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http://dx.doi.org/10.5303/PKAS.2015.30.2.439

MOLECULAR GAS AND RADIO JET INTERACTION: A CASE STUDY OF THE SEYFERT 2 AGN M51  

MATSUSHITA, SATOKI (Academia Sinica Institute of Astronomy and Astrophysics)
TRUNG, DINH-V (Institute of Physics, Vietnamese Academy of Science & Technology)
BOONE, FRDERIC (Universite de Toulouse, UPS-OMP, IRAP)
KRIPS, MELANIE (Institute de Radio Astronomie Millimetrique)
LIM, JEREMY (Department of Physics, University of Hong Kong)
MULLER, SEBASTIEN (Department of Earth and Space Sciences, Chalmers University of Technology)
Publication Information
Publications of The Korean Astronomical Society / v.30, no.2, 2015 , pp. 439-442 More about this Journal
Abstract
We observed multiple CO transition lines and the HCN(1-0) line at ~ 1" (~ 34 pc) or higher resolution toward the Seyfert 2 nucleus of M51 using the IRAM Plateau de Bure Interferometer (PdBI) and the Submillimeter Array (SMA). All the images show very similar overall molecular gas distribution; there are two discrete clouds at the eastern and western sides of the nucleus, and the western cloud exhibits an elongated distribution and velocity gradient along the radio jet. In addition, high HCN(1-0)/CO(1-0) brightness temperature ratios of about unity have been observed, especially along the radio jet, similar to those observed in shocked molecular gas in our Galaxy. This strongly indicates that the molecular gas along the jet is shocked, that the radio jet and the molecular gas are interacting, and the jet is entraining both diffuse (CO) and dense (HCN) molecular gas outwards from the circumnuclear region. This is the first clear imaging of the outflowing molecular gas entrained by the AGN jet, and showing the detailed physical status of outflowing molecular gas. Since a relatively high HCN(1-0)/CO(1-0) ratio has been observed in the high velocity wing of ultraluminous infrared galaxies, it can also be explained by a similar mechanism to those we describe here.
Keywords
M51 (NGC 5194); Seyfert nucleus; molecular gas; jet; outflow;
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1 Aalto, S., Garcia-Burillo, S., Muller, S., Winters, J. M., van der Werf, P., Henkel, C., Costagliola, F., & Neri, R., 2012, Detection of HCN, HCO+, and HNC in the Mrk 231 Molecular Outflow. Dense Molecular Gas in the AGN Wind, A&A, 537, A44   DOI
2 Antonucci, R. R. J. & Miller, J. S., 1985, Spectropolarimetry and the Nature of NGC 1068, ApJ, 297, 621   DOI
3 Bradley, L. D., Kaiser, M. E., & Baan, W. A., 2004, Physical Conditions in the Narrow-Line Region of M51, ApJ, 603, 463   DOI
4 Chou, R. C. Y., Peck, A. B., Lim, J., Matsushita, S., Muller, S., Sawada-Satoh, S., Dinh-V-Trung, Boone, F., & Henkel, C., 2007, The Circumnuclear Molecular Gas in the Seyfert Galaxy NGC 4945, ApJ, 670, 116   DOI
5 Combes, F., Garcia-Burillo, S., & Casasola, V., et al., 2013, ALMA Observations of Feeding and Feedback in Nearby Seyfert Galaxies: An AGN-driven Outflow in NGC 1433, A&A, 558, A124   DOI
6 Crane, P.C., & van der Hulst, J.M., 1992, The Radio Jet in M51, AJ, 103, 1146   DOI
7 Davies, R. I., Maciejewski, W., Hicks, E. K. S., Tacconi, L. J., Genzel, R., & Engel, H., 2009, Stellar and Molecular Gas Kinematics of NGC 1097: Inflow Driven by a Nuclear Spiral, ApJ, 702, 114   DOI
8 Espada, D., Matsushita, S., & Peck, A., et al., 2009, Disentangling the Circumnuclear Environs of Centaurus A. I. High-Resolution Molecular Gas Imaging, ApJ, 695, 116   DOI
