dc.creatorSCARANO JR., S.
dc.creatorMADSEN, Felipe R. H.
dc.creatorROY, Nirupam
dc.creatorLEPINE, J. R. D.
dc.date.accessioned2012-10-20T02:12:24Z
dc.date.accessioned2018-07-04T15:29:56Z
dc.date.available2012-10-20T02:12:24Z
dc.date.available2018-07-04T15:29:56Z
dc.date.created2012-10-20T02:12:24Z
dc.date.issued2008
dc.identifierMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, v.386, n.2, p.963-972, 2008
dc.identifier0035-8711
dc.identifierhttp://producao.usp.br/handle/BDPI/27033
dc.identifier10.1111/j.1365-2966.2008.13079.x
dc.identifierhttp://dx.doi.org/10.1111/j.1365-2966.2008.13079.x
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1623683
dc.description.abstractNGC 6908, an S0 galaxy situated in the direction of NGC 6907, was only recently recognized as a distinct galaxy, instead of only a part of NGC 6907. We present 21-cm radio synthesis observations obtained with the Giant Metrewave Radio Telescope (GMRT) and optical images and spectroscopy obtained with the Gemini-North telescope of this pair of interacting galaxies. From the radio observations, we obtained the velocity field and the H I column density map of the whole region containing the NGC 6907/8 pair, and by means of the Gemini multi-object spectroscopy we obtained high-quality photometric images and 5 angstrom resolution spectra sampling the two galaxies. By comparing the rotation curve of NGC 6907 obtained from the two opposite sides around the main kinematic axis, we were able to distinguish the normal rotational velocity field from the velocity components produced by the interaction between the two galaxies. Taking into account the rotational velocity of NGC 6907 and the velocity derived from the absorption lines for NGC 6908, we verified that the relative velocity between these systems is lower than 60 km s(-1). The emission lines observed in the direction of NGC 6908, not typical of S0 galaxies, have the same velocity expected for the NGC 6907 rotation curve. Some emission lines are superimposed on a broader absorption profile, which suggests that they were not formed in NGC 6908. Finally, the H I profile exhibits details of the interaction, showing three components: one for NGC 6908, another for the excited gas in the NGC 6907 disc and a last one for the gas with higher relative velocities left behind NGC 6908 by dynamical friction, used to estimate the time when the interaction started in (3.4 +/- 0.6) x 10(7) yr ago.
dc.languageeng
dc.publisherBLACKWELL PUBLISHING
dc.relationMonthly Notices of the Royal Astronomical Society
dc.rightsCopyright BLACKWELL PUBLISHING
dc.rightsrestrictedAccess
dc.subjectgalaxies
dc.subjectinteractions
dc.subjectgalaxies
dc.subjectkinematics and dynamics
dc.subjectgalaxies
dc.subjectphotometry
dc.subjectradio lines
dc.subjectgalaxies
dc.titleHI aperture synthesis and optical observations of the pair of galaxies NGC 6907 and 6908
dc.typeArtículos de revistas


Este ítem pertenece a la siguiente institución