IPs Sorted by X-ray Fluxes

The table below lists 68 of the 71 confirmed/ironclad IPs from the 2021 version of the IP catalog in the order of their X-ray fluxes (in the unit of 10^-12 ergs cm^-2s^-1), taken from XMM or Swift XRT catalogs. While this makes the data heterogeneous, my hope is that the extra scatter introduced by this is not significant compared to those due to spectral complexity (these catalogs generally rely on simple spectral models) and to source variability.

Only confirmed or ironclad IP without X-ray fluxes are V1674 Her (at least not during the accretion powered phase; there are X-ray detections during the 2021 nova eruption, though not in catalogs), LAMOST J024048.51+195226.9, and PBC J1841.1+0138.

X-ray rank	IP	X-ray flux	Dist. rank	G mag rank	Hard X-ray rank
1	EX Hya	168.0	1	4t	17
2	V1223 Sgr	90.0	17	3	1
3	TV Col	60.0	15	8	6
4	DO Dra	52.0	4	22t	26t
5	V2400 Oph	50.0	23	9t	9
6	AO Psc	47.0	13	4t	13
7	NY Lup	41.0	41	12	2
8	IGR J17195-4100	40.0	21	22t	10
9	V709 Cas	39.0	24	13	3
10	EI UMa	36.0	36	16t	15
11	GK Per	32.0	12	2	5
12	FO Aqr	29.0	16	6t	8
13	PQ Gem	28.0	25	9t	12
14	1RXS J213344.1+510725	27.0	42	20t	7
15t	V1062 Tau	26.0	39	35	18t
15t	V515 And	26.0	29	16t	23t
17t	V2731 Oph	24.0	53	31	4
17t	BG CMi	24.0	27	19	20t
18t	V405 Aur	23.0	22	6t	11
18t	V1025 Cen	23.0	5	50	39
21	IGR J16547-1916	19.0	31	24t	18t
22t	TX Col	18.0	28	26t	36t
22t	DW Cnc	18.0	6	24t;
24	IGR J15094-6649	17.0	34t	15	20t
25	CC Scl	16.0	7	38t
26	V2306 Cyg	15.0	40	30	32t
27t	V667 Pup	14.0	50	11	16
27t	XY Ari	14.0			14
27t	AE Aqr	14.0	3	1
30	IGR J16500-3307	13.0	34t	32	22
31t	IGR J18173-2509	11.0	65	43t	31
31t	IGR J04571+4527	11.0	44	48t	23t
31t	MU Cam	11.0	30	16t	29t
34	1RXS J211336.1+542226	10.0	20	57t	41
35	V2069 Cyg	9.3	37	26t	26t
36	IGR J19267+1325	9.1	33	60t
37	IGR J17014-4306	9.0	32	26t	38
38	AX J1832.3-0840	8.3	43	67t	23t
39	IGR J08390-4833	8.2	48	43t	29t
40	V647 Aur	8.0	54	33t	35
41	V1033 Cas	7.9	46	36t	32t
42	IGR J18308-1232	7.8	55	53t	28
43	1RXS J180431.1-273932	7.7	67	48t
44	AX J1853.3-0128	6.3	8	51t
45t	V418 Gem	5.6	62	43t	42
45t	AX J1740.1-2847	5.6	52	65
45t	PBC J0927.8-6945	5.6	38	26t	40
45t	HT Cam	5.6	11	36t
49	V3037 Oph	5.1	49	62
50	1RXS J230645.0+550816	4.8	57	38t
51	Swift J0717.8-2156	4.2	59	57t	43
52	Swift J2006.4+3645	4.0	64	56	32t
53	Swift J2138.8+5544	3.9	61	57t
54	RX J2015.6+3711	3.7	45	53t
55	WX Pyx	3.3	47	38t
56	IGR J18151-1052	3.1		70	36t
57	UU Col	2.8	58	53t
58	HZ Pup	2.4	60	38t
59	CTCV J2056-3014	2.3	9	43t
60t	Swift J183920.1-045350	2.0	56	63
60t	V1323 Her	2.0	51	51t
62	V4743 Sgr	1.8	66	47
63	CXOGBS J174954.5-294335	1.3		66
64	V598 Peg	1.1	19	64
65	V349 Aqr	0.83	63	60t
66	V1460 Her	0.2	10	20t
67	DQ Her	0.12	14	14
68	V455 And	0.08	2	33t

Last updated on 2022 March 7, to correct the X-ray flux of V1025 Cen (a factor of 10 typo), which affects its ranking by a lot, and ranking of a whole bunch of systems by 1.

Please send your comments, suggestions etc. to Koji.Mukai@nasa.gov and/or Koji.Mukai@umbc.edu

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IPs Sorted by X-ray Fluxes