Table · dataset · 2025
Parent dwarf galaxy sample from Apertif HI survey
Listed in IVOA Registry (Virtual Observatory)
Dwarf-dwarf galaxy encounters are a key aspect of galaxy evolution as they can ignite or temporarily suppress star formation in dwarfs and can lead to dwarf mergers.
Description
However, the frequency and impact of dwarf encounters remain poorly constrained due to limitations of spectroscopic studies, e.g. surface-brightness incompleteness of optical studies and poor spatial resolution of single-dish neutral hydrogen (HI) surveys.
We aim to quantify the frequency of isolated gas-rich dwarf galaxy multiples using the untargeted, interferometric Apertif HI survey and study the impact of the interaction on star formation rates of galaxies as a function of the on-sky separation. Our parent dwarf sample consists of 2481 gas-rich galaxies with stellar masses 10^6^<M*/M_{sun}_<5*10^9^, for which we identify close companions based on projected separation (r_p_) and systemic velocity difference (Del_V_sys).
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We explore both constant thresholds for r_p_ and Del_V_sys corresponding to 150kpc and 150km/s on all galaxies in our sample, and mass-dependent thresholds based on a stellar-to-halo mass relation. We find the average number of companions per dwarf in our sample to be 13% (20%) when considering mass-dependent (constant) thresholds. In the stellar mass regime of 2*10^8^<M*/M_{sun}_<5*10^9^, we find a three times higher frequency (11.6%) of dwarf companions than previously determined from optical spectroscopic studies, highlighting the power of HI for finding dwarf multiples.
Furthermore, we find evidence for an increase in star formation rates (SFRs) of close dwarf galaxy pairs of galaxies with similar stellar masses.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/703/A295 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...703A.295S ui.adsabs.harvard.edu/abs/2025A%26A...703A.295S ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/703/a295 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Radio
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/703/a295 | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:radio | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |