<p>Apart from 21cm line studies, radio emissions as well as signatures of different radio sources, do radio frequencies help in the identification of a particular physical structure or presence of some certain specific elements/matter present in the galaxies?
If so, what are they?</p>

CC BY-SA 4.0
2023-05-08T15:51:17.400Z
The difference between a planet and a galaxy is immense.  This makes your question slightly oddly phrased.  Do you know about the 21 cm line of Hydrogen?
James K
CC BY-SA 4.0
2023-05-08T17:45:42.727Z
Yes, I agree.To answer your question: yes, I am aware about tthe 21cm line
Dhruv Nayak
CC BY-SA 4.0
2023-05-08T18:43:28.587Z
Jupiter has decameter radio emission from 1 to 40 MHz (300 to ~7.5m wavelength) caused by the planet's magnetic field. Searches for radio emission from exoplanets are underway; a recent (open access) [paper](https://www.aanda.org/articles/aa/full_html/2019/04/aa32848-18/aa32848-18.html#S14) conclusions suggests radio emission from exoplanets out to ~20pc may be possible if the exoplanets have mag. field strengths 1-10 million times stronger than Jupiter (as expected for close-in exoplanets). This leaves the vast majority of the galaxy unsearchable for planets in the radio. Q needs some clarity
astrosnapper
CC BY-SA 4.0
2023-05-08T19:01:08.097Z
"Yes, I agree."  - can you fix your question? I makes no sense to ask about emission from planets and galaxies in the same question.
James K
CC BY-SA 4.0
2023-05-09T03:09:14.707Z
I have made the required changes.
Dhruv Nayak
<radio-astronomy><planetary-science><sky-survey><active-galaxy>
What are radio frequencies sensitive to in galaxies?
Dhruv Nayak
# What are radio frequencies sensitive to in galaxies?

(Asked by: username_0 on 2023-05-08)

Apart from 21cm line studies, radio emissions as well as signatures of different radio sources, do radio frequencies help in the identification of a particular physical structure or presence of some certain specific elements/matter present in the galaxies?
If so, what are they?

**Tags:** radio-astronomy, planetary-science, sky-survey, active-galaxy
> **Comments:**
> **username_1**: The difference between a planet and a galaxy is immense.  This makes your question slightly oddly phrased.  Do you know about the 21 cm line of Hydrogen?  
> **username_0**: Yes, I agree.To answer your question: yes, I am aware about tthe 21cm line  
> **username_2**: Jupiter has decameter radio emission from 1 to 40 MHz (300 to ~7.5m wavelength) caused by the planet's magnetic field. Searches for radio emission from exoplanets are underway; a recent (open access) [paper](https://www.aanda.org/articles/aa/full_html/2019/04/aa32848-18/aa32848-18.html#S14) conclusions suggests radio emission from exoplanets out to ~20pc may be possible if the exoplanets have mag. field strengths 1-10 million times stronger than Jupiter (as expected for close-in exoplanets). This leaves the vast majority of the galaxy unsearchable for planets in the radio. Q needs some clarity  
> **username_1**: "Yes, I agree."  - can you fix your question? I makes no sense to ask about emission from planets and galaxies in the same question.  
> **username_0**: I have made the required changes.  

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## 0 answers

