Discovery of a new X-ray pulsar, AX J0049-729, in the Small Magellanic Cloud with ASCA

被引：9

作者：

Yokogawa, J ^{[1
]}

Imanishi, K ^{[1
]}

Tsujimoto, M ^{[1
]}

Kohno, M ^{[1
]}

Koyama, K ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Sci, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 1999年 / 51卷 / 04期

关键词：

pulsars : individual (AX J0049-729); stars : neutron; X-Rays : stars;

D O I：

10.1093/pasj/51.4.547

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the results of two ASCA observations on an X-ray source, AX J0049-729 (= RX J0049.1-7250), in the Small Magellanic Cloud. A sinusoidal pulsation with a barycentric period of 74.676 +/- 0.022 s was found. The pulse fraction was similar to 70%, independent of the X-ray energy. The spectrum was hard with an absorbed power-law having a photon index of similar to 1. The X-ray flux was 1.1 x 10(-11) erg s(-1) cm(-2), and then declined to 1.6 x 10(-12) s(-1) cm(-2) from the first to the second observations separated by about one month. Together with the previous results of the Einstein and ROSAT satellites, we found that AX J0049-729 has been in quiescent states, but occasionally showing flare activities. The flux variability, long-pulse period, and hard spectrum support the idea that AX J0049-729 is an X-ray binary pulsar, most likely a Be star binary.

引用

页码：547 / 551

页数：5

共 17 条

[1] Observations of accreting pulsars [J].

Bildsten, L ;

Chakrabarty, D ;

Chiu, J ;

Finger, MH ;

Koh, DT ;

Nelson, RW ;

Prince, TA ;

Rubin, BC ;

Scott, DM ;

Stollberg, M ;

Vaughan, BA ;

Wilson, CA ;

Wilson, RB .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1997, 113 (02) :367-408

[2] CCD SOFT-X-RAY IMAGING SPECTROMETER FOR THE ASCA SATELLITE [J].

BURKE, BE ;

MOUNTAIN, RW ;

DANIELS, PJ ;

COOPER, MJ ;

DOLAT, VS .

IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 1994, 41 (01) :375-385

[3]

CORBET RHD, 1984, ASTRON ASTROPHYS, V141, P91

[4]

CORBET RHD, 1997, 6803 IAU

[5] Magellanic cloud X-ray sources observed with ROSAT [J].

Cowley, AP ;

Schmidtke, PC ;

McGrath, TK ;

Ponder, AL ;

Fertig, MR ;

Hutchings, JB ;

Crampton, D .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1997, 109 (731) :21-38

[6]

GOTTHELF EV, 1997, XRAY IMAGING SPECTRO, P631

[7]

Kahabka P, 1996, ASTRON ASTROPHYS, V312, P919

[8] A ROSAT PSPC X-ray survey of the small magellanic cloud [J].

Kahabka, P ;

Pietsch, W ;

Filipovic, MD ;

Haberl, F .

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1999, 136 (01) :81-94

[9]

KAHABKA P, 1998, 6840 IAU

[10] THE MAGELLANIC SYSTEM [J].

MATHEWSON, DS .

PROCEEDINGS ASTRONOMICAL SOCIETY OF AUSTRALIA, 1985, 6 (01) :104-109

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