Extragalactic Science
description
Transcript of Extragalactic Science
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Eleventh Synthesis Imaging WorkshopSocorro, June 10-17, 2008
Extragalactic Science
Jim Condon
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Eleventh Synthesis Imaging Workshop, June 10-17, 2008
Why Synthesis Imaging?
Angular resolution can be specified by the observer (to reduce “confusion,” match angular scales of the source or multiwavelength data -- but trade off surface-brightness sensitivity)
Extremely accurate absolute astrometry (high angular resolution, clocks instead of rulers, no plane-parallel refraction)
High dynamic range via deconvolution and self-calibration “fixing” telescope
High sensitivity via long integrations, suppression of “baseline” errors and RFI
(Figures from Brunthaler et al. 2005, Science, 307, 1440)
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Eleventh Synthesis Imaging Workshop, June 10-17, 2008
Extragalactic Science: The radio continuum sky at 45 arcsec resolution Where’s our Galaxy?
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Eleventh Synthesis Imaging Workshop, June 10-17, 2008
“It’s turtles all the way down”
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Eleventh Synthesis Imaging Workshop, June 10-17, 2008
Flux density versus luminosity of radio sources
• Evolution 10X in luminosity few nearby sources, <z> ~ 1
• “shell” L S• AGNs at high L, S• Star-forming galaxies
at low L, S
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Eleventh Synthesis Imaging Workshop, June 10-17, 2008
High Luminosity: Relativistic Jets and Lobes from AGN
Centaurus A atradio (purple), optical, and X-ray wavelengths
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Eleventh Synthesis Imaging Workshop, June 10-17, 2008
Jet Energy via Radio Bubbles in Hot Cluster Gas
6 X 1061 ergs ~ 3 X 107 solar masses X c2 (McNamara et al. 2005, Nature, 433, 45)
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Resolution and Surface-brightness Sensitivity
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Superluminal Motion in Compact Jets
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Resolving the circumnuclear disk in NGC 4258 and directly measuring the black-hole mass
NGC 4258
r
NGC 4258
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Beating Confusion
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NVSS (45 arcsec) grayscale under GB 300-ft (12 arcmin) contours
“RMS” confusionc 0.2 -0.7 2
where is in mJy/beam, is in GHz, and is in arcmin
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Eleventh Synthesis Imaging Workshop, June 10-17, 2008
Low Luminosity: AGN+Starbursts
= 5 arcsec = 23 mJy/beam(c ~ 1 mJy/beam)
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Eleventh Synthesis Imaging Workshop, June 10-17, 2008
Low Luminosity: Star-forming Galaxies
free-free
synchrotron
dust
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Eleventh Synthesis Imaging Workshop, June 10-17, 2008
SNe and GRBs
3-o
50o
cm 1nerg 105 E
≈×≈
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VLBA/HSA Image of the Starburst Nuclei in Arp 220
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Evolution of star formation
• Radio “Madau diagram”
• Free from dust extinction
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Star Formation at High Redshift
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Primordial Starbursts
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Radio Spectral Lines: Cold Gas
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Crash Forensics
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EVLA and ALMA
• Continuous frequency coverage from 1 GHz to 50 GHz
• Detect CO at almost any redshift
• Study excitation of star-forming gas in distant galaxies
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The Most Distant Quasar
• VLA image of CO (4-3) from the first known star formation– Redshifted
to 46 GHz
• Optical Image
• Artist’s conception of disk of molecules and dust
Walter et al. 2003
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Geometric Distances, H0, and Dark Energy
PreliminaryProperties of UGC 3789 Maser Disk
R ~ 0.09 - 0.20 pc (0.40 - 0.87 mas)V ~ 750 - 450 km/sMbh ~ 1.2 x 107 Msun
a ~ 3.6 km s-1 yr-1 (mean value)
D ~ 51 Mpc (15%)H0 ~ 64 km s-1 Mpc-1
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The End...
...NOT!