Astronomy Picture of the Day
Astronomy Picture of the Day
Discover the cosmos! [1] Each day a different image or photograph of our
fascinating universe is featured, along with a brief explanation written by a
professional astronomer.
2018 January 28
[2]
The Long Gas Tail of Spiral Galaxy D100
Image Credit & Copyright: NASA [3] , ESA [4] , Hubble [5] , Subaru Telescope
[6] , W. Cramer [7] (Yale [8] ) et al. [9] , M. Yagi [10] , J. DePasquale [11]
Explanation: Why is there long red streak attached to this galaxy? The streak
is made mostly of glowing hydrogen [12] that has been systematically stripped
away as the galaxy moved through the ambient hot gas in a cluster of galaxies.
Specifically, the galaxy is spiral galaxy [13] D100, and cluster is the Coma
Cluster of galaxies [14] . The red path connects to the center of D100 because
the outer gas, gravitationally held less strongly, has already been stripped
away [15] by ram pressure [16] . The extended gas tail is about 200,000
light-years [17] long, contains about 400,000 times the mass of our Sun [18]
, and stars are forming within it. Galaxy D99, visible to D100's lower left,
appears red because it glows primarily from the light of old red stars [19]
-- young blue stars can no longer form because D99 has been stripped [20] of
its star-forming gas. The featured false-color picture is a digitally enhanced
composite of images from Earth-orbiting Hubble [21] and the ground-based
Subaru [22] telescope. Studying remarkable systems [23] like this bolsters
our understanding of how galaxies evolve in clusters.
Tomorrow's picture: distant thing
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Authors & editors: Robert Nemiroff [35] (MTU [36] ) & Jerry Bonnell [37]
(UMCP [38] )
NASA Official: Phillip Newman Specific rights apply [39] .
NASA Web Privacy Policy and Important Notices [40]
A service of: ASD [41] at NASA [42] / GSFC [43]
& Michigan Tech. U. [44]
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Site notes:
[1] archivepix.html
[2] image/1901/D100gas_HubbleSubaru_1448.jpg
[3] https://www.nasa.gov/
[4] https://www.esa.int/
[5] https://www.nasa.gov/content/the-hubble-story
[6] https://subarutelescope.org/
[7] https://astronomy.yale.edu/people/william-cra...
[8] https://astronomy.yale.edu/
[9] http://adsabs.harvard.edu/abs/2018arXiv181104...
[10] https://www.iau.org/administration/membership...
[11] http://jdepasquale.com/
[12] https://en.wikipedia.org/wiki/H-alpha
[13] http://cas.sdss.org/dr6/en/proj/basic/galaxie...
[14] ap180326.html
[15] https://youtu.be/KGpMC28W42Y
[16] https://en.wikipedia.org/wiki/Ram_pressure
[17] https://spaceplace.nasa.gov/light-year/en/
[18] https://solarsystem.nasa.gov/solar-system/sun...
[19] ap060704.html
[20] ap180825.html
[21] http://www.stsci.edu/hst/HST_overview
[22] https://subarutelescope.org/Introduction/inde...
[23] http://adsabs.harvard.edu/abs/2018arXiv181104...
[24] ap190127.html
[25] archivepix.html
[26] lib/apsubmit2015.html
[27] lib/aptree.html
[28] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
[29] calendar/allyears.html
[30] /apod.rss
[31] lib/edlinks.html
[32] lib/about_apod.html
[33] http://asterisk.apod.com/discuss_apod.php?dat...
[34] ap190129.html
[35] http://www.phy.mtu.edu/faculty/Nemiroff.html
[36] http://www.phy.mtu.edu/
[37] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
[38] http://www.astro.umd.edu/
[39] lib/about_apod.html#srapply
[40] https://www.nasa.gov/about/highlights/HP_Priv...
[41] https://astrophysics.gsfc.nasa.gov/
[42] https://www.nasa.gov/
[43] https://www.nasa.gov/centers/goddard/
[44] http://www.mtu.edu/
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