Is MgIIλ2800 a reliable virial broadening estimator for quasars?

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Table 2

Measured parameters on the Hβ and Mgiiλ2800 profiles of composite spectra.

Sp. type

Hβ

Mgiiλ2800

FWHM ^a

A . I . ^b

κ ^c

)^a,d

c(0.9)^a,d

FWHM ^a

A . I . ^b

κ ^c

)^a,d

c(0.9)^a^,^d

Pop. A Full Sample

3180 ± 90

0.00 ± 0.04

0.33 ± 0.02

50 ± 110

50 ± 60

50 ± 40

110 ± 50

3040 ± 80

0.01 ± 0.04

0.36 ± 0.02

80 ± 100

80 ± 50

70 ± 40

60 ± 50

2900 ± 210

0.00 ± 0.10

0.33 ± 0.04

–20 ± 240

–20 ± 110

–20 ± 90

–40 ± 110

2600 ± 160

0.01 ± 0.09

0.38 ± 0.04

–60 ± 200

–70 ± 90

–70 ± 80

–80 ± 100

2510 ± 200

–0.15 ± 0.10

0.30 ± 0.04

–330 ± 230

–90 ± 110

–10 ± 80

30 ± 90

2560 ± 160

0.01 ± 0.09

0.38 ± 0.04

–140 ± 200

–140 ± 90

–150 ± 80

–160 ± 100

2530 ± 250

–0.23 ± 0.10

0.27 ± 0.04

–530 ± 250

–150 ± 130

10 ± 80

80 ± 100

2970 ± 210

0.01 ± 0.09

0.35 ± 0.04

–240 ± 220

–250 ± 120

–250 ± 90

–260 ± 130

Pop. B Full Sample

7050 ± 180

0.09 ± 0.04

0.38 ± 0.02

660 ± 230

220 ± 100

140 ± 80

240 ± 110

5300 ± 120

0.07 ± 0.03

0.42 ± 0.02

230 ± 140

10 ± 70

–40 ± 70

–60 ± 90

B1⁺

9420 ± 220

0.08 ± 0.03

0.40 ± 0.02

790 ± 220

380 ± 120

250 ± 110

430 ± 150

7480 ± 170

0.06 ± 0.03

0.41 ± 0.02

380 ± 180

140 ± 100

70 ± 90

50 ± 120

B1⁺⁺

13080 ± 720

0.04 ± 0.06

0.43 ± 0.04

600 ± 570

400 ± 360

290 ± 350

480 ± 480

9360 ± 490

0.02 ± 0.06

0.45 ± 0.04

100 ± 360

30 ± 240

0 ± 250

–10 ± 350

5470 ± 340

0.15 ± 0.14

0.35 ± 0.06

680 ± 650

60 ± 180

–30 ± 160

–100 ± 200

3950 ± 230

0.10 ± 0.11

0.39 ± 0.05

120 ± 360

–130 ± 130

–180 ± 120

–200 ± 150

Radio Loud

B1 CD

7060 ± 460

0.16 ± 0.04

0.36 ± 0.02

1230 ± 230

440 ± 230

310 ± 80

500 ± 240

5690 ± 330

0.10 ± 0.03

0.39 ± 0.02

590 ± 160

270 ± 170

180 ± 70

160 ± 210

B1 FRII

6790 ± 410

0.09 ± 0.05

0.37 ± 0.02

850 ± 260

420 ± 200

330 ± 80

620 ± 250

5500 ± 300

0.05 ± 0.03

0.43 ± 0.02

230 ± 120

100 ± 160

50 ± 80

30 ± 210

Notes.

^(a)

In units of km s^-1.

^(b)

Dimensionless asymmetry index computed at peak intensity.

^(c)

Dimensionless kurtosis index defined as the ratio between the full width at and maximum.

^(d)

Centroids at , , and maximum intensity.

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