Mrk 273 Unveiling the Hearts of (U)LIRGs with Laser Guide Star …€¦ · Chandra data suggests...
Transcript of Mrk 273 Unveiling the Hearts of (U)LIRGs with Laser Guide Star …€¦ · Chandra data suggests...
Unveiling the Hearts of (U)LIRGs
with Laser Guide Star
Adaptive Optics
Anne Medling
UC Santa Cruz
with Claire Max (UCSC) & Vivian U (UH) Image Credit: J. Stein
Mrk 273
Unveiling the Hearts of (U)LIRGs
with Laser Guide Star
Adaptive Optics
Anne Medling
UC Santa Cruz
with Claire Max (UCSC) & Vivian U (UH) Image Credit: J. Stein
http://arxiv.org/abs/1203.6708v1
Looking for Dual AGN in (U)LIRGs:
High Spatial Res is Key!
•! Dusty move to NIR
•! Small spatial scales AO FWHM~0.05”
Hubble Heritage Image ACS I-band Keck K-band w/LGS AO
NGC 6240
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NGC 2623
Observing Program
•! 5/676/"8"*0'9":;/"!5"
–!<&=>"?%(@()"20?A)3@A-"6BC"?%0'12A?'A%$"
–! DE+FG")(10+?1(=0"402=02?"H2A4";5!:/"
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–!J3')0(2".&?9?K"A3L)AM?"
•! /B"&-.&'(1A2?"
–! /10))(2"%A%N"?$-1>0?&?"AH"')3?102?"
•! !;J"&-.&'(1A2?"
–!<&=>+0O'&1(@A-")&-0?"
–!P$-(4&'()",)('9">A)0"4(??0?"
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Mrk 273
Meurer (NUV I H)
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<3,,)0"6K<"M&1>"2(.&A"
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Mrk 273
•! log (LIR/Lsun) = 12.1
•! 150 Mpc, z ~ 0.038
•! 3 nuclear components: N, SE, SW –!SW: AGN from hard X-rays
–!SE: seen only in radio, may be affiliated with star cluster in ACS
–!N: may be a pile of RSNe (Bondi+05) or a Compton-thick AGN (Iwasawa+11)
6M(?(M("01"()N"FGDD"
R>(-.2("X+2($"
<3,,)0"6K<"M&1>"2(.&A"
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0.25” ~ 200pc U, Medling+ in prep
Observed wavelength (µm)
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Mrk 273 from
the OSIRIS IFU
Mrk 273 Line Maps H2 2.12 µm flux [Si VI] flux Br ! flux
[Fe II] flux
White contours = NIR continuum
•! SE component bright in emission lines but not continuum
•! Connected to N by a bridge? U, Medling+ in prep
Mrk 273 Line Velocity Maps
U, Medling+ in prep
H2 2.12 µm [Fe II]
-300 0 km/s 300
0.25” ~ 200pc
Mrk 273 Line Velocity Maps
•! Strong rotation in N component
U, Medling+ in prep
Black contours = NIR continuum
H2 2.12 µm [Fe II]
-300 0 km/s 300
0.25” ~ 200pc
Mrk 273 Line Velocity Maps
•! Strong rotation in N component
•! Negative vel in H2 along ‘bridge’ U, Medling+ in prep
White contours = line flux, black contours = NIR continuum
H2 2.12 µm [Fe II]
-300 0 km/s 300
What’s in the N disk?
•! Chandra data suggests Compton-thick AGN (Iwasawa+11)
•! VLBI data suggests a superposition of radio supernovae (Bondi+05)
[Fe II] flux map and red contours; continuum contours in white
•! [Fe II] ~ SNe present •! But something else at the
center produces continuum but no [Fe II] – the buried AGN?
Measuring MBH from [Fe II] Velocities
This black hole
is quiescent or
buried!
U, Medling+ in prep
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r
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See AMM+11 for MBH from stellar velocities in NGC6240
Conclusions / Future Plans
•! AO is a powerful tool for studying
the starburst and AGN activity in
late-stage (U)LIRG mergers
•! Mrk 273: two nuclei revealed
•! Stay tuned for more population-
wide studies!
Image Credit: D. Beales
Mrk 273 in B I K ACS B-band ACS I-band
OSIRIS K-band
NGC 6240
•! X-ray confirmed dual AGN (Komossa+03)
•! 2 nuclei ~ 700pc apart
Hubble Heritage Image ACS I-band Keck K-band w/LGS AO
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