A dataset provided by the European Space Agency

Name OT2_smadde01_5
Title Star Formation and ISM properties in the lowest metal-poor galaxies observed by Herschel
URL

http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342248295&instrument_name=PACS&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342249197&instrument_name=PACS&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342253757&instrument_name=PACS&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342253758&instrument_name=PACS&product_level=LEVEL0&compress=true
DOI https://doi.org/10.5270/esa-o2i73on
Author madden, s.
Description A remarkable result to date is our recent SHINING detection of the CII line with PACS in the ultra-metal-poor galaxies: IZw18 and SBS0335-052 (1/40th and 1/50 solar metallicity) giving us the best opportunity to study the star formation and ISM properties under the most extreme metal-poor conditions we have in our local universe - conditionssimilar to primordial ISM at very high redshift. SBS0335-052 and IZw18 are the most metal-poor galaxies that will ever beobserved by Herschel. In spite of similar metallicities, the 2 galaxies are very different in star formation rates and MIR and FIR luminosities, suggesting that metallicity is not the most important parameter controlling star formation activity. We ask here for complementary OI 63 mu m and OIII 88 mu m observations to be ableto interpret the CII detection in terms of ionised and neutral gas properties. These galaxies are not detected in CO and we believe that the CII is probing the molecular gas not traced by CO - the .dark molecular gas. which could be a significant reservoir of fuel for the star formation in low metallicity galaxies. Our CII observations along with these followup lines, can provide a means to unveil this suspected reservoir of CO-free molecular gas. The CII detection along with these 10.2h of observations requested in this proposa, will shed unique, new insight on extremely low metallicity conditions for star formation and also help provide a standard calibration for getting a handle at the molecular gas reservoir in the high redshift lowest metallicity galaxies which will be a focus for ALMA studies.
Publication
  • The applicability of far-infrared fine-structure lines as star formation rate tracers over wide ranges of metallicities and galaxy types | De Looze Ilse et al. | Astronomy & Astrophysics Volume 568 id.A62 34 pp. | 568 | 10.1051\\/0004-6361\\/201322489 | 2014A&A...568A..62D | http://adsabs.harvard.edu/abs/2014A%26A...568A..62D
  • Diversity of dwarf galaxy IR-submm emission patterns: CLUES from hydrodynamical simulations | Santos-Santos Isabel M. E. et al. | Astronomy & Astrophysics Volume 603 id.A4 22 pp. | 603 | 10.1051\\/0004-6361\\/201629426 | 2017A&A...603A...4S | http://adsabs.harvard.edu/abs/2017A%26A...603A...4S
  • The Herschel Dwarf Galaxy Survey. I. Properties of the low-metallicity ISM from PACS spectroscopy | Cormier D. et al. | Astronomy & Astrophysics Volume 578 id.A53 53 pp. | 578 | 10.1051\\/0004-6361\\/201425207 | 2015A&A...578A..53C | http://adsabs.harvard.edu/abs/2015A%26A...578A..53C
  • Tracing the total molecular gas in galaxies: CII and the CO-dark gas | Madden S. C. et al. | Astronomy and Astrophysics | null | null | 2020A&A...643A.141M |
  • The Herschel Dwarf Galaxy Survey. II. Physical conditions, origin of C II emission, and porosity of the multiphase low-metallicity ISM | Cormier D. et al. | Astronomy and Astrophysics | null | null | 2019A&A...626A..23C |
  • Inferring the HII region escape fraction of ionizing photons from infrared emission lines in metal-poor star-forming dwarf galaxies | Ramambason L. et al. | Astronomy and Astrophysics | null | null | 2022A&A...667A..35R |
Instrument PACS_PacsLineSpec_point
Temporal Coverage 2012-07-16T05:03:54Z/2012-10-22T01:26:24Z
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 2013-04-22T00:15:31Z
Keywords Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, madden et al., 2013, 'Star Formation and ISM properties in the lowest metal-poor galaxies observed by Herschel', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-o2i73on