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We present a Chandra-LETGS observation of the Seyfert 1 galaxy Mrk 279. Thisobservation was carried out simultaneously with HST-STIS and FUSE, in thecontext of a multiwavelength study of this source. The Chandra pointings werespread over ten days for a total exposure time of ~360 ks. The spectrum ofMrk279 shows evidence of broad emission features, especially at the wavelengthof the OVII triplet. We quantitatively explore the possibility that thisemission is produced in the broad line region (BLR). We modeled the broad UVemission lines seen in the FUSE and HST-STIS spectra following the ``locallyoptimally emitting cloud" approach. We find that the X-ray lines luminosityderived from the best fit BLR model can match the X-ray features, suggestingthat the gas producing the UV lines is sufficient to account also for the X-rayemission. The spectrum is absorbed by ionized gas whose total column density is~5x10^{20} cm^{-2}. The absorption spectrum can be modeled by two distinct gascomponents (log xi ~ 0.47 and 2.49, respectively) both showing a significantoutflow velocity. However, the data allow also the presence of intermediateionization components. The distribution of the column densities of such extracomponents as a function of the ionization parameter is not consistent with acontinuous, power law-like, absorber, suggesting a complex structure for thegas outflow for Mrk 279 (abridged).Comment: 16 pages, 12 figures. To appear in A&

astronomy and astrophysics

X-ray/ultraviolet observing campaign of the Markarian 279 active galactic nucleus outflow: a close look at the absorbing/emitting gas with <i>Chandra</i>-LETGS

X-ray/ultraviolet observing campaign of the Markarian 279 active galactic nucleus outflow: a close look at the absorbing/emitting gas with Chandra-LETGS