Molecular Gas in the Merging System ARP 299 |
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| Authors: | M-C Willaime F Casoli M Gerin |
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| Institution: | (1) Observatoire de Paris, DEMIRM, 61 av. de l'Observatoire, 75014 Paris, France |
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| Abstract: | We present new observations of the molecular gas distribution in the merging system Arp 299. The first observation set was
obtained with the Canada–France–Hawaii Telescope near-IR camera Redeye and the second set comes from the IRAM Plateau de Bure
interferometer (combined with short spacings observed at the IRAM 30 m Telescope). In the near IR, H2 ν=1→0 S(1) and Brγ line maps are globally identical: there is bright emission not only at the two galaxy nuclei but also in numerous extranuclear
star forming regions. Moreover, there is weaker emission localized in filaments between and around the two nuclei. These filaments
correspond to a dust lane observed in optical images from HST. 12CO(1→0), 13CO(1→0) and HCN(1→0) maps are also presented. The structure of the12CO(1→0) map is very close to the NIR observations: the same bright galaxy nuclei and star-forming regions, the same filaments,
but half of the total flux is found in weak extended emission. Strong HCN emission is observed in the nucleus A indicating
the presence of a large amount of dense gas. Nucleus B1 is weak in 12CO(1→0) emission while nucleus A and star-forming regions C-C′ show more normal 13CO/12CO ratios.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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