Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and...

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Searching for FRBs with the interferometric arrays Monika Obrocka Prof. Ben Stappers

Transcript of Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and...

Page 1: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Searching for FRBs with the

interferometric arrays

Monika Obrocka

Prof. Ben Stappers

Page 2: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

New and future arrays/problems

What are FRBs and where do they come from?

1. How to identify a host galaxy?

2. Follow-up observations at different wavelengths?

Current and future arrays offer:

Multibeaming

Can we use multibeaming to identify a source location in real time?

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Page 3: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Multibeaming

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Page 4: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Important formulas

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𝑆(𝜐) ∝ 𝜐𝛼

𝑆𝜐 = 𝛽𝑇𝑠𝑘𝑦

𝑆𝑁

𝐺 𝑛𝑝 𝜏 Δ𝜐[𝐽𝑦]

𝛼 =log

𝑆𝐿𝑆𝐻

log𝜐𝐿𝜐𝐻

The observed flux density S often follows a power law dependency

to the first order:

The spectral index is a function of frequency:

The minimum signal that a telescope can distinguish above

the random background noise:

Telescope beam shape changes with frequency: 𝜆

𝐷

Page 5: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

LOFAR beam pattern at 150MHz

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Page 6: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

LOFAR beam pattern at 119MHz

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Page 7: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Real time first order identification

of position

Introduction

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Page 8: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Overlapping beams ratio

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Page 9: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Overlapping beams

Sensitivity maps

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Page 10: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Flux density ratio map (FDR)

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Page 11: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Differential spectral index map (DSI)

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Page 12: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Matching values from the FDR map

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Page 13: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Matching values from the DSI map

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Page 14: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Putting it all together

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Page 15: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Caveats

• We know the beam shape very well;

• We assume that the bandwidth is flat (no

scintillation);

• Transient events are very short (neglect

the Earth’s movement).

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Page 16: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Paper (in preparation)

• Methodology (in detail);

• Results of the simulations for the MUST, LOFAR and MeerKAT arrays;

– Intrinsic spectral index recovery;

– Position accuracy.

Even more details in PhD dissertation

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Page 17: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Additional slides

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Page 18: Searching for FRBs with the interferometric arrays · Monika Obrocka Prof. Ben Stappers . New and future arrays/problems What are FRBs and where do they come from? 1. How to identify

Example detection (LOFAR)

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