Chiles: H I morphology and galaxy environment at z = 0.12 and z = 0.17

Kelley M. Hess, Nicholas M. Luber, Ximena Fernández, Hansung B. Gim, J. H. Van Gorkom, Emmanuel Momjian, Julia Gross, Martin Meyer, Attila Popping, Luke J.M. Davies, Lucas Hunt, Kathryn Kreckel, Danielle Lucero, D. J. Pisano, Monica Sanchez-Barrantes, Min S. Yun, Richard Dodson, Kevin Vinsen, Andreas Wicenec, Chen Wu & 10 others Matthew A. Bershady, Aeree Chung, Julie D. Davis, Jennifer Donovan Meyer, Patricia Henning, Natasha Maddox, Evan T. Smith, J. M. Van Der Hulst, Marc A.W. Verheijen, Eric M. Wilcots

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We present a study of 16 H I-detected galaxies found in 178 h of observations from Epoch 1 of the COSMOS H I Large Extragalactic Survey (CHILES). We focus on two redshift ranges between 0.108 ≤ z ≤ 0.127 and 0.162 ≤ z ≤ 0.183 which are among the worst affected by radio frequency interference (RFI). While this represents only 10 per cent of the total frequency coverage and 18 per cent of the total expected time on source compared to what will be the full CHILES survey, we demonstrate that our data reduction pipeline recovers high-quality data even in regions severely impacted by RFI. We report on our in-depth testing of an automated spectral line source finder to produce H I total intensity maps which we present side-by-side with significance maps to evaluate the reliability of the morphology recovered by the source finder. We recommend that this become a common place manner of presenting data from upcoming H I surveys of resolved objects. We use the COSMOS 20k group catalogue and extract the filamentary structure using the topological DisPerSE algorithm to evaluate the H I morphology in the context of both local and large-scale environments and we discuss the shortcomings of both methods. Many of the detections show disturbed H I morphologies suggesting they have undergone a recent interaction which is not evident from deep optical imaging alone. Overall, the sample showcases the broad range of ways in which galaxies interact with their environment. This is a first look at the population of galaxies and their local and large-scale environments observed in H I by CHILES at redshifts beyond the z = 0.1 Universe.

Original languageEnglish
Pages (from-to)2234-2256
Number of pages23
JournalMonthly Notices of the Royal Astronomical Society
Volume484
Issue number2
DOIs
Publication statusPublished - 1 Jan 2019

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Chile
galaxies
radio frequency interference
radio
data reduction
data quality
catalogs
line spectra
universe
time measurement
COSMOS
interactions

