ROSAT evidence for AGN and superwind activity in NGC 6240 and NGC 2782

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dc.creatorSchulz, Hartmut
dc.creatorKomossa, Stefanie
dc.creatorBerghoefer, Thomas W.
dc.creatorBoer, Berto
dc.date1997-10-09
dc.date.accessioned2026-07-07T02:24:30Z
dc.date.available2026-07-07T02:24:30Z
dc.descriptionWe present ROSAT observations of the starburst galaxy NGC 2782 (HRI plus a weak PSPC frame) and the ultraluminous infrared galaxy NGC 6240 (PSPC). The (0.1-2.4) keV spectra of both objects appear similar. However, due to better sampling spectral modeling is only warranted in case of NGC 6240 for which both a single thermal Raymond-Smith model (kT = 0.44) or a hybrid model consisting of 80% power-law with the canonical photon index -1.9 plus 20% Raymond-Smith contribution (kT = 0.63) lead to good fits. However, the single thermal model turns out to be unlikely because it yields a luminosity of 3.8 10^{43} erg/s, which is hard to reach in a starburst superwind-scenario. The hybrid model leads to a more moderate luminosity of 5.2 10^{42} erg/s, of which 1.0 10^{42} erg/s can be attributed to shocked superwind gas. We link the remaining 4.2 10^{42} erg/s powerlaw to an AGN component because the alternative of inverse-compton scattering of the FIR radiation leads to a too low flux when estimated with available data. The result appears to be consistent with preliminarily announced ASCA observations. For NGC 2782 we find L_x = 4 10^{41} erg/s which can be explained by emission from a shocked superwind region with a high preshock density in agreement with earlier optical evidence for an outflowing supershell.
dc.description10 pages incl. 6 figures, to appear in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9710098
dc.identifierhttp://arxiv.org/abs/astro-ph/9710098
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11630
dc.subjectAstrophysics
dc.titleROSAT evidence for AGN and superwind activity in NGC 6240 and NGC 2782
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