APEX Extragalactic Science A. Kovcs, A. Weiss, R. Kneissl, R. - - PowerPoint PPT Presentation

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APEX Extragalactic Science A. Kovcs, A. Weiss, R. Kneissl, R. - - PowerPoint PPT Presentation

Nov 10, 2023 30 likes •325 views

APEX Extragalactic Science A. Kovcs, A. Weiss, R. Kneissl, R. Guesten & K. Menten APEX Extragalactic Science: Outline Molecular Gas (CO) Surveys Sunyaev Zel'dovich (SZ) Cluster Survey Sub-mm Deep Field Survey Nearby Galaxies in Continuum

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APEX Extragalactic Science

  • A. Kovács, A. Weiss, R. Kneissl, R. Guesten & K. Menten
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APEX Extragalactic Science: Outline

Molecular Gas (CO) Surveys Sunyaev Zel'dovich (SZ) Cluster Survey Sub-mm Deep Field Survey Nearby Galaxies in Continuum

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Tkin ~ 30-50 K (Tdust ~ 30-50 K) n(H2) ~ 10 2.7-3.5 cm-3 Tkin ~40 – 60 K (Tdust ~ 50 K) n(H2) ~ 10 3.6-4.3cm-3 Tkin ~ 200 K (Tdust ~ 200 K) n(H2) ~ 10 4.2 cm-3 Strongly lensed (m=80-100) central ~200pc surrounding the QSO. AGN heating!

  • A. Weiss

CO Survey of Active Galaxy Centers

  • R. Guesten et al.
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diffuse dense center diffuse total

CO(1-0)

  • A. Weiss

Survey of Nearby Galaxies

  • A. Weiss
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CHAMP+ Array Receiver

7 beams at 650 GHz

+

7 beams at 800 GHz

SRON & MPIfR

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APEX SZ Experiment

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Carlstrom et al. 2002, ARA&A, 40, 643 Courtesy of F. Bertoldi

The Sunyaev-Zel'dovich Effect

Inverse Compton Scattering of CMB photons in hot plasma Redshift Independent Effect Constraints on Cosmological Parameters (8, M)

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APEX SZ Camera (ASZCA)

UC Berkeley 320 Pixels at 150 GHz Transition Edge Sensors (TES) 10uK/beam rms over ~100 deg2 (requires several months of integration)

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Ruediger Kneissl

APEX SZ: Early Results...

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LABOCA

  • E. Kreysa, G. Siringo
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LABOCA

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LABOCA Science Case: Deep Fields

Collecting photons -- The more pixels the better...

SCUBA MAMBO BOLOCAM LABOCA SHARC-2 (350um) ... SCUBA-2 37 117 144 295 384 8000+

(In a few years...)

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CDFS: An 850um Deep Survey

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2 6 0.5 3 1 2 z 1000

SMGs (z~1-3)

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The Chandra Deep Field South (CDFS)

Very Low HI Column Densities

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CDFS

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Scanning Strategy: A Raster of Spirals

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LABOCA CDFS at 850um...

0.5 deg

200 h scheduled 100 h complete 1.6 mJy RMS Goal: ~1 mJy RMS

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After 100 hours 0.5 deg x 0.5 deg area with uniform coverage 1.6 – 2.0 mJy/beam rms

LABOCA CDFS at 850um...

(BoA Reduction)

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LABOCA CDFS: Map Noise Distribution

Noise is extremely consistent with Gaussian with an expected tail at positive fluxes due to resolved and unresolved sources...

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LABOCA CDFS

CDFS: First Results

Coppin et al. 2006, MNRAS, 372, 1621

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SCUBA

SHARC 2

SCUBA 2 LABOCA

11'

Need Large Field-of-View

LABOCA Science Case: Large Scale Mapping

(350um)

MAMBO-2

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NGC 253

2 mJy/beam RMS 5'

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NGC 253

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NGC 253

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Cen A

  • A. Weiss
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Data Reduction for Imaging Arrays

Separation of Source and Noise Signals

Iterated sequence of statistical estimators Computing cost linear with data size (unlike SVD and matrix methods) Targeted filtering (not blind like PCA) Easily adaptable to optimize for different science cases Massively parallelizable (large data-sets)

  • A. Kovács, PhD Thesis
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Data Reduction for Imaging Arrays

Implementations

BoA CRUSH

  • F. Schuller, A. Beelen, R. Schaaf, F. Bertoldi, C. Vlahakis, M. Nord

www.submm.caltech.edu/~sharc/crush

  • A. Kovács
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APEX Extragalactic Science

  • A. Kovács, A. Weiss, R. Guesten & K. Menten