2011A&A...525A.106D


Query : 2011A&A...525A.106D

2011A&A...525A.106D - Astronomy and Astrophysics, volume 525A, 106-106 (2011/1-1)

HST and VLT observations of the neutron star 1E 1207.4-5209.

DE LUCA A., MIGNANI R.P., SARTORI A., HUMMEL W., CARAVEO P.A., MEREGHETTI S. and BIGNAMI G.F.

Abstract (from CDS):

The peculiar central compact object 1E 1207.4-5209 in the G296.5+10.0 supernova remnant has been proposed to be an ``anti-magnetar'' - a young neutron star born with a weak dipole field. Accretion, possibly of supernova fallback material, has also been invoked to explain a large surface temperature anisotropy as well as the generation of peculiar cyclotron absorption features superimposed on its thermal spectrum. Interestingly enough, a faint optical/infrared source was proposed as a possible counterpart to 1E 1207.4-5209, but later questioned, based on coarse positional coincidence. On the basis of the large offset of 1E 1207.4-5209 with respect to the center of its host supernova remnant, the source should move at ∼70mas/yr. Thus, we tested the association by measuring the proper motion of the proposed optical counterpart. Using Hubble Space Telescope (HST) observations spanning 3.75 years, we computed a 3σ upper limit of 7mas/yr. Absolute astrometry on the same HST data set also places the optical source significantly off the 99% confidence Chandra position. This allows us to safely rule out the association. Using the HST data set, coupled to ground-based observations collected at the ESO/Very Large Telescope (VLT), we set the deepest limits ever obtained on the optical/infrared emission from 1E 1207.4-5209. By combining these limits with the constraints derived from X-ray timing, we rule out accretion as the source of the thermal anisotropy of the neutron star.

Abstract Copyright:

Journal keyword(s): stars: neutron - pulsars: individual: 1E 1207.4-5209

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 PSR J0146+6145 Psr 01 46 22.21 +61 45 03.8   28.100 25.620     ~ 580 0
2 PSR J0821-4300 Psr 08 21 58.2 -43 00 22           ~ 124 2
3 NAME Pup A SNR 08 24 07 -42 59.8           ~ 605 1
4 NAME Vela Jr SN SNR 08 52.0 -46 20           ~ 483 2
5 SNR G295.5+09.7 SNR 12 09 40 -52 25.0           ~ 292 1
6 PSR J1210-5226 Psr 12 10 00.88 -52 26 28.4           ~ 226 1
7 AJG 44 Psr 16 17 33.000 -51 02 00.00           ~ 515 3
8 2E 3623 X 16 17 36.30 -51 02 26.6           ~ 112 1
9 SNR G033.6+00.1 SNR 18 52 29.000 +00 38 42.00           ~ 287 2
10 PSR J1852+0040 Psr 18 52 38.5963516169 +00 40 20.164383034           ~ 91 1

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