Far-Infrared Line Imaging of the Starburst Ring in NGC 1097 with the Herschel/PACS Spectrometer

Abstract

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 Telescope. In particular, we map the important ISM cooling and diagnostic emission lines of [OI] 63 $\mu$m, [OIII] 88 $\mu$m, [NII] 122 $\mu$m, [CII] 158 $\mu$m and [NII] 205 $\mu$m. We observe that in the [OI] 63 $\mu$m, [OIII] 88 $\mu$m, and [NII] 122 $\mu$m 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$kms$^{-1}$(inclinationuncorrected)measuredinalllines.The[OI]63$μ$m/[CII]158$μ$mratiovariessmoothlythroughoutthecentralregion,andisenhancedonthenortheasternpartofthering,whichmayindicateastrongerradiationfield.Thisenhancementcoincideswithpeaksinthe[OI]63$μ$mand[OIII]88$μ$mmaps.Variationsofthe[NII]122$μ$m/[NII]205$μ$mratiocorrespondtoarangeintheionizedgasdensitybetween150and400cm$^{-3}$.

Accepted for publication on the A&A Herschel Special Issue

References in corpus (9)

• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• Diagnostics of irradiated dense gas in galaxy nuclei. II. A grid of XDR and PDR models
• Detection of the 205 um [NII] Line from the Carina Nebula
• Mid-Infrared Spectral Diagnostics of Nuclear and Extra-Nuclear Regions in Nearby Galaxies
• Streaming Motions Towards the Supermassive Black Hole in NGC 1097
• Enhanced dust heating in the bulges of early-type spiral galaxies
• Interferometric 12CO(J=2-1) image of the Nuclear Region of Seyfert 1 Galaxy NGC 1097
• Mapping far-IR emission from the central kiloparsec of NGC 1097

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