The second Herschel–ATLAS Data Release – III. Optical and near-infrared counterparts in the North Galactic Plane field

Furlanetto, C.; Dye, S.; Bourne, N.; Maddox, Steve; Dunne, L.; Eales, Stephen Anthony; Valiante, Elisabetta; Smith, M.; Smith, Daniel; Ivison, R. J.; Ibar, E.

doi:10.1093/mnras/sty151

Cited by 18 publications

(45 citation statements)

References 46 publications

(45 reference statements)

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“…Throughout this paper, we count an optical/near-IR counterpart with R > 0.8 as a probable counterpart, although we note that this only represents an 80% probability. et al (2016) and Furlanetto et al (2018) have looked for optical counterparts to the H-ATLAS sources on the SDSS r-band images, the former for the GAMA fields and the latter for the NGP (the SGP field is not covered by the SDSS). 121 HerBS sources fall in these fields, 72 in GAMA and 49 in NGP.…”

Section: The Identification Methodsmentioning

confidence: 99%

“…In the first method, we use the new f (r) to calculate the number of missed counterparts analytically. In the second method, we repeat the entire method used by Bourne et al (2016) and Furlanetto et al (2018) using our new version of f (r) and recalculating the reliability for each potential counterpart.…”

Section: The Effect Of Gravitational Lensing On the Sdss Likelihood Amentioning

confidence: 99%

“…The blue points show the lensing fraction for the HerBS sources covered by VIKING. The grey points show the lensing fraction of HerBS sources with SDSS counterparts, using the results from Bourne et al (2016) and Furlanetto et al (2018), and the orange points show the lensing fraction of HerBS sources with SDSS counterparts calculated with their lensing-corrected reliabilities using the model described in the Section 3. The upper limits (red ) are from the fraction of HerBS sources without any VIKING galaxy visible at r < 10 arcsec.…”

Section: The Lensing Nature Of Optical and Near-ir Counterpartsmentioning

confidence: 99%

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A search for the lenses in the Herschel Bright Sources (HerBS) sample

Bakx

Eales

Amvrosiadis

2020

Monthly Notices of the Royal Astronomical Society

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Verifying that sub-mm galaxies (SMGs) are gravitationally lensed requires timeexpensive observations with over-subscribed high-resolution observatories. Here, we aim to strengthen the evidence of gravitational lensing within the Herschel Bright Sources (HerBS) by cross-comparing their positions to optical (SDSS) and nearinfrared (VIKING) surveys, in order to search for the foreground lensing galaxy candidates. Resolved observations of the brightest HerBS sources have already shown that most are lensed, and a galaxy evolution model predicts that ∼76 % of the total HerBS sources are lensed, although with the SDSS survey we are only able to identify the likely foreground lenses for 25 % of the sources. With the near-infrared VIKING survey, however, we are able to identify the likely foreground lenses for 57 % of the sources, and we estimate that 82 % of the HerBS sources have lenses on the VIKING images even if we cannot identify the lens in every case. We find that the angular offsets between lens and Herschel source are larger than that expected if the lensing is done by individual galaxies. We also find that the fraction of HerBS sources that are lensed falls with decreasing 500-micron flux density, which is expected from the galaxy evolution model. Finally, we apply our statistical VIKING cross-identification to the entire Herschel -ATLAS catalogue, where we also find that the number of lensed sources falls with decreasing 500-micron flux density.

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Section: The Identification Methodsmentioning

confidence: 99%

Section: The Effect Of Gravitational Lensing On the Sdss Likelihood Amentioning

confidence: 99%

Section: The Lensing Nature Of Optical and Near-ir Counterpartsmentioning

confidence: 99%

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A search for the lenses in the Herschel Bright Sources (HerBS) sample

