Quintuple quasar in leo minor
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Quintuple Quasar in Leo Minor. Dick Steinberg DVAA Meeting January 10, 2014. Imaging setup at Blue Mountain 12.5” Hyperion on Paramount ME - July 2010. (distance = c * look-back time ). Latest value of Ho = 67.8(km/s)/Mpc with 1/Ho = 13.8 Gyr. v/c vs z.

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Quintuple Quasar in Leo Minor

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Quintuple quasar in leo minor

Quintuple Quasar in Leo Minor

Dick Steinberg

DVAA Meeting

January 10, 2014


Imaging setup at blue mountain 12 5 hyperion on paramount me july 2010

Imaging setup at Blue Mountain 12.5” Hyperion on Paramount ME - July 2010


Quintuple quasar in leo minor

(distance = c * look-back time )


Latest value of ho 67 8 km s mpc with 1 ho 13 8 gyr

Latest value of Ho = 67.8(km/s)/Mpc with 1/Ho = 13.8 Gyr


V c vs z

v/c vs z

v/c z vel (km/s)

0.5000000.732051150000

0.2500000.290994 75000

0.1250000.133893 37500

0.0625000.064581 18750

0.0312500.031754 9375

0.0156250.015749 4688

0.0078130.007843 2344

0.0039060.003914 1172

0.0019530.001955 586

0.0009770.000977 293

0.0004880.000488 146

0.0002440.000244 73

0.0001220.000122 37

6.10E-05 6.10E-05 18

3.05E-053.05E-05 9


Quintuple quasar in leo minor

Reference wavelengths (at rest):

Lyman α 1216 Å

Ca II H,K lines 3969Å and 3934Å

Doppler shift: λ/ λo = 1+z


Quintuple quasar in leo minor

  • SDSS J1004+4112, a Quadruply-Imaged QSO

    • Discovered in 2003 (SDSS) by Inada et al. (including Gordon Richards)

    • Spectroscopy at Keck I measures z=1.73

    • Lensed by galaxy cluster at z=0.68

    • Note that A is about 1 magnitude brighter than C


Quintuple quasar in leo minor

90-minute Hyperion image centered on

the quadruple quasar

(50 x 50 arcmin)

The brightest star is

TW LMi, mag ~7.4


Quintuple quasar in leo minor

Hyperion image detail

C is now brighter than A!


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