Cosmicflows-4 Distance–Velocity Calculator(distances less than 500 Mpc)

This tool is featured in Kourkchi et al. 2020, AJ, 159, 67 (arXiv:1912.07214).

It computes expectation distances or velocities based on smoothed velocity field from the Wiener filter model of Valade et al. 2024, Nature Astronomy, 234 (arXiv:2409.17261).

Click here for acknowledgments.



*  Indicates required field
SGL [deg]
SGB [deg]
Cone [deg]


  Coordinate system
   equatorial
   galactic
   supergalactic

  Distance/Velocity
   distance
   velocity


If you have a long list of objects
visit the Query tab or
Click here to use the CF4 API
  
  SGL= 102.0   SGB= -2.0

RA:

187.78917

  Dec:

13.33386

Glon:

282.96547

  Glat:

75.41360

SGL:

102.00000

  SGB:

-2.00000

Parameters

Required

  • Sky position, galactic, supergalactic, or equatorial (J2000 as 360° decimal) in degrees.

Optional

  • Cone (degrees) [default 10°]; plot data points within this cone angle.
  • Distance (Mpc); returns model velocity in km/s.
  • Velocity (km/s); returns model distance(s) in Mpc – potentially more than one value.

Features

  • Model distance – velocity curve (blue) is derived from interpolation of velocities on a grid of distances with grid intervals of 6.25 Mpc. The value at each point is averaged over the 8 nearest grid points weighted by the inverse square of separation.
  • Pause cursor over blue curve for distance and velocity information at chosen location.
  • Pause cursor over data points for extra information.

How to acknowledge this work

Cosmicflows-4 Distance–Velocity Calculator

*Coordinate System:
Equatorial (J2000)
Galactic
Supergalactic


*Input Parameter:
Distance [Mpc]
Velocity [km/s]
List of objects:



1st column: longitude [deg]
2nd column: latitude [deg]
3rd column: distance [Mpc] or velocity [km/s]

Maximum number of entries per query: 500
To create more complicated queries please use the API.

Upload table:

  file size limit: 500 KB

*Either copy your input table in the text box or upload it as a file.




The output table will be automatically downloaded in csv format.
Cosmicflows-4 Distance–Velocity Calculator