TY - JOUR
T1 - Discovery and Identification of MAXI J1621-501 as a Type i X-Ray Burster with a Super-orbital Period
AU - Gorgone, Nicholas M.
AU - Kouveliotou, Chryssa
AU - Negoro, Hitoshi
AU - Wijers, Ralph A.M.J.
AU - Bozzo, Enrico
AU - Guiriec, Sylvain
AU - Bult, Peter
AU - Huppenkothen, Daniela
AU - Göǧüş, Ersin
AU - Bahramian, Arash
AU - Kennea, Jamie
AU - Linford, Justin D.
AU - Miller-Jones, James
AU - Baring, Matthew G.
AU - Beniamini, Paz
AU - Chakrabarty, Deepto
AU - Granot, Jonathan
AU - Hailey, Charles
AU - Harrison, Fiona A.
AU - Hartmann, Dieter H.
AU - Iwakiri, Wataru
AU - Kaper, Lex
AU - Kara, Erin
AU - Mazzola, Simona
AU - Murata, Katsuhiro
AU - Stern, Daniel
AU - Tomsick, John A.
AU - Horst, Alexander J.Van Der
AU - Younes, George A.
N1 - Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved..
PY - 2019/10/20
Y1 - 2019/10/20
N2 - MAXI J1621-501 is the first Swift/XRT Deep Galactic Plane Survey transient that was followed up with a multitude of space missions (NuSTAR, Swift, Chandra, NICER, INTEGRAL, and MAXI) and ground-based observatories (Gemini, IRSF, and ATCA). The source was discovered with MAXI on 2017 October 19 as a new, unidentified transient. Further observations with NuSTAR revealed two Type I X-ray bursts, identifying MAXI J1621-501 as a low mass x-ray binary with a neutron star primary. Overall, 24 Type I bursts were detected from the source during a 15 month period. At energies below 10 keV, the source spectrum was best fit with three components: an absorbed blackbody with kT = 2.3 keV, a cutoff power law with index Γ = 0.7, and an emission line centered on 6.3 keV. Timing analysis of the X-ray persistent emission and burst data has not revealed coherent pulsations from the source or an orbital period. We identified, however, a super-orbital period ∼78 days in the source X-ray light curve. This period agrees very well with the theoretically predicted radiative precession period of ∼82 days. Thus, MAXI J1621-501 joins a small group of sources characterized with super-orbital periods.
AB - MAXI J1621-501 is the first Swift/XRT Deep Galactic Plane Survey transient that was followed up with a multitude of space missions (NuSTAR, Swift, Chandra, NICER, INTEGRAL, and MAXI) and ground-based observatories (Gemini, IRSF, and ATCA). The source was discovered with MAXI on 2017 October 19 as a new, unidentified transient. Further observations with NuSTAR revealed two Type I X-ray bursts, identifying MAXI J1621-501 as a low mass x-ray binary with a neutron star primary. Overall, 24 Type I bursts were detected from the source during a 15 month period. At energies below 10 keV, the source spectrum was best fit with three components: an absorbed blackbody with kT = 2.3 keV, a cutoff power law with index Γ = 0.7, and an emission line centered on 6.3 keV. Timing analysis of the X-ray persistent emission and burst data has not revealed coherent pulsations from the source or an orbital period. We identified, however, a super-orbital period ∼78 days in the source X-ray light curve. This period agrees very well with the theoretically predicted radiative precession period of ∼82 days. Thus, MAXI J1621-501 joins a small group of sources characterized with super-orbital periods.
UR - http://www.scopus.com/inward/record.url?scp=85075117054&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/ab3e43
DO - 10.3847/1538-4357/ab3e43
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AN - SCOPUS:85075117054
SN - 0004-637X
VL - 884
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 168
ER -