2025ApJ...983..112K

Query : 2025ApJ...983..112K

2025ApJ...983..112K - Astrophys. J., 983, 112 (2025/April-3)

Multiwavelength Evidence for Two New Candidate Transitional Millisecond Pulsars in the Subluminous Disk State: 4FGL J0639.1-8009 and 4FGL J1824.2+1231.

KYER R., ROY S., STRADER J., URQUHART R., MOLINA I., CRAIG P. and CHOMIUK L.

Abstract (from CDS):

We report the discovery of two new Galactic accreting compact objects consistent with the respective positions of the unassociated Fermi-LAT γ-ray sources 4FGL J0639.1-8009 and 4FGL J1824.2+1231. A combination of new and archival X-ray data from Chandra, XMM-Newton, Swift/XRT, and eROSITA reveals a variable X-ray source in each γ-ray error ellipse. Both candidate counterparts show power-law spectra with photon indices Γ ∼ 1.7-1.9. Optical follow-up photometry and spectroscopy show rapid high-amplitude variability unrelated to orbital motion and persistent accretion disk spectra for both objects. We demonstrate that the properties of these X-ray/optical sources are at odds with the known phenomenology of accreting white dwarfs, but are consistent with the observed properties of the subluminous disk state of transitional millisecond pulsars. This brings the census of confirmed or candidate transitional millisecond pulsars in the Galactic field to nine. We show this potentially represents ≲10% of the total population of transitional millisecond pulsars within 8 kpc.

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

Journal keyword(s): Millisecond pulsars - Compact binary stars

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 16

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Number of rows : 16
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 1RXS J040729.8-570019 Psr 04 07 31.7205701762 -57 00 25.287712501           ~ 19 0
2 SWIFT J0428.2-6704A LXB 04 27 49.6119608221 -67 04 35.066804919           ~ 76 1
3 2FGL J0540.1-7554 Bz? 05 40 01.5 -75 52 42           ~ 28 0
4 2CXO J063719.7-801230 AGN 06 37 19.750196 -80 12 30.55804           ~ 1 0
5 1RXS J064103.9-801135 Psr 06 40 59.5272118533 -80 11 25.949943679           ~ 6 0
6 PSR J1023+0038 Psr 10 23 47.6841824712 +00 38 41.005893516     17.31     GV 470 0
7 PSR J1025-07 Psr 10 24 38.6991893112 -07 19 19.045523388     19.81 18.78 18.00 ~ 286 1
8 CXOU J110926.4-650224 X 11 09 26.43 -65 02 25.0           ~ 23 0
9 XSS J12270-4859 Psr 12 27 58.7476831464 -48 53 42.824592960           ~ 321 0
10 1FGL J1544.5-1127 Psr 15 44 14.33 -11 24 42.0           ~ 70 0
11 V* DQ Her CV* 18 07 30.2510391864 +45 51 32.564791872   14.605 14.443 14.800   M3+Ve 1048 1
12 PSO J276.0370+12.5425 Psr 18 24 08.8915474213 +12 32 33.590077740           ~ 10 0
13 IGR J18245-2452 LXB 18 24 32.50 -24 52 07.8           ~ 253 0
14 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 821 0
15 V* MV Lyr CV* 19 07 16.2886463256 +44 01 07.869892008   13.040 12.920 12.489 12.578 M5Ve 307 0
16 GD 1662 CV* 23 29 00.4713595416 -29 46 45.980660100   13.054 12.980 13.099   OBe 191 0

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