All Questions
Tagged with photometry james-webb-space-telescope
9 questions
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conversion from magnitude to flux
I am using GalSim for creating mock galaxies in a magnitude range of 28-29. GalSim requires the input flux in units of photons/cm^2/s . I have used the halflight radii as per the value for this ...
- 51
4
votes
1
answer
94
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Flux unit conversion
I have a jwst nircam image of a galactic field. The science images are in units of MegaJansky per steradian (MJy/sr), and so the zeropoint is 28.08652 AB mag . When I ran sextractor on this image , I ...
- 51
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103
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Luminosity function calculation
I have M_UV(absolute UV magnitudes) and redshifts of some high z sources and I want to fit UVLF for them.
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- 79
1
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1
answer
106
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GAIN in Sextractor
I'm using SExtractor for source detection from JWST CEERS NIRCam images. I'm using the fully reduced mosaics provided in CEERS website (The mosaics are on pixel scales of 0.03"/pix and are pixel-...
- 79
1
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84
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PSF Matching Images from different filters
I have a fits images corresponding to different filters of JWST. I want to make sure they are PSF matched for accurate photometric color measurements by using SExtractor. I wanted to match them to ...
- 79
1
vote
1
answer
73
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SNR (Signal to noise ratio) from image
I have JWST images across 7 filters. I extracted sources by using SExtractor. How can I estimate the SNR of each source in each filter. Should I use flux/flux_err or use flux/background_rms. (flux and ...
- 79
1
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23
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Using EAZY as photometric redshift estimation tool
I am new to JWST data analysis and currently trying to extract redshift of high redshift sources from the catalogue I created from SExtractor. I'm using EAZY (Brammer et al. 2008) for this purpose.
I ...
- 79
3
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1
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Is it possible to detect lyman alpha blobs (LABs) with the lyman-break method?
LABs are luminous extended nebulae of hydrogen gas in the early universe (z ≥ 3) found in overdensities of LAEs (lyman-alpha emitters) and LBGs (lyman-break galaxies). I was wondering if LABs could be ...
- 61
2
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65
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What could these LMC objects in this color-color diagram be?
I have performed a color-color and colour-magnitude plot of various sources detected in an LMC image (JWST NIRCAM F200W, F150W and F115W filters). I then also queried SIMBAD to collect relevant ...
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