2025ApJS..279...32Y

Query : 2025ApJS..279...32Y

2025ApJS..279...32Y - Astrophys. J., Suppl. Ser., 279, 32 (2025/July-0)

CRAFTS for H I Cosmology. I. Data Processing Pipeline and Validation Tests.

YANG W., WOLZ L., LI Y., HU W., CUNNINGTON S., GRAINGE K., DENG F., ZUO S., SHU S., ZHAO X., LI D., ZHENG Z., KRCO M., ZHENG Y., FENG L., ZUO P., CHEN H., JIANG X.-J., WANG C., WANG P., MIAO C.-C., WANG Y. and CHEN X.

Abstract (from CDS):

We present the calibration procedures and validation of source measurement with the data of the Commensal Radio Astronomy FAST Survey for H I intensity mapping by the Five-hundred-meter Aperture Spherical Radio Telescope. Using a 70 hr drift-scan observation with the L-band (1.05-1.45 GHz) 19 beam receiver, we obtain the data covering a 270 deg2 sky area. We employ both the pulsar backend and the spectrum backend to calibrate the spectral time-ordered data (TOD) before projecting them onto HEALPix maps. We produce calibrated TOD with a frequency resolution of 30 kHz and time resolution of 1 s and the map data cube with a frequency resolution of 30 kHz and spatial resolution of 2.95 arcmin2. We examine the pointing errors, noise overflow, radio-frequency interference (RFI) contamination, and their effect on the data quality. The resulting noise level is ∼5.7 mJy for the calibrated TOD and 1.6 mJy for the map, consistent with the theoretical predictions within 5% at RFI-free channels. We also validate the data by principal component analysis and find that the residual map looks thermal noise dominated after removing 30 modes. We identify 447 isolated bright continuum sources in our data matching the NRAO VLA Sky Survey catalog, with relative flux error of 8.3% for TOD and 6.6% for the map level. We also measure the H I emission of 90 galaxies with redshift z < 0.07 and compare them with H I-MaNGA spectra, yielding an overall relative H I integral flux error of 16.7%. These results provide an important first step in assessing the feasibility of conducting cosmological H I detection with CRAFTS.

