| Name | OT2_dfisher_1 |
| Title | The Dust Mass of the Extremely Metal Poor Galaxy I Zw 18: Imaging at 100 and 160 microns |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342245936&instrument_name=PACS&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-4w5cdcy |
| Author | fisher, d. |
| Description | We will use PACS scan maps to measure the 100 and 160 micron flux of I Zw 18, the lowest metallicity galaxy within 20 Mpc. I Zw 18 offers a nearby window into to the processes which make stars in the primitive galaxies observed in the high redshift Universe. We will measure the dust mass of I Zw 18, and combine this with data already in hand to determine its dust-to-gas ratio, yielding *the* crucial measurement to establish how dust-to-gas ratio relates to metallicity in galaxies. Measuring the dust mas of I Zw 18 requires to accurately constraint of the long wavelength side of the dust infrared spectral energy distribution. Existing data has proven unsuccessful at detecting this galaxy longwards of 70 um. Our observations are designed to detect I Zw 18 at 100 um and either detect it or yield a strong constraint at 160 um. With a very modest time investment (under 5 hours) these measurements will determine whether the dust-to-gas ratio is linear or superlinear with metallicity. Because the dust-to-gas ratio is related to the formation and destruction of molecules and the heating of the ISM, this is a key measurement to understand the impact of metallicity on the evolution of galaxies. |
| Publication |
|
| Instrument | PACS_PacsPhoto_largeScan |
| Temporal Coverage | 2012-05-20T19:42:29Z/2012-05-21T00:15:35Z |
| 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 | 2012-11-20T21:53:38Z |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, fisher et al., 2012, 'The Dust Mass of the Extremely Metal Poor Galaxy I Zw 18: Imaging at 100 and 160 microns', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-4w5cdcy |