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Hess, K. M., Luber, N. M., Fernández, X., Gim, H. B., Van Gorkom, J. H., Momjian, E., ... Wilcots, E. M. (2019). Chiles: H I morphology and galaxy environment at z = 0.12 and z = 0.17. Monthly Notices of the Royal Astronomical Society, 484(2), 2234-2256. https://doi.org/10.1093/mnras/sty3421
Hess, Kelley M. ; Luber, Nicholas M. ; Fernández, Ximena ; Gim, Hansung B. ; Van Gorkom, J. H. ; Momjian, Emmanuel ; Gross, Julia ; Meyer, Martin ; Popping, Attila ; Davies, Luke J.M. ; Hunt, Lucas ; Kreckel, Kathryn ; Lucero, Danielle ; Pisano, D. J. ; Sanchez-Barrantes, Monica ; Yun, Min S. ; Dodson, Richard ; Vinsen, Kevin ; Wicenec, Andreas ; Wu, Chen ; Bershady, Matthew A. ; Chung, Aeree ; Davis, Julie D. ; Meyer, Jennifer Donovan ; Henning, Patricia ; Maddox, Natasha ; Smith, Evan T. ; Van Der Hulst, J. M. ; Verheijen, Marc A.W. ; Wilcots, Eric M. / Chiles : H I morphology and galaxy environment at z = 0.12 and z = 0.17. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 484, No. 2. pp. 2234-2256.
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abstract = "We present a study of 16 H I-detected galaxies found in 178 h of observations from Epoch 1 of the COSMOS H I Large Extragalactic Survey (CHILES). We focus on two redshift ranges between 0.108 ≤ z ≤ 0.127 and 0.162 ≤ z ≤ 0.183 which are among the worst affected by radio frequency interference (RFI). While this represents only 10 per cent of the total frequency coverage and 18 per cent of the total expected time on source compared to what will be the full CHILES survey, we demonstrate that our data reduction pipeline recovers high-quality data even in regions severely impacted by RFI. We report on our in-depth testing of an automated spectral line source finder to produce H I total intensity maps which we present side-by-side with significance maps to evaluate the reliability of the morphology recovered by the source finder. We recommend that this become a common place manner of presenting data from upcoming H I surveys of resolved objects. We use the COSMOS 20k group catalogue and extract the filamentary structure using the topological DisPerSE algorithm to evaluate the H I morphology in the context of both local and large-scale environments and we discuss the shortcomings of both methods. Many of the detections show disturbed H I morphologies suggesting they have undergone a recent interaction which is not evident from deep optical imaging alone. Overall, the sample showcases the broad range of ways in which galaxies interact with their environment. This is a first look at the population of galaxies and their local and large-scale environments observed in H I by CHILES at redshifts beyond the z = 0.1 Universe.",
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Hess, KM, Luber, NM, Fernández, X, Gim, HB, Van Gorkom, JH, Momjian, E, Gross, J, Meyer, M, Popping, A, Davies, LJM, Hunt, L, Kreckel, K, Lucero, D, Pisano, DJ, Sanchez-Barrantes, M, Yun, MS, Dodson, R, Vinsen, K, Wicenec, A, Wu, C, Bershady, MA, Chung, A, Davis, JD, Meyer, JD, Henning, P, Maddox, N, Smith, ET, Van Der Hulst, JM, Verheijen, MAW & Wilcots, EM 2019, 'Chiles: H I morphology and galaxy environment at z = 0.12 and z = 0.17' Monthly Notices of the Royal Astronomical Society, vol. 484, no. 2, pp. 2234-2256. https://doi.org/10.1093/mnras/sty3421

Chiles : H I morphology and galaxy environment at z = 0.12 and z = 0.17. / Hess, Kelley M.; Luber, Nicholas M.; Fernández, Ximena; Gim, Hansung B.; Van Gorkom, J. H.; Momjian, Emmanuel; Gross, Julia; Meyer, Martin; Popping, Attila; Davies, Luke J.M.; Hunt, Lucas; Kreckel, Kathryn; Lucero, Danielle; Pisano, D. J.; Sanchez-Barrantes, Monica; Yun, Min S.; Dodson, Richard; Vinsen, Kevin; Wicenec, Andreas; Wu, Chen; Bershady, Matthew A.; Chung, Aeree; Davis, Julie D.; Meyer, Jennifer Donovan; Henning, Patricia; Maddox, Natasha; Smith, Evan T.; Van Der Hulst, J. M.; Verheijen, Marc A.W.; Wilcots, Eric M.

In: Monthly Notices of the Royal Astronomical Society, Vol. 484, No. 2, 01.01.2019, p. 2234-2256.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Chiles

T2 - H I morphology and galaxy environment at z = 0.12 and z = 0.17

AU - Hess, Kelley M.

AU - Luber, Nicholas M.

AU - Fernández, Ximena

AU - Gim, Hansung B.

AU - Van Gorkom, J. H.

AU - Momjian, Emmanuel

AU - Gross, Julia

AU - Meyer, Martin

AU - Popping, Attila

AU - Davies, Luke J.M.

AU - Hunt, Lucas

AU - Kreckel, Kathryn

AU - Lucero, Danielle

AU - Pisano, D. J.

