Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/whats_on/workshops/mm_science2001/talks/Koribalski.pdf Дата изменения: Tue Apr 23 11:34:12 2002 Дата индексирования: Wed Dec 26 11:24:05 2007 Кодировка: IBM-866 Поисковые слова: ngc 253

The

Australia Telescope C ompact Array

the first southern millimetre interferometer
Bфrbel Koribalski ATNF, CSIRO


But first: The Marsfield 100 GHz

interferometer
з

(1973-77, 2 x 30cm)

PhD project by John Archer (now CTIP)

variable baseline n Lubrun & Archer: 3mm synthesis image of the Sun Millimetre Workshop n Resolution 1.6 arcmin 29 -Nov -2001
n

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Aerial photo by Dave McConnell

ATCA mm observing

Millimetre Workshop 29 -Nov -2001

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First light

on 30-November-2000 at 11:45pm

Orion SiO 86.243 GHz
Millimetre Workshop 29 -Nov -2001 4


3mm Receiver Timeline:
n n n n n

30. Nov 2000: First Light !! using only 1 baseline and 1 polarisation 10. Dec 2000: first test observations July 2001: upgrade to 2 polarisations ! September 2001: upgrade to 3 baselines early 2003: final receivers arriving
Millimetre Workshop 29 -Nov -2001 5


AT Compact Array : cm -> mm
(various bands between 1 and 115 GHz )
q 20cm q 13cm q 6cm q 3cm
(1.3-1.7 GHz) (2.2-2.5 GHz) (4.4-6.8 GHz) (8.0н9.2 GHz)

ј 1.2cm ј 0.3cm

(16-25 GHz) (85-115 GHz)
Millimetre Workshop 29 -Nov -2001 6


3mm Prototype System

з з з

Frequency range: (1) 84.906-87.305 GHz (2) 88.506-91.305 GHz
(no tuning needed !)

з з з
з

Expected antenna sensitivity: 16 Jy/K
(currently about 25 Jy/K)

3 baselines, 2 pol.:
CA02, CA03, CA04

Receiver Temp.:
CA02: CA03: CA04:

150-200 K 150-175 K 250-300 K

New technology: InP MMICs
(ATNF н CTIP collaboration)

Pointing ~5"

Project Leader: Mal Sinclair
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Millimetre Workshop 29 -Nov -2001


SiO pointing sources

commonly used at the SEST

Millimetre Workshop 29 -Nov -2001

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VX Sgr: SiO maser @ 86.243 GHz
SEST

n
ATCA

ATCA ннNarrabri ATCA Narrabri 31 m baseline 31 m baseline SiO : :86.243 GHz SiO 86.243 GHz BW = 16 MHz BW = 16 MHz channels = 512 channels = 512

Millimetre Workshop 29 -Nov -2001

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VX Sgr: SiO maser @ 86.243 GHz
ATCA

n

128 MHz 33 channels

16 MHz 512 channels

32 MHz 128 channels

8 MHz 512 channels

Millimetre Workshop 29 -Nov -2001

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Some recent projects:
n n n n n

Planets (pointing, flux & bandpass calibration) Molecular clouds (e.g. N113, NGC 6334) Molecular gas in nearby galaxies (e.g. Cen A, NGC 253, Circinus) Molecular absorption lines against bright quasars (e.g. 1921-293) Circumstellar envelopes (e.g. IRC+10216)
Millimetre Workshop 29 -Nov -2001 11


Highlight of the night !
HCO+ absorption in the galaxy Centaurus A

(December 10th, 2000)

Cen A

ATCA - -Narrabri ATCA Narrabri HCO+ : :89.188 GHz HCO+ 89.188 GHz BW = 32 MHz BW = 32 MHz

йATCA

channels = 128 channels = 128 31 m baseline 31 m baseline

Millimetre Workshop 29 -Nov -2001

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HCO+ absorption in the nearby elliptical radio galaxy Centaurus A
ATCA ннNarrabri ATCA Narrabri 31 m baseline 31 m baseline HCO+ : :89.188 GHz HCO+ 89.188 GHz BW = 32 MHz BW = 32 MHz channels = 128 channels = 128 continuum flux continuum flux about 420 mK about 420 mK Int. time: 22hours Int. time: hours

centre frequency is 89.030 GHz, around 550 km/s

Millimetre Workshop 29 -Nov -2001

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calibrated HCO+ absorption spectrum against the core of Centaurus A
ATCA ннNarrabri ATCA Narrabri 31 m baseline 31 m baseline HCO+ : :89.188 GHz HCO+ 89.188 GHz BW = 32 MHz or 100 km/s BW = 32 MHz or 100 km/s channels = 128 channels = 128 channel width = 0.84 km/s channel width = 0.84 km/s Int. time: 22hours Int. time: hours Gain correction: YES Gain correction: YES

