Publications
672 results found
Ade PAR, Aghanim N, Arnaud M, et al., 2015, Planck intermediate results. XXVI. Optical identification and redshifts of Planck clusters with the RTT150 telescope, Astronomy & Astrophysics, Vol: 582, ISSN: 1432-0746
We present the results of approximately three years of observations of Planck Sunyaev-Zeldovich (SZ) sources with the Russian-Turkish 1.5 m telescope (RTT150), as a part of the optical follow-up programme undertaken by the Planck collaboration. During this time period approximately 20% of all dark and grey clear time available at the telescope was devoted to observations of Planck objects. Some observations of distant clusters were also done at the 6 m Bolshoi Telescope Alt-azimutalnyi (BTA) of the Special Astrophysical Observatory of the Russian Academy of Sciences. In total, deep, direct images of more than one hundred fields were obtained in multiple filters. We identified 47 previously unknown galaxy clusters, 41 of which are included in the Planck catalogue of SZ sources. The redshifts of 65 Planck clusters were measured spectroscopically and 14 more were measured photometrically. We discuss the details of cluster optical identifications and redshift measurements. We also present new spectroscopic redshifts for 39 Planck clusters that were not included in the Planck SZ source catalogue and are published here for the first time.
Aghanim N, Altieri B, Arnaud M, et al., 2015, Planck intermediate results XXVII. High-redshift infrared galaxy overdensity candidates and lensed sources discovered by Planck and confirmed by Herschel-SPIRE, Astronomy & Astrophysics, Vol: 582, ISSN: 1432-0746
We have used the Planck all-sky submillimetre and millimetre maps to search for rare sources distinguished by extreme brightness, a few hundred millijanskies, and their potential for being situated at high redshift. These “cold” Planck sources, selected using the High Frequency Instrument (HFI) directly from the maps and from the Planck Catalogue of Compact Sources (PCCS), all satisfy the criterion of having their rest-frame far-infrared peak redshifted to the frequency range 353–857 GHz. This colour-selection favours galaxies in the redshift range z = 2–4, which we consider as cold peaks in the cosmic infrared background. With a beam at the four highest frequencies, our sample is expected to include overdensities of galaxies in groups or clusters, lensed galaxies, and chance line-of-sight projections. We perform a dedicated Herschel-SPIRE follow-up of 234 such Planck targets, finding a significant excess of red 350 and 500μm sources, in comparison to reference SPIRE fields. About 94% of the SPIRE sources in the Planck fields are consistent with being overdensities of galaxies peaking at 350μm, with 3% peaking at 500μm, and none peaking at 250μm. About 3% are candidate lensed systems, all 12 of which have secure spectroscopic confirmations, placing them at redshifts z> 2.2. Only four targets are Galactic cirrus, yielding a success rate in our search strategy for identifying extragalactic sources within the Planck beam of better than 98%. The galaxy overdensities are detected with high significance, half of the sample showing statistical significance above 10σ. The SPIRE photometric redshifts of galaxies in overdensities suggest a peak at z ≃ 2, assuming a single common dust temperature for the sources of Td = 35 K. Under this assumption, we derive an infrared (IR) luminosity for each SPIRE source of about 4 × 1012L⊙, yielding star formation rates of typically 700 M⊙ yr-1. If the observed overdensities are actual gr
Ade PAR, Aghanim N, Arnaud M, et al., 2015, Planck intermediate results XXV. The Andromeda galaxy as seen by Planck, Astronomy & Astrophysics, Vol: 582, ISSN: 1432-0746
The Andromeda galaxy (M 31) is one of a few galaxies that has sufficient angular size on the sky to be resolved by the Planck satellite. Planck has detected M 31 in all of its frequency bands, and has mapped out the dust emission with the High Frequency Instrument, clearly resolving multiple spiralarms and sub-features. We examine the morphology of this long-wavelength dust emission as seen by Planck, including a study of its outermost spiral arms, and investigate the dust heating mechanism across M 31. We find that dust dominating the longer wavelength emission (≳0.3 mm) is heated by the diffuse stellar population (as traced by 3.6 μm emission), with the dust dominating the shorter wavelength emission heated by a mix of the old stellar population and star-forming regions (as traced by 24 μm emission). We also fit spectral energy distributions for individual 5′ pixels and quantify the dust properties across the galaxy, taking into account these different heating mechanisms, finding that there is a linear decrease in temperature with galactocentric distance for dust heated by the old stellar population, as would be expected, with temperatures ranging from around 22 K in the nucleus to 14 K outside of the 10 kpc ring. Finally, we measure the integrated spectrum of the whole galaxy, which we find to be well-fitted with a global dust temperature of (18.2 ± 1.0) K with a spectral index of 1.62 ± 0.11 (assuming a single modified blackbody), and a significant amount of free-free emission at intermediate frequencies of 20–60 GHz, which corresponds to a star formation rate of around 0.12 M⊙ yr-1. We find a 2.3σ detection of the presence of spinning dust emission, with a 30 GHz amplitude of 0.7 ± 0.3 Jy, which is in line with expectations from our Galaxy.
