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Table 1

X-ray observations log for z > 5.5 quasars with X-ray data.

Object z RA Decl. C/Xa X-ray obs. date C/X Chip-id Cb texp C/Xc θ C/Xd N H g Ref.h
[ks] [arcmin] [1020 cm-2]

NDWFS J142729.7+352209.0 5.53 14:27:29.70 +35:22:09.00 C 2004 Mar. 31 AI(1) 4.7 7.9 1.3 ...
RD J114816.2+525339.3 5.70 11:48:16.21 +52:53:39.30 C/X 2015 Sep. 2/2004 Nov. 4 AS(7) 77.8/3.8 1.8/1.5 1.5 1/...
SDSS J012958.5003539.7 5.78 01:29:58.51 00:35:39.70 X 2015 Jan. 27 ... 1.7 15.7 3.0 ...
SDSS J104433.0012502.2 5.78 10:44:33.04 01:25:02.20 X 2000 May 28 ... 31.5 0.0 4.1 2/3
SDSS J083643.8+005453.2 5.81 08:36:43.86 +00:54:53.26 C 2002 Jan. 29 AS(7) 5.7 0.6 4.4 2/...
SDSS J000239.4+255034.9 5.82 00:02:39.39 +25:50:34.96 C 2005 Jan. 24 AS(7) 5.9 0.6 3.2 4/...
SDSS J084035.1+562420.2 5.84 08:40:35.10 +56:24:20.22 C 2005 Feb. 3 AS(7) 15.8. 0.6 4.2 4/...
SDSS J000552.3000655.8 5.85 00:05:52.34 00:06:55.80 C 2005 Jul. 28 AS(7) 16.9 0.6 3.0 4/...
NDWFS J142516.3+325409.3 5.89 14:25:16.33 +32:54:09.54 C 2003 Mar. 26 AI(0) 4.7 3.2 1.0 ...
SDSS J133550.8+353315.8 5.90 13:35:50.81 +35:33:15.82 C 2008 Mar. 10 AS(7) 23.5 0.3 1.0 ...
SDSS J141111.3+121737.3 5.90 14:11:11.29 +12:17:37.28 C 2005 Mar. 17 AS(7) 14.3 0.6 1.8 4/...
PSO J328.733909.5076 5.92 21:54:56.16 09:30:27.46 X 2004 Nov. 1 ... 23.5 8.2 3.8 ...
SDSS J205321.8+004706.8 5.92 20:53:21.77 +00:47:06.80 C 2014 Dec. 20 AI(0) 9.9 8.6 4.0 ...
ULAS J014837.6+060020.1 5.98 01:48:37.64 +06:00:20.06 X 2002 Jul. 14 ... 9.3 7.6 4.7 ...
PSO J007.0273+04.9571 5.99 00:28:06.56 +04:57:25.64 C 2001 Dec. 7 AS(6) 66.4 8.3 2.9 ...
CFHQS J021627.8045534.1 6.01 02:16:27.81 04:55:34.10 X 2002 Aug. 12 ... 33.1 4.5 2.0 ...
SDSS J130608.3+035626.4 6.02 13:06:08.27 +03:56:26.36 C 2004 Dec. 11 AS(7) 118.2 1.0 2.0 2/...
′′ e 6.02 13:06:08.27 +03:56:26.36 C 2002 Feb. 5 AS(7) 8.2 0.6 2.0 2/...
SDSS J163033.9+401209.7 6.07 16:30:33.90 +40:12:09.69 C 2005 Nov. 4 AS(7) 27.4 0.1 1.0 4/...
SDSS J030331.4001912.9 6.08 03:03:31.40 00:19:12.90 C 2011 Nov. 27 AS(7) 1.5 4.8 6.9 ...
SDSS J160253.9+422824.9 6.09 16:02:53.98 +42:28:24.94 C 2005 Oct. 29 AS(7) 13.2 0.2 1.2 4/...
HSC J221644.5001650.1 6.10 22:16:44.47 00:16:50.10 X 2011 Dec. 7 ... 3.7 13.9 4.9 ...
SDSS J104845.1+463718.6 6.23 10:48:45.07 +46:37:18.55 C 2005 Jan. 10 AS(7) 15.0 0.6 1.4 4/...
SDSS J162331.8+311200.5 6.26 16:23:31.81 +31:12:00.53 C 2004 Dec. 29 AS(7) 17.2 0.6 1.8 4/...
SDSS J010013.0+280225.9 6.30 01:00:13.02 +28:02:25.92 C/X 2015 Oct. 16/2016 Jun. 29 AS(7) 14.8/46.3 0.3/0.0 5.8 5/...
ATLAS J025.682133.4627 6.31 01:42:43.73 33:27:45.47 S 2007 Sep. 11 & 2007 Oct. 3 ... 193.6f 4.7f 4.3 ...
SDSS J103027.1+052455.1 6.31 10:30:27.11 +05:24:55.06 C/X 2002 Jan. 29/2003 May 22 AS(7) 8.0/51.1 0.6/0.0 2.6 2/6
SDSS J114816.7+525150.4 6.42 11:48:16.65 +52:51:50.39 C/X 2015 Sep. 2/2004 Nov. 4 AS(7) 77.8/3.8 0.3/0.0 1.5 1/...
CFHQS J021013.2045620.9 6.43 02:10:13.19 04:56:20.90 X 2012 Jul. 10 ... 5.0 6.3 1.9 ...
ULAS J112001.5+064124.3 7.08 11:20:01.48 +06:41:24.30 C/X 2011 Feb. 4/2012 May 23 AS(7) 15.8/183.6 0.3/0.0 5.1 .../7,8

Notes. For the XMM exposure time and off-axis angle we provide only the information about the EPIC pn camera.

(a)

Public data from Chandra (C) and/or XMM (X) or Swift-XRT (S).

(b)

Chandra chip identification in which the source is observed. AI stands for ACIS-I (the aimpoint is on the chip ID 3) and AS stands for ACIS-S (the aimpoint is on the chip ID 7).

(c)

Exposure time filtered from high-energy time intervals after flare removal.

(d)

Off-axis angle of the source.

(e)

J1306+0356 has two data-sets taken from two different observations.

(f)

This information refers to Swift-XRT observations.

(g)

Galactic column density calculated using the nh FTOOL (NH values from Kalberla et al. 2005).

(h)

References for objects previously published in X-rays: (1) Gallerani et al. (2017); (2) Brandt et al. (2002); (3) Brandt et al. (2001); (4) Shemmer et al. (2006); (5) Ai et al. (2016); (6) Farrah et al. (2004); (7) Moretti et al. (2014); (8) Page et al. (2014).

(†)

BALQs;

(‡)

WLQs;

(⋄)

Weak-IR QSOs found in the literature. See Sect. 5.2.

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