Skip to Main content Skip to Navigation
Journal articles

A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE): VI. Environmental quenching on HII-region scales

Abstract : The Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) is a blind narrow-band Hα + [NII] imaging survey of the Virgo cluster carried out with MegaCam at the Canada-French-Hawaii telescope. We use a new set of data extracted from VESTIGE to study the impact of the hostile cluster environment on the star formation process down to the scale of HII regions (∼50 pc). Here, HII regions are identified and their parameters measured using the HIIPHOT code on a sample of 114 late-type galaxies spanning a wide range in morphological type (Sa-Sd, Im, BCD), stellar mass (106.5 ≤ Mstar ≤ 1011 M⊙), and star formation activity (10−3 ≤ SFR ≤ 10 M⊙ yr−1). Owing to the exquisite average resolution of the VESTIGE data (0.65 arcsec), we detect 11302 HII regions with an Hα luminosity L(Hα) ≥ 1037 erg s−1. We show that the typical number of HII regions in gas-stripped objects is significantly lower than in healthy late-types of similar stellar mass. We also show that in these gas-stripped galaxies the number of HII regions significantly drops outside the effective radius, suggesting that the quenching process occurs outside-in, in agreement with other multifrequency observations. These new results consistently confirm that the main mechanism responsible for the decrease of the star formation activity observed in cluster galaxies is ram pressure, allowing us to discard other milder processes such as starvation or strangulation, which are unable to reproduce the observed radially truncated profiles.
Document type :
Journal articles
Complete list of metadatas

Cited literature [82 references]  Display  Hide  Download

https://hal-cea.archives-ouvertes.fr/cea-02460194
Contributor : Edp Sciences <>
Submitted on : Wednesday, January 29, 2020 - 9:29:42 PM
Last modification on : Saturday, October 17, 2020 - 3:08:55 AM
Long-term archiving on: : Thursday, April 30, 2020 - 7:30:25 PM

File

aa37310-19.pdf
Publication funded by an institution

Identifiers

Citation

A. Boselli, M. Fossati, A. Longobardi, S. Boissier, M. Boquien, et al.. A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE): VI. Environmental quenching on HII-region scales. Astronomy and Astrophysics - A&A, EDP Sciences, 2020, 634, pp.L1. ⟨10.1051/0004-6361/201937310⟩. ⟨cea-02460194⟩

Share

Metrics

Record views

276

Files downloads

652