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M31 Radio Map Green Bank 20m RT 130325

 

My first observations with the 20m radio telescope at Green Bank.
Andy

M31 Radio Map Green Bank 20m RT 130325.png

 

Great observations of a rare 21cm blue shift frequency shift. I guess M31 is really coming towards us for a crunch in the future. What I don't get is the receiver signal/noise intensity dip at or just after the 21cm marker. Receiver front end saturation from the strong Milky Way 21cm signal?
Adrian
 

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That is exactly what I understand it is

Sent from

From: [email protected] <[email protected]> on behalf of A. C. via groups.io <kjansky1@...>
Sent: Friday, March 14, 2025 2:07:06 PM
To: [email protected] <[email protected]>
Subject: Re: [baa-rag] M31 Radio Map Green Bank 20m RT 130325
?
Great observations of a rare 21cm blue shift frequency shift. I guess M31 is really coming towards us for a crunch in the future. What I don't get is the receiver signal/noise intensity dip at or just after the 21cm marker. Receiver front end saturation from the strong Milky Way 21cm signal?
Adrian
 

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Mind you, as extra-galactic sources are travelling quite fast relative to us compared to rest of Milky Way, the Milky Way dip gives an effective marker at about zero for our solar system, ie zero relatively the sun's standard of rest.
Andy

Sent from

From: [email protected] <[email protected]> on behalf of Andrew Thornett via groups.io <andrew@...>
Sent: Friday, March 14, 2025 3:07:15 PM
To: [email protected] <[email protected]>
Subject: Re: [baa-rag] M31 Radio Map Green Bank 20m RT 130325
?
That is exactly what I understand it is

Sent from
From: [email protected] <[email protected]> on behalf of A. C. via groups.io <kjansky1@...>
Sent: Friday, March 14, 2025 2:07:06 PM
To: [email protected] <[email protected]>
Subject: Re: [baa-rag] M31 Radio Map Green Bank 20m RT 130325
?
Great observations of a rare 21cm blue shift frequency shift. I guess M31 is really coming towards us for a crunch in the future. What I don't get is the receiver signal/noise intensity dip at or just after the 21cm marker. Receiver front end saturation from the strong Milky Way 21cm signal?
Adrian

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