2016A&A...592A..27C


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.03CEST02:01:20

2016A&A...592A..27C - Astronomy and Astrophysics, volume 592A, 27-27 (2016/8-1)

Anatomy of the AGN in NGC 5548. VIII. XMM-Newton's EPIC detailed view of an unexpected variable multilayer absorber.

CAPPI M., DE MARCO B., PONTI G., URSINI F., PETRUCCI P.-O., BIANCHI S., KAASTRA J.S., KRISS G.A., MEHDIPOUR M., WHEWELL M., ARAV N., BEHAR E., BOISSAY R., BRANDUARDI-RAYMONT G., COSTANTINI E., EBRERO J., DI GESU L., HARRISON F.A., KASPI S., MATT G., PALTANI S., PETERSON B.M., STEENBRUGGE K.C. and WALTON D.J.

Abstract (from CDS):

In 2013, we conducted a large multi-wavelength campaign on the archetypical Seyfert 1 galaxy NGC 5548. Unexpectedly, this usually unobscured source appeared strongly absorbed in the soft X-rays during the entire campaign, and signatures of new and strong outflows were present in the almost simultaneous UV HST/COS data. Here we carry out a comprehensive spectral analysis of all available XMM-Newton observations of NGC 5548 (precisely 14 observations from our campaign plus three from the archive, for a total of ∼763ks) in combination with three simultaneous NuSTAR observations. We obtain a best-fit underlying continuum model composed by i) a weakly varying flat (Γ∼1.5-1.7) power-law component; ii) a constant, cold reflection (FeK + continuum) component; iii) a soft excess, possibly owing to thermal Comptonization; and iv) a constant, ionized scattered emission-line dominated component. Our main findings are that, during the 2013 campaign, the first three of these components appear to be partially covered by a heavy and variable obscurer that is located along the line of sight (LOS), which is consistent with a multilayer of cold and mildly ionized gas. We characterize in detail the short timescale (mostly ∼ks-to-days) spectral variability of this new obscurer, and find it is mostly due to a combination of column density and covering factor variations, on top of intrinsic power-law (flux and slope) variations. In addition, our best-fit spectrum is left with several (but marginal) absorption features at rest-frame energies ∼6.7-6.9keV and ∼8keV, aswell as a weak broad emission line feature redwards of the 6.4keV emission line. These could indicate a more complex underlying model, e.g. a P-Cygni-type emission profile if we allow for a large velocity and wide-angle outflow. These findings are consistent with a picture where the obscurer represents the manifestation along the LOS of a multilayer of gas, which is also in multiphase, and which is likely outflowing at high speed, and simultaneously producing heavy obscuration and scattering in the X-rays, as well as broad absorption features in the UV.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: active - X-rays: galaxies - galaxies: individual: NGC 5548

Status at CDS:  

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 985 Sy1 02 34 37.882 -08 47 17.02   14.64 14.28 12.9   ~ 344 0
2 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1514 2
3 2MASX J05580206-3820043 Sy1 05 58 02.0566732230 -38 20 04.453517461   16.05 14.98 11.6   ~ 201 1
4 NGC 3227 GiP 10 23 30.57 +19 51 54.3   12.61 11.79     ~ 1525 2
5 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3368 2
6 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1178 2
7 ESO 323-77 Sy2 13 06 26.1213873662 -40 24 52.594127368   13.58 13.42 12.01   ~ 187 0
8 NGC 5506 AGN 14 13 14.901 -03 12 27.22   15.25 14.38     ~ 986 0
9 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2380 0
10 Mrk 486 Sy1 15 36 38.4013129866 +54 33 33.214684833   15.21 14.78     ~ 248 0
11 ESO 140-43 Sy1 18 44 53.9893682398 -62 21 52.871742814   14.14 14.10 12.94 13.1 ~ 209 0
12 Mrk 509 Sy1 20 44 09.7504131334 -10 43 24.724854084   13.35 13.12 10.7   ~ 1122 0
13 IRAS 21262+5643 Sy1 21 27 45.3943647524 +56 56 34.913660916       16.6   ~ 127 0
14 NGC 7582 GiP 23 18 23.621 -42 22 14.06 11.62 10.92 10.62     ~ 793 2

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2020.06.03-02:01:20

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