2008A&A...488..267M


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.30CEST10:41:09

2008A&A...488..267M - Astronomy and Astrophysics, volume 488, 267-270 (2008/9-2)

Near infrared VLT/MAD observations of the isolated neutron stars RX J0420.0-5022 and RX J1856.5-3754.

MIGNANI R.P., FALOMO R., MORETTI A., TREVES A., TUROLLA R., SARTORE N., ZANE S., ARCIDIACONO C., LOMBINI M., FARINATO J., BARUFFOLO A., RAGAZZONI R. and MARCHETTI E.

Abstract (from CDS):

High-energy observations have unveiled peculiar classes of isolated neutron stars which, at variance with radio pulsars, are mostly radio silent and not powered by the star rotation. Among these objects are the magnetars, hyper-magnetized neutron stars characterized by transient X-ray/γ-ray emission, and neutron stars with purely thermal, and in most cases stationary, X-ray emission (a.k.a., X-ray dim isolated neutron stars or XDINSs). While apparently dissimilar in their high-energy behavior and age, both magnetars and XDINSs have similar periods and unusually high magnetic fields. This suggests a tantalizing scenario where the former evolve into the latter. Discovering so far uninvestigated similarities between the multi-wavelength properties of these two classes would be a further step forward to establish an evolutionary scenario. A most promising channels is the near infrared (NIR) one, where magnetars are characterized by a distinctive spectral flattening with respect to the extrapolation of the soft X-ray spectrum. We observed the two XDINSs RX J0420.0-5022 and RX J1856.5-3754 with the Multi-Conjugate Adaptive Optics Demonstrator (MAD) at the Very Large Telescope (VLT), as part of the instrument guaranteed time observations program, to search for their NIR counterparts. Both RX J1856.5-3754 and RX J0420.0-5022 were not detected down to Ks∼20 and Ks∼21.5, respectively. In order to constrain the relation between XDINSs and magnetars it would be of importance to perform deeper NIR observations. A good candidate is 1RXS J214303.7+065419 which is the XDINS with the highest inferred magnetic field.

Abstract Copyright:

Journal keyword(s): stars: neutron

Nomenclature: Fig.1: [MFM2008b] RX J0420.0-5022 A (Nos B-D).

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 - 2020
#notes
1 ESO 202-8 G 04 19 59.410 -50 22 00.82   16.50   14.75   ~ 10 0
2 RX J0420.0-5022 N*? 04 20 02.2 -50 22 46     25.5     ~ 77 0
3 CMS 30 * 08 56 34.899 -37 54 24.11   19.61 18.92     ~ 10 0
4 PSR J1119-6127 Psr 11 19 14.30 -61 27 49.5           ~ 315 1
5 RX J1856.6-3754 N* 18 56 35.11 -37 54 30.5     25.7     ~ 387 0
6 CMS 23 * 18 56 35.1855 -37 54 36.142     24.41     ~ 9 0
7 CMS 15 * 18 56 35.221 -37 54 46.66   19.39 18.72     ~ 10 0
8 CMS 27 * 18 56 35.408 -37 54 27.76   22.03 21.18     ~ 11 0
9 WWN C * 18 56 35.455 -37 54 49.84   17.2 18.21 16.6 16.89 G6/8III/V 10 0
10 [W2001] 106 ? 18 56 35.5512 -37 54 25.310   23.13       ~ 5 0
11 [W2001] 114 ? 18 56 35.9229 -37 54 31.175   24.66       ~ 5 0
12 RX J2143.0+0654 N*? 21 43 03.8 +06 54 20           ~ 70 0
13 CMS 21 * ~ ~   23.50 21.54     ~ 8 0
14 CMS 26 * ~ ~   23.07 21.84     ~ 7 0
15 CMS 24 * ~ ~   22.67 20.85     ~ 7 0
16 CMS 28 * ~ ~   23.05 22.05     ~ 8 0

    Equat.    Gal    SGal    Ecl

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2020.03.30-10:41:09

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