2012A&A...543A.122C


Query : 2012A&A...543A.122C

2012A&A...543A.122C - Astronomy and Astrophysics, volume 543A, 122-122 (2012/7-1)

Search for radio pulsations in LS I +61 303.

CANELLAS A., JOSHI B.C., PAREDES J.M., ISHWARA-CHANDRA C.H., MOLDON J., ZABALZA V., MARTI J. and RIBO M.

Abstract (from CDS):

object{LS I +61 303} is a member of the select group of gamma-ray binaries: galactic binary systems that contain a massive star and a compact object, show a changing milliarcsecond morphology and a similar broad spectral energy distribution (SED) that peaks at MeV-TeV energies and is modulated by the orbital motion. The nature of the compact object is unclear in LS I +61 303, LS 5039 and HESS J0632+057, whereas PSR B1259-63 harbours a 47.74ms radio pulsar. A scenario in which a young pulsar wind interacts with the stellar wind has been proposed to explain the very high energy (VHE, E>100GeV) gamma-ray emission detected from LS I +61 303, although no pulses have been reported from this system at any wavelength. We aim to find evidence of the pulsar nature of the compact object. We performed phased array observations with the Giant Metrewave Radio Telescope at 1280MHz centred at phase 0.54. Simultaneous data from the multi-bit phased array back-end with a sampling time of tsamp=128µs and from the polarimeter back-end with tsamp=256µs where taken. No pulses have been found in the data set, with a minimum detectable mean flux density of ∼0.38mJy at 8-σ level for the pulsed emission from a putative pulsar with period P>2ms and duty cycle D=10% in the direction of LS I +61 303. The detection of posible radio pulsations will require deep and sensitive observations at frequencies ∼0.5-5GHz and orbital phases 0.6-0.7. However, it may be unfeasible to detect pulses if the putative pulsar is not beamed at the Earth or if there is a strong absorption within the binary system.

Abstract Copyright:

Journal keyword(s): binaries: close - gamma rays: stars - pulsars: general - radio continuum: stars - stars: individual: LS I +61 303 - X-rays: binaries

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2696 2
2 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 807 2
3 PSR B0329+54 Psr 03 32 59.3370698592 +54 34 45.028206408           ~ 609 1
4 HD 259440 HXB 06 32 59.2566076656 +05 48 01.160755848 9.17 9.63 9.15     B0pe 206 0
5 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 733 0
6 V* V479 Sct HXB 18 26 15.0561548880 -14 50 54.247274304 12.02 12.23 11.27 11.04   ON6V((f))z 535 2
7 PSR B1937+21 Psr 19 39 39.6 +21 37 22           ~ 1025 2
8 PSR B2022+50 Psr 20 23 41.9427 +50 37 34.858           ~ 39 0
9 PSR J2037+3621 Psr 20 37 27.44 +36 21 24.1           ~ 44 0

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2022.09.26-09:05:56

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