| Name | OT2_lzhiyuan_2 |
| Title | A Herschel/PACS mapping of far-infrared emission lines from the nuclear spiral in M31 |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342247148&instrument_name=PACS&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-zdze4tf |
| Author | zhiyuan, l. |
| Description | The nuclear spiral in M31, consisting of ionized and neutral dusty gas clouds, shows optical emission lines characteristic of LINERs. Yet the lack of UV radiation from either an active nucleus or massive young stars makes the ionizing source of this nearest LINER a longstanding puzzle. We propose a PACS spectroscopic mapping of several fine structure lines, including C II, O I and O III,from the nuclear spiral. We will derive for the first time the spatial distribution and kinematics of the circumnuclear neutral gas in M31, with an unparalleled linear resolution of 40 parsec for a massive external galaxy. These FIR lines, together with the optical and mid-IR emission lines mapped by HST and Spitzer observations, will enable us to assess the importance of various ionization/excitation mechanisms. Specifically, we will test the cosmic-ray heating scenario, which is favored by energetics considerations for the nuclear spiral. This study will advance our understanding of the physical regulation of galactic circumnuclear environments, which is in turn crucial to understanding the evolution of super-massive black holes and their host galaxies. |
| Publication | |
| Instrument | PACS_PacsLineSpec_large |
| Temporal Coverage | 2012-06-19T21:40:48Z/2012-06-20T07:34:13Z |
| Version | SPG v14.2.0 |
| Mission Description | Herschel was launched on 14 May 2009! It is the fourth cornerstone mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2012-12-20T02:34:23Z |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, zhiyuan et al., 2012, 'A Herschel/PACS mapping of far-infrared emission lines from the nuclear spiral in M31', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-zdze4tf |