A dataset provided by the European Space Agency

Name OT2_smalhotr_3
Title Herschel Extreme Lensing Line Observations (HELLO)
URL

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DOI https://doi.org/10.5270/esa-7cmu0cf
Author malhotra, s.
Description We request 59.8 hours of Herschel time to observe 20 normal star-forming galaxies in the [CII] 158 micron and [OI] 63 micron lines. These galaxies lie at high redshift (1<z<3). They are highly magnified by gravitational lensing, but have modest star formation rates. Therefore they represent our best chance of studying star formation and the interstellar medium in typical, common galaxies at this epoch. Redshift 1 to 3 spans the peak of both star formation activity and black hole accretion in active galactic nuclei-- a period that was crucial in shaping our modern universe. Most of this redshift range is inaccesible to ground-based observations of [CII], [OI], or both. Herschel offers the unique opportunity to study both lines with high sensitivity throughout this epoch (using HIFI for [CII] and PACS for [OI]). These two lines are the main cooling lines of the atomic medium. By measuring their fluxes, we will measure (1) the cooling efficiency of gas, (2) gas densities and temperatures near starforming regions, and (3) gas pressures, which are important to drive the winds that provide feedback to starformation processes. By combining the proposed observations with existing multiwavelength data on these objects, we will obtain as complete a picture of galaxy-scale star formation and ISM physical conditions at high redshifts as we have at z=0. Then perhaps we can understand why star formation and AGN activity peaked at this epoch. In Herschel cycle OT1, 49 high redshift IR luminous galaxies were approved for spectroscopy, but only two so-called normal galaxies were included. This is an imbalance that should be corrected, to balance Herschel.s legacy.
Publication Herschel Extreme Lensing Line Observations: Dynamics of Two Strongly Lensed Star-forming Galaxies near Redshift z = 2 . Rhoads James E. et al. . The Astrophysical Journal, Volume 787, Issue 1, article id. 8, 7 pp. (2014). . 787 . 10.1088/0004-637X/787/1/8 . 2014ApJ...787....8R ,
Herschel Extreme Lensing Line Observations: [CII] Variations in Galaxies at Redshifts z=1-3 . Malhotra Sangeeta et al. . The Astrophysical Journal, Volume 835, Issue 1, article id. 110, 9 pp. (2017). . 835 . 10.3847/1538-4357/835/1/110 . 2017ApJ...835..110M ,
Instrument HIFI_HifiPoint_dbs, PACS_PacsPhoto_largeScan, SPIRE_SpirePhoto_small, PACS_PacsLineSpec_large
Temporal Coverage 2012-05-03T02:46:53Z/2013-01-07T05:07:22Z
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 2013-07-07T01:48:06Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013, OT2_smalhotr_3, SPG v14.2.0. https://doi.org/10.5270/esa-7cmu0cf