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

Journal keyword(s): Observational cosmology

Simbad objects: 90

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Number of rows : 90
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 LEDA 2228004 EmG 11 59 51.032 +43 44 26.48           ~ 18 0
2 MCG+08-22-052 G 12 00 38.537 +44 24 23.93   17       ~ 21 0
3 MCG+07-25-018 G 12 04 56.4994135440 +43 19 38.255790000   16       ~ 14 0
4 MCG+07-25-025 G 12 07 03.79751 +42 59 04.7302   17       ~ 9 0
5 NGC 4135 Sy2 12 09 08.8089458664 +44 00 11.324839788   14.79 14.02     ~ 56 0
6 UGC 7135 A EmG 12 09 14.40691 +44 05 26.1221           ~ 14 0
7 Z 215-38 AGN 12 09 38.09819 +42 00 34.8318   15.5       ~ 27 0
8 LEDA 2220691 G 12 10 33.176 +43 26 08.77           ~ 12 0
9 Z 243-49 G 12 10 49.2787346640 +44 30 45.317710656   15.4       ~ 29 0
10 LEDA 4002051 G 12 12 33.87058 +41 37 15.4917           ~ 8 0
11 Z 215-54 EmG 12 14 38.3517885312 +43 32 10.300902612   15.3       ~ 28 0
12 Z 215-59 AGN 12 18 12.863 +44 10 23.77   14.2       ~ 57 0
13 MCG+08-23-019 G 12 24 13.9952379384 +44 56 15.414499824   16.0       ~ 22 0
14 Z 216-3 AGN 12 27 38.0486604336 +40 09 37.809658620   15.0       ~ 43 1
15 MCG+07-26-015 G 12 31 00.3183114672 +42 31 36.906019572   15       ~ 17 0
16 UGC 7738 EmG 12 34 35.514 +42 26 16.98   16.0       ~ 29 0
17 LEDA 91214 G 12 36 38.79533 +40 15 55.1523           ~ 12 0
18 Z 216-15 G 12 36 59.1814072632 +40 20 51.939267432   15.3       ~ 14 0
19 LEDA 4011687 EmG 12 44 11.26 +41 40 05.6           ~ 7 0
20 LEDA 2236409 G 12 51 54.483 +44 05 36.25           ~ 17 0
21 UGC 8104 G 12 59 32.49584 +42 45 32.4930   17       ~ 23 0
22 Z 245-15 AGN 13 04 20.694 +45 03 23.91   15.6       ~ 31 0
23 Z 218-22 G 13 33 29.8984030272 +40 31 46.745406012   15.6       ~ 35 0
24 Z 218-26 G 13 35 50.0879583552 +40 16 18.028746336   15.5       ~ 33 0
25 Z 218-32 G 13 39 13.9059728832 +44 15 03.436748100   15.7       ~ 18 0
26 RX J1343.5+4138 X 13 43 34.87 +41 36 58.0           ~ 9 2
27 MCG+07-28-064 G 13 46 50.372 +42 39 04.72   15       ~ 31 0
28 NGC 5383 EmG 13 57 04.9709727768 +41 50 46.419238680   12.5   10.95   ~ 353 0
29 UGCA 385 EmG 14 06 42.543 +44 25 54.02   16       ~ 17 0
30 Z 219-60 EmG 14 13 40.0329585792 +43 51 59.661967356   15.1       ~ 42 0
31 MCG+07-29-061 G 14 17 08.201 +42 40 57.95   17.8   17.7   ~ 30 0
32 LEDA 2162133 AG? 14 21 56.997 +40 11 44.89           ~ 18 0
33 LEDA 2204552 EmG 14 26 11.1836214864 +42 42 40.517213688           ~ 24 0
34 LEDA 91359 EmG 14 27 30.426 +40 57 49.38           ~ 28 0
35 LEDA 2165342 EmG 14 27 37.1202673680 +40 24 26.253267696           ~ 22 0
36 LEDA 2169899 EmG 14 32 45.978 +40 42 59.92           ~ 21 0
37 LEDA 2193470 G 14 55 56.175 +42 09 35.34           ~ 16 0
38 LEDA 2183601 EmG 14 56 49.422 +41 35 46.87           ~ 17 0
39 MCG+07-31-020 EmG 15 02 22.208 +41 55 18.20   16       ~ 27 0
40 MCG+07-31-031 Sy2 15 05 43.5893966856 +44 24 17.901347076   16       ~ 54 0
41 MCG+07-31-032 LSB 15 05 57.042 +42 13 32.62   17       ~ 19 0
42 LEDA 2188844 EmG 15 07 57.4288148400 +41 54 08.683547004           ~ 20 0
43 LEDA 4005470 EmG 15 08 04.080 +42 49 08.47           ~ 20 0
44 LEDA 2203801 EmG 15 09 19.018 +42 40 30.26           ~ 16 0
45 LEDA 2202094 EmG 15 09 26.505 +42 35 43.57           ~ 17 0
