diff options
Diffstat (limited to 'fg21sim/extragalactic/clusters/helper.py')
| -rw-r--r-- | fg21sim/extragalactic/clusters/helper.py | 64 |
1 files changed, 26 insertions, 38 deletions
diff --git a/fg21sim/extragalactic/clusters/helper.py b/fg21sim/extragalactic/clusters/helper.py index df7809d..7aed6dd 100644 --- a/fg21sim/extragalactic/clusters/helper.py +++ b/fg21sim/extragalactic/clusters/helper.py @@ -351,57 +351,36 @@ def time_crossing(M_main, M_sub, z=0.0): return time -def halo_rprofile(re, num_re=5, I0=1.0): +def draw_halo(radius, nr=1.5, felong=None, rotation=None): """ - Generate the radial profile of a halo. + Draw the template image of one halo, which is used to simulate + the image at requested frequencies by adjusting the brightness + values. NOTE ---- - The exponential radial profile is adopted for the radio halos: + The exponential radial profile is adopted for radio halos: I(r) = I0 * exp(-r/re) with the e-folding radius ``re ~ R_halo / 3``. - Parameters - ---------- - re : float - The e-folding radius in unit of pixels. - num_re : float, optional - The times of ``re`` to determine the maximum radius. - Default: 5, i.e., rmax = 5 * re - I0 : float - The intensity/brightness at the center (i.e., r=0) - Default: 1.0 - - Returns - ------- - rprofile : 1D `~numpy.ndarray` - The values along the radial pixels (0, 1, 2, ...) - - References: Ref.[murgia2009],Eq.(1) - """ - rmax = round(re * num_re) - r = np.arange(rmax+1) - rprofile = I0 * np.exp(-r/re) - return rprofile - - -def draw_halo(rprofile, felong, rotation=0.0): - """ - Draw the template image of one halo, which is used to simulate - the image at requested frequencies by adjusting the brightness - values. + Reference: Ref.[murgia2009],Eq.(1) Parameters ---------- - rprofile : 1D `~numpy.ndarray` - The values along the radial pixels (0, 1, 2, ...), - e.g., calculated by the above ``halo_rprofile()``. - felong : float + radius : float + The halo radius in number of pixels. + nr : float, optional + The times of ``radius`` to determine the size of the template + image. + Default: 1.5 (corresponding to 3*1.5=4.5 re) + felong : float, optional The elongated fraction of the elliptical halo, which is defined as the ratio of semi-minor axis to the semi-major axis. - rotation : float + Default: ``None`` (i.e., circular halo) + rotation : float, optional The rotation angle of the elliptical halo. Unit: [deg] + Default: ``None`` (i.e., no rotation) Returns ------- @@ -409,7 +388,16 @@ def draw_halo(rprofile, felong, rotation=0.0): 2D array of the drawn halo template image. The image is normalized to have *mean* value of 1. """ + # Make halo radial brightness profile + re = radius / 3.0 # e-folding radius + rmax = round(re * nr) + r = np.arange(rmax+1) + rprofile = np.exp(-r/re) + image = circle(rprofile=rprofile) - image = circle2ellipse(image, bfraction=felong, rotation=rotation) + if felong: + image = circle2ellipse(image, bfraction=felong, rotation=rotation) + + # Normalized to have *mean* value of 1 image /= image.mean() return image |