The state of the molecular gas in a luminous starburst/Seyfert 2 galaxy: NGC 1068 revisited

Padeli. P. Papadopoulos; E. R. Seaquist

doi:10.1086/307090

paper

The state of the molecular gas in a luminous starburst/Seyfert 2 galaxy: NGC 1068 revisited

arXiv:astro-ph/9901394 · doi:10.1086/307090

Abstract

We present fully sampled ^{12} $C O,^{13} C O J = 2 - 1, 3 - 2 ma p so f t h e inn er$ \sim 1'\times 1' $r e g i o n o f N GC 1068. W eco mbin e t h ese m e a s u r e m e n t s w i t han e x i s t in g in t er f er o m e t r i c ma p o f^{12} C O J = 1 - 0 t ha t in c l u d ess in g l e d i s h d a t aan d t h u sco n t ain s a l l t h e f l ux p r ese n t . T hi s a l l o w s a r e l iab l ees t ima t eo f t h e^{12} C O (J = 3 - 2) / (J = 1 - 0) r a t i o a tt h e hi g h es t an g u l a r r eso l u t i o n c u r r e n tl y p oss ib l e an d t h e u seo f t hi sse n s i t i v e l in er a t i o t o p r o b e t h e p h y s i c a l co n d i t i o n o f t h e m o l ec u l a r g a s . W e a l so p r ese n ttw o m e a s u r e m e n t so f t h e f ain t C^{18} O J = 2 - - 1 e mi ss i o n w hi c h co n f i r m e a r l i er m e a s u r e m e n t so f ahi g h$ C ^{18}O/ ^{13}CO$ intensity ratio in this galaxy. A simple two-phase model for the gas can account for all the observed line ratios if C ^{18}O emission and part of the ^{13}CO emission arise in a dense spatially concentrated component. The ^{12}CO emission originates from a warmer, diffuse gas phase.The dense gas phase contains the bulk of the molecular gas mass while the diffuse phase may not be virialized leading to an overestimate of molecular gas mass when deduced from the luminosity of the ^{12}CO J=1--0 line and a standard galactic conversion factor.

41 pages, 5 figures, to appear in Astrophysical Journal 1999, May 1

The state of the molecular gas in a luminous starburst/Seyfert 2 galaxy: NGC 1068 revisited

Abstract

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