Please explain XX μm-selected galaxies

In summary, the conversation discusses the use of different selection methods for galaxies in research, specifically XX-band and mass selection. The participants are seeking confirmation that these selection methods involve choosing galaxies based on their detection with a certain instrument or their mass.
  • #1
Ikaros
19
0
Hi all,

I'm hoping a pretty simple question. When I read about researchers working on galaxy surveys, they often state they're working on "XX-band selected galaxies". For example, D.J.B. Smith et al. performed analysis on a large number of 250μm-selected galaxies at z < 0.5.

Is this as simple as it sounds - that they selected only galaxies that were detected with their 250μm instrument?

Thanks!
 
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  • #2
Along the same lines, I've seen a few "mass selected galaxies" as well. So I'm assuming that the researcher has selected a pool of galaxies using wavelength (above example) or mass (this example) as the criteria.

Can anyone confirm?
 
  • #3
come on guys :rolleyes: …

someone must know the answer to this! :smile:​
 

1. What is the significance of selecting galaxies based on XX μm wavelengths?

XX μm wavelengths refer to the infrared portion of the electromagnetic spectrum. Selecting galaxies based on this wavelength allows us to study the formation and evolution of galaxies that are obscured by dust, providing a more complete picture of the universe.

2. How are XX μm-selected galaxies different from other types of galaxies?

XX μm-selected galaxies are typically dustier and have higher star formation rates compared to galaxies selected at other wavelengths. This is because XX μm wavelengths are more sensitive to dust-enshrouded regions, where new stars are actively forming.

3. What techniques are used to select galaxies based on XX μm wavelengths?

There are several techniques used to select galaxies based on XX μm wavelengths, including photometric redshifts, color-color diagrams, and spectral energy distribution fitting. These methods take into account the unique characteristics of XX μm-selected galaxies, such as their redshifts and infrared emission, to identify them in large surveys.

4. What can we learn from studying XX μm-selected galaxies?

Studying XX μm-selected galaxies can provide insights into the processes of galaxy formation and evolution. By looking at the dust-obscured regions of galaxies, we can learn about their star formation histories, gas content, and the role of mergers and interactions in shaping their structures.

5. How do XX μm-selected galaxies contribute to our understanding of the universe?

XX μm-selected galaxies contribute to our understanding of the universe by filling in the gaps in our knowledge about galaxy formation and evolution. They provide a more complete view of the universe, as many galaxies are heavily obscured at other wavelengths, and can help us better understand the role of dust in shaping the properties of galaxies.

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