2009ApJ...704.1495P

Query : 2009ApJ...704.1495P

2009ApJ...704.1495P - Astrophys. J., 704, 1495-1505 (2009/October-3)

X-rays from the power sources of the Cepheus A star-forming region.

PRAVDO S.H., TSUBOI Y., UZAWA A. and EZOE Y.

Abstract (from CDS):

We report an observation of X-ray emission from the exciting region of Cepheus A with the Chandra/ACIS instrument. What had been an unresolved X-ray source comprising the putative power sources is now resolved into at least three point-like sources, each with similar X-ray properties and differing radio and submillimeter properties. The sources are HW9, HW3c, and a new source that is undetected at other wavelengths "h10." They each have inferred X-ray luminosities ≥ 1031 erg/s with hard spectra, T ≥ 107 K, and high low-energy absorption equivalent to tens to as much as a hundred magnitudes of visual absorption. The star usually assumed to be the most massive and energetic, HW2, is not detected with an upper limit about seven times lower than the detections. The X-rays may arise via thermal bremsstrahlung in diffuse emission regions associated with a gyrosynchrotron source for the radio emission, or they could arise from powerful stellar winds. We also analyzed the Spitzer/IRAC mid-IR observation from this star formation region and present the X-ray results and mid-IR classifications of the nearby stars. HH 168 is not as underluminous in X-rays as previously reported.

Abstract Copyright: ∼

Journal keyword(s): infrared: stars - stars: formation - stars: pre-main sequence - X-rays: stars

Nomenclature: Tables 1-2: [PTU2009] hNN Nos (h1-h42), [PTU2009] sNN N=10 among (Nos s2-s30).

