HST Imaging of Star-forming Clumps in Six GASP Ram-pressure-stripped Galaxies
Exploiting broad- and narrowband images of the Hubble Space Telescope from the near-UV to I -band rest frame, we study the star-forming clumps of six galaxies of the GASP sample undergoing strong ram pressure stripping. Clumps are detected in H α and near-UV, tracing star formation on different time...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acc5ee |
| _version_ | 1797699912087896064 |
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| author | Eric Giunchi Marco Gullieuszik Bianca M. Poggianti Alessia Moretti Ariel Werle Claudia Scarlata Anita Zanella Benedetta Vulcani Daniela Calzetti |
| author_facet | Eric Giunchi Marco Gullieuszik Bianca M. Poggianti Alessia Moretti Ariel Werle Claudia Scarlata Anita Zanella Benedetta Vulcani Daniela Calzetti |
| author_sort | Eric Giunchi |
| collection | DOAJ |
| description | Exploiting broad- and narrowband images of the Hubble Space Telescope from the near-UV to I -band rest frame, we study the star-forming clumps of six galaxies of the GASP sample undergoing strong ram pressure stripping. Clumps are detected in H α and near-UV, tracing star formation on different timescales. We consider clumps located in galaxy disks and stripped tails and formed in stripped gas but still close to the disk, called extraplanar. We detect 2406 H α -selected clumps (1708 in disks, 375 in extraplanar regions, and 323 in tails) and 3745 UV-selected clumps (2021 disk, 825 extraplanar, and 899 tail clumps). Only ∼15% of star-forming clumps are spatially resolved, meaning that most are smaller than ∼140 pc. We study the luminosity and size distribution functions (LDFs and SDFs, respectively) and the luminosity–size relation. The average LDF slope is 1.79 ± 0.09, while the average SDF slope is 3.1 ± 0.5. The results suggest that the star formation is turbulence-driven and scale-free, as in main-sequence galaxies. All of the clumps, whether they are in the disks or tails, have an enhanced H α luminosity at a given size, compared to the clumps in main-sequence galaxies. Indeed, their H α luminosity is closer to that of clumps in starburst galaxies, indicating that ram pressure is able to enhance the luminosity. No striking differences are found among disk and tail clumps, suggesting that the different environments in which they are embedded play a minor role in influencing the star formation. |
| first_indexed | 2024-03-12T04:14:42Z |
| format | Article |
| id | doaj.art-1f38b826c7e14dc1b276608657e9b745 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:14:42Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-1f38b826c7e14dc1b276608657e9b7452023-09-03T10:39:22ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194927210.3847/1538-4357/acc5eeHST Imaging of Star-forming Clumps in Six GASP Ram-pressure-stripped GalaxiesEric Giunchi0https://orcid.org/0000-0002-3818-1746Marco Gullieuszik1https://orcid.org/0000-0002-7296-9780Bianca M. Poggianti2https://orcid.org/0000-0001-8751-8360Alessia Moretti3https://orcid.org/0000-0002-1688-482XAriel Werle4https://orcid.org/0000-0002-4382-8081Claudia Scarlata5https://orcid.org/0000-0002-9136-8876Anita Zanella6https://orcid.org/0000-0001-8600-7008Benedetta Vulcani7https://orcid.org/0000-0003-0980-1499Daniela Calzetti8https://orcid.org/0000-0002-5189-8004INAF–Osservatorio astronomico di Padova , Vicolo Osservatorio 5, I-35122 Padova, Italy; Dipartimento di Fisica e Astronomia, Università di Padova , Vicolo Osservatorio 3, I-35122 Padova, ItalyINAF–Osservatorio astronomico di Padova , Vicolo Osservatorio 5, I-35122 Padova, ItalyINAF–Osservatorio astronomico di Padova , Vicolo Osservatorio 5, I-35122 Padova, ItalyINAF–Osservatorio astronomico di Padova , Vicolo Osservatorio 5, I-35122 Padova, ItalyINAF–Osservatorio astronomico di Padova , Vicolo Osservatorio 5, I-35122 Padova, ItalyMinnesota Institute for Astrophysics, School of Physics and Astronomy, University of Minnesota , 316 Church Street SE, Minneapolis, MN 55455, USAINAF–Osservatorio astronomico di Padova , Vicolo Osservatorio 5, I-35122 Padova, ItalyINAF–Osservatorio astronomico di Padova , Vicolo Osservatorio 5, I-35122 Padova, ItalyDepartment of Astronomy, University of Massachusetts , 710 North Pleasant Street, LGRT 619J, Amherst, MA 01002, USAExploiting broad- and narrowband images of the Hubble Space Telescope from the near-UV to I -band rest frame, we study the star-forming clumps of six galaxies of the GASP sample undergoing strong ram pressure stripping. Clumps are detected in H α and near-UV, tracing star formation on different timescales. We consider clumps located in galaxy disks and stripped tails and formed in stripped gas but still close to the disk, called extraplanar. We detect 2406 H α -selected clumps (1708 in disks, 375 in extraplanar regions, and 323 in tails) and 3745 UV-selected clumps (2021 disk, 825 extraplanar, and 899 tail clumps). Only ∼15% of star-forming clumps are spatially resolved, meaning that most are smaller than ∼140 pc. We study the luminosity and size distribution functions (LDFs and SDFs, respectively) and the luminosity–size relation. The average LDF slope is 1.79 ± 0.09, while the average SDF slope is 3.1 ± 0.5. The results suggest that the star formation is turbulence-driven and scale-free, as in main-sequence galaxies. All of the clumps, whether they are in the disks or tails, have an enhanced H α luminosity at a given size, compared to the clumps in main-sequence galaxies. Indeed, their H α luminosity is closer to that of clumps in starburst galaxies, indicating that ram pressure is able to enhance the luminosity. No striking differences are found among disk and tail clumps, suggesting that the different environments in which they are embedded play a minor role in influencing the star formation.https://doi.org/10.3847/1538-4357/acc5eeGalaxy clustersGalaxy evolutionStar formationStar forming regionsGalaxy structureGalaxy tails |
| spellingShingle | Eric Giunchi Marco Gullieuszik Bianca M. Poggianti Alessia Moretti Ariel Werle Claudia Scarlata Anita Zanella Benedetta Vulcani Daniela Calzetti HST Imaging of Star-forming Clumps in Six GASP Ram-pressure-stripped Galaxies The Astrophysical Journal Galaxy clusters Galaxy evolution Star formation Star forming regions Galaxy structure Galaxy tails |
| title | HST Imaging of Star-forming Clumps in Six GASP Ram-pressure-stripped Galaxies |
| title_full | HST Imaging of Star-forming Clumps in Six GASP Ram-pressure-stripped Galaxies |
| title_fullStr | HST Imaging of Star-forming Clumps in Six GASP Ram-pressure-stripped Galaxies |
| title_full_unstemmed | HST Imaging of Star-forming Clumps in Six GASP Ram-pressure-stripped Galaxies |
| title_short | HST Imaging of Star-forming Clumps in Six GASP Ram-pressure-stripped Galaxies |
| title_sort | hst imaging of star forming clumps in six gasp ram pressure stripped galaxies |
| topic | Galaxy clusters Galaxy evolution Star formation Star forming regions Galaxy structure Galaxy tails |
| url | https://doi.org/10.3847/1538-4357/acc5ee |
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