DISCOVERY OF 111 2ND PULSATION FROM THE X-RAY SOURCE SCUTUM X-1

被引：17

作者：

KOYAMA, K

KUNIEDA, H

TAKEUCHI, Y

TAWARA, Y

机构：

[1] Department of Astrophysics, School of Science, Nagoya University, Chikusa-ku, Nagoya 464-01, Furo-cho

来源：

ASTROPHYSICAL JOURNAL | 1991年 / 370卷 / 02期

关键词：

PULSARS; X-RAYS; SOURCES; SPECTRA;

D O I：

10.1086/185981

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have discovered a 111 s period X-ray pulsation from Sct X-1. The pulse profile was found to exhibit double peaks. The X-ray spectrum of Sct X-1 is fitted by a single power-law function with a photon index of about 1.9. Evidence for extremely large absorption (greater than 10(23) H cm-2) has been found in the low-energy band and near the iron K-edge. When combined with the previous observations, we find that the X-ray flux has been variable over more than two orders of magnitude.

引用

页码：L77 / L79

页数：3

共 15 条

[1] GINGA OBSERVATIONS OF 3 X-RAY-LUMINOUS EARLY-TYPE GALAXIES - NGC-4472, NGC-4636, AND NGC-3998 [J].

AWAKI, H ;

KOYAMA, K ;

KUNIEDA, H ;

TAKANO, S ;

TAWARA, Y ;

OHASHI, T .

ASTROPHYSICAL JOURNAL, 1991, 366 (01) :88-94

[2]

CHARLES PA, 1975, ASTROPHYS LETT COMM, V16, P145

[3]

HAYASHIDA K, 1989, PUBL ASTRON SOC JPN, V41, P373

[4] UNUSUAL X-RAY SOURCE IN SCUTUM [J].

HILL, R ;

BURGINYON, G ;

GRADER, R ;

TOOR, A ;

STOERING, J ;

SEWARD, F .

ASTROPHYSICAL JOURNAL, 1974, 189 (02) :L69-L70

[5]

KOYAMA K, 1989, PUBL ASTRON SOC JPN, V41, P665

[6]

KOYAMA K, 1986, PUBL ASTRON SOC JPN, V38, P121

[7] IS THE 5-KPC GALACTIC ARM A COLONY OF X-RAY PULSARS [J].

KOYAMA, K ;

KAWADA, M ;

KUNIEDA, H ;

TAWARA, Y ;

TAKEUCHI, Y ;

YAMAUCHI, S .

NATURE, 1990, 343 (6254) :148-149

[8]

MAKINO F, 1987, ASTROPHYS LETT COMM, V25, P223

[9] NEW HARD X-RAY SOURCES OBSERVED WITH HEAO-A-2 [J].

MARSHALL, FE ;

BOLDT, EA ;

HOLT, SS ;

MUSHOTZKY, RF ;

PRAVDO, SH ;

ROTHSCHILD, RE ;

SERLEMITSOS, PJ .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1979, 40 (03) :657-665

[10] INTERSTELLAR PHOTOELECTRIC ABSORPTION CROSS-SECTIONS, 0.03-10 KEV [J].

MORRISON, R ;

MCCAMMON, D .

ASTROPHYSICAL JOURNAL, 1983, 270 (01) :119-122

← 1 2 →