Are there any examples where the transverse doppler effect is applied in astronomy?











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Are there any astronomical examples where the transverse doppler effect(Horizontal doppler effect) is applied (Derives a meaningful result)?






light special-relativity doppler-effect







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    Are there any astronomical examples where the transverse doppler effect(Horizontal doppler effect) is applied (Derives a meaningful result)?






    light special-relativity doppler-effect







    share|improve this question









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      Are there any astronomical examples where the transverse doppler effect(Horizontal doppler effect) is applied (Derives a meaningful result)?






      light special-relativity doppler-effect







      share|improve this question









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      YYJ is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      Are there any astronomical examples where the transverse doppler effect(Horizontal doppler effect) is applied (Derives a meaningful result)?






      light special-relativity doppler-effect




      light special-relativity doppler-effect






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          Accounting for the transverse Doppler effect (and other relativistic effects) is essential in modelling the X-ray spectral emission lines from the accretion discs around black holes (e.g. Cadaz & Calvani 2005). In this case the transverse Doppler effect is "mixed up" with gravitational redshift and it is treated holistically in the Schwarzschild or Kerr metrics.



          The transverse Doppler effect is also essential in interpreting the signals from binary pulsars and even in single pulsars because of the rotation of the Earth and its motion around the Sun.






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          • One key is that your examples deal with orbiting bodies, so that there is some other source of information about the motion besides the Doppler effect. For a body moving in free space, there is no way to take one input number (Doppler shift) and get two outputs (radial and transverse velocity). Also, the transverse Doppler shift is of order $(v/c)^2$, whereas the radial Doppler shift is of order $v/c$, so to get the transverse effect to be big enough not to be lost in the radial effect, you want big velocities. Hence your examples, which are highly relativistic systems.
            – Ben Crowell
            2 days ago






          • 1




            @BenCrowell - All true, except there are now possibilities with precisely measured proper motions and parallaxes to have an independent measure of transverse velocity.
            – Rob Jeffries
            2 days ago










          • Can you check my understanding that about 25km/s or more is enough to measure the transverse velocity with the transverse doppler effect? (Source: lm.facebook.com/…)
            – KYHSGeekCode
            yesterday











          Your Answer





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          1 Answer
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          active

          oldest

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          1 Answer
          1






          active

          oldest

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          active

          oldest

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          active

          oldest

          votes








          up vote
          7
          down vote



          accepted










          Accounting for the transverse Doppler effect (and other relativistic effects) is essential in modelling the X-ray spectral emission lines from the accretion discs around black holes (e.g. Cadaz & Calvani 2005). In this case the transverse Doppler effect is "mixed up" with gravitational redshift and it is treated holistically in the Schwarzschild or Kerr metrics.



          The transverse Doppler effect is also essential in interpreting the signals from binary pulsars and even in single pulsars because of the rotation of the Earth and its motion around the Sun.






          share|improve this answer





















          • One key is that your examples deal with orbiting bodies, so that there is some other source of information about the motion besides the Doppler effect. For a body moving in free space, there is no way to take one input number (Doppler shift) and get two outputs (radial and transverse velocity). Also, the transverse Doppler shift is of order $(v/c)^2$, whereas the radial Doppler shift is of order $v/c$, so to get the transverse effect to be big enough not to be lost in the radial effect, you want big velocities. Hence your examples, which are highly relativistic systems.
            – Ben Crowell
            2 days ago






          • 1




            @BenCrowell - All true, except there are now possibilities with precisely measured proper motions and parallaxes to have an independent measure of transverse velocity.
            – Rob Jeffries
            2 days ago










          • Can you check my understanding that about 25km/s or more is enough to measure the transverse velocity with the transverse doppler effect? (Source: lm.facebook.com/…)
            – KYHSGeekCode
            yesterday















          up vote
          7
          down vote



          accepted










          Accounting for the transverse Doppler effect (and other relativistic effects) is essential in modelling the X-ray spectral emission lines from the accretion discs around black holes (e.g. Cadaz & Calvani 2005). In this case the transverse Doppler effect is "mixed up" with gravitational redshift and it is treated holistically in the Schwarzschild or Kerr metrics.



          The transverse Doppler effect is also essential in interpreting the signals from binary pulsars and even in single pulsars because of the rotation of the Earth and its motion around the Sun.






          share|improve this answer





















          • One key is that your examples deal with orbiting bodies, so that there is some other source of information about the motion besides the Doppler effect. For a body moving in free space, there is no way to take one input number (Doppler shift) and get two outputs (radial and transverse velocity). Also, the transverse Doppler shift is of order $(v/c)^2$, whereas the radial Doppler shift is of order $v/c$, so to get the transverse effect to be big enough not to be lost in the radial effect, you want big velocities. Hence your examples, which are highly relativistic systems.
            – Ben Crowell
            2 days ago






          • 1




            @BenCrowell - All true, except there are now possibilities with precisely measured proper motions and parallaxes to have an independent measure of transverse velocity.
            – Rob Jeffries
            2 days ago










          • Can you check my understanding that about 25km/s or more is enough to measure the transverse velocity with the transverse doppler effect? (Source: lm.facebook.com/…)
            – KYHSGeekCode
            yesterday













          up vote
          7
          down vote



          accepted







          up vote
          7
          down vote



          accepted






          Accounting for the transverse Doppler effect (and other relativistic effects) is essential in modelling the X-ray spectral emission lines from the accretion discs around black holes (e.g. Cadaz & Calvani 2005). In this case the transverse Doppler effect is "mixed up" with gravitational redshift and it is treated holistically in the Schwarzschild or Kerr metrics.



