| Name | OT2_tfritz_2 |
| Title | Discovering Sgr A* in the far infrared with Herschel |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342241284&instrument_name=PACS&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-u868v35 |
| Author | fritz, t. |
| Description | We propose to observe Sgr A*, the super massive black hole in the Center of the Milky Way, with Herschel/PACS. This will yield the first detection of Sgr A* in the far infrared. This is possible despite the large background because Sgr A* is a variable source. Its emission is known in the radio to sub-mm, near infrared and in the X-rays. Sgr A* shows a steady (quiescent) emission component with small variations and in addition occasional large amplitude flares. The quiescent emission is reaches its maximum in the sub-mm. However, the extent of this bump (caused by synchrotron radiation from thermal electrons) is not clear due to missing observations in the far infrared. The proposed observations would fill that gap. The emission in flares is most prominent in the near infrared and X-rays where the variable emission is simultaneous. The far infrared can provide decisive evidence for the true link between the near-infrared and sub-mm emission: whether it is one of these two cases or some other scenario. For answering these two questions we ask for time resolved photometry of Sgr A* with Herschel/PACS. |
| Publication | A Detection of Sgr A* in the Far Infrared . von Fellenberg Sebastiano D. et al. . The Astrophysical Journal, Volume 862, Issue 2, article id. 129, 17 pp. (2018). . 862 . 10.3847\/1538-4357\/aacd4b . 2018ApJ...862..129V , FIFI-LS Observations of the Circumnuclear Ring— Probing the High-density Phase of the PDR . Iserlohe C. et al. . The Astrophysical Journal . null . null . 2019ApJ...885..169I , The Nearby Evolved Stars Survey II: Constructing a volume-limited sample and first results from the James Clerk Maxwell Telescope . Scicluna P. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2022MNRAS.512.1091S , Old supernova dust factory revealed at the Galactic center . Lau R. M. et al. . Science, Volume 348, Issue 6233, pp. 413-418 (2015). . 348 . 10.1126\/science.aaa2208 . 2015Sci...348..413L , A Multi-band Catalog of 10978 Star Clusters, Associations, and Candidates in the Milky Way . Bica Eduardo et al. . The Astronomical Journal, Volume 157, Issue 1, article id. 12, 14 pp. (2019). . 157 . 10.3847\/1538-3881\/aaef8d . 2019AJ....157...12B , Rapid Variability of Sgr A* across the Electromagnetic Spectrum . Witzel G. et al. . The Astrophysical Journal . null . null . 2021ApJ...917...73W , |
| Instrument | PACS_PacsPhoto_largeScan |
| Temporal Coverage | 2012-03-13T05:13:26Z/2012-03-21T12:58:15Z |
| 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 | 2012-09-21T05:06:28Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, fritz, t., 2012, OT2_tfritz_2, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-u868v35 |