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: http://www.sao.ru/precise/Laboratory/Publications/2000/0822_AA_v0/node9.html
Дата изменения: Sat Mar 11 12:22:26 2000 Дата индексирования: Sat Sep 11 20:55:17 2010 Кодировка: Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п п п п |
H I line observations were carried out in July 1998 and
in February 1999 with the Nançay
300m radio telescope (NRT). The NRT has a half-power beam width of
37 (EW)
22 (NS) at the declination
Dec. = 0
.
Since HS 0822+3542 had a known optical redshift,
we split the 1024-channel autocorrelator in two halves and used
a dual-polarization receiver to increase the S/N ratio.
Each correlator segment covered a 6.4 MHz bandwidth, corresponding to
a 1350 km s-1 velocity coverage, and was centred at the frequency
corresponding to the optical redshift.
The channel spacing was 2.6 km s-1 before smoothing and the effective
resolution after averaging pairs of adjacent channels and Hanning smoothing
was 10.6 km s-1. The system temperature of the receiver was
40 K in the horizontal and vertical linear polarizations.
The gain of the telescope was 1.1 K/Jy at the declination
Dec. = 0
.
The observations were made in the standard total
power (position switching) mode with 1-minute on-source
and 1-minute off-source integrations.
The data were reduced using the NRT standard programs DAC and SIR, written by the telescope's staff. Both H and V polarization spectra were calibrated and processed independently, and were finally averaged together. Error estimates were calculated following Schneider et al. ([1986]). With an integration time of 210 minutes, the r.m.s. noise is of 1.4 mJy after smoothing. HS 0822+3542 is detected with S/N=11. The spectrum is presented in Fig. 3.
![]() |
F(![]() ![]() |
I(![]() ![]() |
3727 [O II] | 0.331 ![]() |
0.331 ![]() |
3835 H9 | 0.077 ![]() |
0.080 ![]() |
3868 [Ne III] | 0.317 ![]() |
0.318 ![]() |
3889 H8 + He I | 0.199 ![]() |
0.203 ![]() |
4026 He I | 0.026 ![]() |
0.026 ![]() |
4101 H![]() |
0.271 ![]() |
0.274 ![]() |
4340 H![]() |
0.479 ![]() |
0.481 ![]() |
4363 [O III] | 0.123 ![]() |
0.123 ![]() |
4471 He I | 0.039 ![]() |
0.039 ![]() |
4861 H![]() |
1.000 ![]() |
1.000 ![]() |
4922 He I | 0.009 ![]() |
0.009 ![]() |
4959 [O III] | 1.192 ![]() |
1.190 ![]() |
5007 [O III] | 3.550 ![]() |
3.542 ![]() |
5876 He I | 0.098 ![]() |
0.097 ![]() |
6300 [O I] | 0.004 ![]() |
0.004 ![]() |
6312 [S III] | 0.010 ![]() |
0.010 ![]() |
6548 [N III] | 0.005 ![]() |
0.005 ![]() |
6563 H![]() |
2.743 ![]() |
2.729 ![]() |
6584 [N II] | 0.015 ![]() |
0.015 ![]() |
6678 He I | 0.033 ![]() |
0.033 ![]() |
6717 [S II] | 0.029 ![]() |
0.028 ![]() |
6731 [S II] | 0.018 ![]() |
0.018 ![]() |
C(H![]() |
0.005![]() |
|
F(H![]() |
0.47
![]() |
|
EW(H![]() |
292![]() |
|
EW(abs) Å | 0.6![]() |
Value | HS 0822+3542 | SBS 0335-052E1,2 | SBS 0335-052W3 | I Zw 18NW4 | I Zw 18SE4 |
![]() |
20,360![]() |
20,300![]() |
17,200![]() |
19,700![]() |
18,800![]() |
![]() |
15,790![]() |
15,800![]() |
14,700![]() |
15,600![]() |
15,300![]() |
![]() |
18,600![]() |
18,500![]() |
16,000![]() |
18,000![]() |
17,300![]() |
![]() |
<10
![]() |
524![]() |
10 | 90 | 10 |
O+/H+(![]() |
0.247![]() |
0.20![]() |
0.60![]() |
0.22![]() |
0.49![]() |
O++/H+(![]() |
1.967![]() |
1.70![]() |
1.08![]() |
1.16![]() |
1.04![]() |
O/H(![]() |
2.214![]() |
1.90![]() |
1.68![]() |
1.45![]() |
1.54![]() |
12+log(O/H) | 7.35![]() |
7.29![]() |
7.22![]() |
7.16![]() |
7.19![]() |
N+/H+(![]() |
0.992![]() |
0.60![]() |
1.72![]() |
0.64![]() |
1.43![]() |
ICF(N) | 8.962 | 8.66 | 2.81 | 6.59 | 3.14 |
log(N/O) | -1.40![]() |
-1.58![]() |
-1.54![]() |
-1.56![]() |
-1.53![]() |
Ne++/H+(![]() |
0.355![]() |
0.27![]() |
0.24![]() |
0.19![]() |
0.23![]() |
ICF(Ne) | 1.126 | 1.13 | 1.55 | 1.25 | 1.48 |
log(Ne/O) | -0.74![]() |
-0.80![]() |
-0.65![]() |
-0.80![]() |
-0.65![]() |
S+/H+(![]() |
0.424![]() |
0.40![]() |
1.09![]() |
0.35![]() |
0.67![]() |
S++/H+(![]() |
2.815![]() |
1.90![]() |
2.15![]() |
1.96![]() |
2.07![]() |
ICF(S) | 2.26 | 2.21 | 1.29 | 1.82 | 1.32 |
log(S/O) | -1.48![]() |
-1.59![]() |
-1.60![]() |
-1.55![]() |
-1.63![]() |
Y(mean) | 0.255![]() |
0.249![]() |
0.238![]() |
0.217![]() |
0.242![]() |
References: 1 Izotov et al. ([1997a]); 2 Izotov & Thuan ([1999]); 3 Lipovetsky et al. ([1999]); 4 Izotov & Thuan ([1998]). |
Band |
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P25 | E25 |
![]() |
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mag arcsec-2 | arcsec | mag arcsec-2 | arcsec | pc | pc | mag | mag | |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | |
B | 20.96![]() |
1.41![]() |
20.40![]() |
1.58![]() |
118 | 318 | 18.22 | 19.46 |
V | 20.86![]() |
1.42![]() |
19.92![]() |
1.61![]() |
126 | 333 | 18.10 | 18.68 |
R | 20.57![]() |
1.38![]() |
19.79![]() |
1.61![]() |
129 | 342 | 17.88 | 18.60 |
(1) Central surface brightness of the LSB component obtained from the decomposition of each SB profile, weighted by its photometric uncertainties. | ||||||||
(2) Exponential scale length of the LSB component. | ||||||||
(3) Central surface brightness of the gaussian (SF burst) component. | ||||||||
(4) Effective size (FWHM) of the gaussian (SF burst) component. | ||||||||
(5) Linear extent of the luminous component in excess of the LSB component at a surface brightness level of 25 mag arcsec-2. | ||||||||
(6) Linear extent of the LSB component at a surface brightness level of 25 mag arcsec-2. | ||||||||
(7) Total apparent magnitude of the LSB component
estimated by extrapolation of the exponential
fitting law to R* = ![]() |
||||||||
(8) Total apparent magnitude of the SF component. |
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