1996/11/12 by Tomaso Belloni, T. Belloni, Belloni, Tomaso +6 · 1 citation
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astrophysical Phenomena and Observations #Astrophysics (astro-ph) #FOS: Physical sciences #Geophysics and Sensor Technology #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9611087
11 pages, LaTeX, L-AA v. 3.0 Springer-Verlag style file, to appear in A&A
arxiv created 1996/11/12 · openalex publication_date 1996/11/12 · arxiv updated 2009/12/01 · openalex created_date 2022/10/04 · openalex updated_date 2026/07/28
We present the results of a systematic search for old isolated neutron stars\n(ONSs) in the direction of two giant molecular clouds in Cygnus (Rift and OB7).\nFrom theoretical calculations, we expect the detection of a large number of\nONSs with the PSPC on board ROSAT. By analyzing the PSPC pointings in the\ndirection of the clouds, we find four sources characterized by count rates\n(\∼ 10-3 c s-1) and spectral properties consistent with the\nhypothesis that the X--ray radiation is produced by ONSs and also characterized\nby the absence of any measurable optical counterpart within their error circle\nin the digitized red plates of the Palomar All Sky Survey. The importance of\nfollow--up deep observations in the direction of these ONS candidates is\ndiscussed. The observational and theoretical approach presented here could be\nfruitfully applied also to the systematic search for ONSs in other regions of\nthe Galaxy.\n