2020ApJ...893...14D

Query : 2020ApJ...893...14D

2020ApJ...893...14D - Astrophys. J., 893, 14-14 (2020/April-2)

Prescriptions for correcting ultraviolet-based redshifts for luminous quasars at high redshift.

DIX C., SHEMMER O., BROTHERTON M.S., GREEN R.F., MASON M. and MYERS A.D.

Abstract (from CDS):

High-redshift quasars typically have their redshift determined from rest-frame ultraviolet (UV) emission lines. However, these lines, and more specifically the prominent C IV λ1549 emission line, are typically blueshifted yielding highly uncertain redshift estimates compared to redshifts determined from rest-frame optical emission lines. We present near-infrared spectroscopy of 18 luminous quasars at 2.15 < z < 3.70 that allows us to obtain reliable systemic redshifts for these sources. Together with near-infrared spectroscopy of an archival sample of 44 quasars with comparable luminosities and redshifts, we provide prescriptions for correcting UV-based redshifts. Our prescriptions reduce velocity offsets with respect to the systemic redshifts by ∼140 km s–1 and reduce the uncertainty on the UV-based redshift by ∼25% with respect to the best method currently used for determining such values. We also find that the redshifts determined from the Sloan Digital Sky Survey Pipeline for our sources suffer from significant uncertainties, which cannot be easily mitigated. We discuss the potential of our prescriptions to improve UV-based redshift corrections given a much larger sample of high-redshift quasars with near-infrared spectra.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy distances - Quasars - Active galactic nuclei

