Dense gas in nearby galaxies - XVII. The distribution of ammonia in NGC 253, Maffei 2, and IC 342

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Volume 534 (October 2011)

A&A, 534 (2011) A56

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Table 1

Gaussian fit parameters, NH₃ column densities, and rotational temperatures.

	Position
	α(J2000) δ(J2000)	NH₃	S	FWHM	v_hel	N(J,K)	T_rot(1,1;2,2)
	(h m s) (° ’ ”)	(J,K)	(mJy)	(km s^-1)	(km s^-1)	10¹³cm^-2	K

	IC 342^a
A	03 46 48.47 +68 05 43.2	(1, 1)	1.9	39.0	23.6	13.3	35.8
		(2, 2)	1.3	40.5	21.5	7.1
C	03 46 49.10 +68 05 50.9	(1, 1)	5.6	44.0	50.3	16.1	31.4
		(2, 2)	3.7	40.2	46.9	7.3
D	03 46 49.60 +68 05 58.6	(1, 1)	3.1	45.1	52.2	5.1	24.7
		(2, 2)	1.4	42.2	50.4	1.6
E	03 46 47.47 +68 05 41.8	(1, 1)	2.2	37.4	13.7	16.5	25.0
		(2, 2)	0.9	39.4	13.2	5.3
Total Map Flux		(1, 1)	1.43^b				29.3
		(2, 2)	0.89^b

	Maffei 2
A	02 41 55.66 +59 36 26.0	(1, 1)	2.0	65.6	−82.6	15.5	29.0
		(2, 2)	1.3	54.3	−82.8	6.25
B^c	02 41 55.20 +59 36 20.0	(1, 1)	4.8	74.2	−84.9	17.0	47.8
		(2, 2)	3.8	88.3	−85.9	12.0
C	02 41 54.89 +59 36 10.2	(1, 1)	5.6	66.1	0.15	15.6	23.9
		(2, 2)	4.0	37.1	−1.9	4.7
D	02 41 53.94 +59 36 59.3	(1, 1)	7.3	57.2	23.5	9.5	33.0
		(2, 2)	5.4	49.6	18.1	4.56
Total Map Flux		(1, 1)	1.83^b				32.8
		(2, 2)	0.78^b

	NGC 253
A	00 47 32.05 −25 17 26.5	(3, 3)	22.2	85.0	313.7	74
B	00 47 32.33 −25 17 20.0	(3, 3)	–	–	–
C	00 47 32.81 −25 17 21.1	(3, 3)	26.5	62.2	290.7	122
D	00 47 33.25 −25 17 16.6	(3, 3)	17.8	161.6	210.9	170
E	00 47 33.66 −25 17 12.8	(3, 3)	14.7	79.1	187.4	123
F	00 47 34.06 −25 17 11.2	(3, 3)	14.8	69.6	214.9	62
Total Map Flux		(3, 3)	11.8^b

Notes.

^(a)

The nomenclature follows the one presented by Downes etal.(1992, their Fig. 1). Component B is not seen in ammonia.

^(b)

^∫Sdv (Jy K km s^-1).

^(c)

There is ~1 mJy of absorption in the NH₃ (2, 2) line toward source B of Maffei 2 in the velocity range between −20 and 100 km s^-1. Since this absorption is at the edge of our band we did not fit a Gaussian to it.

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