Astronomy current events question: most-massive black hole?

Astronomy 210L, fall semester 2012
Cuesta College, San Luis Obispo, CA

Students are assigned to read online articles on current astronomy events, and take a short current events quiz during the first 10 minutes of lab. (This motivates students to show up promptly to lab, as the time cut-off for the quiz is strictly enforced!)
Remco van den Bosch, Arjen van der Wel, Markus Pössel, "Black Hole Upsets Galaxy Models," November 29, 2012
According to researchers from the Max Planck Institute for Astronomy, the central black hole in galaxy NGC 1277 may be the most massive yet discovered, as determined by measuring:
(A) spectra of surrounding stars.
(B) emitted x-ray flares.
(C) gravitational lensing.
(D) pulsar radio beams.
(E) space-time distortions.

Correct answer: (A)

Student responses
Sections 70178, 70186, 70200
(A) : 12 students
(B) : 7 students
(C) : 6 students
(D) : 6 students
(E) : 3 students

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