2007A&A...461..121C


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.12CEST02:22:15

2007A&A...461..121C - Astronomy and Astrophysics, volume 461, 121-134 (2007/1-1)

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

COSTANTINI E., KAASTRA J.S., ARAV N., KRISS G.A., STEENBRUGGE K.C., GABEL J.R., VERBUNT F., BEHAR E., GASKELL C.M., KORISTA K.T., PROGA D., KIM-QUIJANO J., SCOTT J.E., KLIMEK E.S. and HEDRICK C.H.

Abstract (from CDS):

We present a Chandra-LETGS observation of the Seyfert 1 galaxy Mrk 279. This observation was simultaneous with HST-STIS and FUSE observations, in the context of a multiwavelength study of this source. The Chandra pointings were spread over ten days for a total exposure time of ∼360ks. The maximal continuum flux variation is of the order of 30%. The spectrum of Mrk 279 shows evidence of broad emission features, especially at the wavelength of the Ovii triplet. We quantitatively explore the possibility that this emission is produced in the broad line region (BLR). We modeled the broad UV emission lines seen in the FUSE and HST-STIS spectra following the ``locally optimally emitting cloud'' approach. This method considers the emission from BLR as arising from ``clouds'' with a wide range of densities and distances from the source. We find that the X-ray lines luminosity derived from the best fit BLR model match the observed X-ray features, suggesting that the gas producing the UV lines is sufficient to account for the X-ray emission. The spectrum is absorbed by ionized gas whose total column density is ∼5x1020cm–2. The absorption spectrum can be modeled by two distinct gas components (logξ∼0.47 and 2.49, respectively) both showing a significant outflow velocity. However, the data also allow for the presence of intermediate ionization components. The distribution of the column densities of such extra components as a function of the ionization parameter is not consistent with a continuous, power-law like, absorber, suggesting a complex structure for the gas outflow for Mrk 279.

Abstract Copyright:

Journal keyword(s): galaxies: individual: Mrk 279 - quasars: absorption lines - quasars: emission lines - quasars: general - X-rays: galaxies

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4191 2
2 Mrk 3 Sy2 06 15 36.458 +71 02 15.24 14.21 14.03 12.97     ~ 862 3
3 NGC 3516 Sy1 11 06 47.4596406816 +72 34 07.189563769   13.12 12.40     ~ 1439 0
4 NGC 3783 Sy1 11 39 01.7095761008 -37 44 19.008597647   12.46 13.43 11.33 12.1 ~ 1501 0
5 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 2034 1
6 Mrk 279 Sy1 13 53 03.4356451470 +69 18 29.410672989   15.15 14.46     ~ 707 0
7 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2451 0

    Equat.    Gal    SGal    Ecl

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2021.04.12-02:22:15

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