2015A&A...579A..42D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST23:20:08

2015A&A...579A..42D - Astronomy and Astrophysics, volume 579A, 42-42 (2015/7-1)

Anatomy of the AGN in NGC 5548. IV. The short-term variability of the outflows.

DI GESU L., COSTANTINI E., EBRERO J., MEHDIPOUR M., KAASTRA J.S., URSINI F., PETRUCCI P.O., CAPPI M., KRISS G.A., BIANCHI S., BRANDUARDI-RAYMONT G., DE MARCO B., DE ROSA A., KASPI S., PALTANI S., PINTO C., PONTI G., STEENBRUGGE K.C. and WHEWELL M.

Abstract (from CDS):

During an extensive multiwavelength campaign that we performed in 2013-2014, we found the prototypical Seyfert 1 galaxy NGC 5548 in an unusual condition of heavy and persistent obscuration. The newly discovered ``obscurer'' absorbs most of the soft X-ray continuum along our line of sight and lowers the ionizing luminosity received by the classical warm absorber. We present the analysis of the high resolution X-ray spectra collected with XMM-Newton and Chandra throughout the campaign, which are suitable to investigate the variability of both the obscurer and classical warm absorber. The time separation between these X-ray observations range from two days to eight months. On these timescales the obscurer is variable both in column density and in covering fraction. This is consistent with the picture of a patchy wind. The most significant variation occurred in September 2013 when the source brightened for two weeks. A higher and steeper intrinsic continuum and a lower obscurer covering fraction are both required to explain the spectral shape during the flare. We suggest that a geometrical change of the soft X-ray source behind the obscurer causes the observed drop in the covering fraction. Because of the higher soft X-ray continuum level, the September 2013 Chandra spectrum is the only X ray spectrum of the campaign in which individual features of the warm absorber could be detected. The spectrum shows absorption from Fe-UTA, OIV, and OV, consistent with belonging to the lower-ionization counterpart of the historical NGC 5548 warm absorber. Hence, we confirm that the warm absorber has responded to the drop in the ionizing luminosity caused by the obscurer.

Abstract Copyright:

Journal keyword(s): Galaxy: abundances - quasars: absorption lines - X-rays: galaxies

Simbad objects: 16

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Number of rows : 16

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 Mrk 335 Sy1 00 06 19.5371542746 +20 12 10.617456059   14.19 13.85     ~ 1091 0
2 NGC 454 PaG 01 14 22.93 -55 23 55.4   14.26       ~ 49 1
3 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1523 2
4 LB 1727 Sy1 04 26 00.7188445954 -57 12 01.772037544 13.68 14.58 14.37 14.8   ~ 235 0
5 2MASX J05580206-3820043 Sy1 05 58 02.0566732230 -38 20 04.453517461   16.05 14.98 11.6   ~ 202 1
6 Mrk 1210 Sy2 08 04 05.8618852704 +05 06 49.810938210   14.55 13.7     ~ 259 2
7 NGC 3783 Sy1 11 39 01.7095761008 -37 44 19.008597647   12.46 13.43 11.33 12.1 ~ 1486 0
8 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 1991 1
9 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3379 2
10 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1183 2
11 IC 4271 Sy2 13 29 21.441 +37 24 50.45   15.6       ~ 120 1
12 Mrk 279 Sy1 13 53 03.4356451470 +69 18 29.410672989   15.15 14.46     ~ 693 0
13 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2391 0
14 Mrk 841 Sy1 15 04 01.1935077982 +10 26 15.778741853   14.50 14.27     ~ 583 0
15 Mrk 509 Sy1 20 44 09.7504131334 -10 43 24.724854084   13.35 13.12 10.7   ~ 1128 0
16 NGC 7582 GiP 23 18 23.621 -42 22 14.06 11.62 10.92 10.62     ~ 796 2

    Equat.    Gal    SGal    Ecl

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2020.07.03-23:20:08

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