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We simultaneously analyze the spectral line energy distributions (SLEDs) ofCO and H2 of six local luminous infrared (IR) Seyfert galaxies. For the COSLEDs, we used new Herschel/SPIRE FTS data (from J=4-3 to J=13-12) andground-based observations for the lower-J CO transitions. The H2 SLEDs wereconstructed using archival mid-IR Spitzer/IRS and near-IR VLT/SINFONI data forthe rotational and ro-vibrational H2 transitions, respectively. In total, theSLEDs contain 26 transitions with upper level energies between 5 and 15000 K. Asingle, constant density, model (n$_{H_2}$ ~ 10$^{4.5-6}$ cm$^{-3}$) with abroken power-law temperature distribution reproduces well both the CO and H2SLEDs. The power-law indices are $\beta_1$ ~ 1-3 for warm molecular gas (20 K <T < 100 K) and $\beta_2$ ~ 4-5 for hot molecular gas (T > 100 K). We show thatthe steeper temperature distribution (higher $\beta$) for hot molecular gas canbe explained by shocks and photodissociation region (PDR) models, however, theexact $\beta$ values are not reproduced by PDR or shock models alone and acombination of both is needed. We find that the three major mergers among ourtargets have shallower temperature distributions for warm molecular gas thanthe other three spiral galaxies. This can be explained by a higher relativecontribution of shock excitation, with respect to PDR excitation, for the warmmolecular gas in these mergers. For only one of the mergers, IRASF 05189-2524,the shallower H2 temperature distribution differs from that of the spiralgalaxies. The presence of a bright active galactic nucleus in this source mightexplain the warmer molecular gas observed.

Warm molecular gas temperature distribution in six local infrared bright Seyfert galaxies