ay 21 slides - jan 14ccs/ay21/ay21_2020jan14_slides.pdf · kennicutt 1992, apjs 79, 255 ca h,k+...
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![Page 1: Ay 21 Slides - Jan 14ccs/Ay21/Ay21_2020jan14_slides.pdf · Kennicutt 1992, ApJS 79, 255 Ca H,K+ “4000 A break” CH ~4300 A MgI+molec. ~5170 A Na I Early-Type (E) Galaxies: integrated](https://reader033.vdocuments.site/reader033/viewer/2022042400/5f0e6b287e708231d43f26a6/html5/thumbnails/1.jpg)
Ay 21 Slides - Jan 14
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http://star-www.st-and.ac.uk/~spd3/Teaching/AS3011/AS3011_5.pdf
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http://star-www.st-and.ac.uk/~spd3/Teaching/AS3011/AS3011_5.pdf
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Problems With Traditional Galaxy Classification Appearance of galaxies is strongly dependent on whichwavelength the observations are made in.
X-ray UV Visible Near-IR Far-IRNote: large change in appearance between the UV and the near infrared images.
e.g., the nearby galaxy M81:
Galaxies look “clumpier” in the UV, and increasingly smoothas we go to the visible and longer wavelengths.
4
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GalaxyLuminosityFunctionBingelli,Sandage,andTammann1988ARAA2650
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Credit: NASA/STScI- Hubble Ultra-Deep Field
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http://www.bo.astro.it/~eps/templates/ff06.jpg
GalaxySpectralEnergyDistributionsvs.HubbleType
Light from young stars
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Kennicutt1992,ApJS79,255
CaH,K+“4000Abreak”
CH~4300A
MgI+molec.~5170A
NaI
Early-Type (E) Galaxies: integrated stellar light
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ProminentNebularEmissionLines(rest-frameoptical)
[OII]3727,3729Ratiosensitivetoelectrondensity,strongathighmetallicity
[OIII]4959,5007Ratiofixed(1:3)but[OIII]/Hβsensitivetoionizingsource;strongestlineforZ<0.6Z◉
Hα/Hβ(6564/4861)Firstcountsionizingphotons,ratioshouldbe~2.9intheabsenceofreddening/extinction
[NII](6549,6585)Ratiooftwolinesfixed(1:3)but[NII]/Hαsensitivetometallicity
[SII](6717,6731)Ratiosensitivetoelectrondensity
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Kennicutt1992,ApJS79,255
Hα+[NII](6564,6585)
[SII](6718,6732)
Balmerseriesabs
[OII]3727
Typical Spiral Galaxies (MW-like)
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[SII]6717,6731
[OII]3727
Hβ,[OIII]4959,5007
Hα+[NII]
Irregular Galaxies- Strongly Star-Forming