Family Prevention Programs

Gavazzi, Stephen M.

doi:10.1007/978-1-4419-8246-9_12

Cited by 19 publications

(56 citation statements)

References 34 publications

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“…Two of the lens systems presented here (HLock01, Section 6.7, Gavazzi et al 2011;and HXMM01, Section 6.11, H. Fu et al 2012, in preparation) have complex potentials with multiple deflectors. The primary focus of this paper is broad statistics, and therefore we do not present individual lens models or detailed properties of the foreground lensing galaxy or galaxies here.…”

Section: Individual Lens Candidatesmentioning

confidence: 97%

“…This includes the lensing magnification factor, μ, determined from modeling the best available data. The lens modeling is performed following the procedure outlined in Section 2.2 of Gavazzi et al (2011); we use the code sl_fit, which has been previously used to study galaxy-scale strong lensing (Gavazzi et al 2007(Gavazzi et al , 2008. The foreground lensing potential is modeled as a cored isothermal ellipsoid.…”

Section: Individual Lens Candidatesmentioning

confidence: 99%

“…Due to the potential for differential magnification (e.g., Gavazzi et al 2011;Fu et al 2012;Hezaveh et al 2012;Serjeant 2012), we note that these magnification estimates are only valid for the wavelength at which they are derived. Systems in which differential magnification could be important, as well as one case where modeling at both 2.2 and 880 μm shows that differential magnification is limited, are highlighted below.…”

Section: Individual Lens Candidatesmentioning

confidence: 99%

“…Additional gravitationally lensed SMGs have since been identified in other extragalactic surveys with the Spectral and Photometric Imaging Receiver (SPIRE; Griffin et al 2010;Swinyard et al 2010) on Herschel. These include the z = 2.957 HerMES source, HLock01 (Section 6.7; Conley et al 2011;Gavazzi et al 2011;Riechers et al 2011a;Scott et al 2011), and 40 Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Notes.…”

Section: Introductionmentioning

confidence: 99%

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HerMES: CANDIDATE GRAVITATIONALLY LENSED GALAXIES AND LENSING STATISTICS AT SUBMILLIMETER WAVELENGTHS

Wardlow

Cooray

Bernardis

et al. 2012

ApJ

177

230

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We present a list of 13 candidate gravitationally lensed submillimeter galaxies (SMGs) from 95 deg 2 of the Herschel Multi-tiered Extragalactic Survey, a surface density of 0.14 ± 0.04 deg −2. The selected sources have 500 μm flux densities (S 500) greater than 100 mJy. Gravitational lensing is confirmed by follow-up observations in 9 of the 13 systems (70%), and the lensing status of the four remaining sources is undetermined. We also present a supplementary sample of 29 (0.31 ± 0.06 deg −2) gravitationally lensed SMG candidates with S 500 = 80-100 mJy, which are expected to contain a higher fraction of interlopers than the primary candidates. The number counts of the candidate lensed galaxies are consistent with a simple statistical model of the lensing rate, which uses a foreground matter distribution, the intrinsic SMG number counts, and an assumed SMG redshift distribution. The model predicts that 32%-74% of our S 500 100 mJy candidates are strongly gravitationally lensed (μ 2), with the brightest sources being the most robust; this is consistent with the observational data. Our statistical model also 1

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Section: Individual Lens Candidatesmentioning

confidence: 97%

Section: Individual Lens Candidatesmentioning

confidence: 99%

Section: Individual Lens Candidatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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HerMES: CANDIDATE GRAVITATIONALLY LENSED GALAXIES AND LENSING STATISTICS AT SUBMILLIMETER WAVELENGTHS

Wardlow

Cooray

Bernardis

et al. 2012

ApJ

177

230

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“…An example of a lensed source found in early HerMES data is HERMES J105751.1+573027, a z = 2.957 galaxy multiply lensed by a foreground group of galaxies. Coupled with a lensing model derived from high‐resolution observations (Gavazzi et al ), the magnification and large image separation allowed us to investigate the continuum SED from the optical to FIR (Conley et al ), as well as model the CO line excitation (Scott et al ) and study the gas dynamics (Riechers et al ).…”

