2015A&A...575L...9M


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST23:21:47

2015A&A...575L...9M - Astronomy and Astrophysics, volume 575, L9-9 (2015/3-1)

Long-term OVRO monitoring of LS I +61°303: confirmation of the two close periodicities.

MASSI M., JARON F. and HOVATTA T.

Abstract (from CDS):

The gamma-ray binary LS I +61°303 shows multiple periodicities. The timing analysis of 6.7yr of GBI radio data and of 6yr of Fermi-LAT GeV gamma-ray data both have found two close periodicities P1,GBI=26.49±0.07d, P2,GBI=26.92±0.07d and P1,γ=26.48±0.08d, P2,γ=26.99±0.08d. The system LS I +61°303 is the object of several continuous monitoring programs at low and high energies. The frequency difference between ν1 and ν2 of only 0.0006d–1 requires long-term monitoring because the frequency resolution in timing analysis is related to the inverse of the overall time interval. The Owens Valley Radio Observatory (OVRO) 40m telescope has been monitoring the source at 15GHz for five years and overlaps with Fermi-LAT monitoring. The aim of this work is to establish whether the two frequencies are also resolved in the OVRO monitoring. We analysed OVRO data with the Lomb-Scargle method. We also updated the timing analysis of Fermi-LAT observations. The periodograms of OVRO data confirm the two periodicities P1,OVRO= 26.5±0.1d and P2,x OVRO= 26.9±0.1d. The three independent measurements of P1 and P2 with GBI, OVRO, and Fermi-LAT observations confirm that the periodicities are permanent features of the system LS I +61°303. The similar behaviours of the emission at high (GeV) and low (radio) energy when the compact object in LS I +61°303 is toward apastron suggest that the emission is caused by the same periodically (P1) ejected population of electrons in a precessing (P2) jet.

Abstract Copyright:

Journal keyword(s): radio continuum: stars - X-rays: binaries - X-rays: individuals: LSI +61 303 - gamma rays: stars

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 LS I +61 303 HXB 02 40 31.6641883136 +61 13 45.591138110 11.27 11.61 10.75 10.19 9.55 B0Ve 777 2
2 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3858 2
3 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1751 1
4 SS 433 HXB 19 11 49.5645897700 +04 58 57.824087535   16.3 13.0     A7Ib: 1961 4

    Equat.    Gal    SGal    Ecl

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2021.04.19-23:21:47

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