2023MNRAS.525.2107J

Query : 2023MNRAS.525.2107J

2023MNRAS.525.2107J - Mon. Not. R. Astron. Soc., 525, 2107-2124 (2023/October-3)

Regimes in astrophysical lensing: refractive optics, diffractive optics, and the Fresnel scale.

JOW D.L., PEN U.-L. and FELDBRUGGE J.

Abstract (from CDS):

Astrophysical lensing has typically been studied in two regimes: diffractive optics and refractive optics. Previously, it has been assumed that the Fresnel scale, R_F, is the relevant physical scale that separates these two regimes. With the recent introduction of Picard-Lefschetz theory to the field of lensing, it has become possible to generalize the refractive description of discrete images to all wave parameters, and, in particular, exactly evaluate the diffraction integral at all frequencies. In this work, we assess the regimes of validity of refractive and diffractive approximations for a simple one-dimensional lens model through comparison with this exact evaluation. We find that, contrary to previous assumptions, the true separation scale between these regimes is given by $R_F/\sqrt{\kappa }$ , where κ is the convergence of the lens. Thus, when the lens is strong, refractive optics can hold for arbitrarily small scales. We also argue that intensity variations in diffractive optics are generically small, which has implications for the study of strong diffractive interstellar scintillation.

Abstract Copyright: © The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): waves - pulsars: general - radio continuum: ISM - fast radio bursts

Simbad objects: 1

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Number of rows : 1

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	PSR J1959+2048	Psr	19 59 36.7643141520	+20 48 14.896407996		21.08	20.16	19.53	18.79	G:	854	3

Query : 2023MNRAS.525.2107J

Basic data :

PSR J1959+2048 -- Pulsar

gam (1FGL,2FGL,...), Psr (2022ApJS,PSR), Pl? (2020ApJ), V* (V*), * (Gaia)

19 59 36.7643141520 +20 48 14.896407996 (Optical) [ 0.6353 0.7032 90 ] A 2020yCat.1350....0G

19 57 25.0391949060 +20 40 00.756655463 [ 0.6353 0.7032 90 ]

059.1968896728793 -04.6974899421032 [ 0.6353 0.7032 90 ]

-19.267 -26.560 [1.235 1.244 90] A 2020yCat.1350....0G

1.1878 [1.3556] A 2020yCat.1350....0G

G: E 1992ApJ...400..638A

B 21.08 [0.05] D 2007MNRAS.379.1117R

V 20.16 [0.05] D 2007MNRAS.379.1117R

R 19.53 [0.05] D 2007MNRAS.379.1117R

G 20.172272 [0.024249] C 2020yCat.1350....0G

I 18.79 [0.05] D 2007MNRAS.379.1117R

K 17.8 [0.1] D 2007MNRAS.379.1117R

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`PSR J1959+2048`	`3FGL J1959.5+2047`	`NAME PSR B1957+20 b`	`EQ J195936+204814`
`1FGL J1959.6+2047`	`4FGL J1959.5+2048`	`PSR B1957+20`	`Gaia DR3 1823773960079216896`
`2FGL J1959.5+2047`	`NAME Black Widow`	*`V QX Sge`**	`Gaia DR2 1823773960079216896`

References (854 between 1850 and 2026) (Total 854)
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V* QX Sge Gaia DR3 1823773960079216896 Gaia DR2 1823773960079216896

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