Laporte N, Perez-Fournon I, Calanog JA, et al., 2015, Environment of the submillimeter-bright massive starburst HFLS3 at z~6.34, Astrophysical Journal, Vol: 810, ISSN: 0004-637X
We describe the search for Lyman break galaxies (LBGs) near the submillimeter-bright starburst galaxy HFLS3 at z = 6.34 and a study on the environment of this massive galaxy during the end of reionization. We performed two independent selections of LBGs on images obtained with the Gran Telescopio Canarias (GTC) and the Hubble Space Telescope (HST) by combining nondetections in bands blueward of the Lyman break and color selection. A total of 10 objects fulfilling the LBG selection criteria at $z\gt 5.5$ were selected over the 4.54 and 55.5 arcmin2 covered by our HST and GTC images, respectively. The photometric redshift, UV luminosity, and star formation rate of these sources were estimated with models of their spectral energy distribution. These $z\sim 6$ candidates have physical properties and number densities in agreement with previous results. The UV luminosity function at z ~ 6 and a Voronoi tessellation analysis of this field show no strong evidence for an overdensity of relatively bright objects (${m}_{{\rm{F}}105{\rm{W}}}\;\lt $ 25.9) associated with HFLS3. However, the overdensity parameter deduced from this field and the surface density of objects cannot exclude definitively the LBG overdensity hypothesis. Moreover, we identified three faint objects at less than 3'' from HFLS3 with color consistent with those expected for z ~ 6 galaxies. Deeper data are needed to confirm their redshifts and to study their association with HFLS3 and the galaxy merger that may be responsible for the massive starburst.
Clements DL, Greenslade J, Riechers DA, et al., 2015, Dusty Galaxies at the Highest Redshifts, Proceedings of the International Astronomical Union, Vol: 11, Pages: 84-87, ISSN: 1743-9213
The use of red colour as the basis for selecting candidate high redshift dusty galaxies from surveys made with Herschel has proved highly successful. The highest redshift such object, HFLS3, lies at z = 6.34 and numerous other sources have been found. Spectroscopic followup confirms that most of these lie at z > 4. These sources are found in such numbers that they represent a challenge to current models of galaxy evolution. We also examine the prospects for finding dusty galaxies at still higher redshifts. These would not appear in the SPIRE surveys from Herschel but would be detected in longer wavelength, submm, surveys. Several such 'SPIRE-dropouts' have been found and are now subject to followup observations.
Ade PAR, Aghanim N, Armitage-Caplan C, et al., 2015, Planck 2013 results. XXXII. The updated Planck catalogue of Sunyaev-Zeldovich sources, Astronomy & Astrophysics, Vol: 581, ISSN: 1432-0746
We update the all-sky Planck catalogue of 1227 clusters and cluster candidates (PSZ1) published in March 2013, derived from detections of the Sunyaev–Zeldovich (SZ) effect using the first 15.5 months of Planck satellite observations. As an addendum, we deliver an updated version of the PSZ1 catalogue, reporting the further confirmation of 86 Planck-discovered clusters. In total, the PSZ1 now contains 947 confirmed clusters, of which 214 were confirmed as newly discovered clusters through follow-up observations undertaken by the Planck Collaboration. The updated PSZ1 contains redshifts for 913 systems, of which 736 (~ 80.6%) are spectroscopic, and associated mass estimates derived from the Yz mass proxy. We also provide a new SZ quality flag for the remaining 280 candidates. This flag was derived from a novel artificial neural-network classification of the SZ signal. Based on this assessment, the purity of the updated PSZ1 catalogue is estimated to be 94%. In this release, we provide the full updated catalogue and an additional readme file with further information on the Planck SZ detections.
