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Title:
Discovery of an 11-s X-Ray Pulsar in the Galactic-Plane Section of the Scorpius Constellation
Authors:
Sugizaki, Mutsumi; Nagase, Fumiaki; Torii, Ken'ichi; Kinugasa, Kenzo; Asanuma, Tatsuhiko; Matsuzaki, Keiichi; Koyama, Katsuji; Yamauchi, Shigeo
Affiliation:
AA(The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229; E-mail(MS): ), AB(The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229; E-mail(MS): ), AC(The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229; E-mail(MS): ), AD(The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229; E-mail(MS): ), AE(Department of Earth and Space Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560), AF(Department of Physics, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113), AG(Department of Physics, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-01), AH(Faculty of Humanities and Social Sciences, Iwate University, 3-18-34 Ueda, Morioka, Iwate 020})
Publication:
Publ. of the Astronomical Society of Japan, v.49, p.L25-L30. (PASJ Homepage)
Publication Date:
10/1997
Origin:
PASJ
PASJ Keywords:
PULSARS, STARS: INDIVIDUAL (1RXS J1708490-400910), STARS: NEUTRON, X-RAY: SOURCES
Bibliographic Code:
1997PASJ...49L..25S

Abstract

During a galactic-plane survey with ASCA in 1996 September, we detected a relatively bright, soft source at R.A.=17() h8() m46. s6, DEC.=-40(deg) 9'27'' (J2000), and discovered an 11-s X-ray pulsation from the source. This source has been identified with the ROSAT source 1RXS J170849.0-400910. >From a timing analysis of the source, we obtained a barycentric pulse period of P = 10.99759 +/- 0.00005 s with a broad sinusoidal shape of a pulse fraction of ~ 30%. The energy spectrum in the 0.8--10 keV region is very soft, and can be fitted by a power-law model with a photon index of 3.5 and an absorption column density of 1.8times 10(22) cm(-2) . The observed pulse-phase-averaged flux in the range 0.8--10 keV is 4.3*E(-11) erg cm(-2) s(-1) , which corresponds to 1.7*E(-10) erg cm(-2) s(-1) after correcting for soft X-ray absorption. During an observation interval of about 14 hr, neither a significant change in the pulsation period, nor a significant variation in the phase-averaged flux was detected. >From these X-ray properties, we suggest that this newly discovered X-ray pulsar might be a member of a small subgroup of ``anomalous'' X-ray pulsars with a period close to 6--9 s.

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