|Shocked molecular and atomic gas in the Spiderweb radio galaxy at z=2.156
|PACS spectroscopy of the Spiderweb radio galaxy (PKS 1138-26) at redshift z=2.156 will be used to study jet-shocked molecular and atomic gas in a rapidly evolving protocluster central galaxy. This will lead to a better understanding of the impact of AGN feedback on the evolution of massive elliptical galaxies in general. We have detected extremely luminous (7E10 Lsun) H2 0-0 S(3) emission in a deep Spitzer IRS spectroscopic map. This is by far (a factor of 50) the most luminous known molecular hydrogen emission galaxy. We estimate that there must be &amp;gt;1E7 Msun of warm (T=650 K) molecular gas heated by dissipation of kinetic energy from the relativistic radio jet. PACS spectroscopy of the H2 0-0 S(0) line will enable us to measure the mass of warm H2 at lower temperature (T=100-500) K, which likely constitutes the bulk of the shocked molecular gas, possibly &amp;gt;1E11 solar masses. We have also detected ultraluminous PAH emission indicating a star formation rate of 1000 Msun-yr. PACS spectroscopy of the [Si II] 35 micron and [O I] 63 micron cooling lines will provide additional diagnostics of the shocked neutral medium, including distinguishing between magnetic and nonmagnetic shocks, and assessing the kinematics of this important ISM component in a massive elliptical galaxy under construction.
|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.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2013, OT2_pogle01_2, SPG v14.2.0. https://doi.org/10.5270/esa-duoqvx3