2004A&A...417.1017Z


Query : 2004A&A...417.1017Z

2004A&A...417.1017Z - Astronomy and Astrophysics, volume 417, 1017-1030 (2004/4-3)

Multiband optical observations of the old PSR B0950+08.

ZHARIKOV S.V., SHIBANOV Y.A., MENNICKENT R.E., KOMAROVA V.N., KOPTSEVICH A.B. and TOVMASSIAN G.H.

Abstract (from CDS):

We report on deep UBVRI-imaging of the field of the 17.3 Myr radiopulsar PSR B0950+08 obtained with the ESO/VLT/FORS1. Firm detection of the candidate pulsar optical counterpart in the BVRI bands with the magnitudes B=27.06±0.35, V=27.05±0.15, Rc=26.49±0.10 and Ic=26.20±0.17 enabled us to study, for the first time, the broadband spectrum of the object. The derived ∼0.24" offset of the object from the radiopulsar position is insignificant within the 0.21" uncertainties of our astrometry and ∼0.75" seeing value during the observations. The positional coincidence and unusual colors of the candidate ensure us that we likely detect the optical emission from PSR B0950+08. The optical-near-UV spectrum of the pulsar has a negative slope and can be fitted by a power law Fν∝ν–α with α=0.65±0.40, suggesting nonthermal emission. Within errors the optical flux is consistent with the power law fit of the ROSAT spectrum from the X-ray counterpart. We analyze our results together with the available multiwavelength data on other isolated pulsars of different ages detected in the optical range and find a significant correlation between their optical and 2-10 keV X-ray luminosities. This implies an origin of the nonthermal emission in both spectral domains. These objects show a significantly non-monotonic evolution of the efficiency of the optical-X-ray photon production from the pulsar spindown power, with a pronounced minimum at the beginning of the middle-age epoch and comparably high efficiencies of younger and older pulsars. This suggests different sensitivities of the photon production processes to the Goldreich-Julian current in magnetospheres of different age pulsars.

Abstract Copyright:

Journal keyword(s): stars: pulsars: general - stars: pulsars: individual: PSR B0950+08 - stars: neutron

Simbad objects: 21

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Number of rows : 21
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 M 1 SNR 05 34 30.9 +22 00 53           ~ 6184 1
2 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5250 0
3 PSR B0540-69 Psr 05 40 11.2000490438 -69 19 54.198559829           ~ 904 3
4 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1219 0
5 PSR B0656+14 Psr 06 59 48.1960 +14 14 19.400   24.85 24.90     ~ 868 1
6 RL 149 HS* 07 24 14.3741784768 -00 33 04.165016904 12.958 13.737 13.866 13.906 13.974 sdB 112 0
7 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1229 2
8 PG 0942-029 HS* 09 45 11.8538082624 -03 09 21.034933164 12.537 13.714 14.012 14.144 14.308 sdB 53 0
9 USNO-B1.0 0979-00228656 * 09 53 03.5146229832 +07 54 51.064121988   20.9 20.1     ~ 1 0
10 USNO-B1.0 0979-00228669 PM* 09 53 06.3323777784 +07 55 33.141799020   20.3 20.3     ~ 1 0
11 USNO-B1.0 0979-00228673 * 09 53 06.8034530904 +07 56 34.853544744   20.7 19.9     ~ 1 0
12 USNO-B1.0 0979-00228679 * 09 53 07.76 +07 56 58.8   21.3       ~ 1 0
13 PSR B0950+08 Psr 09 53 09.2970 +07 55 36.400           ~ 755 2
14 USNO-B1.0 0979-00228696 * 09 53 10.7553791736 +07 54 47.907458532   19.0 18.8     ~ 1 0
15 USNO-B1.0 0979-00228699 PM* 09 53 11.7184243944 +07 55 01.925821812   21.4       ~ 1 0
16 USNO-B1.0 0979-00228707 * 09 53 12.48 +07 57 13.3   18.8       ~ 1 0
17 V* UY Sex HS* 10 50 02.8265487864 -00 00 36.879009588 12.063 13.184 13.474 13.606 13.769 sdO9VIIHe6 166 0
18 PSR B1055-52 Psr 10 57 59.0450 -52 26 56.330           ~ 724 0
19 PSR B1509-58 Psr 15 13 55.52 -59 08 08.8     13.06     ~ 844 1
20 PSR B1706-44 Psr 17 09 42.7460 -44 29 07.200     13.30     ~ 640 1
21 PSR B1929+10 Psr 19 32 14.0570 +10 59 33.380           ~ 753 0

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