A dataset provided by the European Space Agency

Name OT2_alopezse_3
Title Mapping the cosmic ray ionisation rate across the Northern end of the Orion A iant molecular cloud
URL

http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342240368&instrument_name=HIFI&product_level=LEVEL0&compress=true
DOI https://doi.org/10.5270/esa-ulwz78w
Author lopez-sepulcre, a.
Description Cosmic rays (CR) are ubiquitous in the Galaxy and have the important role of ionizing the dens gas of the ISM. New Herschel observations have shown the huge diagnostic power of the OH+ fundamental transition to measure the CR ionization rate in diffuse clouds. Based on previous serendipity observations toward OMC2-FIR4 within the KP CHESS, we discovered a tenuous foreground cloud absorbing the fundamental OH+ line. Similarly, Gupta et al. (2010) found an OH+ absorption component at a similar velocity towards Orion KL and estimated a large CR ionization rate more than 10 times larger than the average value observed in diffuse clouds . We propose here to roughly map the CR ionization rate in the direction of the OMC2 and OMC3 complex to understand its extent, nature, and, finally, the source of ionization.
Publication
  • Herschel CHESS discovery of the fossil cloud that gave birth to the Trapezium and Orion KL | Lopez-Sepulcre A. et al. | Astronomy & Astrophysics Volume 549 id.A114 9 pp. | 549 | 10.1051/0004-6361/201219416 | 2013A&A...549A.114L | http://adsabs.harvard.edu/abs/2013A%26A...549A.114L
Instrument HIFI_HifiPoint_dbs
Temporal Coverage 2012-02-22T16:15:13Z/2012-02-22T16:32:15Z
Version SPG v14.1.0
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 2012-08-22T16:15:13Z
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, lopez-sepulcre et al., 2012, 'Mapping the cosmic ray ionisation rate across the Northern end of the Orion A iant molecular cloud', SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-ulwz78w