Herschel/PACS far-infrared photometry of two z>4 quasars

Abstract

We present Herschel far-infrared (FIR) observations of two sub-mm bright quasars at high redshift: SDSS J1148+5251 (z=6.42) and BR 1202-0725 (z=4.69) obtained with the PACS instrument. Both objects are detected in the PACS photometric bands. The Herschel measurements provide additional data points that constrain the FIR spectral energy distributions (SEDs) of both sources, and they emphasise a broad range of dust temperatures in these objects. For lambda_rest ~< 20mu, the two SEDs are very similar to the average SEDs of quasars at low redshift. In the FIR, however, both quasars show excess emission compared to low-z QSO templates, most likely from cold dust powered by vigorous star formation in the QSO host galaxies. For SDSS J1148+5251 we detect another object at 160mu with a distance of ~10 arcseconds from the QSO. Although no physical connection between the quasar and this object can be shown with the available data, it could potentially confuse low-resolution measurements, thus resulting in an overestimate of the FIR luminosity of the z=6.42 quasar.

4 pages, 3 figures, accepted for publication in the A&A special issue on Herschel

References in corpus (9)

• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• 350 Micron Dust Emission from High Redshift Quasars
• A Kiloparsec-Scale Hyper-Starburst in a Quasar Host Less than 1 Gigayear after the Big Bang
• Thermal Emission from Warm Dust in the Most Distant Quasars
• Probing the Evolution of IR Properties of z~6 Quasars: Spitzer Observations
• Dust-free quasars in the early Universe
• A Detection of [CII] line emission in the z=4.7 QSO BR1202-0725

Cited by in corpus (22)

• Cool Gas in High Redshift Galaxies
• Very extended cold gas, star formation and outflows in the halo of a bright QSO at z>6
• Production of dust by massive stars at high redshift
• MESS (Mass-loss of Evolved StarS), a Herschel Key Program
• Dust grain growth in the interstellar medium of 5<z<6.5 quasars
• Complete infrared spectral energy distributions of mm detected quasars at z>5
• Physical constraints on the extended interstellar medium of the z=6.42 quasar J1148+5251: [CII] 158um, [NII] 205um and [OI] 146um observations
• Genesis and evolution of dust in galaxies in the early Universe II. Rapid dust evolution in quasars at z > 6
• The origin of the Far-infrared continuum of z ~ 6 quasars: a radiative transfer model for SDSS J1148+5251
• BR1202-0725: An Extreme Multiple Merger at z = 4.7
• A Population of Dust-Rich Quasars at z ~ 1.5
• HST narrow-band search for extended Ly-alpha emission around two z>6 quasars
• Co-evolution of Extreme Star Formation and Quasar: hints from {\it Herschel} and the Sloan Digital Sky Survey
• Star formation and black hole growth at z=4.8
• Extreme host galaxy growth in powerful early-epoch radio galaxies
• Extreme star formation in the host galaxies of the fastest growing super-massive black holes at z=4.8
• Discovery of an extremely-luminous dust-obscured galaxy observed with SDSS, WISE, JCMT, and SMA
• Hyperluminous starburst gives up its secrets
• WISE detections of known QSOs at redshifts greater than six
• ALMA [NII] 205 micron Imaging Spectroscopy of the Interacting Galaxy System BRI 1202-0725 at Redshift 4.7
• The dust emission of high-redshift quasars
• Radio studies of galaxy formation: Dense Gas History of the Universe