Observations of infrared echoes around Cassiopeia A with WISE

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Table 1

Positions and properties of detected infrared light echoes around Cassiopeia A.

Region	RA	Dec	Distance	z	Scattering angle	PA	MSB @ 22 μm	22 μm /12 μm
identifier	J2000	J2000	[pc]	[pc]	[degrees]	[degrees]	[MJy/sr]	ratio
			(1)	(2)	(3)	(4)	(5)	(6)

A	23^h23^m6^s	58°45^m15^s	52.1	–51.9	175.1	–141.8	17.89	2.43
B	23^h22^m31^s	58°52^m1^s	52.3	–51.7	171.3	–66.3	21.87	1.64
C	23^h21^m16^s	58°38^m38^s	53.9	–50.0	158.5	–120.5	25.83	2.08
D	23^h23^m42^s	59°12^m21^s	54.6	–49.2	154.7	4.5	23.35	1.71
E	23^h22^m12^s	59°23^m16^s	58.1	–45.7	142.4	–15.7	95.01	2.68
F	23^h28^m18^s	58°35^m49^s	59.5	–44.2	138.6	108.6	3.31	1.05
G	23^h26^m3^s	59°48^m59^s	71.1	–32.3	118.1	17.9	35.19	1.88
H	23^h19^m1^s	59°48^m36^s	74.5	–28.8	113.9	–29.2	15.12	1.61
I	23^h21^m34^s	60°3^m35^s	79.5	–23.6	108.5	–10.8	15.06	1.56
J	23^h27^m23^s	60°4^m57^s	83.7	–19.3	104.7	21.0	27.45	1.87
K	23^h14^m37^s	59°40^m26^s	86.4	–16.5	102.4	–51.8	37.89	2.45
L	23^h23^m51^s	60°22^m58^s	93.9	–8.8	96.9	1.8	7.46	1.43
M	23^h33^m20^s	59°45^m4^s	93.9	–8.8	96.9	52.3	8.06	1.25
N	23^h30^m25^s	60°25^m54^s	109.3	7.1	88.1	27.7	8.66	1.28
O	23^h46^m43^s	57°45^m4^s	223.1	124.4	59.3	106.7	17.71	2.11
P	23^h37^m55^s	61°43^m49^s	242.5	144.3	56.9	30.0	11.74	1.45
Q	0^h1^m31^s	57°50^m25^s	445.9	354.0	42.5	97.0	4.12	1.54
R	23^h1^m43^s	65°10^m21^s	705.5	621.6	35.1	–19.5	3.77	1.15
S	0^h1^m44^s	62°30^m54^s	571.5	483.4	38.2	47.6	3.19	1.13
T	0^h18^m57^s	61°42^m56^s	799.4	718.4	33.5	61.2	4.95	1.13

Notes. The table lists the properties of the brightest echoing features in the regions defined in the Fig. 3. (1) Direct distance between supernova and echoing dust cloud. (2) Distance between supernova and dust cloud along the line of sight – negative values indicate a position behind the SNR with respect to Earth. (3) Scattering angle. (4) Position angle with respect to the SNR. North is 0°, east + 90°. (5) Maximum surface brightness in the 22 μm band; no local cirrus subtraction. (6) 22/12 μm flux ratio average across the region; no local cirrus subtraction.

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