Simbad objects: 81

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Number of rows : 81
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 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 900 0
2 HH 2H HH 05 36 25.50 -06 47 15.6           ~ 57 0
3 HH 80 HH 18 19 06.1 -20 51 49           ~ 104 0
4 HH 81 HH 18 19 06.7 -20 51 06           ~ 93 0
5 2MASS J18191051-2046578 Y*O 18 19 10.5152674584 -20 46 57.813394620   12.61   11.74 10.54 ~ 14 0
6 NAME HH 80-81 IRS HII 18 19 11.8 -20 47 35           ~ 157 0
7 NAME GGD 27-ILL SFR 18 19 12.00 -20 47 31.1           ~ 16 1
8 2MASS J18191220-2047297 Y*O 18 19 12.21 -20 47 29.7           B1 137 0
9 2MASS J18192208-2045368 Y*O 18 19 22.0893639600 -20 45 36.908831664           ~ 8 0
10 NAME Cepheus A East SFR 22 54.3 +61 46           ~ 70 0
11 [PTU2009] s27 X 22 55 51.80 +62 02 00.8           ~ 1 0
12 2MASS J22555409+6203313 X 22 55 54.0973738992 +62 03 31.316713884           ~ 1 0
13 [PTU2009] h40 X 22 55 57.146 +62 02 28.91           ~ 1 0
14 [PTU2009] s24 X 22 55 57.33 +62 02 24.9           ~ 1 0
15 2MASS J22555991+6202336 * 22 55 59.9219041632 +62 02 33.700593156           ~ 1 0
16 [PTU2009] s22 X 22 56 00.01 +62 04 16.0           ~ 1 0
17 [PTU2009] h39 X 22 56 00.19 +62 03 35.5           ~ 1 0
18 [PTU2009] s30 X 22 56 00.67 +62 01 18.4           ~ 1 0
19 2MASS J22560182+6203165 Y*O 22 56 01.8279409104 +62 03 16.552213776           ~ 5 0
20 2MASS J22560297+6202574 Y*O 22 56 02.978 +62 02 57.50           ~ 2 0
21 2MASS J22560450+6203030 Y*O 22 56 04.4985702192 +62 03 03.114643824           ~ 5 0
22 2MASS J22560553+6203068 Y*O 22 56 05.5450084344 +62 03 06.761866752           ~ 2 0
23 2MASS J22560563+6202415 X 22 56 05.6196918552 +62 02 41.654778504           ~ 1 0
24 2MASS J22560687+6204336 Y*O 22 56 06.8848204080 +62 04 33.773536704           ~ 3 0
25 2MASS J22560733+6202287 Y*O 22 56 07.337 +62 02 28.71           ~ 2 0
26 2MASS J22560761+6203307 Y*O 22 56 07.5917371056 +62 03 30.399095268           ~ 2 0
27 [PTU2009] h30 X 22 56 07.74 +62 01 51.4           ~ 1 0
28 [PTU2009] s13 X 22 56 08.63 +62 01 11.4           ~ 1 0
29 NAME HW Object HH 22 56 08.80 +62 01 44.4           ~ 10 0
30 [PTU2009] h29 X 22 56 09.115 +62 03 34.69           ~ 1 0
31 [H89] W2 Rad 22 56 09.29 +62 01 43.0           ~ 7 0
32 [PTU2009] s29 X 22 56 10.029 +62 03 48.15           ~ 1 0
33 [H89] W1 Rad 22 56 10.55 +61 20 42.2           ~ 5 0
34 2MASS J22561127+6202111 Y*O 22 56 11.2658849400 +62 02 11.153950908           ~ 5 0
35 [PTU2009] h27 X 22 56 11.536 +62 01 40.85           ~ 1 0
36 [PTU2009] s10 X 22 56 11.922 +62 00 35.79           ~ 1 0
37 [PTU2009] h25 X 22 56 12.015 +62 02 18.72           ~ 1 0
38 [PTU2009] h26 X 22 56 12.06 +62 02 29.1           ~ 1 0
39 [KCW94] 109.854+02.104 Rad 22 56 12.3843746808 +62 00 48.339477396           ~ 5 0
40 2MASS J22561302+6202425 NIR 22 56 13.021 +62 02 42.51           ~ 1 0
41 2MASS J22561302+6201123 Y*O 22 56 13.027 +62 01 12.30           ~ 2 0
42 2MASS J22561309+6200588 Y*O 22 56 13.095 +62 00 58.82           ~ 2 0
43 [PTU2009] h21 X 22 56 13.21 +62 02 07.2           ~ 1 0
44 [PTU2009] h20 X 22 56 13.338 +62 01 49.48           ~ 1 0
45 [HM90] C1 Rad 22 56 14.01 +62 02 18.4           ~ 3 0
46 [PTU2009] h17 X 22 56 14.11 +62 01 36.8           ~ 1 0
47 [PTU2009] h18 X 22 56 14.14 +62 02 05.5           ~ 1 0
48 [HL85] GGD 37 20 * 22 56 14.8947174216 +62 01 24.218076036           ~ 5 0
49 [PTU2009] s28 X 22 56 15.74 +62 01 59.0           ~ 1 0
50 2MASS J22561627+6202185 Y*O 22 56 16.278 +62 02 18.52           ~ 2 0
51 [HW84] 1a Rad 22 56 16.4 +62 01 39           ~ 12 0
52 [HW84] 1b Rad 22 56 16.6 +62 01 42           ~ 13 0
53 [HW84] 3a Rad 22 56 17.1 +62 01 44           ~ 16 0
54 [PTU2009] h14 X 22 56 17.40 +62 01 58.6           ~ 2 0
55 2MASS J22561768+6202235 * 22 56 17.6613959016 +62 02 23.597738448           ~ 2 0
56 [HW84] 8 Rad 22 56 17.68 +62 01 47.2           ~ 12 0
57 [HW84] 3b Rad 22 56 17.7 +62 01 45           ~ 20 0
58 [BCH2007] SMA 4 smm 22 56 17.820 +62 01 45.33           ~ 4 0
59 [GMM2009] Cep A 8 Y*O 22 56 17.84 +62 02 26.3           ~ 2 0
60 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 760 2
61 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 243 0
62 [PTU2009] h11 Rad 22 56 18.0 +62 01 46           ~ 27 0
63 HH 168 HH 22 56 18.0 +62 01 47           ~ 90 0
64 [HW84] 3d(iii) Rad 22 56 18.030 +62 01 46.66           ~ 2 0
65 [PTU2009] h10 X 22 56 18.10 +62 01 43.2           ~ 2 0
66 [HW84] 3d(i) Rad 22 56 18.1273 +62 01 46.596           ~ 6 0
67 [HW84] 3d(ii) Rad 22 56 18.1454 +62 01 46.559           ~ 6 0
68 [HW84] 3d Rad 22 56 18.2 +62 01 46           ~ 30 0
69 [HW84] 3d(iv) Rad 22 56 18.224 +62 01 46.34           ~ 4 0
70 NAME Cep A HW 9 Rad 22 56 18.64 +62 01 48.0           ~ 19 0
71 NAME Cep A VLA 1 Mas 22 56 18.774 +62 01 48.55           ~ 2 0
72 [PTU2009] h8 X 22 56 19.30 +62 01 34.7           ~ 1 0
73 CXOU J225619.5+620223 Y*O 22 56 19.584 +62 02 23.43           ~ 2 0
74 2MASS J22562014+6201262 Y*O 22 56 20.145 +62 01 26.30           ~ 2 0
75 CXOU J225620.1+620141 Y*O 22 56 20.183 +62 01 41.48           ~ 2 0
76 [HW84] 7a Rad 22 56 20.2 +62 01 40           ~ 14 0
77 [HL85] GGD 37 28 * 22 56 20.2276093152 +62 02 19.927034376           ~ 4 0
78 [PTU2009] h4 X 22 56 20.47 +62 01 58.8           ~ 1 0
79 [PTU2009] h3 X 22 56 20.95 +62 02 04.0           ~ 1 0
80 [PTU2009] h2 X 22 56 22.20 +62 02 00.4           ~ 1 0
81 [PTU2009] h1 X 22 56 22.99 +62 01 40.9           ~ 1 0

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