Complex distribution and velocity field of molecular gas in NGC 1316 as revealed by the Morita Array of ALMA

Kana Morokuma-Matsui, Paolo Serra, Filippo M. MacCagni, Bi Qing For, Jing Wang, Kenji Bekki, Tomoki Morokuma, Fumi Egusa, Daniel Espada, Rie E. Miura, Kouichiro Nakanishi, Bärbel S. Koribalski, Tsutomu T. Takeuchi

Research output: Contribution to journalArticle

Abstract

We present the results of 12CO(J = 1-0) mosaicing observations of the cD galaxy NGC 1316 at kiloparsec resolution performed with the Morita Array of the Atacama Large Millimeter/submillimeter Array (ALMA). We reveal the detailed distribution of the molecular gas in the central region for the first time: a shell structure in the northwest, a barely resolved blob in the southeast of the center, and some clumps between them. The total molecular gas mass obtained with a standard Milky Way CO-to-H2 conversion factor is $(5.62 \pm 0.53) × 108, Mo , which is consistent with previous studies. The disturbed velocity field of the molecular gas suggests that the molecular gas was injected very recently (<1 Gyr) if it has an external origin, and is in the process of settling into a rotating disk. Assuming that a low-mass gas-rich galaxy has accreted, the gas-to-dust ratio and H2-to-H i ratio are unusually low (∼28) and high (∼5.6), respectively. To explain these ratios additional processes should be taken into account, such as effective dust formation and conversion from atomic to molecular gas during the interaction. We also discuss the interaction between the nuclear jet and the molecular gas.

Original languageEnglish
Article number85
JournalPublications of the Astronomical Society of Japan
Volume71
Issue number4
DOIs
Publication statusPublished - 1 Aug 2019

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molecular gases
velocity distribution
gas
dust
galaxies
rotating disks
settling
clumps
gases
distribution
interactions
shell

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Morokuma-Matsui, Kana ; Serra, Paolo ; MacCagni, Filippo M. ; For, Bi Qing ; Wang, Jing ; Bekki, Kenji ; Morokuma, Tomoki ; Egusa, Fumi ; Espada, Daniel ; Miura, Rie E. ; Nakanishi, Kouichiro ; Koribalski, Bärbel S. ; Takeuchi, Tsutomu T. / Complex distribution and velocity field of molecular gas in NGC 1316 as revealed by the Morita Array of ALMA. In: Publications of the Astronomical Society of Japan. 2019 ; Vol. 71, No. 4.
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title = "Complex distribution and velocity field of molecular gas in NGC 1316 as revealed by the Morita Array of ALMA",
abstract = "We present the results of 12CO(J = 1-0) mosaicing observations of the cD galaxy NGC 1316 at kiloparsec resolution performed with the Morita Array of the Atacama Large Millimeter/submillimeter Array (ALMA). We reveal the detailed distribution of the molecular gas in the central region for the first time: a shell structure in the northwest, a barely resolved blob in the southeast of the center, and some clumps between them. The total molecular gas mass obtained with a standard Milky Way CO-to-H2 conversion factor is $(5.62 \pm 0.53) × 108, Mo , which is consistent with previous studies. The disturbed velocity field of the molecular gas suggests that the molecular gas was injected very recently (<1 Gyr) if it has an external origin, and is in the process of settling into a rotating disk. Assuming that a low-mass gas-rich galaxy has accreted, the gas-to-dust ratio and H2-to-H i ratio are unusually low (∼28) and high (∼5.6), respectively. To explain these ratios additional processes should be taken into account, such as effective dust formation and conversion from atomic to molecular gas during the interaction. We also discuss the interaction between the nuclear jet and the molecular gas.",
keywords = "galaxies: elliptical and lenticular, cD, galaxies: individual (NGC 1316), galaxies: interactions, galaxies: ISM, radio lines: ISM",
author = "Kana Morokuma-Matsui and Paolo Serra and MacCagni, {Filippo M.} and For, {Bi Qing} and Jing Wang and Kenji Bekki and Tomoki Morokuma and Fumi Egusa and Daniel Espada and Miura, {Rie E.} and Kouichiro Nakanishi and Koribalski, {B{\"a}rbel S.} and Takeuchi, {Tsutomu T.}",
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Morokuma-Matsui, K, Serra, P, MacCagni, FM, For, BQ, Wang, J, Bekki, K, Morokuma, T, Egusa, F, Espada, D, Miura, RE, Nakanishi, K, Koribalski, BS & Takeuchi, TT 2019, 'Complex distribution and velocity field of molecular gas in NGC 1316 as revealed by the Morita Array of ALMA' Publications of the Astronomical Society of Japan, vol. 71, no. 4, 85. https://doi.org/10.1093/pasj/psz067

