Searching for HI around MHONGOOSE Galaxies via Spectral Stacking

S. Veronese; W. J. G. de Blok; J. Healy; D. Kleiner; A. Marasco; F. M. Maccagni; P. Kamphuis; E. Brinks; B. W. Holwerda; N. Zabel; L. Chemin; E. A. K. Adams; S. Kurapati; A. Sorgho; K. Spekkens; F. Combes; D. J. Pisano; F. Walter; P. Amram; F. Bigiel; O. I. Wong; E. Athanassoula

Searching for HI around MHONGOOSE Galaxies via Spectral Stacking

S. Veronese, W. J. G. de Blok, J. Healy, D. Kleiner, A. Marasco, F. M. Maccagni, P. Kamphuis, E. Brinks, B. W. Holwerda, N. Zabel, L. Chemin, E. A. K. Adams, S. Kurapati, A. Sorgho, K. Spekkens, F. Combes, D. J. Pisano, F. Walter, P. Amram, F. BigielO. I. Wong, E. Athanassoula

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Abstract

The observed star formation rates of galaxies in the Local Universe suggests that they are replenishing their gas reservoir across cosmic time. Cosmological simulations predict that this accretion of fresh gas can occur in a hot or a cold mode, yet the existence of low column density ($\sim10^{17}$ cm$^{-2}$) neutral atomic hydrogen (HI) tracing the cold mode has not been unambiguously confirmed by observations. We present the application of unconstrained spectral stacking to attempt to detect the emission from this HI in the Circum-Galactic Medium (CGM) and Inter-Galactic Medium (IGM) of 6 nearby star forming galaxies from the MHONGOOSE sample for which full-depth observations are available. Our stacking procedure consists of a standard spectral stacking algorithm coupled with a one-dimensional spectral line finder designed to extract reliable signal close to the noise level. In agreement with previous studies, we found that the amount of signal detected outside the HI disk is much smaller than implied by simulations. Furthermore, the column density limit that we achieve via stacking ($\sim10^{17}$ cm$^{-2}$) suggests that direct detection of the neutral CGM/IGM component might be challenging in the future, even with the next generation of radio telescopes.

Original language	English
Journal	Astronomy & Astrophysics
Publication status	Accepted/In press - 15 Nov 2024

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astro-ph.GA

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Accepted_ManuscriptAccepted author manuscript, 6.73 MBLicence: CC BY

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Veronese, S., de Blok, W. J. G., Healy, J., Kleiner, D., Marasco, A., Maccagni, F. M., Kamphuis, P., Brinks, E., Holwerda, B. W., Zabel, N., Chemin, L., Adams, E. A. K., Kurapati, S., Sorgho, A., Spekkens, K., Combes, F., Pisano, D. J., Walter, F., Amram, P., ... Athanassoula, E. (Accepted/In press). Searching for HI around MHONGOOSE Galaxies via Spectral Stacking. Astronomy & Astrophysics.

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title = "Searching for HI around MHONGOOSE Galaxies via Spectral Stacking",

abstract = " The observed star formation rates of galaxies in the Local Universe suggests that they are replenishing their gas reservoir across cosmic time. Cosmological simulations predict that this accretion of fresh gas can occur in a hot or a cold mode, yet the existence of low column density ($\sim10^{17}$ cm$^{-2}$) neutral atomic hydrogen (HI) tracing the cold mode has not been unambiguously confirmed by observations. We present the application of unconstrained spectral stacking to attempt to detect the emission from this HI in the Circum-Galactic Medium (CGM) and Inter-Galactic Medium (IGM) of 6 nearby star forming galaxies from the MHONGOOSE sample for which full-depth observations are available. Our stacking procedure consists of a standard spectral stacking algorithm coupled with a one-dimensional spectral line finder designed to extract reliable signal close to the noise level. In agreement with previous studies, we found that the amount of signal detected outside the HI disk is much smaller than implied by simulations. Furthermore, the column density limit that we achieve via stacking ($\sim10^{17}$ cm$^{-2}$) suggests that direct detection of the neutral CGM/IGM component might be challenging in the future, even with the next generation of radio telescopes. ",

