2025ApJ...985...63L

Query : 2025ApJ...985...63L

2025ApJ...985...63L - Astrophys. J., 985, 63 (2025/May-3)

Probing the He II re-Ionization ERa via Absorbing C IV Historical Yield (HIERACHY). II. Project Design, Current Status, and Examples of Initial Data Products.

LI J.-T., YU X., MAO H., CHEN H., YANG T., QU Z., BIAN F., BREGMAN J.N., CAI Z., FAN X., FANG T., JI L., JI Z., JOHNSON S.D., LI G., LIU W., SONG Y.-Y., WANG F., WANG T., WANG X., WILLIAMS C., XU M., YANG J., YANG Y. and ZHENG X.

Abstract (from CDS):

The He II reionization epoch is expected to take place at z ∼ 3-5. In this stage, the helium and metals in the intergalactic medium are further ionized with additional contributions from harder nonstellar sources, and some large-scale gravitationally bound systems approach virialization. The Probing the He II re-Ionization ERa via Absorbing C IV Historical Yield (HIERACHY) program utilizes high- and medium-resolution spectra of bright background quasars at z ≈ 3.9-5.2 to investigate Lyα, C IV, and other metal absorption lines during this epoch. Additionally, we employ narrowband imaging to search for Lyα emitters associated with C IV absorbers, alongside multiwavelength observations to identify and study particularly intriguing cases. In this paper, we present the design of the HIERACHY program, its current status, major scientific goals, and examples of initial data products from completed Magellan/MIKE, MagE spectroscopy, and MDM imaging observations. We also provide a brief outlook on future multiwavelength observations that may significantly impact the related science.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Intracluster medium - Intergalactic medium - Reionization - High-redshift galaxy clusters - Quasars - Large-scale structure of the universe