Bakx

Eales

Amvrosiadis

2020

Monthly Notices of the Royal Astronomical Society

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“…The survey is comprised of five different fields, three of which are located on the celestial equator (GAMA fields or G09, G12 and G15; Valiante et al 2016;Bourne et al 2016;Rigby et al 2011;Pascale et al 2011;Ibar et al 2010) covering in total an area of 161.6 deg 2 . The other two fields are centred on the North and South Galactic Poles (NGP and SGP fields; Smith et al 2017;Maddox et al 2018;Furlanetto et al 2018) covering areas of 180.1 deg 2 and 317.6 deg 2 , respectively. As described in detail in Bourne et al (2016), for the GAMA fields, and Furlanetto et al (2018), for the NGP field, a likelihood ratio method was used to identify counterparts in the Sloan Digital Sky Survey (SDSS; Abazajian et al 2009) within a search radius of 10 arcsec of the H-ATLAS sources with a 4σ detection at 250 µm.…”

Section: Datamentioning

confidence: 99%

SHALOS: StatisticalHerschel-ATLAS lensed objects selection

González‐Nuevo

Gómez

Bonavera

et al. 2019

A&A

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Context. The statistical analysis of large sample of strong lensing events can be a powerful tool to extract astrophysical and/or cosmological valuable information. However, the number of such events is still relatively low, mostly because of the lengthily observational validation process on individual events. Aims. In this work we propose a new methodology with a statistical selection approach in order to increase by a factor of ∼ 5 the number of such events. Although the methodology can be applied to address several selection problems, it has particular benefits in the case of the identification of strongly lensed galaxies: objectivity, minimal initial constrains in the main parameter space, preservation of the statistical properties. Methods. The proposed methodology is based on the Bhattacharyya distance as a measure of the similarity between probability distributions of properties of two different cross-matched galaxies. The particular implementation for the aim of this work is called SHALOS and it combines the information of four different properties of the pair of galaxies: angular separation, luminosity percentile, redshift and optical/sub-mm flux density ratio. Results. The SHALOS method provided a ranked list of strongly lensed galaxies. The number of candidates for the final associated probability, P tot > 0.7, is 447 with an estimated mean amplification factor of 3.12 for an halo with a typical cluster mass. Additional statistical properties of the SHALOS candidates, as the correlation function or the source number counts, are in agreement with previous results indicating the statistical lensing nature of the selected sample.

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“…In this paper, we describe the production and properties of the catalogs of far-infrared and submillimeter sources detected in these images. A third paper (Furlanetto et al 2018, hereafter F18) describes a search for the optical/near-infrared counterparts to the Herschel sources in the NGP field and the resulting multi-wavelength catalog. The catalogs described in this paper can be obtained from the H-ATLAS website (http:// www.h-atlas.org).…”

Section: Introductionmentioning

confidence: 99%

The Herschel -ATLAS Data Release 2. Paper II. Catalogs of Far-infrared and Submillimeter Sources in the Fields at the South and North Galactic Poles

Maddox

Valiante

Cigan

et al. 2018

ApJS

Self Cite

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The Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) is a survey of 660 deg 2 with the PACS and SPIRE cameras in five photometric bands: 100, 160, 250, 350, and 500 μm. This is the second of three papers describing the data release for the large fields at the south and north Galactic poles (NGP and SGP). In this paper we describe the catalogs of far-infrared and submillimeter sources for the NGP and SGP, which cover 177.1 deg 2 and 303.4 deg 2 , respectively. The catalogs contain 118,908 sources for the NGP field and 193,527 sources for the SGP field detected at more than 4σ significance in any of the 250, 350, or 500 μmbands. The source detection is based on the 250 μm map, and we present photometry in all five bands for each source, including aperture photometry for sources known to be extended. The rms positional accuracy for the faintest sources is about 2.4 arcsec in both R.A. and decl. We present a statistical analysis of the catalogs and discuss the practical issuescompleteness, reliability, flux boosting, accuracy of positions, accuracy of flux measurements-necessary to use the catalogs for astronomical projects.

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The second Herschel–ATLAS Data Release – III. Optical and near-infrared counterparts in the North Galactic Plane field

Cited by 18 publications

References 46 publications

A search for the lenses in the Herschel Bright Sources (HerBS) sample

A search for the lenses in the Herschel Bright Sources (HerBS) sample

SHALOS: StatisticalHerschel-ATLAS lensed objects selection

The Herschel -ATLAS Data Release 2. Paper II. Catalogs of Far-infrared and Submillimeter Sources in the Fields at the South and North Galactic Poles

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