The Orbit of NGC 5907 ULX-1

被引：3

作者：

Belfiore, Andrea ^{[1
]}

Salvaterra, Ruben ^{[1
]}

Sidoli, Lara ^{[1
]}

Israel, Gian Luca ^{[2
]}

Stella, Luigi ^{[2
]}

De Luca, Andrea ^{[1
]}

Mereghetti, Sandro ^{[1
]}

Esposito, Paolo ^{[1
,3
]}

Pintore, Fabio ^{[4
]}

D'Ai, Antonino ^{[4
]}

Rodriguez Castillo, Guillermo ^{[4
]}

Walton, Dominic J. ^{[5
,6
]}

Fuerst, Felix ^{[7
]}

Magistrali, Danilo ^{[8
]}

Wolter, Anna ^{[9
]}

Imbrogno, Matteo ^{[2
,10
,11
]}

机构：

[1] INAF, Ist Astrofis Spaziale & Fis Cosm, Via Alfonso Corti 12, I-20133 Milan, Italy

[2] INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy

[3] Scuola Univ Super IUSS Pavia, Piazza Vittoria 15, I-27100 Pavia, Italy

[4] INAF, Ist Astrofis Spaziale & Fis Cosm, Via Ugo La Malfa 153, I-90146 Palermo, Italy

[5] Univ Hertfordshire, Ctr Astrophys Res, Coll Lane, Hatfield AL10 9AB, Herts, England

[6] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[7] European Space Agcy ESA, European Space Astron Ctr ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain

[8] Univ Pontificia Comillas Madrid ICAI, Calle Alberto Aguilera 25, Madrid 28015, Spain

[9] INAF, Osservatorio Astron Brera, Via Brera 28, I-20121 Milan, Italy

[10] Univ Roma Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome, Italy

[11] Univ Roma La Sapienza, Piazzale Aldo Moro 5, I-00185 Rome, Italy

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 965卷 / 01期

关键词：

X-RAY SOURCE; RX J0209.6-7427; XMM-NEWTON; PULSAR; MASS; PERIOD; DISCOVERY; STARS; PULSATIONS; EVOLUTION;

D O I：

10.3847/1538-4357/ad320a

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the orbit of the binary system powering the most extreme ultraluminous X-ray pulsar known to date: NGC 5907 ULX-1 (hereafter ULX1). ULX1 has been the target of a substantial multi-instrument campaign, mainly in the X-ray band, but no clear counterparts are known in other bands. Although ULX1 is highly variable and pulsations can be transient (regardless of the source flux), the timing data collected so far allow us to investigate the orbit of this system. We find an orbital period P-orb = 5.7(-0.6)(+0.1) days and a projected semi-axis A(1) = 3.1(-0.9)(+0.8) lt-s . The most likely ephemeris is P-orb = 5.6585(6) days, A(1) = 3.1(4) lt-s, and the epoch of ascending nodes passage is T-asc = 57751.37(5) MJD. However, there are six similar solutions acceptable within 3 sigma. We find further indications that ULX1 is a high-mass X-ray binary. This implies that we are observing its orbit face on, with an inclination <5(degrees).

引用

页数：8

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