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We present 168 arcmin^2 spectral images of the Sgr B2 complex taken withHerschel/SPIRE-FTS. We detect ubiquitous emission from CO (up to J=12-11), H2O,[CI]492, 809 GHz, and [NII] 205 um lines. We also present maps of the SiO,N2H+, HCN, and HCO+ emission obtained with the IRAM30m telescope. The cloudenvironment dominates the emitted FIR (80%), H2O 752 GHz (60 %) mid-J CO (91%),and [CI] (93 %) luminosity. The region shows very extended [NII] emission(spatially correlated with the 24 and 70 um dust emission). The observed FIRluminosities imply G_0~10^3. The extended [CI] emission arises from a pervasivecomponent of neutral gas with n_H~10^3 cm-3. The high ionization rates,produced by enhanced cosmic-ray (CR) fluxes, drive the gas heating to Tk~40-60K. The mid-J CO emission arises from a similarly extended but more pressurizedgas component (P_th~10^7 K cm-3). Specific regions of enhanced SiO emission andhigh CO-to-FIR intensity ratios (>10^-3) show mid-J CO emission compatible withshock models. A major difference compared to more quiescent star-forming cloudsin the disk of our Galaxy is the extended nature of the SiO and N2H+ emissionin Sgr B2. This can be explained by the presence of cloud-scale shocks, inducedby cloud-cloud collisions and stellar feedback, and the much higher CRionization rate (>10^-15 s-1) leading to overabundant H3+ and N2H+. Hence, SgrB2 hosts a more extreme environment than star-forming regions in the disk ofthe Galaxy. As a usual template for extragalactic comparisons, Sgr B2 showsmore similarities to ultra luminous infrared galaxies such as Arp 220,including a "deficit" in the [CI]/FIR and [NII]/FIR intensity ratios, than topure starburst galaxies such as M82. However, it is the extended cloudenvironment, rather than the cores, that serves as a useful template whentelescopes do not resolve such extended regions in galaxies.

Submillimeter imaging of the Galactic Center starburst Sgr B2. Warm molecular, atomic, and ionized gas far from massive star-forming cores