Complex distribution and velocity field of molecular gas in NGC 1316 as revealed by the Morita Array of ALMA. / Morokuma-Matsui, Kana; Serra, Paolo; MacCagni, Filippo M.; For, Bi Qing; Wang, Jing; Bekki, Kenji; Morokuma, Tomoki; Egusa, Fumi; Espada, Daniel; Miura, Rie E.; Nakanishi, Kouichiro; Koribalski, Bärbel S.; Takeuchi, Tsutomu T.

In: Publications of the Astronomical Society of Japan, Vol. 71, No. 4, 85, 01.08.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Complex distribution and velocity field of molecular gas in NGC 1316 as revealed by the Morita Array of ALMA

AU - Morokuma-Matsui, Kana

AU - Serra, Paolo

AU - MacCagni, Filippo M.

AU - For, Bi Qing

AU - Wang, Jing

AU - Bekki, Kenji

AU - Morokuma, Tomoki

AU - Egusa, Fumi

AU - Espada, Daniel

AU - Miura, Rie E.

AU - Nakanishi, Kouichiro

AU - Koribalski, Bärbel S.

AU - Takeuchi, Tsutomu T.

PY - 2019/8/1

Y1 - 2019/8/1

N2 - We present the results of 12CO(J = 1-0) mosaicing observations of the cD galaxy NGC 1316 at kiloparsec resolution performed with the Morita Array of the Atacama Large Millimeter/submillimeter Array (ALMA). We reveal the detailed distribution of the molecular gas in the central region for the first time: a shell structure in the northwest, a barely resolved blob in the southeast of the center, and some clumps between them. The total molecular gas mass obtained with a standard Milky Way CO-to-H2 conversion factor is $(5.62 \pm 0.53) × 108, Mo , which is consistent with previous studies. The disturbed velocity field of the molecular gas suggests that the molecular gas was injected very recently (<1 Gyr) if it has an external origin, and is in the process of settling into a rotating disk. Assuming that a low-mass gas-rich galaxy has accreted, the gas-to-dust ratio and H2-to-H i ratio are unusually low (∼28) and high (∼5.6), respectively. To explain these ratios additional processes should be taken into account, such as effective dust formation and conversion from atomic to molecular gas during the interaction. We also discuss the interaction between the nuclear jet and the molecular gas.

AB - We present the results of 12CO(J = 1-0) mosaicing observations of the cD galaxy NGC 1316 at kiloparsec resolution performed with the Morita Array of the Atacama Large Millimeter/submillimeter Array (ALMA). We reveal the detailed distribution of the molecular gas in the central region for the first time: a shell structure in the northwest, a barely resolved blob in the southeast of the center, and some clumps between them. The total molecular gas mass obtained with a standard Milky Way CO-to-H2 conversion factor is $(5.62 \pm 0.53) × 108, Mo , which is consistent with previous studies. The disturbed velocity field of the molecular gas suggests that the molecular gas was injected very recently (<1 Gyr) if it has an external origin, and is in the process of settling into a rotating disk. Assuming that a low-mass gas-rich galaxy has accreted, the gas-to-dust ratio and H2-to-H i ratio are unusually low (∼28) and high (∼5.6), respectively. To explain these ratios additional processes should be taken into account, such as effective dust formation and conversion from atomic to molecular gas during the interaction. We also discuss the interaction between the nuclear jet and the molecular gas.

KW - galaxies: elliptical and lenticular, cD

KW - galaxies: individual (NGC 1316)

KW - galaxies: interactions

KW - galaxies: ISM

KW - radio lines: ISM

UR - http://www.scopus.com/inward/record.url?scp=85070828988&partnerID=8YFLogxK

U2 - 10.1093/pasj/psz067

DO - 10.1093/pasj/psz067

M3 - Article

VL - 71

JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

SN - 0004-6264

IS - 4

M1 - 85

ER -