keywords = "astro-ph.GA",

author = "S. Veronese and {de Blok}, {W. J. G.} and J. Healy and D. Kleiner and A. Marasco and Maccagni, {F. M.} and P. Kamphuis and E. Brinks and Holwerda, {B. W.} and N. Zabel and L. Chemin and Adams, {E. A. K.} and S. Kurapati and A. Sorgho and K. Spekkens and F. Combes and Pisano, {D. J.} and F. Walter and P. Amram and F. Bigiel and Wong, {O. I.} and E. Athanassoula",

year = "2024",

month = nov,

day = "15",

language = "English",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - Searching for HI around MHONGOOSE Galaxies via Spectral Stacking

AU - Veronese, S.

AU - de Blok, W. J. G.

AU - Healy, J.

AU - Kleiner, D.

AU - Marasco, A.

AU - Maccagni, F. M.

AU - Kamphuis, P.

AU - Brinks, E.

AU - Holwerda, B. W.

AU - Zabel, N.

AU - Chemin, L.

AU - Adams, E. A. K.

AU - Kurapati, S.

AU - Sorgho, A.

AU - Spekkens, K.

AU - Combes, F.

AU - Pisano, D. J.

AU - Walter, F.

AU - Amram, P.

AU - Bigiel, F.

AU - Wong, O. I.

AU - Athanassoula, E.

PY - 2024/11/15

Y1 - 2024/11/15

N2 - The observed star formation rates of galaxies in the Local Universe suggests that they are replenishing their gas reservoir across cosmic time. Cosmological simulations predict that this accretion of fresh gas can occur in a hot or a cold mode, yet the existence of low column density ($\sim10^{17}$ cm$^{-2}$) neutral atomic hydrogen (HI) tracing the cold mode has not been unambiguously confirmed by observations. We present the application of unconstrained spectral stacking to attempt to detect the emission from this HI in the Circum-Galactic Medium (CGM) and Inter-Galactic Medium (IGM) of 6 nearby star forming galaxies from the MHONGOOSE sample for which full-depth observations are available. Our stacking procedure consists of a standard spectral stacking algorithm coupled with a one-dimensional spectral line finder designed to extract reliable signal close to the noise level. In agreement with previous studies, we found that the amount of signal detected outside the HI disk is much smaller than implied by simulations. Furthermore, the column density limit that we achieve via stacking ($\sim10^{17}$ cm$^{-2}$) suggests that direct detection of the neutral CGM/IGM component might be challenging in the future, even with the next generation of radio telescopes.

AB - The observed star formation rates of galaxies in the Local Universe suggests that they are replenishing their gas reservoir across cosmic time. Cosmological simulations predict that this accretion of fresh gas can occur in a hot or a cold mode, yet the existence of low column density ($\sim10^{17}$ cm$^{-2}$) neutral atomic hydrogen (HI) tracing the cold mode has not been unambiguously confirmed by observations. We present the application of unconstrained spectral stacking to attempt to detect the emission from this HI in the Circum-Galactic Medium (CGM) and Inter-Galactic Medium (IGM) of 6 nearby star forming galaxies from the MHONGOOSE sample for which full-depth observations are available. Our stacking procedure consists of a standard spectral stacking algorithm coupled with a one-dimensional spectral line finder designed to extract reliable signal close to the noise level. In agreement with previous studies, we found that the amount of signal detected outside the HI disk is much smaller than implied by simulations. Furthermore, the column density limit that we achieve via stacking ($\sim10^{17}$ cm$^{-2}$) suggests that direct detection of the neutral CGM/IGM component might be challenging in the future, even with the next generation of radio telescopes.

KW - astro-ph.GA

M3 - Article

SN - 0004-6361

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

ER -

Searching for HI around MHONGOOSE Galaxies via Spectral Stacking

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