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Peering through the Dust: NuSTAR Observations of Two FIRST-2MASS Red Quasars

LaMassa, Stephanie M. and Ricarte, Angelo and Glikman, Eilat and Urry, C. Megan and Stern, Daniel and Yaqoob, Tahir and Lansbury, George B. and Civano, Francesca and Boggs, Steve E. and Brandt, W. N. and Chen, Chien-Ting J. and Christensen, Finn E. and Craig, William W. and Hailey, Chuck J. and Harrison, Fiona and Hickox, Ryan C. and Koss, Michael and Ricci, Claudio and Treister, Ezequiel and Zhang, William W. (2016) Peering through the Dust: NuSTAR Observations of Two FIRST-2MASS Red Quasars. Astrophysical Journal, 820 (1). Art. No. 70. ISSN 0004-637X. doi:10.3847/0004-637X/820/1/70.

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Some reddened quasars appear to be transitional objects in the merger-induced black hole growth/galaxy evolution paradigm, where a heavily obscured nucleus starts to be unveiled by powerful quasar winds evacuating the surrounding cocoon of dust and gas. Hard X-ray observations are able to peer through this gas and dust, revealing the properties of circumnuclear obscuration. Here, we present NuSTAR and XMM-Newton/Chandra observations of FIRST-2MASS selected red quasars F2M 0830+3759 and F2M 1227+3214. We find that though F2M 0830+3759 is moderately obscured (N_(H,Z) = 2.1 ± 0.2 × 10^(22) cm^(−2)) and F2M 1227+3214 is mildly absorbed (N_(H,Z) = 3.4^(+0.8)_(−0.7) × 10^(21) cm^(−2)) along the line-of-sight, heavier global obscuration may be present in both sources, with N_(H,S) = 3.7^(+4.1)_(−2.6) × 10^(23) cm^(−2) and < 5.5 × 10^(23) cm^(−2), for F2M 0830+3759 and F2M 1227+3214, respectively. F2M 0830+3759 also has an excess of soft X-ray emission below 1 keV which is well accommodated by a model where 7% of the intrinsic AGN X-ray emission is scattered into the line-of-sight. While F2M 1227+3214 has a dust-to-gas ratio (E(B − V )/N_H) consistent with the Galactic value, the E(B−V )/NH value for F2M 0830+3759 is lower than the Galactic standard, consistent with the paradigm that the dust resides on galactic scales while the X-ray reprocessing gas originates within the dust-sublimation zone of the broad-line-region. The X-ray and 6.1μm luminosities of these red quasars are consistent with the empirical relations derived for high-luminosity, unobscured quasars, extending the parameter space of obscured AGN previously observed by NuSTAR to higher luminosities.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
LaMassa, Stephanie M.0000-0002-5907-3330
Glikman, Eilat0000-0003-0489-3750
Urry, C. Megan0000-0002-0745-9792
Stern, Daniel0000-0003-2686-9241
Lansbury, George B.0000-0002-5328-9827
Civano, Francesca0000-0002-2115-1137
Boggs, Steve E.0000-0001-9567-4224
Brandt, W. N.0000-0002-0167-2453
Chen, Chien-Ting J.0000-0002-4945-5079
Christensen, Finn E.0000-0001-5679-1946
Harrison, Fiona0000-0003-2992-8024
Hickox, Ryan C.0000-0003-1468-9526
Koss, Michael0000-0002-7998-9581
Ricci, Claudio0000-0001-5231-2645
Treister, Ezequiel0000-0001-7568-6412
Zhang, William W.0000-0002-1426-9698
Additional Information:© 2016 The American Astronomical Society. Received 2015 November 30; accepted 2016 February 9; published 2016 March 21. We thank the referee for a careful reading of this manuscript and helpful comments. This work was supported under NASA contract No. NNG08FD60C, and made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). AR is supported by the Gruber Science Fellowship. EG acknowledges the generous support of the Cottrell College Award through the Research Corporation for Science Advancement. WNB acknowledges support from Caltech NuSTAR subcontract 44A-1092750 and NASA ADP grant NNX10AC99G. RCH acknowledges support from NASA through ADAP award NNX12AE38G, the National Science Foundation through grant nos. 1211096 and 1515364, a Sloan Research Fellowship, and a Dartmouth Class of 1962 Faculty Fellowship. CR acknowledges financial support from the CONICYT-Chile grants ”EMBIGGEN” Anillo ACT1101, FONDECYT 1141218, Basal-CATA PFB-06/2007. Facilities: NuSTAR,XMM
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Gruber Science FellowshipUNSPECIFIED
Cottrell Scholar of Research CorporationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Dartmouth Class of 1962 Faculty FellowshipUNSPECIFIED
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)Anillo ACT1101
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1141218
Subject Keywords:galaxies: active; infrared: galaxies; quasars: individual (F2M 0380+3759, F2M 1227+3214) ; X-rays: individual (F2M 0830+3759, F2M 1227+3214)
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2016-61
Issue or Number:1
Record Number:CaltechAUTHORS:20160318-080750044
Persistent URL:
Official Citation:Stephanie M. LaMassa et al 2016 ApJ 820 70
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65470
Deposited By: Ruth Sustaita
Deposited On:18 Mar 2016 16:44
Last Modified:10 Nov 2021 23:46

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