Long term variability of Cygnus X-1 - V. State definitions with all sky monitors

Free Access

Table 3

Time Cyg X-1 spent in the different states (hard − H, intermediate − I, soft − S) as measured by the RXTE-ASM, Swift-BAT, MAXI, and Fermi-GBM all sky monitors.

Period^a	MJD	RXTE-ASM			MAXI			Swift-BAT		Fermi-GBM
		H	I	S	H	I	S	H & I	S	H & I	S

I	50087^b−50350	37%	19%	44%	...	...	...	...	...	...	...
II	50350−51000	99%	1.0%	0%	...	...	...	...	...	...	...
III	51000−53900	63%	20%	17%	...	...	...	...	...	...	...
IV	53900−55375	97%^d	2%^d	<1%^d	...	...	...	99%	1%	...	...
V	55375−56240^c	...	...	...	17%^e	8%^e	75%^e	40%	60%	23%^f	77%^f

Notes.Between MJD 50087 and 55200, Cyg X-1 spent a total of 75.6% of its time in the hard state, 12.8% in the intermediate state, and 11.6% in the soft state as measured with ASM. Percentages are only shown if at least most of the period is covered by the respective instrument.

^(a)

Periods defined in Sect. 3.1.

^(b)

Start of period i defined by the start of the RXTE-ASM measurements.

^(c)

The end of period v is defined by the availability of data at the time of writing.

^(d)

ASM data only until MJD 55200.

^(e)

MAXI data affected by gaps in the light curve.

^(f)

Daily average values are used for GBM.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.