Viero MP, Moncelsi L, Quadri RF, et al., 2015, Hermes: current cosmic infrared background estimates can be explained by known galaxies and their faint companions at z<4, Astrophysical Journal Letters, Vol: 809, ISSN: 2041-8205
We report contributions to cosmic infrared background (CIB) intensities originating from known galaxies and their faint companions at submillimeter wavelengths. Using the publicly available UltraVISTA catalog and maps at 250, 350, and 500 μm from the Herschel Multi-tiered Extragalactic Survey, we perform a novel measurement that exploits the fact that uncataloged sources may bias stacked flux densities—particularly if the resolution of the image is poor—and intentionally smooth the images before stacking and summing intensities. By smoothing the maps we are capturing the contribution of faint (undetected in ${K}_{S}\sim 23.4$) sources that are physically associated, or correlated, with the detected sources. We find that the cumulative CIB increases with increased smoothing, reaching 9.82 ± 0.78, 5.77 ± 0.43 and $2.32\pm 0.19\;{\mathrm{nWm}}^{-2}\;{\mathrm{sr}}^{-1}$ at 250, 350, and 500 μm at $300\;\mathrm{arcsec}$ FWHM. This corresponds to a fraction of the fiducial CIB of 0.94 ± 0.23, 1.07 ± 0.31, and 0.97 ± 0.26 at 250, 350, and 500 μm, where the uncertainties are dominated by those of the absolute CIB. We then propose, with a simple model combining parametric descriptions for stacked flux densities and stellar mass functions, that emission from galaxies with log($M/{M}_{\odot })\gt 8.5$ can account for most of the measured total intensities and argue against contributions from extended, diffuse emission. Finally, we discuss prospects for future survey instruments to improve the estimates of the absolute CIB levels, and observe any potentially remaining emission at $z\gt 4$.
Ade PAR, Aghanim N, Arnaud M, et al., 2015, Planck intermediate results XXIV. Constraints on variations in fundamental constants, Astronomy & Astrophysics, Vol: 580, ISSN: 1432-0746
Ade PAR, Aghanim N, Arnaud M, et al., 2015, Planck intermediate results XXIII. Galactic plane emission components derived from Planck with ancillary data, Astronomy & Astrophysics, Vol: 580, ISSN: 1432-0746
De Zotti G, Castex G, Gonzalez-Nuevo J, et al., 2015, Extragalactic sources in Cosmic Microwave Background maps, Journal of Cosmology and Astroparticle Physics, Vol: 2015, ISSN: 1475-7516
We discuss the potential of a next generation space-borne CMB experiment for studies of extragalactic sources with reference to COrE+, a project submitted to ESA in response to the call for a Medium-size mission (M4). We consider three possible options for the telescope size: 1 m, 1.5 m and 2 m (although the last option is probably impractical, given the M4 boundary conditions). The proposed instrument will be far more sensitive than Planck and will have a diffraction-limited angular resolution. These properties imply that even the 1 m telescope option will perform substantially better than Planck for studies of extragalactic sources. The source detection limits as a function of frequency have been estimated by means of realistic simulations taking into account all the relevant foregrounds. Predictions for the various classes of extragalactic sources are based on up-to-date models. The most significant improvements over Planck results are presented for each option. COrE+ will provide much larger samples of truly local star-forming galaxies (by about a factor of 8 for the 1 m telescope, of 17 for 1.5 m, of 30 for 2 m), making possible analyses of the properties of galaxies (luminosity functions, dust mass functions, star formation rate functions, dust temperature distributions, etc.) across the Hubble sequence. Even more interestingly, COrE+ will detect, at |b| > 30°, thousands of strongly gravitationally lensed galaxies (about 2,000, 6,000 and 13,000 for the 1 m, 1.5 m and 2 m options, respectively). Such large samples are of extraordinary astrophysical and cosmological value in many fields. Moreover, COrE+ high frequency maps will be optimally suited to pick up proto-clusters of dusty galaxies, i.e. to investigate the evolution of large scale structure at larger redshifts than can be reached by other means. Thanks to its high sensitivity COrE+ will also yield a spectacular advance in the blind detection of extragalactic sources in polarization: we expect tha
Wang L, Viero M, Ross NP, et al., 2015, Co-evolution of black hole growth and star formation from a cross-correlation analysis between quasars and the cosmic infrared background, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 449, Pages: 4476-4493, ISSN: 0035-8711
