We present an observational study of the effect of bars on the gas component and on the star formation properties of their host galaxies in a statistically significant sample of resolved objects, the Herschel Reference Sample. The analysis of optical and far-infrared images allows us to identify a clear spatial correlation between stellar bars and the cold-gas distribution mapped by the warm dust emission. We find that the infrared counterparts of optically identified bars are either bar-like structures or dead central regions in which star formation is strongly suppressed. Similar morphologies are found in the distribution of star formation directly traced by Hα maps. The sizes of such optical and infrared structures correlate remarkably well, hinting at a causal connection. In the light of previous observations and of theoretical investigations in the literature, we interpret our findings as further evidence of the scenario in which bars drive strong inflows toward their host nuclei: young bars are still in the process of perturbing the gas and star formation clearly delineates the shape of the bars; old bars on the contrary already removed any gas within their extents, carving a dead region of negligible star formation.

Consolandi, G., Dotti, M., Boselli, A., Gavazzi, G., & Gargiulo, F. (2017). Bars as seen by Herschel & Sloan. [Altro].

Bars as seen by Herschel & Sloan.

Consolandi G.;Dotti M.;Gavazzi G.;
2017

Abstract

We present an observational study of the effect of bars on the gas component and on the star formation properties of their host galaxies in a statistically significant sample of resolved objects, the Herschel Reference Sample. The analysis of optical and far-infrared images allows us to identify a clear spatial correlation between stellar bars and the cold-gas distribution mapped by the warm dust emission. We find that the infrared counterparts of optically identified bars are either bar-like structures or dead central regions in which star formation is strongly suppressed. Similar morphologies are found in the distribution of star formation directly traced by Hα maps. The sizes of such optical and infrared structures correlate remarkably well, hinting at a causal connection. In the light of previous observations and of theoretical investigations in the literature, we interpret our findings as further evidence of the scenario in which bars drive strong inflows toward their host nuclei: young bars are still in the process of perturbing the gas and star formation clearly delineates the shape of the bars; old bars on the contrary already removed any gas within their extents, carving a dead region of negligible star formation.
Altro
Si
Scientifica
Galaxies: evolution; Galaxies: star formation; Galaxies: structure
English
Scopus ID: 2-s2.0-85093179232 -
Consolandi, G., Dotti, M., Boselli, A., Gavazzi, G., & Gargiulo, F. (2017). Bars as seen by Herschel & Sloan. [Altro].
Consolandi, G; Dotti, M; Boselli, A; Gavazzi, G; Gargiulo, F
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/290542
Citazioni
  • Scopus 0
  • ???jsp.display-item.citation.isi??? ND
Social impact