The Most Luminous Quasars Amy Kimball NRAO Charlottesville (NAASC)

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Presentation transcript:

The Most Luminous Quasars Amy Kimball NRAO Charlottesville (NAASC)

Why is quasar “feedback” important for galaxy formation (and what are the two feedback modes)? How to identify candidate “most extreme feedback” objects How luminous are the most luminous quasars? What I hope you will learn from this talk

Quasar structure: an artist’s conception Mr. Brak / Wikimedia Commons / CC-BY-SA-3.0 / GFDL

Radio quasar habitat: elliptical galaxies Image courtesy of NRAO/AUI and J. M. Uson Image credit: NRAO/CIT/NASA/HST/WFPC2 Radio galaxy Fornax A / NGC 1316

Image credit: K. Cordes, S. Brown (STSci) (300 km/s)

Image: NASA/CXC/M. Weiss one billion years

Credit: NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University)

Galaxy merger model for quasar evolution (Sanders et al. 1988)

The Most Luminous Broad-line QSOs It’s only with the WISE all-sky data that we can make a concerted effort to find the *truly* most luminous QSOs… now that we have mid-infrared! SFR L bol Hopkins et al. 2008, ApJS, 175, 356

Black Hole Accretion As gas falls into a black hole, it accelerates and emits high energy radiation (ultraviolet, X-ray, and gamma-rays) This radiation has an effect on the gas near the black hole (“feedback”) Slide credit: Jillian Bellovary

Today’s most luminous and massive galaxies are “red and dead” ellipticals S. Finkelstein / CANDELS collaboration Time Croton et al NASA / ESA / Hubble Heritage Team (STScI/AURA) Galaxy color Elliptical Spiral Galaxy mass w/ quasar radio heating no heating source

“Quasar-mode” feedback in galaxies Feedback radiation heats or disrupts surrounding gas/dust, which otherwise would have formed stars The gas may even get blown out of the galaxy!

“Radio-mode feedback”: inner kpc

Goal: Identify and study the most luminous obscured and unobscured quasars and their host galaxies Project 1 : Luminous obscured quasars that are likely to be in the process of radio-jet feedback (Lonsdale+ in prep) Project 2: The most luminous unobscured quasars that are likely to be in the process of quasar-mode feedback (Kimball+ in prep) Jim Condon, Carol Lonsdale, Mark Lacy, Minjin Kim (NRAO) Peter Eisenhardt, Dan Stern (JPL) Tom Jarrett, Chao-Wei Tsai (IPAC) Andrew Blain (Leicester) Colin Lonsdale (MIT/Haystack) Robyn Smith (Drexel) Dominic Benford (Goddard)

Luminous infrared sources: Wide-field Infrared Survey Explorer From 2009 – 2011, 500 million objects observed in four infrared bands: 3.4 μm, 4.6 μm, 12 μm, 22 μm

Radio “loudness” determined with the NRAO-VLA Sky Survey (NVSS) Image courtesy of NRAO/AUI NRAO/AUI NASA / ESA / Hubble Heritage Team (STScI/AURA) Radio loud M82: starburst (not a quasar) Radio-loud quasar (post-feedback) Young radio quasar? (early feedback stage) Radio quietRadio intermediate

4.6μm to 12μm color 3.4μm to 4.6μm color Obscured (dusty) quasars are red in WISE Wright et al. 2010

Luminous obscured quasars: selection summary: 600 candidates  Reliable detection at 12 μm or 22 μm (SNR > 7)  Compact at 1.4 GHz  Intermediate radio- loudness  Very red in mid-IR

Targeted observations (southern) soartelescope.org SOAR (optical) telescope on Cerro Pachon in Chile ALMA (sub-millimeter) Cycle 0 observations (49 sources) almaobservatory.org

Targeted observations: optical spectra spectra obtained for 28 sources Broad molecular emission lines confirm classification as quasar Example here: luminosity ~10 14 L ☀ Observed wavelength [Angstroms] Emitted wavelength [Angstroms]

Targeted observations: ALMA (Cycle 0) ALMA: dust in host galaxy and in quasar torus 49 targets (southern hemisphere) ~1.5 min each 27 detections

Log (submm/farIR ratio) 6 Initial results: ALMA continuum + redshifts Starburst and quasar templates/observations Redshift Limited star formation in host galaxy? (Not your typical infrared-luminous source)

VLA: higher resolution radio imaging and radio spectra ~150 targets J

What’s next? Constrain host galaxy dust/gas properties (mass, kinematics, morphology) – high-resolution ALMA follow-up: observe CO lines High-resolution mapping of the radio jets (inner part of galaxy) – Very Large Array (VLA) and Very Long Baseline Array (VLBA) imaging Observe broader range of quasars: track properties through jet growth and different feedback stages Identify the most luminous unobscured quasars!

SDSS Data Release 7 QSO catalog: Broad-line QSO spectrum Over 100,000 QSOs in Ω ~ 10,000 deg 2 Optical QSO identification: Sloan Digital Sky Survey Bill Keel: 5 filters: u, g, r, i, z

Compilation of multi-wavelength sky surveys NVSS/ FIRST

Empirical luminosity determination Luminosity [L  ] per frequency decade Rest frequency [log Hz] Shang et al. 2011

Sample of most luminous optical QSOs All SDSS QSOs: Luminous subset: Luminosity: log [L  ] # Full sample (~102,000) Luminous QSOs (143) Black hole mass: log [M  ] # (normalized) Full sample Luminous QSOs max(M BH ) = 6.3x10 10 M  max(L bol ) = 7.3x10 14 M  9.0 ± 0.5 (log M  ) 10.2 ± 0.3 (log M  ) ± ± 0.34 # (normalized) redshift max(redshift) = 4.97 Luminous QSOs Full sample BH mass from Shen et al. 2011

Optical and mid-infrared colors

Exploration of the host galaxies of the most luminous QSOs Science goal: determine relative epoch of BH/spheroid growth in massive obscured/unobscured systems ALMA Cycle 1 submm continuum (14 sources) and [CII]158 μ m line (4 sources): estimate total far-IR luminosity, SFR, bulge mass HST Cycle 21 imaging and spectroscopy (3 sources, z~2): characterize host galaxies, independent bulge mass estimate, age of stellar population, outflowing gas Jansky VLA radio imaging (21 sources): radio loudness, spectral index, CO mapping

Summary Feedback from super-massive black holes is a critical stage in major- merger theory of galaxy/quasar evolution We identified sample of rare, extremely luminous obscured quasars in early stages of jet formation and radio feedback using optical/infrared/radio. We identified most luminous broad-line QSOs from optical/MIR sky surveys… L ~ several times L  ! Continuing investigations: – Are we observing just before/after peak starburst activity? – What are host galaxy properties in the complementary quasar samples?