Please help me with the spectrum!
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by
Gust644
Wanted to understand more about spectra present in the classifications such as this one, why it presents a continuous line of emission and what does these lines of emission of oxygen and hydrogen alpha?
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=209.83411879931052&dec=39.66946093679967
Posted
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by
Budgieye
moderator
It is a "blue pea" , an area with lots of exploded stars. Please look at these links, and feel free to ask more questions.
Spectra guide for SDSS images in Galaxy Zoo Talk https://talk.galaxyzoo.org/#/boards/BGZ0000001/discussions/DGZ0000ulp?page=3&comment_id=53fef2ee3d5a77490c0001b6
3.8 Green peas, compact starburst, Blue compact starburst , OIII objects https://talk.galaxyzoo.org/#/boards/BGZ0000001/discussions/DGZ0000wrb?page=3&comment_id=53d8b93a0d43f77bb6000f98
SDSS image
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=209.83411879931052&dec=39.66946093679967
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Gust644
in response to Budgieye's comment.
Thank you very much 😃
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Budgieye
moderator
You are welcome.😃
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Gust644
Explain me one thing, when the spectral break is below 4000 Ângstrons does the redshift Z: 0.00 or negative?
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Budgieye
moderator
The redshift becomes negative
Negative Redshift, or Blueshift
A nearby galaxy can have a negative redshift if it is coming towards us. The galaxy M90 has a negative redshift, z=-0.0008. The light we see coming from this has been blueshifted, or moved to the left in the chart. So M90 is coming towards us.
Do not confuse with small redshifts
Very small redshifts in spectra from nearby galaxies are written like this
7.45E-3 instead of 0.00745Posted
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by
Gust644
thank you again 😃
Posted