CDS

2019A&A...631A.120S

Query : 2019A&A...631A.120S

2019A&A...631A.120S - Astronomy and Astrophysics, volume 631A, 120-120 (2019/11-1)

Quasars as standard candles II. The non-linear relation between UV and X-ray emission at high redshifts.

SALVESTRINI F., RISALITI G., BISOGNI S., LUSSO E. and VIGNALI C.

Abstract (from CDS):

A tight non-linear relation between the X-ray and the optical-ultraviolet (UV) emission has been observed in active galactic nuclei (AGN) over a wide range of redshift and several orders of magnitude in luminosity, suggesting the existence of an ubiquitous physical mechanism regulating the energy transfer between the accretion disc and the X-ray emitting corona. Recently, our group developed a method to use this relation in observational cosmology, turning quasars into standardizable candles. This work mainly seeks to investigate the potential evolution of this correction at high redshifts. We thus studied the LX-LUV relation for a sample of quasars in the redshift range 4<z<7, adopting the selection criteria proposed in our previous work regarding their spectral properties. The resulting sample consists of 53 type 1 (unobscured) quasars, observed either with Chandra or XMM-Newton, for which we performed a full spectral analysis, determining the rest-frame 2keV flux density, as well as more general X-ray properties such as the estimate of photon index, and the soft (0.5-2keV) and hard (2-10keV) unabsorbed luminosities. We find that the relation shows no evidence for evolution with redshift. The intrinsic dispersion of the LX-LUV for a sample free of systematics/contaminants is of the order of 0.22dex, which is consistent with previous estimates from our group on quasars at lower redshift.

