Chandra Probes the X-Ray Variability of M51 ULX-7: Evidence of Propeller Transition and X-Ray Dips on Orbital Periods

被引：23

作者：

Vasilopoulos, Georgios ^{[1
]}

Koliopanos, Filippos ^{[2
,3
,4
]}

Haberl, Frank ^{[5
]}

Treiber, Helena ^{[1
,6
]}

Brightman, Murray ^{[7
]}

Earnshaw, Hannah P. ^{[7
]}

Gurpide, Andres ^{[2
,3
,4
]}

机构：

[1] Yale Univ, Dept Astron, POB 208101, New Haven, CT 06520 USA

[2] Univ Toulouse, F-31058 Toulouse, France

[3] UPS OMP, F-31058 Toulouse, France

[4] IRAP, F-31058 Toulouse, France

[5] Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany

[6] Amherst Coll, Dept Phys & Astron, C025 New Sci Ctr,25 East Dr, Amherst, MA 01002 USA

[7] CALTECH, Cahill Ctr Astron & Astrophys, 1216 East Calif Blvd, Pasadena, CA 91125 USA

来源：

ASTROPHYSICAL JOURNAL | 2021年 / 909卷 / 01期

关键词：

High mass x-ray binary stars; Neutron stars; Pulsars;

D O I：

10.3847/1538-4357/abda49

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the temporal properties of the ultraluminous X-ray (ULX) pulsar M51 ULX-7 inferred from the analysis of the 2018-2020 Swift/X-ray Telescope monitoring data and archival Chandra data obtained over a period of 33 days in 2012. We find an extended low flux state, which might be indicative of propeller transition, lending further support to the interpretation that the neutron star is rotating near equilibrium. Alternatively, this off-state could be related to a variable superorbital period. Moreover, we report the discovery of periodic dips in the X-ray light curve that are associated with the binary orbital period. The presence of the dips implies a configuration where the orbital plane of the binary is closer to an edge-on orientation, and thus demonstrates that favorable geometries are not necessary in order to observe ULX pulsars. These characteristics are similar to those seen in prototypical X-ray pulsars such as Her X-1 and SMC X-1 or other ULX pulsars such as NGC 5907 ULX1.

引用

页数：8

共 69 条

[1] Formation and Evolution of Ultraluminous X-Ray Pulsar Binaries to Pulsar-Neutron Star and Pulsar-White Dwarf Systems [J].

Abdusalam, K. ;

Ablimit, Iminhaji ;

Hashim, P. ;

Lu, G. -L ;

Mardini, M. K. ;

Wang, Z. -J .

ASTROPHYSICAL JOURNAL, 2020, 902 (02)

[2] An ultraluminous X-ray source powered by an accreting neutron star [J].

Bachetti, M. ;

Harrison, F. A. ;

Walton, D. J. ;

Grefenstette, B. W. ;

Chakrabarty, D. ;

Fuerst, F. ;

Barret, D. ;

Beloborodov, A. ;

Boggs, S. E. ;

Christensen, F. E. ;

Craig, W. W. ;

Fabian, A. C. ;

Hailey, C. J. ;

Hornschemeier, A. ;

Kaspi, V. ;

Kulkarni, S. R. ;

Maccarone, T. ;

Miller, J. M. ;

Rana, V. ;

Stern, D. ;

Tendulkar, S. P. ;

Tomsick, J. ;

Webb, N. A. ;

Zhang, W. W. .

NATURE, 2014, 514 (7521) :202-+

[3] All at Once: Transient Pulsations, Spin-down, and a Glitch from the Pulsating Ultraluminous X-Ray Source M82 X-2 [J].

Bachetti, Matteo ;

Maccarone, Thomas J. ;

Brightman, Murray ;

Brumback, McKinley C. ;

Furst, Felix ;

Harrison, Fiona A. ;

Heida, Marianne ;

Israel, Gian Luca ;

Middleton, Matthew J. ;

Tomsick, John A. ;

Webb, Natalie A. ;

Walton, Dominic J. .

ASTROPHYSICAL JOURNAL, 2020, 891 (01)

[4] LIMITING LUMINOSITY OF ACCRETING NEUTRON STARS WITH MAGNETIC-FIELDS [J].

BASKO, MM ;

SUNYAEV, RA .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1976, 175 (02) :395-417

[5] THE SHADOW WIND IN HIGH-MASS X-RAY BINARIES [J].

BLONDIN, JM .

ASTROPHYSICAL JOURNAL, 1994, 435 (02) :756-766

[6] Swift Monitoring of M51: A 38 day Superorbital Period for the Pulsar ULX7 and a New Transient Ultraluminous X-Ray Source [J].

Brightman, Murray ;

Earnshaw, Hannah ;

Fuerst, Felix ;

Harrison, Fiona A. ;

Heida, Marianne ;

Israel, Gianluca ;

Pike, Sean ;

Stern, Daniel ;

Walton, Dominic J. .

ASTROPHYSICAL JOURNAL, 2020, 895 (02)

[7] The Swift X-ray telescope [J].

Burrows, DN ;

Hill, JE ;

Nousek, JA ;

Kennea, JA ;

Wells, A ;

Osborne, JP ;

Abbey, AF ;

Beardmore, A ;

Mukerjee, K ;

Short, ADT ;

Chincarini, G ;

Campana, S ;

Citterio, O ;

Moretti, A ;

Pagani, C ;

Tagliaferri, G ;

Giommi, P ;

Capalbi, M ;

Tamburelli, F ;

Angelini, L ;

Cusumano, G ;

Bräuninger, HW ;

Burkert, W ;

Hartner, GD .

SPACE SCIENCE REVIEWS, 2005, 120 (3-4) :165-195

[8] A universal relation for the propeller mechanisms in magnetic rotating stars at different scales [J].

Campana, Sergio ;

Stella, Luigi ;

Mereghetti, Sandro ;

de Martino, Domitilla .

ASTRONOMY & ASTROPHYSICS, 2018, 610

[9] Discovery of pulsations from NGC300 ULX1 and its fast period evolution [J].

Carpano, S. ;

Haberl, F. ;

Maitra, C. ;

Vasilopoulos, G. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2018, 476 (01) :L45-L49

[10] Discovery of a 2.8 s Pulsar in a 2 Day Orbit High-mass X-Ray Binary Powering the Ultraluminous X-Ray Source ULX-7 in M51 [J].

Castillo, G. A. Rodriguez ;

Israel, G. L. ;

Belfiore, A. ;

Bernardini, F. ;

Esposito, P. ;

Pintore, F. ;

De Luca, A. ;

Papitto, A. ;

Stella, L. ;

Tiengo, A. ;

Zampieri, L. ;

Bachetti, M. ;

Brightman, M. ;

Casella, P. ;

D'Agostino, D. ;

DallOsso, S. ;

Earnshaw, H. P. ;

Furst, F. ;

Haberl, F. ;

Harrison, F. A. ;

Mapelli, M. ;

Marelli, M. ;

Middleton, M. ;

Pinto, C. ;

Roberts, T. P. ;

Salvaterra, R. ;

Turolla, R. ;

Walton, D. J. ;

Wolter, A. .

ASTROPHYSICAL JOURNAL, 2020, 895 (01)

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