The Orbit of NGC 5907 ULX-1
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...
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| Veröffentlicht in: | The Astrophysical journal 2024-04, Vol.965 (1), p.78 |
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| creator | Belfiore, Andrea Salvaterra, Ruben Sidoli, Lara Israel, Gian Luca Stella, Luigi De Luca, Andrea Mereghetti, Sandro Esposito, Paolo Pintore, Fabio D’Aì, Antonino Rodrìguez Castillo, Guillermo Walton, Dominic J. Fürst, Felix Magistrali, Danilo Wolter, Anna Imbrogno, Matteo |
| description | 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
σ
. 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 |
| doi_str_mv | 10.3847/1538-4357/ad320a |
| format | Article |
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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
σ
. 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°.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/ad320a</identifier><language>eng</language><publisher>Philadelphia: The American Astronomical Society</publisher><subject>High mass x-ray binary stars ; High time resolution astrophysics ; Nautical almanacs ; Orbit determination ; Orbits ; Pulsars ; Ultraluminous x-ray sources ; X ray binaries ; X ray stars ; X-ray astronomy ; X-rays</subject><ispartof>The Astrophysical journal, 2024-04, Vol.965 (1), p.78</ispartof><rights>2024. The Author(s). Published by the American Astronomical Society.</rights><rights>2024. The Author(s). Published by the American Astronomical Society. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c398t-d96ce50e3f374f19d3f7d431b7f13fa4836a87dcbb60ca730bec716587394dcc3</cites><orcidid>0000-0002-5042-1036 ; 0000-0001-5819-3552 ; 0000-0003-0388-0560 ; 0000-0002-0018-1687 ; 0000-0003-3259-7801 ; 0000-0001-5840-9835 ; 0000-0001-5480-6438 ; 0000-0002-2526-1309 ; 0000-0001-9705-2883 ; 0000-0002-9393-8078 ; 0000-0003-4849-5092 ; 0000-0003-3952-7291 ; 0000-0002-3869-2925 ; 0000-0001-8688-9784 ; 0000-0001-6337-2184 ; 0000-0001-6739-687X</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/1538-4357/ad320a/pdf$$EPDF$$P50$$Giop$$Hfree_for_read</linktopdf><link.rule.ids>314,776,780,860,2096,27901,27902,38867,53842</link.rule.ids></links><search><creatorcontrib>Belfiore, Andrea</creatorcontrib><creatorcontrib>Salvaterra, Ruben</creatorcontrib><creatorcontrib>Sidoli, Lara</creatorcontrib><creatorcontrib>Israel, Gian Luca</creatorcontrib><creatorcontrib>Stella, Luigi</creatorcontrib><creatorcontrib>De Luca, Andrea</creatorcontrib><creatorcontrib>Mereghetti, Sandro</creatorcontrib><creatorcontrib>Esposito, Paolo</creatorcontrib><creatorcontrib>Pintore, Fabio</creatorcontrib><creatorcontrib>D’Aì, Antonino</creatorcontrib><creatorcontrib>Rodrìguez Castillo, Guillermo</creatorcontrib><creatorcontrib>Walton, Dominic J.</creatorcontrib><creatorcontrib>Fürst, Felix</creatorcontrib><creatorcontrib>Magistrali, Danilo</creatorcontrib><creatorcontrib>Wolter, Anna</creatorcontrib><creatorcontrib>Imbrogno, Matteo</creatorcontrib><title>The Orbit of NGC 5907 ULX-1</title><title>The Astrophysical journal</title><addtitle>APJ</addtitle><addtitle>Astrophys. J</addtitle><description>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
σ
. We find further indications that ULX1 is a high-mass X-ray binary. 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J</addtitle><date>2024-04-01</date><risdate>2024</risdate><volume>965</volume><issue>1</issue><spage>78</spage><pages>78-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>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
σ
. 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°.</abstract><cop>Philadelphia</cop><pub>The American Astronomical Society</pub><doi>10.3847/1538-4357/ad320a</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-5042-1036</orcidid><orcidid>https://orcid.org/0000-0001-5819-3552</orcidid><orcidid>https://orcid.org/0000-0003-0388-0560</orcidid><orcidid>https://orcid.org/0000-0002-0018-1687</orcidid><orcidid>https://orcid.org/0000-0003-3259-7801</orcidid><orcidid>https://orcid.org/0000-0001-5840-9835</orcidid><orcidid>https://orcid.org/0000-0001-5480-6438</orcidid><orcidid>https://orcid.org/0000-0002-2526-1309</orcidid><orcidid>https://orcid.org/0000-0001-9705-2883</orcidid><orcidid>https://orcid.org/0000-0002-9393-8078</orcidid><orcidid>https://orcid.org/0000-0003-4849-5092</orcidid><orcidid>https://orcid.org/0000-0003-3952-7291</orcidid><orcidid>https://orcid.org/0000-0002-3869-2925</orcidid><orcidid>https://orcid.org/0000-0001-8688-9784</orcidid><orcidid>https://orcid.org/0000-0001-6337-2184</orcidid><orcidid>https://orcid.org/0000-0001-6739-687X</orcidid><oa>free_for_read</oa></addata></record> |
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| source | IOP Publishing Free Content; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | High mass x-ray binary stars High time resolution astrophysics Nautical almanacs Orbit determination Orbits Pulsars Ultraluminous x-ray sources X ray binaries X ray stars X-ray astronomy X-rays |
| title | The Orbit of NGC 5907 ULX-1 |
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