Metallicity and Black Hole Masses of Redshift 6 Quasars
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Transcript of Metallicity and Black Hole Masses of Redshift 6 Quasars
Metallicity and Black Hole Masses of Redshift 6
Quasars
Jaron Kurk (MPIA, D)
The evening star (Mucha, 1902) The moon (Mucha, 1902)
Fabian Walter, Dominik Riechers (MPIA, D)Laura Pentericci (Monte Porzio, I)
Xiaohui Fan (Steward, AZ)
In the Universe at z > 6.0 0.5In the Universe at z > 6
Introduction
J1148+5251 z = 6.4(Barth et al. 2003)J0836+0054 z = 5.8J1030+0524 z = 6.3J1044--0125 z = 5.8(Freudling et al. 2003)
Fig. by G. Djorgovski et al.
J1030+0524 z = 6.3J1044--0125 z = 5.8J1048+4637 z = 6.2J1148+5251 z = 6.4J1306+0356 z = 6.0(Maiolino et al. 2004)
J1030+0524 z = 6.3J1306+0356 z = 6.0(Pentericci et al. 2002)
J1148+5251 z = 6.4(Willott et al. 2003)
Introduction
Fig. by G. Djorgovski et al.
J0005--0006 z = 5.9J0836+0054 z = 5.8J1030+0524 z = 6.3J1306+0356 z = 6.0J1411+1217 z = 6.0(Kurk et al., in prep.)
Large(r) sample with higher S/N and coverage of both CIV and MgII
NIR spectroscopy
• Sample of five QSOs at z > 5.8 observable with VLT
• ISAAC MR spectroscopy in SZ, J, and K bands
• Texp ~ 3 hours per object per bandQSO z* z Reference
J0836+0054
18.74 5.82 Fan et al.
(2001)J1306+03
5619.47 5.99 Fan et al.
(2001)J1411+12
1719.64 5.95 Fan et al.
(2004)J1030+05
2420.05 6.28 Fan et al.
(2001)J0005-0006
20.54 5.85 Fan et al.
(2004)
Long spectrum (hidden title)
Kz’ SZ
Fan et al.
Mean SDSS QSO SpectrumVanden Berk et al. (2001)
PL-slope = --1.56
z = 1.253_
SDSS Iron Template (hidden title)
Vanden Berk et al. (2001)
Power-law continuum
Balmer continuum
SDSS “FeII” template
Vestergaard & Wilkes FeII template
FeII emission under MgII line
Sigut & Pradhan (2003)
Vestergaard & Wilkes (2001)
Smoothed Vestergaard templateMean SDSS QSO template
MgII line
FeII template Comparison
ISAAC MR K-band
MgII spectra
SDSS “FeII” template
Simultaneous fit of power-law continuum, Balmer pseudo-continuum and template
MgII spectra
Vestergaard template
Simultaneous fit of power-law continuum, Balmer pseudo-continuum and template
MgII spectra
MgII line fit
After subtraction of continua and template
MgII spectra
CIV spectra
SZ and J band spectra
CIV spectra
SZ and J band spectra
Lorentzian curves fitted with underlying polynomial
Long spec again (hidden title)
Long spec with fit (hidden title)
Redshifts• CIV emission 0 < v < 4000 km s-1 blueward of MgII• MgII and Ly can differ by z = 0.02• New redshift accuracy on the order of z ~ 0.002
QSO zREF zMgII zFEII zCIV
J0836+0054 5.82 5.80
75.807
J1306+0356 5.99 6.01
56.030
6.007
J1411+1217 5.95 5.89
85.936
5.815
J1030+0524 6.28 6.30
06.315
6.282
J0005-0006 5.85 5.84
25.856
5.861
Black Holes Masses
• MgIIMcLure & Jarvis (2002)
• CIVVestergaard (2002)
• EddWandel, Peterson & Malkan (1999)
Black Holes Masses
QSO zREF MBH,MgII MBH,CIV MBH,Edd
J0836+0054
5.82 1.2 6.5
J1306+0356
5.99 1.1 1.6 2.0
J1411+1217
5.95 0.3 0.2 1.5
J1030+0524
6.28 0.7 1.3 1.9
J0005-0006
5.85 0.2 0.3 0.7
Black hole masses in 109 M
FeII/MgII ratios2.2 < FeII/MgII < 4.7, consistent with solar
metallicity
Dietrich et al. (2003)
Dietrich et al. (2003) Wills, Netzer, & Wills (1985) Thompson et al. (1999) Iwamuro et al. (2002) Freudling et al. (2003)
Conclusions
• Black Hole masses from 0.2 to 1.6 109 M– not only the most massive galaxies– therefore MBH-BULGE relation can hold up to the highest redshifts
• No evolution in FeII/MgII ratios up to z = 6– star formed at z > 10– or indication for decline?
• BH masses differ much more than enrichment
• Accurate redshifts for follow-up and better HII region determination
• Not mentioned: power-law slopes, absorption by intervening gas and/or gas within the system
The morning star (Mucha, 1902) The pole star (Mucha, 1902)