2025ApJ...981L..29L

Query : 2025ApJ...981L..29L

2025ApJ...981L..29L - Astrophys. J., 981, L29 (2025/March-2)

PSR J1922+37: a 1.9 s Pulsar Discovered in the Direction of the Old Open Cluster NGC 6791.

LIU X.-J., SENGAR R., BAILES M., EATOUGH R.P., YUAN J., WANG N., ZHU W., ZHOU L., GAO H., ZHU Z.-H. and ZHU X.-J.

Abstract (from CDS):

More than 300 pulsars have been discovered in Galactic globular clusters; however, none have been found in open clusters. Here we present results from a 20 hr survey of seven open clusters with the Five-hundred-meter Aperture Spherical radio Telescope. Our first discovery is a 1.9 s pulsar (J1922+37) found in the direction of the old open cluster NGC 6791. The measured dispersion measure (DM) implies a distance of 4.79 and 8.92 kpc based on the NE2001 and YMW16 electron density models, respectively. Given the large uncertainty of DM distance estimates, it is plausible that PSR J1922+37 is indeed a member of NGC 6791, for which the distance is 4.19 ± 0.02 kpc based on Gaia Data Release 3. If confirmed, PSR J1922+37 will be the first pulsar found in a Galactic open cluster. We outline future observations that can confirm this pulsar-open cluster association and discuss the importance of this pulsar for calibrating the characteristic ages of the pulsar population.

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

Journal keyword(s): Radio pulsars - Open star clusters - Globular star clusters

Simbad objects: 31

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Number of rows : 31
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 IC 166 OpC 01 52 21.3 +61 51 29   13.0 11.7     ~ 98 0
3 M 38 OpC 05 28 40.0 +35 49 08   6.69 6.4     ~ 184 2
4 M 37 OpC 05 52 18.6 +32 32 36           ~ 436 0
5 NGC 2158 OpC 06 07 26.7 +24 05 53           ~ 317 0
6 NGC 2168 OpC 06 09 07.5 +24 20 15           ~ 604 0
7 Cl Trumpler 5 OpC 06 36 31.8 +09 28 03           ~ 146 0
8 Cl VDBH 33 OpC 08 31 20.4 -38 38 16           ~ 48 0
9 Cl Trumpler 20 OpC 12 39 33.0 -60 38 10           ~ 138 0
10 Cl Westerlund 1 OpC 16 47 02.4 -45 51 07           ~ 655 1
11 PSR J1647-4552 Psr 16 47 10.18 -45 52 16.7           ~ 217 1
12 NGC 6259 OpC 17 00 47.5 -44 40 54   8.85 8.0     ~ 92 0
13 PSR B1718-19 Psr 17 21 01.48 -19 36 51.0           ~ 97 1
14 NGC 6342 GlC 17 21 10.14 -19 35 14.7     10.01     ~ 310 0
15 IC 4665 OpC 17 46 04.0 +05 36 54           ~ 407 0
16 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
17 [KC2019] Theia 1661 As* 17 55 18 -25 22.0           ~ 2 0
18 NGC 6517 GlC 18 01 50.376 -08 57 34.39   11.08       ~ 215 0
19 PSR J1801-0857D Psr 18 01 55.3653 -08 57 24.330           ~ 15 0
20 PSR J1823-3022 Psr 18 23 27.27 -30 22 35.0           ~ 5 0
21 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
22 PSR J1837+0528g Psr 18 37 32 +05 29.0           ~ 2 0
23 IC 4756 OpC 18 38 39.0 +05 26 14           ~ 274 0
24 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
25 PSR J1910-5959A Psr 19 11 42.7562 -59 58 26.900 22.02 22.13 22.03     DA5 99 1
26 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
27 PSR J1922+37 Psr 19 22 03.0 +37 46 13           ~ 3 0
28 PSR B1929+10 Psr 19 32 14.0570 +10 59 33.380           ~ 801 0
29 Cl Berkeley 53 OpC 20 55 54.8 +51 03 30           ~ 43 0
30 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
31 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0

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