Simbad objects: 55

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Number of rows : 55
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 QSO J0007-5701 QSO 00 07 36.5729300931 -57 01 51.841175770           ~ 6 0
2 [VV2006] J001115.2+144601 QSO 00 11 15.2339604624 +14 46 01.809704964   22.68 20.95     ~ 66 0
3 SMSS J001224.98-484829.9 QSO 00 12 25.0202592992 -48 48 30.096142559           ~ 6 0
4 SDSS J005527.18+122840.6 QSO 00 55 27.1882588896 +12 28 40.714529772           ~ 4 0
5 QSO J0131-0321 QSO 01 31 27.3474070344 -03 21 00.075737592           ~ 47 0
6 PSO J023.9137-21.4412 BLL 01 35 39.2948912378 -21 26 28.391233718           ~ 8 1
7 SDSS J014741.53-030247.8 QSO 01 47 41.5298173872 -03 02 47.877638064           ~ 7 0
8 SDSS J015618.99-044139.8 QSO 01 56 18.9925829400 -04 41 39.816785544           ~ 6 0
9 SDSS J024601.95+035054.1 QSO 02 46 01.9509076898 +03 50 54.131318038           ~ 4 0
10 SDSS J024643.78+061045.7 QSO 02 46 43.7826868128 +06 10 45.810113664           ~ 3 0
11 QSO J0307-4945 QSO 03 07 22.8949808808 -49 45 48.274545240     18.76     ~ 69 0
12 PSO J059.9780+05.7388 QSO 03 59 54.73391040 +05 44 19.9962600           ~ 1 0
13 PSO J062.3119-27.9424 QSO 04 09 14.8755158247 -27 56 32.889947586           ~ 6 0
14 WISEA J044432.51-292419.0 QSO 04 44 32.5200 -29 24 19.079           ~ 2 0
15 PSO J072.7390-26.9281 QSO 04 50 57.37926000 -26 55 41.4435720           ~ 2 0
16 SDSS J045427.95-050049.3 QSO 04 54 27.9545031336 -05 00 49.458118824           ~ 5 0
17 SDSS J065330.25+152604.7 QSO 06 53 30.2511102816 +15 26 04.826226912           ~ 3 0
18 WISE J072011.61-675631.8 QSO 07 20 11.6721136269 -67 56 31.542371725           ~ 4 0
19 SDSS J075332.00+101511.6 QSO 07 53 32.0126679096 +10 15 11.660672160           ~ 2 0
20 [VV2006] J090634.8+023433 QSO 09 06 34.8362017704 +02 34 33.899158668   22.49 20.84     ~ 35 0
21 PSO J139.2319-25.1960 QSO 09 16 55.67798400 -25 11 45.7792080           ~ 3 0
22 [VV2006] J094409.5+100656 QSO 09 44 09.5214922872 +10 06 56.679507576   23.96 22.34     ~ 32 0
23 SDSS J094604.79+183539.7 QSO 09 46 04.7869942152 +18 35 39.482034000           ~ 17 0
24 WISEA J095139.70-274210.7 QSO 09 51 39.70666 -27 42 10.7109           ~ 1 0
25 2MASS J10011459+2115102 QSO 10 01 14.5949726400 +21 15 10.403193708   20.92 19.72     ~ 22 0
26 PSO J153.8723-12.2206 QSO 10 15 29.36671680 -12 13 14.3416560           ~ 6 0
27 WISEA J110837.58-185408.3 QSO 11 08 37.58143 -18 54 08.3954           ~ 1 0
28 PSO J167.7278-30.1916 QSO 11 10 54.6873813850 -30 11 29.941165260           ~ 9 0
29 SDSS J111700.43-111930.6 QSO 11 17 00.4361012952 -11 19 30.616421556           ~ 3 0
30 QSO B1202-074 QSO 12 05 23.1360370080 -07 42 32.759842896     17.5     ~ 389 5
31 PSO J183.5112-12.5968 QSO 12 14 02.70589920 -12 35 48.7751280           ~ 2 0
32 WISEA J123141.01-184150.0 QSO 12 31 41.0151 -18 41 50.004           ~ 1 0
33 DENIS J125049.2-065758 QSO 12 50 49.2551083733 -06 57 58.614504676         18.092 ~ 2 0
34 PSO J195.1297-28.4919 QSO 13 00 31.1312902738 -28 29 30.995864787           ~ 4 0
35 PSO J212.0075-27.9723 QSO 14 08 01.81738560 -27 58 20.3515320           ~ 5 0
36 PSO J216.8398-05.0647 QSO 14 27 21.5540234407 -05 03 53.155430420           ~ 5 0
37 QSO J1433+0227 QSO 14 33 52.2087347832 +02 27 13.974100416   22.31 20.74     ~ 46 0
38 [VV2006] J145147.1-151220 QSO 14 51 47.0510334120 -15 12 20.230974720     19.14     ~ 28 0
39 [VV2006] J150937.9+343049 QSO 15 09 37.9227993408 +34 30 49.330846764   20.59 20.31     ~ 26 0
40 PSO J229.7971-06.8452 QSO 15 19 11.3207129501 -06 50 42.999022897           ~ 2 0
41 WISE J153359.76-181027.2 QSO 15 33 59.76000 -18 10 27.2100           ~ 4 0
42 PSO J304.9155-19.7882 QSO 20 19 39.72586320 -19 47 17.8379880           ~ 1 0
43 WISE J203310.46+121851.5 QSO 20 33 10.47000 +12 18 51.4900           ~ 3 0
44 [VV2006] J205724.2-003019 QSO 20 57 24.1491890928 -00 30 18.755738244   22.51 21.14     ~ 35 0
45 SMSS J211920.85-772253.1 QSO 21 19 20.8645025794 -77 22 53.270560974           ~ 6 0
46 SDSS J215216.09+104052.4 QSO 21 52 16.0970315832 +10 40 52.389814512           ~ 4 0
47 2MASS J21572822-3602151 QSO 21 57 28.2296315568 -36 02 15.202409928           ~ 15 0
48 WISEA J220158.60-202627.4 QSO 22 01 58.6050 -20 26 27.466           ~ 2 0
49 PSO J332.7980-33.0460 QSO 22 11 11.5543638110 -33 02 45.915387126           ~ 4 0
50 PSO J335.4703-18.4341 QSO 22 21 52.88244240 -18 26 02.9387040           ~ 6 0
51 PSO J335.9911-25.4428 QSO 22 23 57.88122240 -25 26 34.4308920           ~ 2 0
52 SDSS J225944.26+093624.4 QSO 22 59 44.2652209648 +09 36 24.361632876           ~ 2 0
53 PSO J346.1245-31.5741 QSO 23 04 29.8937045643 -31 34 27.113093248           ~ 5 0
54 SMSS J233505.87-590103.3 QSO 23 35 05.8988643690 -59 01 03.386770104           ~ 6 0
55 QSO J2344+1653 QSO 23 44 33.5003453952 +16 53 16.565835048           ~ 11 0

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