All Questions
Tagged with photometry redshift
11 questions
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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
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54
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How does SDSS estimate photometric redshift of sources?
I'm looking through the data in SDSS DR 12:
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- 2,630
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64
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Angle to the line of sight
I don't understand this angle used in galaxy clustering. There is the line of sight and this angle to the line of sight which is not clear to me. Here is a transcript of a description from 1705.05442:
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- 11
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Photometry templates -- what are the templates of?
Redshift measurements from photometric data can be determined using template-fitting (Cosmos website, SDSS photo-z).
What does it mean to fit a template to determine redshift? What is the template of?
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Kaggle dataset for Photo-Z estimation?
I would like to use the dataset for this kaggle but the competition was private, is closed and I have been unable to contact anyone directly.
The challenge is machine learning for photo-z estimation ...
- 5,657
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Interpretation and understanding of the relation for the photometric redshift in a given bin
In the context of photometric probe of surveys (like LSST), I need to understand the relation I have to use for photometric bins.
Considering $p_{ph}(z_p|z)$ the probability to measure a photometric ...
CommunityBot
- 1
4
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78
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K-correction vs resizing photometric bands
Is there a difference between a K-correction (see Wiki https://en.wikipedia.org/wiki/K_correction) and simply "resizing" the bands, e.g. the 2-10 keV x-ray band, with the redshift? I've read ...
- 30.7k
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124
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Photometric redshift - empirical methods (machine learning)
I am currently learning about estimation of photometric redshifts with machine learning methods (or empirical methods in general).
These methods use the knowledge about the photometry and the ...
CommunityBot
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Relationship between photometric colour and redshift, part two
In the graphs in my previous question here, there are negative-sloped regions as the colour-z relationship oscillates. So if I look at how the I-W2 and W3-U colours change with redshift, as I've done ...
- 2,630
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Relationship between photometric colour and redshift
In this paper, the authors describe the theoretical relationship between photometric colours, particularly in Figures 1 and 6:
Since the colour is the difference between two magnitudes, and the ...
- 163k
4
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Estimating galactic dust extinction for medium band filters
I have a set of medium-band filters and I would like to compute $A_{\lambda}/E(B-V)$ for each filter which are not reported in the literatures. The magnitudes of the objects in the photometry ...
- 8,196