2018A&A...616A.170A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST18:25:34

2018A&A...616A.170A - Astronomy and Astrophysics, volume 616A, 170-170 (2018/8-1)

X-ray absorption towards high-redshift sources: probing the intergalactic medium with blazars.

ARCODIA R., CAMPANA S., SALVATERRA R. and GHISELLINI G.

Abstract (from CDS):

The role played by the intergalactic medium (IGM) in the X-ray absorption towards high-redshift sources has recently drawn more attention in spectral analysis studies. Here, we study the X-ray absorption towards 15 flat-spectrum radio quasars at z>2, relying on high counting statistic (≥10000 photons) provided by XMM-Newton, with additional NuSTAR (and simultaneous Swift-XRT) observations when available. Blazars can be confidently considered to have negligible X-ray absorption along the line of sight within the host galaxy, likely swept by the kpc-scale relativistic jet. This makes our sources ideal for testing the absorption component along the IGM. Our new approach is to revisit the origin of the soft X-ray spectral hardening observed in high-z blazars in terms of X-ray absorption occurring along the IGM, with the help of a low-z sample used as comparison. We have verified that the presence of absorption in excess of the Galactic value is the preferred explanation to explain the observed hardening, while intrinsic energy breaks, predicted by blazars' emission models, can easily occur out of the observing energy band in most sources. First, we performed an indirect analysis comparing the inferred amount of absorption in excess of the Galactic value with a simulated IGM absorption contribution, that increases with redshift and includes both a minimum component from diffuse IGM metals, and the additional contribution of discrete denser intervening regions. Then, we directly investigated the warm-hot IGM with a spectral model on the best candidates of our sample, obtaining an average IGM density of n0=1.01–0.72+0.53x10–7cm–3 and temperature of log(T/K)=6.45–2.12+0.51. A more dedicated study is currently beyond our reach, but our results can be used as a stepping stone for future more accurate analysis, involving Athena.

Abstract Copyright: © ESO 2018

Journal keyword(s): X-rays: general - quasars: general - intergalactic medium - galaxies: active - galaxies: high-redshift - galaxies: jets

Simbad objects: 31

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Number of rows : 31

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 6C 001403+811827 QSO 00 17 08.4748554 +81 35 08.136591   17.60 16.52 15.95   ~ 358 1
2 QSO J0225+1846 QSO 02 25 04.6672463736 +18 46 48.759971912   20.0 20.0 19.09   ~ 72 1
3 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1393 2
4 QSO B0237-2322 QSO 02 40 08.1742481040 -23 09 15.727160394   16.78 16.63     ~ 473 0
5 QSO B0438-43 QSO 04 40 17.1805718498 -43 33 08.609959495   19.31 19.5 18.2   ~ 250 1
6 QSO B0521-365 BLL 05 22 57.9839686440 -36 27 30.847737786   15.26 14.62 14.48   ~ 712 2
7 QSO J0525-3343 QSO 05 25 06.1754530726 -33 43 05.643316632     18.50 18.5   ~ 48 1
8 Barnard 30 DNe 05 30.3 +12 46           ~ 39 0
9 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 879 1
10 QSO B0537-286 QSO 05 39 54.28147645 -28 39 55.9478122   19.70 20.0 18.789   ~ 240 2
11 7C 055201.39+394824.00 QSO 05 55 30.80561150 +39 48 49.1649664     18.0 17.5   ~ 466 2
12 QSO B0607+710 BLL 06 13 43.7 +71 07 29   19.6 19.61 19.1   ~ 72 0
13 [VV98] J062309.1-643624 BLL 06 23 07.6967637429 -64 36 20.719136879   17.06 14.80 13.59   ~ 71 0
14 ICRF J084047.5+131223 Sy1 08 40 47.58841798 +13 12 23.5641152   18.58 18.15 17.622   ~ 385 1
15 4C 71.07 QSO 08 41 24.36526906 +70 53 42.1730054     16.5 16.8   ~ 695 1
16 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 2000 1
17 QSO B1026-084 QSO 10 28 38.7978854994 -08 44 38.519229195     21.00 19.6   ~ 65 1
18 4C 06.41 BLL 10 41 17.16249895 +06 10 16.9236835   16.86 16.70 16.14   ~ 273 1
19 Ton 580 Sy1 11 31 09.4822135528 +31 14 05.506427771   16.22 16.05 15.8   ~ 129 1
20 2XMM J143020.9+420529 X 14 30 20.907 +42 05 30.24           ~ 2 0
21 7C 142826.80+421756.00 QSO 14 30 23.74163330 +42 04 36.4911889   24.43 22.04 20.2   ~ 114 1
22 QSO B1553+113 BLL 15 55 43.0439413597 +11 11 24.365587666 14.91 14.72 14.57 13.99   ~ 420 1
23 3FGL J1656.2-3303 QSO 16 56 16.78 -33 02 12.7   18.4 17.8 17.5   ~ 63 0
24 ICRF J200755.1-443444 Sy1 20 07 55.1830395039 -44 34 44.280287434   19.3 19.3 18   ~ 135 1
25 QSO B2126-15 QSO 21 29 12.17589777 -15 38 41.0413097   17.61 17.3 17.3   ~ 466 1
26 QSO B2149-306 QSO 21 51 55.52398143 -30 27 53.6979987   17.95 18.0 17.48   ~ 220 1
27 2XMM J215159.2-302735 * 21 51 59.33 -30 27 35.2   16.76   14.88   ~ 2 0
28 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2006 1
29 4C 31.63 BLL 22 03 14.9758020 +31 45 38.269707   15.85 15.58 14.33   ~ 461 1
30 ICRF J233412.8+073627 QSO 23 34 12.8278459757 +07 36 27.549507300   16.0 15.5 16.45   ~ 93 1
31 QSO J2354-1513 QSO 23 54 30.19518762 -15 13 11.2130207   18.49 17 18.88   ~ 114 1

    Equat.    Gal    SGal    Ecl

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2020.07.11-18:25:34

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