540 (1.5) 552 (6)
Millimetre Workshop 29 -Nov -2001

bandpass correction: (YES) bandpass correction: (YES)

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HCO+ absorption in Centaurus A
(Wiklind & Combes 1997)

SEST spectra before and after baseline subtraction

Millimetre Workshop 29 -Nov -2001

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The radio galaxy Centaurus A
n n

v = 550 km/s 6 Jy @ 90 GHz

Observing parameters: n 2 IFs: BW= 64 MHz 128 channels, each n IF1: 89.010 GHz n IF2: 90.485 GHz n => velocity range: 500 - 680 km/s n EW352: 45, 75, 120m
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HCO+

HNC

Millimetre Workshop 29 -Nov -2001

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535-558

572-618 km/s

HCO

+

HNC 550 km/s

610 km/s

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ESO Press Releases

HCO+ absorption range

Millimetre Workshop 29 -Nov -2001

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The Circinus Galaxy
n n n n n n n

IF1

IF2

10 July 2001 30m baseline HCO+(1-0) Tsys about 350 K 2IFs, 128 MHz BW, 64 channels each IF 1: 89.110 GHz IF 2: 89.020 GHz

40 min

Millimetre Workshop 29 -Nov -2001

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The Galaxy NGC 253
n n n n n n n

IF1

IF2

11 July 2001 30m baseline HCO+(1-0) Tsys about 350 K 2IFs, 128 MHz BW, 64 channels each IF 1: 89.162 GHz IF 2: 89.072 GHz

140 min.

Millimetre Workshop 29 -Nov -2001

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89 GHz image of NGC 253

n n

Millimetre Workshop 29 -Nov -2001

29 Sept. 2001 184, 398, and 582m baselines (750D array) 22


Phase Calibrator: 0104-408
after self calibration

Millimetre Workshop 29 -Nov -2001

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The radio-loud blazar 1921-293 (OV-236)
n n n n

z = 0.3525+ -5 Observing parameters: v = 105.527 km/s n 2 IFs: BW=128 MHz 64 channels, each redshifted CO(1-0) at 85.260 GHz !! n IF1: 85.200 GHz 12 Jy @ 90 GHz n IF2: 85.290 GHz (highly variable) n => velocity range: 105.150-106.000 km/s n EW352: 46, 77, 122m
Millimetre Workshop 29 -Nov -2001 24


1921-293: phase vs time (30min.)

+100

3-4

(46m)

-100

2-4 2-3
Millimetre Workshop 29 -Nov -2001

(122m) (77m)

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IF 1

IF 2

after self calibration IF 1 IF 2

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IF 1

IF 2

after self calibration IF 1 IF 2

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AGB star IRC+10216
HCN C3 N(9 -8)

BIMA images

ATCA ATCA July 2001 July 2001 30m baseline 30m baseline 2 pol 2 pol.. uncalibrated uncalibrated
Millimetre Workshop 29 -Nov -2001 28

HNC

SiS (5 -4)


N113 Cloud in the LMC
HCN

n

HCO+

The Magellanic Clouds will be prime targets, despite being well situated for nighttime viewing only in the summer.

Millimetre Workshop 29 -Nov -2001

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Thermal SiO in NGC 6334 I(N)
blank NE NW

E

center

W

SE

SW

maser

29 - 2001 Single -baseline ATCA, JulyNov -2001

Millimetre Workshop

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HCO+ in Galaxy NGC 253
75m

120m

45m

Millimetre Workshop HCO+ line too wide: had to overlap 2 spectral windows. 29 -Nov -2001

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HCO+ in Galaxy NGC 253
n n

5-hr observation on 5 Oct 2001. Continuum source at center of ~0.2 Jy. Red and blue shifted line emission of ~1 Jy is detected on either side of the nucleus.
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n

Beam size 19" x 2.9 "
Millimetre Workshop 29 -Nov -2001