          The transverse Doppler effect is also essential in interpreting the signals from binary pulsars and even in single pulsars because of the rotation of the Earth and its motion around the Sun.






          share|improve this answer












          Accounting for the transverse Doppler effect (and other relativistic effects) is essential in modelling the X-ray spectral emission lines from the accretion discs around black holes (e.g. Cadaz & Calvani 2005). In this case the transverse Doppler effect is "mixed up" with gravitational redshift and it is treated holistically in the Schwarzschild or Kerr metrics.



          The transverse Doppler effect is also essential in interpreting the signals from binary pulsars and even in single pulsars because of the rotation of the Earth and its motion around the Sun.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 2 days ago









          Rob Jeffries

          50.2k499152




          50.2k499152












          • One key is that your examples deal with orbiting bodies, so that there is some other source of information about the motion besides the Doppler effect. For a body moving in free space, there is no way to take one input number (Doppler shift) and get two outputs (radial and transverse velocity). Also, the transverse Doppler shift is of order $(v/c)^2$, whereas the radial Doppler shift is of order $v/c$, so to get the transverse effect to be big enough not to be lost in the radial effect, you want big velocities. Hence your examples, which are highly relativistic systems.
            – Ben Crowell
            2 days ago






          • 1




            @BenCrowell - All true, except there are now possibilities with precisely measured proper motions and parallaxes to have an independent measure of transverse velocity.
            – Rob Jeffries
            2 days ago










          • Can you check my understanding that about 25km/s or more is enough to measure the transverse velocity with the transverse doppler effect? (Source: lm.facebook.com/…)
            – KYHSGeekCode
            yesterday


















          • One key is that your examples deal with orbiting bodies, so that there is some other source of information about the motion besides the Doppler effect. For a body moving in free space, there is no way to take one input number (Doppler shift) and get two outputs (radial and transverse velocity). Also, the transverse Doppler shift is of order $(v/c)^2$, whereas the radial Doppler shift is of order $v/c$, so to get the transverse effect to be big enough not to be lost in the radial effect, you want big velocities. Hence your examples, which are highly relativistic systems.
            – Ben Crowell
            2 days ago






          • 1




            @BenCrowell - All true, except there are now possibilities with precisely measured proper motions and parallaxes to have an independent measure of transverse velocity.
            – Rob Jeffries
            2 days ago










          • Can you check my understanding that about 25km/s or more is enough to measure the transverse velocity with the transverse doppler effect? (Source: lm.facebook.com/…)
            – KYHSGeekCode
            yesterday
















          One key is that your examples deal with orbiting bodies, so that there is some other source of information about the motion besides the Doppler effect. For a body moving in free space, there is no way to take one input number (Doppler shift) and get two outputs (radial and transverse velocity). Also, the transverse Doppler shift is of order $(v/c)^2$, whereas the radial Doppler shift is of order $v/c$, so to get the transverse effect to be big enough not to be lost in the radial effect, you want big velocities. Hence your examples, which are highly relativistic systems.
          – Ben Crowell
          2 days ago




          One key is that your examples deal with orbiting bodies, so that there is some other source of information about the motion besides the Doppler effect. For a body moving in free space, there is no way to take one input number (Doppler shift) and get two outputs (radial and transverse velocity). Also, the transverse Doppler shift is of order $(v/c)^2$, whereas the radial Doppler shift is of order $v/c$, so to get the transverse effect to be big enough not to be lost in the radial effect, you want big velocities. Hence your examples, which are highly relativistic systems.
          – Ben Crowell
          2 days ago




          1




          1




          @BenCrowell - All true, except there are now possibilities with precisely measured proper motions and parallaxes to have an independent measure of transverse velocity.
          – Rob Jeffries
          2 days ago




          @BenCrowell - All true, except there are now possibilities with precisely measured proper motions and parallaxes to have an independent measure of transverse velocity.
          – Rob Jeffries
          2 days ago












          Can you check my understanding that about 25km/s or more is enough to measure the transverse velocity with the transverse doppler effect? (Source: lm.facebook.com/…)
          – KYHSGeekCode
          yesterday




          Can you check my understanding that about 25km/s or more is enough to measure the transverse velocity with the transverse doppler effect? (Source: lm.facebook.com/…)
          – KYHSGeekCode
          yesterday










          YYJ is a new contributor. Be nice, and check out our Code of Conduct.










           

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