80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)
description
Transcript of 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)
![Page 1: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/1.jpg)
• 80x Bandwidth (8 GHz, full stokes), with 4000 channels
• Full frequency coverage (1 to 50 GHz)
• 10x continuum sensitivity (<1uJy)
• 30% FBW at 20GHz => Large volume high z line surveys (eg. z =3.2 to 5.0 in CO 1-0 in K)
EVLA + ALMA represent > 10x improvement in observational capabilities from 1GHz to 1 THz
What is EVLA? Build on existing infrastructure, replace all electronics
(correlator, Rx, IF, M/C) => multiply ten-fold the VLA’s observational capabilities
![Page 2: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/2.jpg)
EVLA Status
• Digital retrofits 100% complete
• Receivers 100% complete at ν ≥ 18GHz w. 2GHz BW
• Full receiver complement completed 2013 + 8GHz BW
• Early science started March 2010 using new correlator Today w. 2GHz BW
![Page 3: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/3.jpg)
(sub)mm: high order molecular lines. fine structure lines, dust continuum
cm telescopes: low order molecular transitions = total gas mass, dense gas tracers
EVLA (and GBT!) and galaxy formation
100 Mo yr-1 at z=5
Synchrotron + Free-free continuum = SFR
![Page 4: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/4.jpg)
1.4 GHz Source Counts: uJy sky will ‘light up’ with SF galaxies
AGN steep
flat
starbursts
spirals
1st/NVSS 3C
EVLA uJy ~ 104 galaxies per pointing in 12hr
Star forming galaxies
![Page 5: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/5.jpg)
Stacking in bins of 3000M*= 1010 Mo 3x1011 Mo
SFR independent BAB SFR increases w. stellar mass
Extinction increases with SFR
Radio stacking of 30,000 sBzK galaxies in COSMOS: Large disk galaxy formation at z ~ 2
0.9 +/- 0.2uJy => SFR ~ 20 Mo/yr 20uJy
Pannella ea.
![Page 6: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/6.jpg)
Dawn of Downsizing: SFR/M* vs. M*
5x
tH-1 (z=1.8)
z=0.3
1.4GHz SSFR
z=1.5
z=2.1
UV SSFR
SSFR constant with M*, unlike z<1
z>1.5 sBzK well above the ‘red and dead’ line (th
-1)
=> even large galaxies actively star forming
UV dust correction = f(SFR, M*)
EVLA will sBzK
individually over wide fields
![Page 7: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/7.jpg)
SDSS 0927+2001 z = 5.8CO 2-1
Wang, Wagg ea
EVLA early science: molecular gas across cosmic time
• MBH ~ 109 Mo
• H2 mass ~ few x 1010 (α/0.8) Mo
• SFR ~ 103 Mo/yr=> very early formation of SMBH + massive galaxies at tuniv < 1Gyr
I. Quasar host galaxies at z ~ 6
11kpc
Very highly excited
500 km/s
![Page 8: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/8.jpg)
4.051
z=4.055
4.056
0.7mJyCO2-1 46GHz
0.4mJy
1000 km/s
0.3mJy
• SFR ~ 103 Mo/year
• Mgas ~ 1011 (α/0.8) Mo
• Early, clustered massive galaxy formation
II. GN20 molecule-rich proto-cluster at z=4 (Daddi ea)CO 2-1 in 3 submm galaxies, all in 256 MHz band
![Page 9: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/9.jpg)
Spectroscopic imagingGN20 z=4.0
EVLA: well sampled velocity field
+250 km/s
-250 km/s
• CO 1-0 region ~ 15 kpc
• Rotating disk + possible tidal tail
• Dynamical mass = 3e11 Mo
• Gas mass = 1.3e11 Mo
• Stellar mass = 2.3e11 Mo
=> Baryon dominated
![Page 10: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/10.jpg)
• High and low excitation components
• Clumpy, rotating CO disk ~ 10kpc clumps resolved, sizes >~ 1 kpc
clumps H2 masses ~ 109 to 1010 Mo
=> ‘Dekel Disk’: Cold Mode Accretion scales up to SMGs at tuniv < 2Gyr?
EVLA: well sampled velocity fieldGN20 CO 2-1 0.4” 0.18”
![Page 11: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/11.jpg)
III. CO observations of sBzK with EVLA/Bure: Massive gas reservoirs without extreme starbursts
6 of 6 sBzK detected in CO with Bure and/or EVLA, sizes > 10kpc
Gas masses ~ 1011 Mo ~ gas mass in SMG, but SFR < 10% SMG
Gas masses ≥ stellar masses => pushed back to epoch when galaxies are gas dominated!
CO 1-0 EVLA z ~ 1.5
(Daddi, Aravena, Dannerbauer)
![Page 12: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/12.jpg)
Lower CO excitation ~ MW [low J observations are key!]
FIR/L’CO: Gas consumption timescales ~ few x108 yrs ~ MW
secular formation of large disk galaxies during epoch of galaxy assembly (Genzel, Tacconi, Daddi…)
high z Universe is rich in molecular gas!
SMG/QSO
1
1.5
![Page 13: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/13.jpg)
Higher Density Tracers: Realm of cm telescopes
HCO+ 1-0
• ncr > 105 cm-3 (vs. ncr(CO) ~ 103 cm-3) => high order transitions hard to excite
• Linear correlation with SFR => [SFR/dense gas] ~ constant (‘counting SF clouds’)
z=2.6 HCN 1-0 200uJy
Index = 1
Gao +, Wu +
![Page 14: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/14.jpg)
Dense gas history of the Universe Tracing the fuel for galaxy formation over cosmic time
Millennium Simulations Obreschkow & Rawlings
See also Bauermeister et al.
SF Law
DGHU is primary goal for studies of galaxy formation this decade!
SFR
Mgas
sBzK
BX/BM
![Page 15: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/15.jpg)
z ~ 3 Lensed LBG
Riechers ea
Next proposal deadline is February 1, 2011
![Page 16: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/16.jpg)
END
![Page 17: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/17.jpg)
EVLA/ALMA Deep fields: the ‘missing half’ of galaxy formation
• 1000 hrs, 50 arcmin2
• Volume (EVLA Ka, CO 1-0 at z=2 to 2.8) = 1.4e5 cMpc3
• 1000 galaxies z=0.2 to 6.7 in CO with M(H2) > 1010 Mo
• 100 in [CII] z ~ 6.5
• 5000 in dust continuum
Millennium Simulations Obreschkow & Rawlings
![Page 18: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/18.jpg)
EVLA: well sampled velocity field
• Regions of active star formation are totally obscured in HST ACS image
• Clumpy, rotating CO disk ~ 10kpc clumps resolved, sizes >~ 1 kpc
clumps H2 masses ~ 109 to 1010 Mo
=> ‘Dekel Disk’: Cold Mode Accretion scales up to SMGs at tuniv < 2Gyr?
GN20 CO 2-1 0.4” 0.18”
![Page 19: 80x Bandwidth (8 GHz, full stokes), with 4000 channels Full frequency coverage (1 to 50 GHz)](https://reader035.fdocuments.in/reader035/viewer/2022070414/56814e4a550346895dbbd26b/html5/thumbnails/19.jpg)
Spectroscopic imagingGN20 z=4.0
EVLA: well sampled velocity field
• CO 1-0 region ~ 15 kpc
• Rotating disk + possible tidal tail
• Dynamical mass = 3e11 Mo
• Gas mass = 1.3e11 Mo
• Stellar mass = 2.3e11 Mo
=> Baryon dominated