2019MNRAS.482.2016Z

Query : 2019MNRAS.482.2016Z

2019MNRAS.482.2016Z - Mon. Not. R. Astron. Soc., 482, 2016-2038 (2019/January-2)

Investigating the X-ray enhancements of highly radio-loud quasars at z > 4.

ZHU S.F., BRANDT W.N., WU J., GARMIRE G.P. and MILLER B.P.

Abstract (from CDS):

We have investigated the jet-linked X-ray emission from highly radio-loud quasars (HRLQs; log R > 2.5) at high redshift. We studied the X-ray properties of 15 HRLQs at z > 4, using new Chandra observations for six objects and archival XMM-Newton and Swift observations for the other nine. We focused on testing the apparent enhancement of jet-linked X-ray emission from HRLQs at z > 4. Utilizing an enlarged (24 objects) optically flux-limited sample with complete X-ray coverage, we confirmed that HRLQs at z > 4 have enhanced X-ray emission relative to that of HRLQs at z ≃ 1-2 with matched UV/optical and radio luminosity, at a 4.0-4.6 σ level; the X-ray enhancements are confirmed considering both two-point spectral indices and inspection of broad-band spectral energy distributions. The typical factor of enhancement is revised to 1.9+0.5–0.4, which is smaller than but consistent with previous results. A fractional inverse-Compton/cosmic microwave background (IC/CMB) model can still explain our results at high redshift, which puts tighter constraints on the fraction of IC/CMB X-rays at lower redshifts, assuming the physical properties of quasar jets do not have a strong redshift dependence. A dominant IC/CMB model is inconsistent with our data.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: high-redshift - quasars: general - X-rays: galaxies

