Two black widow pulsars in the optical and X-rays | Astronomy & Astrophysics (A&A)

Home

All issues

Volume 690 (October 2024)

A&A, 690 (2024) A173

Full HTML

Open Access

Table 1.

J1513 and J2017 parameters obtained from Sanpa-arsa (2016), the ATNF catalogue, and the Third Fermi Large Area Telescope catalogue of γ-ray pulsars (Smith et al. 2023).

MSP	J2017	J1513
RA α (J2000)	20^h17^m46.^s1478(8)	15^h13^m23.^s32059(6)
Dec δ (J2000)	−16 ° 14′15.″51(5)	−25 ° 50′31.″285(3)
Galactic longitude l, deg	27.314	338.820
Galactic latitude b, deg	−26.220	26.964
Spin period P, ms	2.3142872649224(4)	2.1190675651177(1)
Period derivative $\dot{P}$ $\dot{P}$ , s s⁻¹	2.45(5) × 10⁻²¹	21.61(2) × 10⁻²¹
Orbital period P_b, d	0.0978252578(4)	0.1786354505(8)
Projected semi-major axis x, lt-s	0.043655(5)	0.0408132(7)
Epoch of ascending node T_asc, MJD	56704.756314(2)	56728.4539340(6)
Mass function f_M, M_⊙	9.334(3) × 10⁻⁶	2.2874(1) × 10⁻⁶
Dispersion measure DM, pc cm⁻³	25.4380(4)	46.86(7)
Distance D_YMW16, kpc	1.4	4.0
Distance D_NE2001, kpc	1.1	2.0
Characteristic age $τ_{c} \equiv P / 2 \dot{P}$ $\tau_c\equiv P/2\dot{P}$ , Gyr	15	1.55
Spin-down luminosity $\dot{E}$ $\dot{E}$ , erg s⁻¹	7.8 × 10³³	9.0 × 10³⁴
Minimum companion mass M_{c, min}, M_⊙	0.03	0.02

p.m. in RA direction μ_αcos δ, mas yr⁻¹	–	−6.3(1)
p.m. in Dec direction μ_δ, mas yr⁻¹	–	−3.5(4)

Notes. Numbers in parentheses denote 1σ uncertainties relating to the last significant digit.

D_YMW16 and D_NE2001 are dispersion measure distances derived using the YMW16 (Yao et al. 2017) and NE2001 (Cordes & Lazio 2002) models for the distribution of free electrons in the Galaxy, respectively. The minimum companion mass was calculated for the pulsar mass of M_p = 1.4 M_⊙ and orbital inclination of i = 90°. p.m. = proper motion.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.