| Name | OT2_hshim_2 |
| Title | Merger driven vs. Cold-flow driven Star Formation in Typical High-redshift Galaxies: CII Line Observation of Local Analogs of High-redshift Galaxies |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342251515&instrument_name=PACS&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-gsw1416 |
| Author | shim, h. |
| Description | One of the biggest challenges in galaxy evolution is to understand how star formation ispowered in high-redshift star-forming galaxies. Recent discovery of unusually strong(EW > 500A) Halpha emission in majority of z>4 star-forming galaxies has providedindirect evidence that significant fraction of high-redshift star formation is fueled bymechanisms other than gas-rich merger, suggesting that cold gas accretion is an importantsource of cold, neutral gas in high-redshift galaxies. FIR cooling lines such asCII 158 micron line, produced by the UV stellar radiation like Halpha, affordan efficient probe to study physical properties of the interstellar medium in star-forminggalaxies. Therefore, we propose to observe CII emission line from local counterpartsof high-redshift strong Halpha Emitters to investigate the properties of cold neutralgas in these galaxies and understand how star formation is powered. We request total11.1 hours of Herschel/PACS observation using Line Spectroscopy AOT for 20 targets,detecting the expected CII line with line S/N of >3. Unlike the IR-luminous galaxiesor QSOs, HAEs are typical star-forming galaxies at high redshifts thus CII observationof local HAEs would provide the first measurement of CII and CII/FIR ratio oftypical high-redshift star-forming galaxies. Thanks to the existing data includingspectroscopy, the relationship between the observed CII and Halpha, FIR luminositycan be investigated as a function of metallicity, stellar population, extinction, etc.Such relationship would be able to tell whether CII/FIR ratio can be used as an indicatorthat discriminates merger-driven star formation and cold-flow driven star formation. Usingthe last opportunity of Herschel to access rest-frame FIR cooling lines of local galaxies,this observing program would provide a detailed physical framework for interpretation offuture large CII surveys in galaxies at higher redshifts using existing or plannedsubmm to radio facilities. |
| Publication | |
| Instrument | PACS_PacsLineSpec_point |
| Temporal Coverage | 2012-09-26T19:26:17Z/2013-03-10T17:03:36Z |
| 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 | 2013-09-10T16:50:22Z |
| Last Update | 2026-03-02 |
| Keywords | Herschel Space Observatory data, ESA Herschel mission dataset, far-infrared astronomy observations, submillimeter astronomy data, infrared space telescope observations, PACS photometer data, PACS spectrometer data, SPIRE photometer data, SPIRE Fourier transform spectrometer data, HIFI heterodyne spectroscopy data, far-infrared spectroscopy dataset, submillimeter spectral line observations, cold universe observations dataset, star formation infrared data, molecular cloud far-infrared observations, interstellar medium spectroscopy data, protoplanetary disk infrared observations, galaxy evolution far-infrared data, dust emission submillimeter observations, cosmic infrared background measurements, extragalactic infrared survey data, calibrated level 2 data products, FITS files astronomy, spectral cubes far-infrared, flux-calibrated maps, continuum photometry data, spectral energy distribution measurements, ESA Herschel Science Archive data |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, shim et al., 2013, 'Merger driven vs. Cold-flow driven Star Formation in Typical High-redshift Galaxies: [CII] Line Observation of Local Analogs of High-redshift Galaxies', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-gsw1416 |