PACS observations of the CII 158 micron emission line are proposed for 56 luminous, dusty galaxies to determine if there are starbursts so obscured by dust that the starbursts are weak or invisible in the mid-infrared PAH features observed with the Spitzer Infrared Spectrograph (IRS). Are there LIRGs and ULIRGs classified as AGN which really are heavily obscured starbursts? Because of the much smaller extinction affecting the CII feature, large f(CII)/f(PAH) ratios would show the presence of such obscured starbursts. Sources proposed include 18 pure starbursts to improve the f(CII)/f(PAH) calibration for these, 32 sources classified as AGN/starburst composites, and 6 sources with weak PAH and very strong silicate absorption. This proposal builds on the success of our OT1 program for which a summary is given of the excellent CII detections so far obtained and analyzed for a variety of luminous sources with IRS starburst/AGN classifications.
Publication
Star Formation Rates from C II 158 mm and Mid-infrared Emission Lines for Starbursts and Active Galactic Nuclei | Sargsyan L. et al. | The Astrophysical Journal Volume 790 Issue 1 article id. 15 12 pp. (2014). | 790 | 10.1088/0004-637X/790/1/15 | 2014ApJ...790...15S | http://adsabs.harvard.edu/abs/2014ApJ...790...15S
Instrument
PACS_PacsLineSpec_point
Temporal Coverage
2012-09-15T19:35:50Z/2013-04-28T06:37:23Z
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.
European Space Agency, sargsyan et al., 2013, 'Seeking Obscured Starbursts of High Luminosity with PACS Measures of [CII]', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-87nhx21
