A dataset provided by the European Space Agency

Name OT2_tgreve_1
Title Probing the Physical Conditions of the Interstellar Medium in High Redshift Radio Galaxies


DOI https://doi.org/10.5270/esa-sgbg99b
Author European Space Agency
Description High redshift radio galaxies (HzRGs) are the most dramatic examples of the
formation of massive galaxies in the early Universe, as evidenced by their
extreme (>1000Msun/yr) star formation rates. At the same time they coincide
with a phase of rapid coeval black hole (BH) growth, as revealed by their powerful
active galactic nuclei (AGN). This makes HzRGs unique laboratories in which to
study the coevolution of massive galaxies and their central BHs. Our
team has successfully carried out comprehensive imaging surveys of 62 powerful
HzRGs at z > 1 using Spitzer and Herschel. These surveys have demonstrated that
HzRGs have high stellar masses (>1e11Msun), and mid-IR AGN luminosities
comparable to the most powerful QSOs known. Also, they have allowed us
to separate the AGN and starburst contributions to the total IR luminosity. In
parallel to this, we are undertaking a large CO(1-0) line survey towards a
subset of 10 HzRGs using ATCA, which will provide us with
excitation-unbiased mass estimates of the total molecular gas
available for star formation. With this proposal we will constrain the bulk
physical conditions of the star forming gas in HzRGs using the far-infrared OI
fine-structure line at 63micron, which is one of the brightest diagnostic lines
of the interstellar medium (ISM) in galaxies. The [OI] line, which can contain
as much as >0.1% of the total IR luminosity of a galaxy, is one of the major
coolants of the ISM, and is expected to be particular bright in the type of
dense, hot, star forming gas expected to dominate the ISM in HzRGs. Utilizing
our accurate IR luminosity estimates and molecular gas masses in combination
with [OI] we will employ photo-dissociation models to constrain the gas density
and the impinging FUV radiation field. We request a total of 13.1hrs of PACS
spec...troscopy (virgul2.2hrs per source, ensuring a S/N > 5) in order to detect the
[OI] line towards six carefully chosen HzRG, representative of the luminous 1 <
z < 2.3 radio galaxy population.
Instrument PACS_PacsRangeSpec_point
Temporal Coverage 2013-04-28T03:45:48Z/2013-04-28T05:54:11Z
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 2013-10-28T03:45:48Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013, Probing The Physical Conditions Of The Interstellar Medium In High Redshift Radio Galaxies, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-sgbg99b