9 Fathi, K., Lundgren, A. A., & Kohno, K., et al., 2013, ALMA Follows Streaming of Dense Gas Down to 40 pc from the Supermassive Black Hole in NGC 1097, ApJL, 770, L27   DOI
10 Garcia-Burillo, S., Combes, F., & Usero, A., et al., 2014, Molecular Line Emission in NGC 1068 Imaged with ALMA. I. An AGN-Driven Outflow in the Dense Molecular Gas, A&A, 567, A125   DOI
11 Hagiwara, Y., Henkel, C., Menten, K. M., & Nakai, N., 2001, Water Maser Emission from the Active Nucleus in M51, ApJL, 560, L37   DOI
12 Hsieh, P.-Y., Matsushita. S., Lim, J., Kohno, K., & Sawada-Satoh, S., 2008, Interferometric $^{12}CO$ J = 2-1 Image of the Nuclear Region of Seyfert 1 Galaxy NGC 1097, ApJ, 683, 70   DOI
13 Jackson, J. M., Paglione, T. A. D., Ishizuki, S., & Nguyen-Q-Rieu, 1993, Dense Molecular Gas toward the Nucleus of the Seyfert Galaxy NGC 1068, ApJL, 418, L13   DOI
14 Kohno, K., Kawabe, R., Tosaki T., & Okumura S. K., 1996, Aperture Synthesis CO and HCN Observations of M51:Dense Molecular Disk around a Low-Luminosity Active Galactic Nucleus, ApJL, 461, L29
15 Kohno, K., Matsushita, S., & Vila-Vilaro, B., et al., 2001, Dense Molecular Gas and Star Formation in Nearby Seyfert Galaxies, ASP Conf. Ser. 249, 672
16 Kohno, K., Muraoka, K.. & Hatsukade, B., et al., 2008, Tracing Star Formation in Galaxies with Molecular Line and Continuum Observations, EAS Publ. Ser. 31, 65   DOI
17 Kohno, K., Nakanishi, K., Tosaki, T., Muraoka, K., Miura, R., Ezawa, H., & Kawabe, R., 2008, Dense Gas in Normal and Active Galaxies, Ap&SS, 313, 279   DOI
18 Krips, M., Martin, S., & Eckart, A., et al., 2011, Submillimeter Array/Plateau de Bure Interferometer Multiple Line Observations of the Nearby Seyfert 2 Galaxy NGC 1068:Shock-Related Gas Kinematics and Heating in the Central 100 pc?, ApJ, 736, 37   DOI
19 Matsushita, S., Dinh-V-Trung, Boone, F., Krips, M., Lim, J., & Muller, S., 2014, Resolving the Bright HCN(1-0) Emission toward the Seyfert 2 Nucleus of M51: Shock Enhancement by Radio Jets andWeak Masing by Infrared Pumping?, ApJ, in press [arXiv:1410.7863]
20 Krips, M., Neri, R., & Garcia-Burillo, S., et al., 2007, Molecular Gas in NUclei of GAlaxies (NUGA): VI. Detection of a Molecular Gas Disk/Torus via HCN in the Seyfert 2 Galaxy NGC 6951?, A&A, 468, L63   DOI   ScienceOn
21 Matsushita, S., Muller, S., & Lim, J., 2007, Jet-Disturbed Molecular Gas Near the Seyfert 2 Nucleus in M51, A&A, 468, L49   DOI   ScienceOn
22 Matsushita, S., Sakamoto, K., & Kuo, C. -Y., et al., 2004, Submillimeter Array $^{12}CO$ (J=3-2) Interferometric Observations of the Central Region of M51, ApJL, 616, L55   DOI
23 Muller Sanchez, F., Davies, R. I., Genzel, R., Tacconi, L. J., Eisenhauer, F., Hicks, E. K. S., Friedrich, S., & Sternberg, A., 2009, Molecular Gas Streamers Feeding and Obscuring the Active Nucleus of NGC 1068, ApJ, 691, 749   DOI
24 Sani, E., Davies, R. I., & Sternberg, A., et al., 2012, Physical Properties of Dense Molecular Gas in Centres of Seyfert Galaxies, MNRAS, 424, 1963   DOI   ScienceOn
25 Takats, K. & Vinko, J., 2006, Distance Estimate and Progenitor Characteristics of SN 2005cs in M51, MNRAS, 372, 1735   DOI   ScienceOn
26 Umemoto, T., Iwata, T., Fukui, Y., Mikami, H., Yamamoto, S., Kameya, O., & Hirano, N., 1992, The Outflow in the L1157 Dark Cloud - Evidence for Shock Heating of the Interacting Gas, ApJL, 392, L83   DOI
27 Wright, M. C. H., Plambeck, R. L., & Wilner, D. J., 1996, A Multiline Aperture Synthesis Study of Orion-KL, ApJ, 469, 216   DOI