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PG1226+023 Alternate Names: 3C273   ACS, HRC, F550M RA = 12:29:06.7   Dec = +02:03:09   z = 0.15834 DL =  735.7 Mpc     DA =  548.3 Mpc for  H0 = 72 km s-1 Mpc-1  ΩΛ = 0.7   ΩM = 0.3 < f > : 5.5 Onken+04 5.1 Park+12 4.8 Batiste+17 4.3 Grier+13 2.8 Graham+11  Other  MBH calculated using < f > =  4.3 MBH (Hβ only): MBH (all lines): 81.275 (+22.750/-27.715)   (107 Msun) 69.003 (+13.395/-15.810)   (107 Msun)

Reverberation Measurements
Line	JD Range (days)	τJAV (days)	τJAV Ref.	τcent (days)	τpeak (days)	σline (km s-1)	FWHM (km s-1)	RM Ref(s)	log LAGN,5100 (ergs s-1)	L Ref.
Hγ λ4340	48361 - 50997	263.8 (+ 9.0/-10.6)	Zu et al. 2011 ApJ, 735, 80	262.8 (+53.4/-67.3)	265.0 (+41.0/-41.0)	1688 (+/- 142)	3274 (+/- 484)	Kaspi et al. 2000 ApJ, 533, 631 Peterson et al. 2004 ApJ, 613, 682	45.90 (+/- 0.02)	Bentz et al. 2013 ApJ, 767, 149
Hβ λ4861	48361 - 50997	105.5 (+284.1/- 5.2)	Zu et al. 2011 ApJ, 735, 80	306.8 (+68.5/-90.9)	291.0 (+93.0/-81.0)	1777 (+/- 150)	2598 (+/- 299)	Kaspi et al. 2000 ApJ, 533, 631 Peterson et al. 2004 ApJ, 613, 682	45.90 (+/- 0.02)	Bentz et al. 2013 ApJ, 767, 149
Hα λ6563	48361 - 50997	380.0 (+40.7/- 6.0)	Zu et al. 2011 ApJ, 735, 80	435.5 (+49.6/-51.9)	395.0 (+180.0/-53.0)	...	...	Kaspi et al. 2000 ApJ, 533, 631 Peterson et al. 2004 ApJ, 613, 682	45.90 (+/- 0.02)	Bentz et al. 2013 ApJ, 767, 149

Note: Measurements are provided in the rest frame of the host galaxy. Line widths are measured in the variable (RMS) portion of the spectrum. Researchers are advised to examine the details and make their own determination of the reliability of any datasets included here.