The faint end of the UV luminosity function at $0.4 < z < 0.7$ from the Hubble Frontier Fields
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866908829452599296 |
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| author | Sun, Lei Meng, Xiao-Lei Wang, Xin Zhan, Hu Alavi, Anahita Leethochawalit, Nicha Siana, Brian Zhou, Hang Wang, Shengzhe Hailanhazi, Shamuhawu |
| author_facet | Sun, Lei Meng, Xiao-Lei Wang, Xin Zhan, Hu Alavi, Anahita Leethochawalit, Nicha Siana, Brian Zhou, Hang Wang, Shengzhe Hailanhazi, Shamuhawu |
| contents | By extending the Hubble Frontier Fields (HFF) observations to the F225W band using HST WFC3/UVIS, we measure the rest-frame UV luminosity function (LF) of galaxies at $0.4 < z < 0.7$, pushing into the low-luminosity galaxy regime. In this first paper of a series, we describe the HST Cycle-27 GO-15940 F225W observations and data reduction, and present a corresponding catalog for the Abell 2744 field, which is the most data-rich HFF cluster field. Combining deep Near-UV imaging and the high magnification from strong gravitational lensing of the foreground cluster, we identify 152 faint galaxies with $-19.5 < M_{UV} < -12.1$ at $0.4 < z < 0.7$ through hybrid photometric-spectroscopic redshift selection from the Abell 2744 F225W catalog. Using a sample defined by a $50\%$ completeness cut and applying the maximum likelihood estimation, we derive the best-fit Schechter parameters for the UV LF at $z \sim 0.55$ down to $M_\text{UV} < -13.5$ mag, including a faint-end slope of $α= -1.324^{+0.072}_{-0.074}$. We incorporate a curvature parameter $δ$ in parameter estimation to account for a possible turn-over at the faint end of the UV LF, leveraging the exceedingly low luminosities probed by our sample. Our results rule out a turn-over brighter than $M_{UV} = -15.5$ at the $3σ$ confidence level. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_11681 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The faint end of the UV luminosity function at $0.4 < z < 0.7$ from the Hubble Frontier Fields Sun, Lei Meng, Xiao-Lei Wang, Xin Zhan, Hu Alavi, Anahita Leethochawalit, Nicha Siana, Brian Zhou, Hang Wang, Shengzhe Hailanhazi, Shamuhawu Astrophysics of Galaxies By extending the Hubble Frontier Fields (HFF) observations to the F225W band using HST WFC3/UVIS, we measure the rest-frame UV luminosity function (LF) of galaxies at $0.4 < z < 0.7$, pushing into the low-luminosity galaxy regime. In this first paper of a series, we describe the HST Cycle-27 GO-15940 F225W observations and data reduction, and present a corresponding catalog for the Abell 2744 field, which is the most data-rich HFF cluster field. Combining deep Near-UV imaging and the high magnification from strong gravitational lensing of the foreground cluster, we identify 152 faint galaxies with $-19.5 < M_{UV} < -12.1$ at $0.4 < z < 0.7$ through hybrid photometric-spectroscopic redshift selection from the Abell 2744 F225W catalog. Using a sample defined by a $50\%$ completeness cut and applying the maximum likelihood estimation, we derive the best-fit Schechter parameters for the UV LF at $z \sim 0.55$ down to $M_\text{UV} < -13.5$ mag, including a faint-end slope of $α= -1.324^{+0.072}_{-0.074}$. We incorporate a curvature parameter $δ$ in parameter estimation to account for a possible turn-over at the faint end of the UV LF, leveraging the exceedingly low luminosities probed by our sample. Our results rule out a turn-over brighter than $M_{UV} = -15.5$ at the $3σ$ confidence level. |
| title | The faint end of the UV luminosity function at $0.4 < z < 0.7$ from the Hubble Frontier Fields |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2602.11681 |