2011ApJ...742...77D

Query : 2011ApJ...742...77D

2011ApJ...742...77D - Astrophys. J., 742, 77 (2011/December-1)

Search for the optical counterpart to Sgr 0418+5729.

DURANT M., KARGALTSEV O. and PAVLOV G.G.

Abstract (from CDS):

We report broadband Hubble Space Telescope imaging of the field of soft γ-ray repeater SGR 0418+5729 with Advanced Camera for Surveys/Wide Field Channel and Wide Field Camera 3/IR. Observing in two wide filters, F606W and F110W, we find no counterpart within the positional error circle derived from Chandra observations, to limiting magnitudes mF606W> 28.6 and mF110W> 27.4 (Vega system), equivalent to reddening-corrected luminosity limits LF606W< 5x1028 and LF110W< 6x1028 erg/s for a distance d = 2 kpc, at 3σ confidence. This, in turn, imposes lower limits on the contemporaneous X-ray/optical flux ratio of ≃1100 and the X-ray/near-infrared flux ratio of ≃1000. We derive an upper limit on the temperature and/or size of any fall-back disk around the magnetar. We also compare the detection limits with observations of other magnetars.

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Journal keyword(s): stars: neutron - X-rays: individual: SGR 0418+5729

Nomenclature: Fig. 1, Table 1: [DKP2011] A (Nos A-I).

Simbad objects: 14

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Number of rows : 14
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 J0146+6145 Psr 01 46 22.21 +61 45 03.8   28.100 25.620     ~ 613 0
2 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
3 [DKP2011] E * 04 18 33.0932524632 +57 32 19.395765168     21.308     ~ 1 0
4 [DKP2011] C ? 04 18 33.261 +57 32 26.42     27.337     ~ 1 0
5 [DKP2011] F ? 04 18 33.805 +57 32 32.07     23.537     ~ 1 0
6 NAME Sgr J0418+5729 gam 04 18 33.867 +57 32 22.91           ~ 244 0
7 [DKP2011] B * 04 18 33.9170310816 +57 32 25.445351184     21.213     ~ 1 0
8 [DKP2011] D ? 04 18 33.935 +57 32 18.54     24.510     ~ 1 0
9 [DKP2011] A ? 04 18 34.037 +57 32 23.58     23.773     ~ 1 0
10 [DKP2011] H ? 04 18 34.229 +57 32 14.04     22.559     ~ 1 0
11 [DKP2011] G * 04 18 34.5939238056 +57 32 29.843959416     21.371     ~ 1 0
12 [DKP2011] I ? 04 18 34.647 +57 32 13.48     19.888     ~ 1 0
13 PSR J0501+4516 Psr 05 01 06.600 +45 16 33.96           ~ 142 0
14 2E 2336 HXB 10 50 08.93 -59 53 19.9           Be 419 0

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