HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE): III. Star formation in the stripped gas of NGC 4254

Abstract : During pilot observations of the Virgo Environmental Survey Tracing Galaxy Evolution (VESTIGE), a blind narrow-band Hα + [NII] imaging survey of the Virgo cluster carried out with MegaCam at the CFHT, we have observed the spiral galaxy NGC 4254 (M99). Deep Hα + [NII] narrow-band and GALEX UV images reveal the presence of 60 compact (70–500 pc radius) star-forming regions up to ≃20 kpc outside the optical disc of the galaxy. These regions are located along a tail of HI gas stripped from the disc of the galaxy after a rapid gravitational encounter with another Virgo cluster member that simulations indicate occurred 280–750 Myr ago. We have combined the VESTIGE data with multifrequency data from the UV to the far-infrared to characterise the stellar populations of these regions and study the star formation process in an extreme environment such as the tails of stripped gas embedded in the hot intracluster medium. The colour, spectral energy distribution (SED), and linear size consistently indicate that these regions are coeval and have been formed after a single burst of star formation that occurred ≲100 Myr ago. These regions might become free floating objects within the cluster potential well, and be the local analogues of compact sources produced after the interaction of gas-rich systems that occurred during the early formation of clusters.
Document type :
Journal articles
Complete list of metadata

Cited literature [168 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-03000032
Contributor : Edp Sciences Connect in order to contact the contributor
Submitted on : Wednesday, November 11, 2020 - 1:38:21 PM
Last modification on : Tuesday, January 4, 2022 - 5:37:53 AM

File

aa32410-17.pdf
Publication funded by an institution

Identifiers

Citation

A. Boselli, M. Fossati, J. C. Cuillandre, S. Boissier, M. Boquien, et al.. A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE): III. Star formation in the stripped gas of NGC 4254. Astronomy and Astrophysics - A&A, EDP Sciences, 2018, 615, pp.A114. ⟨10.1051/0004-6361/201732410⟩. ⟨hal-03000032⟩

Share

Metrics

Record views

32

Files downloads

15