Simbad objects: 49

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Number of rows : 49
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [VV2006] J003126.8+150739 QSO 00 31 26.7997623408 +15 07 39.505383552   22.95 21.56     ~ 40 1
2 QSO J0121+0347 QSO 01 21 26.1474572280 +03 47 06.753783480     17.90     ~ 43 0
3 ICRF J025759.0+433837 QSO 02 57 59.07770913 +43 38 37.6752143           ~ 27 1
4 SDSS J030437.21+004653.7 QSO 03 04 37.213 +00 46 53.70   22.72 21.48     ~ 26 0
5 QSO J0324-2918 Bla 03 24 44.2954658256 -29 18 21.220152624     18.66 19.41   ~ 54 1
6 QSO J0525-3343 Bla 05 25 06.1749810960 -33 43 05.643939828     18.50 18.5   ~ 62 1
7 QSO J0635-7516 Bla 06 35 46.5079301472 -75 16 16.816418256   15.96 15.75 15.82   ~ 625 1
8 7C 072722.80+405643.00 Bla 07 30 51.3491 +40 49 50.822   18.70 18.47 18.38   ~ 76 1
9 QSO J0813+3508 QSO 08 13 33.3272185776 +35 08 10.787201808   24.72 22.54     ~ 48 1
10 SDSS J082511.60+123417.2 QSO 08 25 11.605 +12 34 17.22           ~ 8 0
11 SDSS J083549.42+182520.0 QSO 08 35 49.4270 +18 25 20.055           ~ 19 1
12 QSO J0906+6930 Bla 09 06 30.74874670 +69 30 30.8287169       21.65   ~ 96 1
13 QSO J0913+5919 QSO 09 13 16.551 +59 19 21.68   24.96 23.32 24.948   ~ 65 0
14 QSO J0940+0526 QSO 09 40 04.801 +05 26 30.99           ~ 18 0
15 SDSS J102107.57+220921.4 QSO 10 21 07.57656 +22 09 21.4524           ~ 20 1
16 7C 102336.6+255813 QSO 10 26 23.62115 +25 42 59.4292   24.98 23.18     ~ 86 1
17 QSO B1026-084 Bla 10 28 38.79646593 -08 44 38.5362663     21.00 19.6   ~ 77 1
18 SDSS J104742.57+094744.9 QSO 10 47 42.5811752568 +09 47 44.948053356           ~ 9 0
19 SDSS J111323.35+464524.3 QSO 11 13 23.35896 +46 45 24.3864           ~ 6 0
20 QSO J1139-1350 Bla 11 39 10.7025556152 -13 50 43.639196064   16.38 16.17 16.4   ~ 284 1
21 ICRF J115503.1-310758 Bla 11 55 03.15768331 -31 07 58.7280838       19.10   ~ 29 1
22 7C 115330.30+450032.00 QSO 11 56 05.44005 +44 43 56.5517           ~ 11 1
23 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
24 SDSS J123142.17+381658.9 QSO 12 31 42.1733201928 +38 16 59.050272720   22.18 21.20     ~ 33 1
25 4C -02.55 Bla 12 32 00.0159535440 -02 24 04.793069304   17.41 17.06 16.4   ~ 440 1
26 QSO J1235-0003 QSO 12 35 03.0467575584 -00 03 31.746486564   23.96 22.46     ~ 50 0
27 [VV2006] J123726.3+651724 QSO 12 37 26.2413194784 +65 17 24.434233548   23.58 22.09     ~ 28 1
28 QSO J1242+5422 QSO 12 42 30.5903382528 +54 22 57.471407076   24.87 22.63     ~ 40 1
29 SDSS J125300.15+524803.4 QSO 12 53 00.15270 +52 48 03.3996           ~ 14 1
30 [VV2006] J132512.5+112330 QSO 13 25 12.4927366824 +11 23 29.838681816   22.66 20.95     ~ 60 0
31 SDSS J134811.25+193523.6 QSO 13 48 11.2626340224 +19 35 23.585385516           ~ 15 1
32 4C 19.44 Bla 13 57 04.4366598768 +19 19 07.371837768   16.33 16.03 15.3   ~ 472 2
33 QSO J1400+3149 QSO 14 00 25.4166065664 +31 49 10.672950036           ~ 19 0
34 SDSS J141209.96+062406.8 QSO 14 12 09.9691953864 +06 24 06.868135080   22.56 21.35     ~ 43 1
35 SDSS J142048.01+120545.9 QSO 14 20 48.0094133568 +12 05 45.979158120   21.96 20.94     ~ 39 1
36 7C 1428+4218 Bla 14 30 23.74163471 +42 04 36.4910561   24.43 22.04 20.2   ~ 157 1
37 QSO B1508+572 QSO 15 10 02.92237321 +57 02 43.3759220   22.73 21.38 19.23   ~ 223 1
38 SDSS J153533.88+025423.3 QSO 15 35 33.8865473520 +02 54 23.444408556           ~ 21 1
39 SDSS J153830.71+424405.6 QSO 15 38 30.715 +42 44 05.63           ~ 9 0
40 QSO J1548+3335 QSO 15 48 24.013 +33 35 00.11           ~ 19 1
41 SDSS J160528.21+272854.4 QSO 16 05 28.211 +27 28 54.49           ~ 14 0
42 7C 161047.50+471030.00 QSO 16 12 16.7526963240 +47 02 53.592691632           ~ 18 1
43 SDSS J165539.74+283406.7 QSO 16 55 39.7442949456 +28 34 06.800745180           ~ 8 0
44 QSO J1659+2101 QSO 16 59 13.2291680880 +21 01 15.797607960   24.97 23.17     ~ 38 0
45 QSO B1713+218 QSO 17 15 21.253 +21 45 31.84     21.00     ~ 24 1
46 ICRF J195136.0+013442 Bla 19 51 36.01845207 +01 34 42.7140712       19.40   ~ 36 1
47 QSO J2134-0419 QSO 21 34 12.0103883184 -04 19 09.866519544     19.98     ~ 31 1
48 SDSS J222032.50+002537.5 QSO 22 20 32.5027007856 +00 25 37.508561724   23.9669 21.5403 20.2745 20.2655 ~ 39 1
49 [VV2006] J231448.7+020151 QSO 23 14 48.7159854264 +02 01 51.111292944     19.87     ~ 25 1

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