MIGHTEE-HI: HI galaxy properties in the large scale structure environment at z~0.37 from a stacking experiment
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| Format: | Preprint |
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2024
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| author | Sinigaglia, Francesco Rodighiero, Giulia Elson, Ed Bianchetti, Alessandro Vaccari, Mattia Maddox, Natasha Ponomareva, Anastasia A. Frank, Bradley S. Jarvis, Matt J. Catinella, Barbara Cortese, Luca Roychowdhury, Sambit Baes, Maarten Collier, Jordan D. Ilbert, Olivier Khostovan, Ali A. Kurapati, Sushma Pan, Hengxing Prandoni, Isabella Rajohnson, Sambatriniaina H. A. Salvato, Mara Sekhar, Srikrishna Sharma, Gauri |
| author_facet | Sinigaglia, Francesco Rodighiero, Giulia Elson, Ed Bianchetti, Alessandro Vaccari, Mattia Maddox, Natasha Ponomareva, Anastasia A. Frank, Bradley S. Jarvis, Matt J. Catinella, Barbara Cortese, Luca Roychowdhury, Sambit Baes, Maarten Collier, Jordan D. Ilbert, Olivier Khostovan, Ali A. Kurapati, Sushma Pan, Hengxing Prandoni, Isabella Rajohnson, Sambatriniaina H. A. Salvato, Mara Sekhar, Srikrishna Sharma, Gauri |
| contents | We present the first measurement of HI mass of star-forming galaxies in different large scale structure environments from a blind survey at $z\sim 0.37$. In particular, we carry out a spectral line stacking analysis considering $2875$ spectra of colour-selected star-forming galaxies undetected in HI at $0.23 < z < 0.49$ in the COSMOS field, extracted from the MIGHTEE-HI Early Science datacubes, acquired with the MeerKAT radio telescope. We stack galaxies belonging to different subsamples depending on three different definitions of large scale structure environment: local galaxy overdensity, position inside the host dark matter halo (central, satellite, or isolated), and cosmic web type (field, filament, or knot). We first stack the full star-forming galaxy sample and find a robust HI detection yielding an average galaxy HI mass of $M_{\rm HI}=(8.12\pm 0.75)\times 10^9\, {\rm M}_\odot$ at $\sim 11.8σ$. Next, we investigate the different subsamples finding a negligible difference in $M_{\rm HI}$ as a function of the galaxy overdensity. We report an HI excess compared to the full sample in satellite galaxies ($M_{\rm HI}=(11.31\pm1.22)\times 10^9$, at $\sim 10.2 σ$) and in filaments ($M_{\rm HI}=(11.62\pm 0.90)\times 10^9$. Conversely, we report non-detections for the central and knot galaxies subsamples, which appear to be HI-deficient. We find the same qualitative results also when stacking in units of HI fraction ($f_{\rm HI}$). We conclude that the HI amount in star-forming galaxies at the studied redshifts correlates with the large scale structure environment. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_00734 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | MIGHTEE-HI: HI galaxy properties in the large scale structure environment at z~0.37 from a stacking experiment Sinigaglia, Francesco Rodighiero, Giulia Elson, Ed Bianchetti, Alessandro Vaccari, Mattia Maddox, Natasha Ponomareva, Anastasia A. Frank, Bradley S. Jarvis, Matt J. Catinella, Barbara Cortese, Luca Roychowdhury, Sambit Baes, Maarten Collier, Jordan D. Ilbert, Olivier Khostovan, Ali A. Kurapati, Sushma Pan, Hengxing Prandoni, Isabella Rajohnson, Sambatriniaina H. A. Salvato, Mara Sekhar, Srikrishna Sharma, Gauri Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present the first measurement of HI mass of star-forming galaxies in different large scale structure environments from a blind survey at $z\sim 0.37$. In particular, we carry out a spectral line stacking analysis considering $2875$ spectra of colour-selected star-forming galaxies undetected in HI at $0.23 < z < 0.49$ in the COSMOS field, extracted from the MIGHTEE-HI Early Science datacubes, acquired with the MeerKAT radio telescope. We stack galaxies belonging to different subsamples depending on three different definitions of large scale structure environment: local galaxy overdensity, position inside the host dark matter halo (central, satellite, or isolated), and cosmic web type (field, filament, or knot). We first stack the full star-forming galaxy sample and find a robust HI detection yielding an average galaxy HI mass of $M_{\rm HI}=(8.12\pm 0.75)\times 10^9\, {\rm M}_\odot$ at $\sim 11.8σ$. Next, we investigate the different subsamples finding a negligible difference in $M_{\rm HI}$ as a function of the galaxy overdensity. We report an HI excess compared to the full sample in satellite galaxies ($M_{\rm HI}=(11.31\pm1.22)\times 10^9$, at $\sim 10.2 σ$) and in filaments ($M_{\rm HI}=(11.62\pm 0.90)\times 10^9$. Conversely, we report non-detections for the central and knot galaxies subsamples, which appear to be HI-deficient. We find the same qualitative results also when stacking in units of HI fraction ($f_{\rm HI}$). We conclude that the HI amount in star-forming galaxies at the studied redshifts correlates with the large scale structure environment. |
| title | MIGHTEE-HI: HI galaxy properties in the large scale structure environment at z~0.37 from a stacking experiment |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2403.00734 |