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12CO(1-0) observations of NGC 4848: a Coma galaxy after stripping | | B. Vollmer
; J. Braine
; C. Balkowski
; V. Cayatte
; W.J. Duschl
; | | Date: |
3 Jul 2001 | | Subject: | astro-ph | | Affiliation: | 1,2), J. Braine , C. Balkowski , V. Cayatte , W.J. Duschl (4,1) ( MPI fuer Radioastronomie, Bonn, Germany, DAEC, Observatoire de Paris, France, Observatoire de Bordeaux, Floirac, France, ITA, Univ. Heidelberg, Germany | | Abstract: | We study the molecular gas content and distribution in the Coma cluster spiral galaxy NGC 4848. Plateau de Bure interferometric CO(1-0) observations reveal a lopsided H_2 distribution with an off-center secondary maximum coincident with the inner part of the HI. NGC 4848 is not at all deficient in molecular gas as it contains M_H_2~4x10^9 M_solar. At the interface between the CO and HI emission regions, about 8 kpc NW of the center, however, strong star formation is present as witnessed by Halpha and radio continuum emission. This is the region in which earlier Fabry-Perot observations revealed a double-peaked Halpha line, indicating gas at two different velocities at the same sky position. In order to understand these observations, we present the results of numerical simulations of the ISM-ICM interaction. We suggest that NGC 4848 already passed through the center of the cluster about 4x10^8 years ago. At the observed stage ram pressure has no more direct dynamical influence on the galaxy’s ISM. We observe the galaxy when a fraction of the stripped gas is falling back onto the galaxy. Ram pressure is thus a short-lived event with longer-lasting consequences. The combination of ram-pressure and rotation results in gas at different velocities colliding where the double-peaked Halpha line is observed. Ram-pressure can thus result, after re-accretion, in displaced molecular gas without the H_2 itself being pushed efficiently by the ICM. A scenario where two interactions take place simultaneously is also consistent with the available data but less probable on the basis of our numerical simulations. | | Source: | arXiv, astro-ph/0107049 | | Services: | Forum | Review | PDF | Favorites | |
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