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ID:
559069.0,
MPI für Astronomie / Publikationen_mpia |
Far-infrared line imaging of the starburst ring in NGC 1097 with the Herschel/PACS spectrometer |
Authors: | Beirão, P.; Armus, L.; Appleton, P. N.; Smith, J. D. T.; Croxall, K. V.; Murphy, E. J.; Dale, D. A.; Helou, G.; Kennicutt, R. C.; Calzetti, D.; Bolatto, A. D.; Brandl, B. R.; Crocker, A. F.; Draine, B. T.; Dumas, G.; Engelbracht, C. W.; Gil de Paz, A.; Gordon, K. D.; Groves, B.; Hao, C. N.; Hinz, J. L.; Hunt, L. K.; Johnson, B. D.; Koda, J.; Krause, O.; Leroy, A. K.; Meidt, S. E.; Richer, J.; Rix, H. W.; Rahman, N.; Roussel, H.; Sandstrom, K. M.; Sauvage, M.; Schinnerer, E.; Skibba, R. A.; Srinivasan, S.; Walter, F.; Warren, B. E.; Wilson, C. D.; Wolfire, M. G.; Zibetti, S. | Language: | English | Date of Publication (YYYY-MM-DD): | 2010 | Title of Journal: | Astronomy and Astrophysics | Journal Abbrev.: | A&A | Volume: | 518 | Start Page: | id.L60 | Review Status: | Peer-review | Audience: | Experts Only | Abstract / Description: | 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 üm, [OIII] 88 üm, [NII] 122 üm, [CII] 158 üm and [NII] 205 üm. We observe that in the [OI] 63 üm, [OIII] 88 üm, and [NII] 122 üm 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 üm/[CII] 158 üm 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 üm and [OIII] 88 üm maps. Variations of the [NII] 122 üm/[NII] 205 üm ratio correspond to a range in the ionized gas density between 150 and 400 cm-3. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. | Free Keywords: | photon-dominated region; infrared: galaxies; galaxies: Seyfert; galaxies: starburst; techniques: imaging spectroscopy; galaxies: individual: NGC 1097 | External Publication Status: | published | Document Type: | Article |
Communicated by: | N. N. | Affiliations: | MPI für Astronomie
| Identifiers: | URL:http://adsabs.harvard.edu/abs/2010A%26A...518L..60... [ID No:1] | |
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