2021ApJ...909...50V

Query : 2021ApJ...909...50V

2021ApJ...909...50V - Astrophys. J., 909, 50-50 (2021/March-1)

Chandra probes the X-ray variability of M51 ULX-7: evidence of propeller transition and X-ray dips on orbital periods.

VASILOPOULOS G., KOLIOPANOS F., HABERL F., TREIBER H., BRIGHTMAN M., EARNSHAW H.P. and GURPIDE A.

Abstract (from CDS):

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.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): High mass x-ray binary stars - Neutron stars - Pulsars

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 X SMC X-2 HXB 00 54 33.43 -73 41 01.3 13.77 16.40 16.38   14.67 O9.5III-V 143 0
2 NAME NGC 300 2010da s*b 00 55 04.86 -37 41 43.7           LBV 189 0
3 SK 160 HXB 01 17 05.1457288392 -73 26 36.014808156 12.23 13.00 13.15   13.17 O9.7Ia+ 918 0
4 [KCF2005] M82 G ULX 09 55 51.040 +69 40 45.49           ~ 284 1
5 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
6 RX J133001+47137 UX? 13 30 01.01 +47 13 43.9           ~ 108 0
7 NAME NGC 5907 ULX ULX 15 15 58.60 +56 18 10.0           ~ 180 0
8 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 2172 0
9 HD 153919 HXB 17 03 56.7725629224 -37 50 38.913331452 6.06 6.78 6.51 6.08 5.90 O6Iafcp 851 0
10 NAME NGC 7793 P13 ULX 23 57 50.90 -32 37 26.6           ~ 225 0

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