@article{lacki_sunscreen:_2018,
	title = {Sunscreen: {Photometric} {Signatures} of {Galaxies} {Partially} {Cloaked} in {Dyson} {Spheres}},
	volume = {1807},
	shorttitle = {Sunscreen},
	url = {http://adsabs.harvard.edu/abs/2018arXiv180700077L},
	abstract = {SETI searches have so far come up negative for Kardashev Type III 
societies that capture all starlight from a galaxy. One possible reason
is that shrouding a star in a megastructure is prohibitively expensive.
Most of a galaxy's starlight comes from bright stars, which would
require structures even larger than the classical Dyson sphere to
enclose. Using a custom spectral synthesis code, I calculate what
happens to the spectrum and colors of a galaxy when only stars below a
luminosity L\_min are cloaked. I find the photometric signatures of
galaxies with L\_min {\textless}= 1 L\_sun are minor, especially for blue,
late-type galaxies. Larger luminosity thresholds ({\textgreater}{\textasciitilde} 30 L\_sun) result
in galaxies with unnatural colors and luminosities. Late-type galaxies
in NIR and early-type galaxies at UV-NIR wavelengths become redder than
uncloaked galaxies as L\_min increases. Late-type galaxies get bluer in
UV and blue light when they are cloaked, with colors similar to quasars
but very low luminosities. By selecting on color, we may find Type III
societies in large photometric surveys. I discuss how different
metallicities, ages, and initial mass functions affect the results.},
	urldate = {2018-07-03},
	journal = {ArXiv e-prints},
	author = {Lacki, Brian C.},
	month = jun,
	year = {2018},
	keywords = {Astrophysics - Astrophysics of Galaxies},
	pages = {arXiv:1807.00077},
}

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