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News Release Archive:

News Release 22 of 42

October 3, 2002 12:00 AM (EDT)

News Release Number: STScI-2002-23

Odd Couple Widely Separated by Time and Space

A Hubble Heritage Release

October 3, 2002: Appearances can be deceiving. In this NASA Hubble Space Telescope image, an odd celestial duo, the spiral galaxy NGC 4319 [center] and a quasar called Markarian 205 [upper right], appear to be neighbors. In reality, the two objects don't even live in the same city. They are separated by time and space. NGC 4319 is 80 million light-years from Earth. Markarian 205 (Mrk 205) is more than 14 times farther away, residing 1 billion light-years from Earth. The apparent close alignment of Mrk 205 and NGC 4319 is simply a matter of chance.

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Q & A: Understanding the Discovery

  1. 1. What does the picture reveal about NGC 4319 and Mrk 205?


  2. The Hubble image shows the inner region of NGC 4319. In addition to the galaxy's inner spiral arms, an outer arm is faintly visible at lower left. The unusually dark and misshapen dust lanes in the galaxy's inner region are evidence of a disturbance, probably caused by an earlier interaction with another galaxy, NGC 4291, which is not in the photograph.

    At a distance of 1 billion light-years, Mrk 205 is a relatively nearby quasar. Many quasars reside much farther away. Quasars, once known only as mysterious point-like objects, are now known to be distant galaxies that have extremely bright cores. These powerhouses of light are probably fueled by massive black holes. With powerful telescopes like Hubble, it is often possible to see the quasar's surrounding halo of faint starlight, as is clearly visible around Mrk 205.

    Mrk 205 has a companion, a compact galaxy just below it. The objects appear to be interacting. The compact galaxy may be responsible for the structure in Mrk 205's halo.

 
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Credits: NASA and The Hubble Heritage Team (STScI/AURA)

Acknowledgment: R. Knacke (Penn State Erie)