AU - Sanchez-Barrantes, Monica

AU - Yun, Min S.

AU - Dodson, Richard

AU - Vinsen, Kevin

AU - Wicenec, Andreas

AU - Wu, Chen

AU - Bershady, Matthew A.

AU - Chung, Aeree

AU - Davis, Julie D.

AU - Meyer, Jennifer Donovan

AU - Henning, Patricia

AU - Maddox, Natasha

AU - Smith, Evan T.

AU - Van Der Hulst, J. M.

AU - Verheijen, Marc A.W.

AU - Wilcots, Eric M.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - We present a study of 16 H I-detected galaxies found in 178 h of observations from Epoch 1 of the COSMOS H I Large Extragalactic Survey (CHILES). We focus on two redshift ranges between 0.108 ≤ z ≤ 0.127 and 0.162 ≤ z ≤ 0.183 which are among the worst affected by radio frequency interference (RFI). While this represents only 10 per cent of the total frequency coverage and 18 per cent of the total expected time on source compared to what will be the full CHILES survey, we demonstrate that our data reduction pipeline recovers high-quality data even in regions severely impacted by RFI. We report on our in-depth testing of an automated spectral line source finder to produce H I total intensity maps which we present side-by-side with significance maps to evaluate the reliability of the morphology recovered by the source finder. We recommend that this become a common place manner of presenting data from upcoming H I surveys of resolved objects. We use the COSMOS 20k group catalogue and extract the filamentary structure using the topological DisPerSE algorithm to evaluate the H I morphology in the context of both local and large-scale environments and we discuss the shortcomings of both methods. Many of the detections show disturbed H I morphologies suggesting they have undergone a recent interaction which is not evident from deep optical imaging alone. Overall, the sample showcases the broad range of ways in which galaxies interact with their environment. This is a first look at the population of galaxies and their local and large-scale environments observed in H I by CHILES at redshifts beyond the z = 0.1 Universe.

AB - We present a study of 16 H I-detected galaxies found in 178 h of observations from Epoch 1 of the COSMOS H I Large Extragalactic Survey (CHILES). We focus on two redshift ranges between 0.108 ≤ z ≤ 0.127 and 0.162 ≤ z ≤ 0.183 which are among the worst affected by radio frequency interference (RFI). While this represents only 10 per cent of the total frequency coverage and 18 per cent of the total expected time on source compared to what will be the full CHILES survey, we demonstrate that our data reduction pipeline recovers high-quality data even in regions severely impacted by RFI. We report on our in-depth testing of an automated spectral line source finder to produce H I total intensity maps which we present side-by-side with significance maps to evaluate the reliability of the morphology recovered by the source finder. We recommend that this become a common place manner of presenting data from upcoming H I surveys of resolved objects. We use the COSMOS 20k group catalogue and extract the filamentary structure using the topological DisPerSE algorithm to evaluate the H I morphology in the context of both local and large-scale environments and we discuss the shortcomings of both methods. Many of the detections show disturbed H I morphologies suggesting they have undergone a recent interaction which is not evident from deep optical imaging alone. Overall, the sample showcases the broad range of ways in which galaxies interact with their environment. This is a first look at the population of galaxies and their local and large-scale environments observed in H I by CHILES at redshifts beyond the z = 0.1 Universe.

KW - Galaxies: evolution

KW - Galaxies: groups: general

KW - Galaxies: ISM

KW - Radio lines: galaxies

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U2 - 10.1093/mnras/sty3421

DO - 10.1093/mnras/sty3421

M3 - Article

VL - 484

SP - 2234

EP - 2256

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

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Hess KM, Luber NM, Fernández X, Gim HB, Van Gorkom JH, Momjian E et al. Chiles: H I morphology and galaxy environment at z = 0.12 and z = 0.17. Monthly Notices of the Royal Astronomical Society. 2019 Jan 1;484(2):2234-2256. https://doi.org/10.1093/mnras/sty3421