Simbad objects: 63

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Number of rows : 63
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 SDSS J011521.20+152453.3 QSO 01 15 21.2055079128 +15 24 53.379998460           ~ 18 0
2 QSO J0124+0044 QSO 01 24 03.7793700432 +00 44 32.745561900   19.71 18.71 17.9   ~ 101 0
3 QSO B0132-097 QSO 01 34 35.6657627616 -09 31 02.903742300   24.52 22.70 20.80   ~ 113 2
4 QSO J0140-0839 QSO 01 40 49.1830961952 -08 39 42.462483840   19.62 18.57     ~ 57 0
5 QSO J0142+0023 QSO 01 42 14.7480666240 +00 23 24.293809176   19.30 18.70     ~ 53 0
6 [VV2006] J014850.6-090712 QSO 01 48 50.6567855760 -09 07 12.835398000   18.93 18.45     ~ 30 0
7 QSO J0157-0106 QSO 01 57 41.5697767176 -01 06 29.648080260   19.40 18.71     ~ 49 0
8 QSO J0250-0757 QSO 02 50 21.7688505360 -07 57 49.964002668   19.02 18.63     ~ 38 0
9 [VV2006] J025438.4+002132 QSO 02 54 38.3704100280 +00 21 32.690066724   20.13 19.87     ~ 44 0
10 LBQS 0256-0000 QSO 02 59 05.6356015320 +00 11 21.964472340   18.50 18.11     ~ 137 0
11 LBQS 0301-0035 QSO 03 03 41.0487601176 -00 23 21.907819248   18.26 17.93 17.6   ~ 121 0
12 LBQS 0302-0019 QSO 03 04 49.8593341368 -00 08 13.534398816   18.08 17.80 17.5   ~ 261 0
13 QSO J0352-0517 QSO 03 52 20.7002021448 -05 17 02.716155060           ~ 11 0
14 SDSS J073607.63+220758.9 QSO 07 36 07.6341396000 +22 07 58.907801748           ~ 9 0
15 QSO J0753+4231 QSO 07 53 03.3374580696 +42 31 30.765827964   19.16 18.43     ~ 91 1
16 [VV2006] J075819.7+202301 QSO 07 58 19.7063535432 +20 23 01.000642164   19.95 19.13     ~ 29 0
17 2MASS J08043064+5420406 QSO 08 04 30.5728111176 +54 20 41.117018820   19.61 18.81     ~ 35 0
18 [VV2006] J080819.7+373047 QSO 08 08 19.6944956640 +37 30 47.337865812   19.91 19.18     ~ 37 0
19 [VV2006] J080956.0+502001 QSO 08 09 56.0316646272 +50 20 00.929017896   19.25 18.69     ~ 36 0
20 QSO J0810+0936 QSO 08 10 11.9752125648 +09 36 48.261391164   19.74 19.15     ~ 13 0
21 SDSS J081855.78+095848.0 QSO 08 18 55.7827140888 +09 58 47.995294728   19.71 18.81     ~ 41 0
22 QSO J0825+5127 QSO 08 25 35.1937162776 +51 27 06.374726748   19.77 18.92     ~ 49 0
23 [VV2006] J083630.5+062044 QSO 08 36 30.5500805976 +06 20 44.868492276   21.29 20.70     ~ 33 0
24 QSO B0900+42 QSO 09 00 33.5091652824 +42 15 47.031009948   17.63 17.18     ~ 85 0
25 QSO J0910+0237 QSO 09 10 54.7892925768 +02 37 04.622584152   19.51 19.10     ~ 30 0
26 QSO J0942+0422 QSO 09 42 02.0480819568 +04 22 44.548204368   17.78 17.47     ~ 66 0
27 [VV2006] J095141.3+013259 QSO 09 51 41.3379926376 +01 32 59.542487808   20.65 20.50     ~ 30 0
28 QSO J0954+0915 QSO 09 54 34.9385140704 +09 15 19.587510180   20.17 19.53     ~ 32 0
29 [VV2006] J100710.8+042119 QSO 10 07 10.7088377040 +04 21 19.194025320   20.41 20.39     ~ 24 0
30 [VV2006] J101257.5+025933 QSO 10 12 57.5278905720 +02 59 33.130199832   19.74 19.55     ~ 33 0
31 QSO J1019+0254 QSO 10 19 08.2614843816 +02 54 31.979296008   19.20 18.74     ~ 31 0
32 QSO B1031+0414 QSO 10 34 56.3122729872 +03 58 59.378287224   18.79 18.25     ~ 43 0
33 [VV2006] J105512.0+020751 QSO 10 55 12.0008765184 +02 07 51.930514560   20.59 20.09     ~ 27 0
34 [VV2006] J113838.2-020607 QSO 11 38 38.2726842504 -02 06 07.271026200   20.17 19.81     ~ 29 0
35 [VV2006] J115111.2+034048 QSO 11 51 11.2030713240 +03 40 48.353567376   21.03 20.78     ~ 28 0
36 [VV2006] J115304.6+035951 QSO 11 53 04.6265109720 +03 59 51.592864812   20.47 19.79     ~ 31 0
37 [VV2006] J115935.6+042420 QSO 11 59 35.6354965704 +04 24 20.094789780   20.22 19.66 19.6   ~ 35 0
38 2MASS J11595433+2019212 QSO 11 59 54.3311536560 +20 19 21.135293688   18.55 17.92     ~ 29 0
39 [VV2006] J125034.4-010511 QSO 12 50 34.4132840064 -01 05 10.512058128   20.39 20.30     ~ 35 0
40 [VV2006] J142243.0+441721 QSO 14 22 43.0262924160 +44 17 21.323456196   19.96 19.08     ~ 39 0
41 QSO J1442-0242 QSO 14 42 45.6696243552 -02 42 50.073386724   19.86 19.55     ~ 33 0
42 [VV2006] J153725.4-014650 QSO 15 37 25.3586552688 -01 46 50.357384652   20.44 19.83 19.6   ~ 30 0
43 2MASS J15375010+2010357 QSO 15 37 50.1024082080 +20 10 35.646731076   19.27 18.75     ~ 16 0
44 QSO J1538+0855 QSO 15 38 30.5596599072 +08 55 17.150004552   18.77 17.98     ~ 39 0
45 QSO J1544+5358 QSO 15 43 59.4395014128 +53 59 03.147801000   17.19 17.10     ~ 97 0
46 [VV2006] J154446.3+412035 QSO 15 44 46.3426267128 +41 20 35.701415124   20.88 19.67     ~ 33 0
47 2MASS J15493872+1245092 QSO 15 49 38.7147322320 +12 45 09.161026308   19.21 18.54 17.61   ~ 40 0
48 FIRST J155013.6+200154 QSO 15 50 13.6405490136 +20 01 54.604196904   17.81 17.53     ~ 22 0
49 QSO B1559+089 QSO 16 02 22.7307649704 +08 45 38.453475636   17.59 17.32     ~ 33 0
50 [VV2006] J163300.1+362904 QSO 16 33 00.1384440000 +36 29 04.887068172   20.09 19.15     ~ 35 0
51 QSO J1651+4002 BLL 16 51 37.5261118920 +40 02 18.970582056   17.79 17.63     ~ 57 0
52 SDSS J172237.85+385951.8 QSO 17 22 37.8546542328 +38 59 51.876685716           ~ 12 0
53 [VV2006] J173352.2+540030 QSO 17 33 52.2311709504 +54 00 30.514515120   18.07 17.60     ~ 61 0
54 [VV2006] J210258.2+002023 QSO 21 02 58.2190948152 +00 20 23.455050540   21.21 20.85     ~ 26 0
55 2MASS J21052449+0004073 QSO 21 05 24.4929889752 +00 04 07.267776384   17.56 16.98     ~ 17 0
56 SDSS J212329.46-005052.9 QSO 21 23 29.4639412848 -00 50 52.916363736   16.91 16.62     ~ 131 0
57 [VV2006] J213023.6+122252 QSO 21 30 23.6213100504 +12 22 52.288727736   18.68 18.33     ~ 33 0
58 PSO J333.7751+15.2023 QSO 22 15 06.0262642104 +15 12 08.580718728           ~ 11 0
59 2MASS J22495608+0002182 QSO 22 49 56.0891963592 +00 02 18.159421020   19.17 18.75     ~ 29 0
60 KODIAQ J230301-093930 QSO 23 03 01.4579957256 -09 39 30.654165780   18.64 18.12     ~ 41 0
61 [VV2006] J232735.7-091626 QSO 23 27 35.6755698504 -09 16 25.589434476   19.39 18.93     ~ 23 0
62 QSO J2346-0016 QSO 23 46 25.6709113344 -00 16 00.427438668   19.44 18.73     ~ 63 0
63 QSO B2355+01 QSO 23 58 08.5422487128 +01 25 07.227052428   17.5 17.5     ~ 28 0

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