Project status and specifications Douglas Bock Project Manager 1.
-
date post
21-Dec-2015 -
Category
Documents
-
view
213 -
download
0
Transcript of Project status and specifications Douglas Bock Project Manager 1.
Project status and specifications
Douglas Bock
Project Manager1
+ UChicago SZA 8 3.5-m antennas
Berkeley-Illinois-Maryland Assn. array 10 6.1-m diameter antennas
Caltech array 6 10.4-m antennas
2
BIMA mosaic of M33
• CO 1-0 115 GHz
• 759 pointing centers
3
BIMA mosaic of M33(Engargiola et
al. 2003)
• 148 GMCs detected
• overlie HI filaments (HI image: Deul & van der Hulst
1987)
4
MM Wavelength T Tauri Outburst in Orion
• 2nd most luminous stellar radio outburst
• Briefly, brightest object in nebula
• Required long baselines for detection
• Magnetized T Tauri outburst
• Contemporaneous with X-ray outburst
BIMA A configuration images(Bower, Plambeck, Bolatto et al.)
5
6
7
8
9
10
11
12
13
14
antennas
3 different antenna diameters - a heterogeneous array• sensitive to wide range of spatial frequencies; image large objects, search large
areas• FOV of 8-m equivalent antenna (BIMA+OVRO) is 1.3’ at 100 GHz and 0.6’ at
230 GHz• SZA FOV more than twice as large• OVRO drive upgrade within next year to allow rapid source switching
CARMA CARMA + SZA
# antennas 15 23
# baselines 105 253
collecting area 773 m2 850 m2
15
100 GHz 230 GHz
Array Beam 1-min 5-hr Beam 1-min 5-hr
D 6.3” 0.3 K 0.02 K 2.7” 0.4 K 0.02 K
C 2.5” 2.0 K 0.1 K 1.1” 2.2 K 0.13 K
B 1.0” 12 K 0.7 K 0.4” 17 K 1.0 K
A 0.4” 77 K 4.5 K 0.2” 67 K 4 K
Line: 1 km/sec
100 GHz 230 GHz
1-min 5-hr 1-min 5-hr
0.7 mJy 0.04 mJy 1.1 mJy 0.07 mJy
sensitivity
Continuum
Factor of 5 to 20 better than present performance16
receivers
for the 1mm and 3mm bands:
• 4 GHz bandwidth, 1 polarization
• continuum sensitivity: 2-3 mJy/beam, in 1 minute
• 230 GHz brightness sensitivity: 1 K for 1 km/sec channel, 1'' beam, in 1 hour
freq (GHz) OVRO BIMA SZA210-270 SIS SIS
85-116 SIS SIS (70-116) MMIC
29-37 HEMT HEMT
22 MMIC
17
u,v coverage for declination –30 4-hr observing track
18
A-array synthesized beam, declination –30 0.26 × 0.14" FWHM
5% contours
19
first light correlator
• uses COBRA hardware design• 15 telescopes, 105 baselines• 8 independent sections:
– may be positioned anywhere in 4 GHz IF band– choose 2, 8, 31, 62, 125, 250, or 500 MHz bandwidth– velocity resolution 0.04 to 40 km s-1/ channel at 1.3 mm
• 0.5 second integrations
separate SZA correlator: 8 antennas, 28 baselines, 8 GHz bandwidth
20
timeline
June 2004 Site construction began
Sep 2004 BIMA antennas moved
May 2005 Buildings, power station complete
Mar & June 2005 OVRO antennas moved
Dec 2005 Shared-risk science, 1.5 GHz correlator
Mid 2006 Routine science with 4 GHz correlator
End 2006 High resolution (sub-arcsecond) observations
2008 Dual polarization at 1 mm, wideband MMICs at 3 mm
2009+ New correlator, array receivers21