2002A&A...385.1049T

Query : 2002A&A...385.1049T

2002A&A...385.1049T - Astronomy and Astrophysics, volume 3851049-1055 (2002/4-3)

Water maser emission in IC 342.

TARCHI A., HENKEL C., PECK A.B. and MENTEN K.M.

Abstract (from CDS):

The detection of 22GHz water vapor emission from IC 342 is reported, raising the detection rate among northern galaxies with IRAS point source fluxes S100µm>50Jy to 16%. The maser, associated with a star forming region ∼10-15" west of the nucleus, consists of a single 0.5km/s wide feature and reaches an isotropic luminosity of 10–2L☉ (D=1.8Mpc). If the time variability is intrinsic, the maser size is ≲1.5x1016cm (≲0.5mas) which corresponds to a brightness temperature of >109K. The linewidth, luminosity, and rapid variability are reminiscent of the 8km/s super maser in Orion-KL. A velocity shift of 1km/s within two weeks and subsequent rapid fading is explained in terms of a chance alignment of two dense molecular clouds. Observations at 22GHz toward Maffei 2 are also reported, yielding a 5σ upper limit of 25mJy for a channel spacing of 1.05km/s.

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Journal keyword(s): galaxies: individual: IC 342, Maffei 2 - galaxies: starburst - ISM: molecules - masers - lines: ISM radio

Simbad objects: 30

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Number of rows : 30
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 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
3 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
4 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
5 [BE83] Maser 133.95+01.07 Mas 02 27 04.7 +61 52 26           ~ 4 0
6 4C 67.05 Bla 02 28 50.05148365 +67 21 03.0293322   19.5 19.50 18.1   ~ 264 1
7 UGCA 39 GiG 02 41 55.092 +59 36 14.73   16       ~ 360 1
8 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
9 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
10 Ass Cam OB 1 As* 03 31.6 +58 38           ~ 98 0
11 [BHJ77] I-3 Rad 03 46 00.8 +68 05 56           ~ 3 0
12 [BHJ77] I-4 HII 03 46 09.3 +68 09 01           ~ 3 0
13 NAME IC 342 H2O Maser Mas 03 46 46 +68 05.7           ~ 1 0
14 IC 342 AGN 03 46 48.514 +68 05 45.98   10.5       ~ 1579 1
15 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
16 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
17 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
18 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1476 3
19 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 1015 4
20 NGC 3690B GiP 11 28 31.02 +58 33 40.7   11.8       ~ 635 4
21 NGC 3690NE AGN 11 28 33.07 +58 33 54.2   11.8       ~ 635 4
22 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
23 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
24 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 955 0
25 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
26 W 31a Rad 18 10 28.3 -19 55 59           ~ 17 0
27 W 49n HII 19 10 13.2 +09 06 12           ~ 497 3
28 W 49 SFR 19 10 20 +09 07.7           ~ 601 1
29 NAME TXFS 2226-1821 Sy2 22 29 12.4915751904 -18 10 47.242352208   16.92   15.73   ~ 65 1
30 NAME Local Arm reg ~ ~           ~ 649 0

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