Section: Early and Anticipated Sciencementioning

confidence: 99%

TheHerschelMulti-tiered Extragalactic Survey: HerMES

Oliver

Bock

Altiéri

et al. 2012

Monthly Notices of the Royal Astronomical Society

734

615

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The Herschel Multi‐tiered Extragalactic Survey (HerMES) is a legacy programme designed to map a set of nested fields totalling ∼380 deg2. Fields range in size from 0.01 to ∼20 deg2, using the Herschel‐Spectral and Photometric Imaging Receiver (SPIRE) (at 250, 350 and 500 μm) and the Herschel‐Photodetector Array Camera and Spectrometer (PACS) (at 100 and 160 μm), with an additional wider component of 270 deg2 with SPIRE alone. These bands cover the peak of the redshifted thermal spectral energy distribution from interstellar dust and thus capture the reprocessed optical and ultraviolet radiation from star formation that has been absorbed by dust, and are critical for forming a complete multiwavelength understanding of galaxy formation and evolution. The survey will detect of the order of 100 000 galaxies at 5σ in some of the best‐studied fields in the sky. Additionally, HerMES is closely coordinated with the PACS Evolutionary Probe survey. Making maximum use of the full spectrum of ancillary data, from radio to X‐ray wavelengths, it is designed to facilitate redshift determination, rapidly identify unusual objects and understand the relationships between thermal emission from dust and other processes. Scientific questions HerMES will be used to answer include the total infrared emission of galaxies, the evolution of the luminosity function, the clustering properties of dusty galaxies and the properties of populations of galaxies which lie below the confusion limit through lensing and statistical techniques. This paper defines the survey observations and data products, outlines the primary scientific goals of the HerMES team, and reviews some of the early results.

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Extensive light profile fitting of galaxy-scale strong lenses

Brault

Gavazzi

2015

A&A

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Aims. We investigate the merits of a massive forward modeling of ground-based optical imaging as a diagnostic for the strong lensing nature of Early-Type Galaxies, in the light of which blurred and faint Einstein rings can hide. Methods. We simulate several thousand mock strong lenses under ground-and space-based conditions as arising from the deflection of an exponential disk by a foreground de Vaucouleurs light profile whose lensing potential is described by a Singular Isothermal Ellipsoid. We then fit for the lensed light distribution with sl_fit after having subtracted the foreground light emission off (ideal case) and also after having fitted the deflector's light with galfit. By setting thresholds in the output parameter space, we can decide the lens/not-a-lens status of each system. We finally apply our strategy to a sample of 517 lens candidates present in the CFHTLS data to test the consistency of our selection approach. Results. The efficiency of the fast modeling method at recovering the main lens parameters like Einstein radius, total magnification or total lensed flux, is quite comparable under CFHT and HST conditions when the deflector is perfectly subtracted off (only possible in simulations), fostering a sharp distinction between the good and the bad candidates. Conversely, for a more realistic subtraction, a substantial fraction of the lensed light is absorbed into the deflector's model, which biases the subsequent fitting of the rings and then disturbs the selection process. We quantify completeness and purity of the lens finding method in both cases.Conclusions. This suggests that the main limitation currently resides in the subtraction of the foreground light. Provided further enhancement of the latter, the direct forward modeling of large numbers of galaxy-galaxy strong lenses thus appears tractable and could constitute a competitive lens finder in the next generation of wide-field imaging surveys.

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Family Prevention Programs

Cited by 19 publications

References 34 publications

HerMES: CANDIDATE GRAVITATIONALLY LENSED GALAXIES AND LENSING STATISTICS AT SUBMILLIMETER WAVELENGTHS

HerMES: CANDIDATE GRAVITATIONALLY LENSED GALAXIES AND LENSING STATISTICS AT SUBMILLIMETER WAVELENGTHS

TheHerschelMulti-tiered Extragalactic Survey: HerMES

Extensive light profile fitting of galaxy-scale strong lenses

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