46 LEDA 2202343 EmG 15 10 11.401 +42 36 25.72           ~ 23 0
47 LEDA 169758 EmG 15 11 42.767 +43 58 13.65           ~ 23 0
48 LEDA 2235514 EmG 15 13 12.951 +44 03 19.44           ~ 22 0
49 LEDA 2214320 EmG 15 15 11.318 +43 09 34.99           ~ 16 0
50 LEDA 2214734 EmG 15 15 39.852 +43 10 42.53   16.88       ~ 12 1
51 MCG+07-31-048 SyG 15 15 56.3061737160 +43 10 00.480168228   16.0       ~ 58 0
52 Z 221-46 EmG 15 16 03.962 +43 09 36.51   15.7       ~ 41 2
53 MCG+07-31-051 EmG 15 16 39.570 +42 57 13.93   16.0       ~ 27 1
54 SDSS J151655.26+430633.6 EmG 15 16 55.281 +43 06 34.07           ~ 9 0
55 MCG+07-31-054 EmG 15 17 25.327 +42 57 23.25   17       ~ 16 0
56 LEDA 2205911 EmG 15 20 56.064 +42 46 31.76           ~ 33 0
57 LEDA 2210115 EmG 15 27 57.8697555984 +42 58 16.335295968           ~ 23 0
58 LEDA 91459 EmG 15 34 36.70641 +43 02 21.7621           ~ 18 0
59 Z 249-32 AGN 15 35 45.8256573144 +44 50 05.362731060   14.4       ~ 48 0
60 LEDA 214411 G 15 43 35.77223 +43 50 32.0750           ~ 15 0
61 Z 222-46 GiG 15 43 55.1003733624 +44 18 21.425323500   15.4       ~ 26 0
62 2MASX J15513686+4413349 LIN 15 51 36.9061796976 +44 13 35.090420340           ~ 20 0
63 LEDA 56496 G 15 57 44.7988115280 +41 42 34.187018112   15.65       ~ 27 0
64 Z 223-21 EmG 15 57 58.0516217784 +41 47 33.378050220   15.1       ~ 44 0
65 Z 223-25 LIN 15 59 57.1105952256 +41 28 39.988158456   15.2       ~ 42 0
66 Z 223-28 G 16 01 27.7986125784 +42 23 17.578381632   15.7       ~ 24 0
67 Z 223-29 SBG 16 02 16.6301334672 +42 55 00.890433840   14.7       ~ 49 0
68 Z 223-30 AGN 16 02 42.5717019456 +41 11 49.877531304   14.5       ~ 68 2
69 Z 223-40 Sy2 16 07 17.6112754656 +41 24 13.005193788   15.5       ~ 45 0
70 MCG+07-33-046 EmG 16 09 32.080 +40 03 46.82   17       ~ 11 0
71 Z 223-45 GiG 16 09 48.3123003672 +42 20 02.405948676   15.3       ~ 32 0
72 Z 223-48 LIN 16 10 43.8145029432 +41 08 54.784951116   15.3       ~ 51 0
73 MCG+07-33-058 EmG 16 19 31.902 +41 39 44.87   16       ~ 29 0
74 MCG+07-34-009 EmG 16 22 54.3585666648 +41 31 14.098921068   17       ~ 24 0
75 Z 224-11 AGN 16 23 22.8600969744 +41 39 04.401860868   15.3       ~ 51 0
76 Z 224-13 LIN 16 23 27.8048844192 +41 42 23.038112448   15.0       ~ 32 0
77 LEDA 58049 EmG 16 24 39.545 +41 01 11.82   16.0       ~ 19 0
78 Z 224-21 AGN 16 25 49.25712 +40 20 42.8204   15.3       ~ 75 0
79 Z 224-24 LIN 16 26 21.9181680264 +40 54 42.702496272   15.7       ~ 35 0
80 LEDA 200157 EmG 16 29 38.331 +40 14 07.47           ~ 25 0
81 UGC 10417 LIN 16 29 40.7868276240 +40 41 13.114300956   16.5       ~ 53 0
82 MCG+07-34-084 EmG 16 29 44.755 +41 46 42.15   16       ~ 13 0
83 Z 224-54 LIN 16 30 19.0515403824 +41 06 07.415250300   15.4       ~ 49 0
84 UGC 10459 EmG 16 35 07.884 +40 59 28.95   16.0       ~ 62 0
85 MCG+07-34-114 GiC 16 35 39.5197869648 +42 27 40.623125580   16       ~ 22 0
86 LEDA 2242967 EmG 16 36 56.1468611040 +44 22 44.341946292           ~ 26 0
87 Z 224-84 GiC 16 39 19.1723407512 +42 11 02.859467388   15.7       ~ 21 0
88 SDSS J164123.78+401307.7 G 16 41 23.77334 +40 13 07.6832           ~ 12 0
89 Z 224-95 GiC 16 43 10.4462256240 +42 11 34.083846492   15.3       ~ 45 0
90 LEDA 3129654 GiC 16 51 34.9218548976 +40 01 18.660979524           ~ 13 0

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