Abstract Copyright: © ESO 2019

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

Simbad objects: 53

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Number of rows : 53
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023 		#notes
1 QSO J0040-0915 BLL 00 40 54.6575670840 -09 15 26.833615164   26.46 22.40     ~ 55 0
2 QSO J0050-0053 QSO 00 50 06.3495668808 -00 53 19.234743900   22.45 21.20     ~ 39 0
3 QSO J0059+0003 QSO 00 59 22.6502935968 +00 03 01.440525204   23.24 21.11     ~ 53 0
4 SDSS J010013.02+280225.8 QSO 01 00 13.0246669824 +28 02 25.791716364           ~ 114 0
5 QSO B0103+00 QSO 01 06 19.2392271120 +00 48 23.369353992   21.68 20.23     ~ 90 0
6 QSO J0133+0400 QSO 01 33 40.3265690928 +04 00 59.844453768     18.30     ~ 63 0
7 QSO J0209+0517 QSO 02 09 44.6218858992 +05 17 13.727761872     17.80     ~ 53 0
8 QSO J0211-0009 QSO 02 11 02.7239895552 -00 09 10.336384080     22.00     ~ 42 0
9 QSO J0231-0728 QSO 02 31 37.6463945454 -07 28 54.550661965   25.25 23.17     ~ 66 0
10 QSO J0747+4434 QSO 07 47 49.7379630144 +44 34 17.086179108   22.88 21.15     ~ 56 0
11 QSO J0756+4104 QSO 07 56 18.139 +41 04 08.61   25.29 23.32     ~ 53 0
12 QSO J0756+4502 QSO 07 56 52.0580291737 +45 02 58.891124674   24.73 23.03     ~ 28 0
13 QSO B0805+5224 QSO 08 08 49.4238903240 +52 15 15.242663556   21.79 20.40     ~ 56 0
14 [VV2006] J083103.0+523533 QSO 08 31 03.0104279160 +52 35 33.521625060   22.58 21.16     ~ 39 0
15 SDSS J083643.85+005453.3 QSO 08 36 43.8598536120 +00 54 53.233681320   26.19 24.17     ~ 144 0
16 QSO J0941+5947 QSO 09 41 08.3595571920 +59 47 25.771706232   24.62 22.39     ~ 35 0
17 QSO J0951+5945 QSO 09 51 51.188 +59 45 56.16   25.21 23.27     ~ 29 0
18 QSO J0955+5940 QSO 09 55 11.3292372432 +59 40 30.651561732   21.12 19.74     ~ 45 0
19 QSO B0957+33 QSO 09 57 44.4641685312 +33 08 20.768397468   20.70 19.42     ~ 64 0
20 QSO J1023+6335 QSO 10 23 32.0863549416 +63 35 08.068944300   24.30 22.59     ~ 30 0
21 [VV2006] J102622.9+471906 QSO 10 26 22.8654176208 +47 19 07.175641008   24.61 22.18     ~ 32 0
22 SDSS J103027.09+052455.0 QSO 10 30 27.092 +05 24 55.02   26.15 25.44     ~ 251 0
23 QSO J1051+3545 QSO 10 51 23.0335815072 +35 45 34.298215236   25.68 22.77     ~ 44 0
24 [VV2006] J105323.0+580411 QSO 10 53 22.9856440752 +58 04 12.126352260   26.31 23.63     ~ 30 0
25 QSO J1057+4555 QSO 10 57 56.2610108784 +45 55 53.070401748   20.19 18.80 17.2 16.8 ~ 114 0
26 [VV2006] J111812.9+441122 QSO 11 18 12.9087149136 +44 11 22.235811000   21.33 20.34     ~ 27 0
27 QSO J1120+0641 QSO 11 20 01.463 +06 41 23.79           ~ 209 0
28 SDSS J114816.64+525150.3 QSO 11 48 16.647 +52 51 50.31   25.73 25.04     ~ 436 0
29 QSO J1204-0021 QSO 12 04 41.7296276952 -00 21 49.533353712   25.41 22.94     ~ 74 0
30 [VV2006] J130216.2+003031 QSO 13 02 16.1351008824 +00 30 32.144356404   23.63 22.10     ~ 40 0
31 SDSS J130608.25+035626.3 QSO 13 06 08.259 +03 56 26.19   25.59 24.81     ~ 149 0
32 QSO J1317+3531 QSO 13 17 43.1304151704 +35 31 31.964624292   22.58 20.95     ~ 41 0
33 [VV2006] J132611.9+074358 QSO 13 26 11.8504307808 +07 43 58.372083372   20.25 18.96     ~ 50 0
34 [VV2006] J133422.6+475033 QSO 13 34 22.6375160520 +47 50 33.494162712   25.50 23.02     ~ 31 0
35 [VV2006] J134743.3+495622 QSO 13 47 43.2948031200 +49 56 21.244863768   20.59 19.26     ~ 55 0
36 QSO J1401+0244 QSO 14 01 46.5361320120 +02 44 34.755692604   22.03 20.32     ~ 46 0
37 QSO J1408+0205 QSO 14 08 50.9138577456 +02 05 22.680293784   20.55 19.75     ~ 35 0
38 SDSS J141111.27+121737.3 QSO 14 11 11.277 +12 17 37.31   24.79 23.82     ~ 70 0
39 QSO J1413+0000 QSO 14 13 15.3675271440 +00 00 32.338894212   21.89 20.68     ~ 42 0
40 SDSS J142103.83+343332.0 QSO 14 21 03.8342520264 +34 33 31.993246512   25.16 22.81     ~ 32 0
41 SDSS J142705.86+330817.9 QSO 14 27 05.8653414384 +33 08 17.897732520   23.65 21.97 19.58 18.40 ~ 32 0
42 QSO J1443+2724 QSO 14 43 31.1697928632 +27 24 36.768781008     19.3     ~ 87 0
43 QSO J1444-0123 QSO 14 44 28.6293273096 -01 23 44.061469764   21.73 20.55     ~ 37 0
44 [VV2006] J153650.3+500810 QSO 15 36 50.2576992576 +50 08 10.320869184   24.23 22.03     ~ 32 0
45 SDSS J160253.98+422824.8 QSO 16 02 53.982 +42 28 24.86   24.32 24.32     ~ 58 0
46 QSO J1603+0721 QSO 16 03 20.8885067088 +07 21 04.515609672   21.92 20.46     ~ 36 0
47 SDSS J162331.81+311200.5 QSO 16 23 31.806 +31 12 00.55   24.77 25.16     ~ 74 0
48 SDSS J163033.89+401209.6 QSO 16 30 33.898 +40 12 09.68   26.45 25.01     ~ 78 0
49 QSO J1737+5828 QSO 17 37 44.8816610544 +58 28 29.588650716   25.47 22.95     ~ 50 0
50 IMS J221644+001348 QSO 22 16 44.017 +00 13 48.12     23.0947 21.8154 20.1849 ~ 33 0
51 QSO J2225-0014 QSO 22 25 09.1923562032 -00 14 06.799695468   23.45 21.91     ~ 45 0
52 QSO J2228-0757 QSO 22 28 45.1385957995 -07 57 55.319678934   26.22 23.86     ~ 32 0
53 [VV2006] J235718.4+004350 QSO 23 57 18.3619645248 +00 43 50.431495872   23.01 21.43     ~ 43 0

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2023.03.31-21:07:39

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