Beirão, P. and Armus, L. and Appleton, P. N. and Murphy, E. J. and Helou, G. (2010) Far-infrared line imaging of the starburst ring in NGC 1097 with the Herschel/PACS spectrometer. Astronomy and Astrophysics, 518 . Art. No. L60. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20101129-100014152
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NGC 1097 is a nearby SBb galaxy with a Seyfert nucleus and a bright starburst ring. We study the physical properties of the interstellar medium (ISM) in the ring using spatially resolved far-infrared spectral maps of the circumnuclear starburst ring of NGC 1097, obtained with the PACS spectrometer on board the Herschel Space Observatory. In particular, we map the important ISM cooling and diagnostic emission lines of [OI] 63 μm, [OIII] 88 μm, [NII] 122 μm, [CII] 158 μm and [NII] 205 μm. We observe that in the [OI] 63 μm, [OIII] 88 μm, and [NII] 122 μm line maps, the emission is enhanced in clumps along the NE part of the ring. We observe evidence of rapid rotation in the circumnuclear ring, with a rotation velocity of ~220 km s^(−1) (inclination uncorrected) measured in all lines. The [OI] 63 μm/[CII] 158 μm ratio varies smoothly throughout the central region, and is enhanced on the northeastern part of the ring, which may indicate a stronger radiation field. This enhancement coincides with peaks in the [OI] 63 μm and [OIII] 88 μm maps. Variations of the [NII] 122 μm/[NII] 205 μm ratio correspond to a range in the ionized gas density between 150 and 400 cm^(−3).
|Additional Information:||© 2010 ESO. Received 30 March 2010, Accepted 3 May 2010, Published online 16 July 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. This work is based [in part] on observations made with Herschel, a European Space Agency Cornerstone Mission with significant participation by NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KUL, CSL, IMEC (Belgium); CEA, OAMP (France); MPIA (Germany); IFSI, OAP/AOT, OAA/CAISMI, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI (Italy), and CICT/MCT (Spain). Data presented in this paper were analyzed using The Herschel Interactive Processing Environment (HIPE), a joint development by the Herschel Science Ground Segment Consortium, consisting of ESA, the NASA Herschel Science Center, and the HIFI, PACS and SPIRE consortia. We would like to thank Dario Fadda and Jeff Jacobson for software support and Hanae Inami for the help on the velocity diagram.|
|Subject Keywords:||photon-dominated region, infrared: galaxies, galaxies: Seyfert, galaxies: starburst, techniques: imaging spectroscopy, galaxies: individual: NGC 1097|
|Official Citation:||Far-infrared line imaging of the starburst ring in NGC 1097 with the Herschel/PACS spectrometer P. Beirão, L. Armus, P. N. Appleton, J.-D. T. Smith, K. V. Croxall, E. J. Murphy, D. A. Dale, G. Helou, R. C. Kennicutt, D. Calzetti, A. D. Bolatto, B. R. Brandl, A. F. Crocker, B. T. Draine, G. Dumas, C. W. Engelbracht, A. Gil de Paz, K. D. Gordon, B. Groves, C.-N. Hao, J. L. Hinz, L. K. Hunt, B. D. Johnson, J. Koda, O. Krause, A. K. Leroy, S. E. Meidt, J. Richer, H.-W. Rix, N. Rahman, H. Roussel, K. M. Sandstrom, M. Sauvage, E. Schinnerer, R. A. Skibba, S. Srinivasan, F. Walter, B. E. Warren, C. D. Wilson, M. G. Wolfire and S. Zibetti A&A 518 L60 (2010) DOI: 10.1051/0004-6361/201014592|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Benjamin Perez|
|Deposited On:||29 Nov 2010 22:14|
|Last Modified:||26 Dec 2012 12:41|
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