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- Citations: 16
Hopwood R, Polehampton ET, Valtchanov I, et al., 2015, Systematic characterization of the <i>Herschel</i> SPIRE Fourier Transform Spectrometer, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 449, Pages: 2274-2303, ISSN: 0035-8711
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- Citations: 19
Delvecchio I, Lutz D, Berta S, et al., 2015, Mapping the average AGN accretion rate in the SFR-<i>M</i><sub>*</sub> plane for <i>Herschel</i><SUP>☆</SUP>-selected galaxies at 0 < <i>z</i> ≤ 2.5, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 449, Pages: 373-389, ISSN: 0035-8711
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- Citations: 70
Carpineti A, Kaviraj S, Hyde AK, et al., 2015, An infrared study of local galaxy mergers, ASTRONOMY & ASTROPHYSICS, Vol: 577, ISSN: 0004-6361
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- Citations: 12
Podigachoski P, Barthel PD, Haas M, et al., 2015, Star formation in <i>z</i> > 1 3CR host galaxies as seen by <i>Herschel</i>, ASTRONOMY & ASTROPHYSICS, Vol: 575, ISSN: 0004-6361
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- Citations: 47
Clements DL, Greenslade J, 2015, Candidate high redshift clusters of dusty galaxies from herschel and planck, ISSN: 1743-9213
By examining Herschel images in the HerMES & H-ATLAS surveys at the position of Planck Catalog of Compact Source sources we are able to determine the nature of the Planck sources. Most are simply nearby, known, dusty galaxies, while others are foreground galactic 'cirrus' dust. About 11% of sources, though, appear to be groups or clumps of fainter Herschel objects. Followup of a number of these indicates that they are galaxy clusters or protoclusters at z ∼1-3 that contain a number of galaxies undergoing contemporaneous massive starbursts. These sources present challenges for current galaxy & cluster formation/evolution models.
Clements DL, 2015, Young Heat, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 105-127, ISBN: 978-1-482-23727-6
Clements DL, 2015, Infrared Astronomy - Seeing the Heat: From William Herschel to the Herschel Space Observatory, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, ISBN: 978-1-482-23727-6
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- Citations: 2
Clements DL, 2015, Feeling the Heat, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 29-53, ISBN: 978-1-482-23727-6
Clements DL, 2015, Local Heat, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 55-77, ISBN: 978-1-482-23727-6
Clements DL, 2015, Ancient Heat, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 159-192, ISBN: 978-1-482-23727-6
Clements DL, 2015, First Heat, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 193-220, ISBN: 978-1-482-23727-6
Clements DL, 2015, The Heat of the Stars, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 79-103, ISBN: 978-1-482-23727-6
Clements DL, 2015, Foreword: The Arp 220 Moment, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: XIX-+, ISBN: 978-1-482-23727-6
Clements DL, 2015, Distant Heat, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 129-158, ISBN: 978-1-482-23727-6
Clements DL, 2015, Infrared Astronomy - Seeing the Heat from <i>William Herschel to the Herschel Space Observatory</i> Preface, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: XXI-XXII, ISBN: 978-1-482-23727-6
Clements DL, 2015, Finding the Heat, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 1-28, ISBN: 978-1-482-23727-6
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- Citations: 5
Clements DL, 2015, Future Heat, INFRARED ASTRONOMY - SEEING THE HEAT: FROM WILLIAM HERSCHEL TO THE HERSCHEL SPACE OBSERVATORY, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 221-243, ISBN: 978-1-482-23727-6
Rowan-Robinson M, Wang L, Wardlow J, et al., 2014, Detailed modelling of a large sample of <i>Herschel</i> sources in the Lockman Hole: identification of cold dust and of lensing candidates through their anomalous SEDs, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 445, Pages: 3848-3861, ISSN: 0035-8711
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- Citations: 9
Calanog JA, Fu H, Cooray A, et al., 2014, LENS MODELS OF <i>HERSCHEL</i>-SELECTED GALAXIES FROM HIGH-RESOLUTION NEAR-IR OBSERVATIONS, ASTROPHYSICAL JOURNAL, Vol: 797, ISSN: 0004-637X
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- Citations: 39
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