 253 from ALCHEMI

Harada N., Martín S., Mangum J.G., Sakamoto K., Muller S., Tanaka K., Nakanishi K., Herrero-Illana R., Yoshimura Y., Mühle S., Aladro R., Colzi L., Rivilla V.M., Aalto S., Behrens E., Henkel C., Holdship J., Humire P.K., Meier D.S., Nishimura Y., Van Der Werf P.P., Viti S.

Astrophysical Journal (Astrophysical Journal) 923 ( 1 ) 2021.12

ISSN 0004637X

Molecular abundances are sensitive to the UV photon flux and cosmic-ray ionization rate. In starburst environments, the effects of high-energy photons and particles are expected to be stronger. We examine these astrochemical signatures through multiple transitions of HCO+ and its metastable isomer HOC+ in the center of the starburst galaxy NGC 253 using data from the Atacama Large Millimeter/submillimeter Array large program ALMA Comprehensive High-resolution Extragalactic Molecular inventory. The distribution of the HOC+(1-0) integrated intensity shows its association with "superbubbles,"cavities created either by supernovae or expanding H ii regions. The observed HCO+/HOC+ abundance ratios are ∼10-150, and the fractional abundance of HOC+ relative to H2 is ∼1.5 × 10-11-6 × 10-10, which implies that the HOC+ abundance in the center of NGC 253 is significantly higher than in quiescent spiral arm dark clouds in the Galaxy and the Galactic center clouds. Comparison with chemical models implies either an interstellar radiation field of G 0 ⪆ 103 if the maximum visual extinction is ⪆5, or a cosmic-ray ionization rate of ζ ⪆ 10-14 s-1 (3-4 orders of magnitude higher than that within clouds in the Galactic spiral arms) to reproduce the observed results. From the difference in formation routes of HOC+, we propose that a low-excitation line of HOC+ traces cosmic-ray dominated regions, while high-excitation lines trace photodissociation regions. Our results suggest that the interstellar medium in the center of NGC 253 is significantly affected by energy input from UV photons and cosmic rays, sources of energy feedback.

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