L1448

3 Results

 

3.1 CepheusA

In our spectra of CepheusA East and West, a large variety of H₂ and CO transitions were detected. The CO23-22 line is merged with the H₂O line at 113$\mu$m, so only an upper limit to the individual line fluxes can be inferred. Since we have not detected the usually stronger water lines at 174.6$\mu$m and 179.5$\mu$m, we attribute the flux to the CO line as an upper limit. In CepA East we only detect the higher (J>20) CO lines with even J, because the detections are Fabry-Pérot measurements and the lines with odd J were not observed with FP. For the odd J lines no useful upper limits could be deduced from the full grating scans, which have a much lower S/N. Also, very strong forbidden lines of [OI] and [CII] were found in both positions. The complete list of all our detected lines in CepheusA is given in Table2. Due to the broad instrumental profile all the lines measured in grating mode are not resolved. CO transitions measured in CepA East in the Fabry-Pérot mode are however resolved. Line profiles of eight lines from CO(J=14-13) to CO(J=28-27) are displayed in Fig.3. The shifts of the lines relative to the molecular cloud at $v_{\mbox{\tiny LSR}}=-11.15$kms^-1 (Gómez et al. 1999) are -18kms^-1. A velocity difference of 50kms^-1 is indicated by the horizontal bar in each box. The FWHM of the resolved CO lines is 49kms^-1. The resolution is insufficient to attempt to deconvolve the lines. Measurements by Vastel et al. (2000) give an instrumental profile of the LWS instrument of about 40kms^-1. This implies lines of intrinsic width not much greater than 30kms^-1. The FP measurements of CO in CepA West did not show any lines, nor did the FP SWS observations.

Figure 3: Fabry-Pérot scans of CO lines in CepheusA East. The vertical dashed lines represent the position of the line at $v_{\mbox{\tiny LSR}}\,=\,-11.15$kms-1 (Gómez et al. 1999). The horizontal bars indicate a velocity difference of 50kms-1. The best fit to each line (Gaussian line + second order polynomial baseline) is given by the dotted line.

3.2 L1448

Many CO lines were detected at several positions in L1448. In the outflow lobes, transitions of H₂ and o-H₂O are also detected. As in CepA, the CO and H₂O lines at 113$\mu$m and also the CO and H₂O lines at 108$\mu$m are merged. Also strong [OI] (C, N1 and N2) and [CII] (S1, N1 and N2) lines are found in some positions. The complete list of all measured line fluxes is given in Table3. No velocity information is available in any of the positions in L1448 because only grating observations were performed. For line profiles of the H₂ lines see Fig.3 of Nisini et al. (2000) or Fig.5 of Nisini et al. (1999).

 

 

Table 2: Observed lines in CepheusA East and West. For lines observed with SWS we only used the grating measurements, while for the fluxes from the LWS instrument mean values from both, grating and FP measurements are given.

Element	Transition	$\lambda_0 [\mu {\rm m}]$	CepA East*	CepA West*
H2	2-1Q(1)	2.551		$1.4\pm0.6$
H2	1-0Q(9)	2.560		$2.8\pm0.7$
H2	2-1Q(5)	2.604		$1.6\pm0.4$
H2	1-0O(2)	2.627	$1.1\pm0.6$	$3.9\pm0.4$
H2	1-0O(3)	2.803		$12.2\pm0.4$
H2	1-0O(4)	3.004		$3.6\pm0.3$
H2	1-0O(5)	3.235		$7.1\pm0.3$
H2	1-0O(6)	3.501		$1.9\pm0.4$
H2	1-0O(7)	3.808		$2.4\pm0.6$
H2	0-0S(12)	3.995		$1.2\pm0.4$
H2	0-0S(11)	4.181		$5.3\pm1.3$
H2	0-0S(9)	4.695	$15.1\pm4$	$16.7\pm2.5$
H2	0-0S(8)	5.053	$5.8\pm2$	$6.2\pm1.8$
H2	0-0S(7)	5.511	$19.6\pm4$	$34.7\pm3$
H2	0-0S(6)	6.108	$5.8\pm2$	$22.4\pm9$
H2	0-0S(5)	6.910	$24.9\pm2$	$59.3\pm6$
H2	0-0S(4)	8.025	$13.8\pm1.3$	$25.7\pm0.5$
H2	0-0S(3)	9.665	$9.2\pm1$	$40.8\pm0.9$
H2	0-0S(2)	12.279	$15.3\pm4$	$31.8\pm1.7$
[NeII]	2P1/2-2P3/2	12.815		$21.8\pm0.9$
H2	0-0S(1)	17.035	$7.6\pm0.8$	$13.2\pm0.3$
[FeII]	a4F7/2-a4F9/2	17.936	$28.3\pm6$
[SI]	3P1-3P2	25.249	$8.5\pm2$	$4.9\pm0.5$
[FeII]	a6D7/2-a6D9/2	25.988	$26.8\pm2.6$
H2	0-0S(0)	28.219		$4.0\pm1.3$
[SiII]	2P3/2-2P1/2	34.815	$54.7\pm6$	$70.0\pm3$
[FeII]	a6D5/2-a6D7/2	35.349	$15.7\pm5$
[OI]	3P1-3P2	63.184	$2150\pm190$	$1360\pm50$
CO	30-29	87.190	<30
CO	28-27	93.349	$28\pm9$
CO	26-25	100.461	$26\pm6$
CO	24-23	108.763	$20\pm6$
CO	23-24	113.458
o-H2O	414-303	113.537		[1.5ex]$\}$<13
CO	22-21	118.581	$54\pm11$	<20
CO	21-20	124.193		<20
CO	20-19	130.369	$58\pm9$	$47.1\pm13$
CO	19-18	137.196	<50
CO	18-17	144.784	$161\pm13$	<50
[OI]	3P0-3P1	145.525	$55\pm7$	$121\pm7$
CO+	17-16	149.760	$55\pm13$
CO	17-16	153.267	$127\pm32$	$54.4\pm11$
[CII]	2P3/2-2P1/2	157.741	$276\pm23$	$442\pm20$
CO+	16-15	159.100	$123\pm10$
CO	16-15	162.812	$237\pm21$	$42.5\pm11$
CO+	15-14	169.670	$80\pm9$
CO	15-14	173.631	$297\pm11$	$81.7\pm18$
CO	14-13	185.999	$300\pm32$	$42.4\pm12$

$^{{\rm *}}$

Fluxes in CepA East and CepA West are in 10^-16 Wm^-2.

L1448