Find Radial Velocity of Galaxies

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Discussion Overview

The discussion revolves around the radial velocities of galaxies, specifically inquiries about obtaining a list of these velocities and clarifications regarding their definitions and measurements in astronomy.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant requests a list of galaxies and their radial velocities, indicating difficulty in finding this information online.
  • Another participant questions the meaning of "radial velocities of galaxies," asking from which center the radial measurements are taken.
  • A third participant explains that radial velocities in astronomy are measured in the radial direction from Earth, typically reduced to the heliocentric rest frame.
  • This participant provides links to databases where radial velocities can be found and suggests constraining search terms to specific parameters, such as redshift.
  • Another participant expresses gratitude for the provided resources and mentions a specific formula for calculating velocity, v=(MG/R)^1/2, indicating a focus on a different aspect of velocity calculation.

Areas of Agreement / Disagreement

There is no consensus on the specific definition of radial velocity as participants have different interpretations and focus areas. The discussion includes multiple viewpoints and remains unresolved regarding the initial request for a list of galaxies.

Contextual Notes

Participants have not agreed on the specific parameters or definitions needed to address the initial request for a list of radial velocities, leading to potential limitations in the search for information.

Quarlep
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I searched galaxies and their radial velocities in online but I found nothing can you give me a list about them.
Thanks
 
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Quarlep said:
I searched galaxies and their radial velocities in online but I found nothing can you give me a list about them.
Thanks
What do you mean "radial velocities of galaxies". Radial from what center?
 
@phinds radial velocities in astronomy are the components of velocities of observables measured in the radial direction from the vantage point (i.e. Earth), usually reduced to the heliocentric rest frame.

Quarlep said:
I searched galaxies and their radial velocities in online but I found nothing can you give me a list about them.
Thanks
Try one of the databases:
http://simbad.u-strasbg.fr/simbad/sim-fsam
http://ned.ipac.caltech.edu/ui/?q=byparams
http://www.sdss.org/dr12/

There are too many objects for any single list. Constrain the search terms to some chosen parameters. E.g., in SIMBAD adjust 'output options' so that it displays in HTML form with velocities in the list mode. Then choose e.g. a range of redshifts (type something like 'redshift > 5') in the parameter selection box. Be mindful of the two kinds of velocities displayed: 'cz velocity' and 'radial velocity'.
 
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Thanks for site.It will help me. I was talking about velocity which calculated v=(MG/R)^1/2
 

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