| Name | OT1_pguillar_1 |
| Title | Dust in shocks and star-forming regions outside galaxies: PACS and SPIRE photometry of Stephan.s Quintet |
| URL | |
| DOI | https://doi.org/10.5270/esa-760h7vw |
| Author | guillard, p. |
| Description | Stephan.s Quintet (SQ) is an extensively studied compact group of galaxies, where tidal interactions have displaced large amounts of gas into the inter-galactic medium (IGM). Spitzer IRS observations revealed an extremely bright H2 line emission from warm molecular gas, coexisting with a giant (40 kpc), X-ray bright shock, attributed to a high-speed (1000 km/s) galaxy collision. The weakness of PAH and mid-IR dust continuum shows that the H2 gas is not associated with star formation (SF) in the shock, in sharp contrast with standard galaxies. Spitzer photometry suggests that most of the SF rather happens outside the center of the shock and galatic disks. Moreover, an extended FIR component, not connected with the galaxies, but coincident with the X-ray halo of the group, may have been revealed by MIPS, but its poor resolution make this identification difficult. This dust may contribute to cool the hot gas, and thus to fuel SF in the halo. In this context of understanding the processes that control SF in the group, we propose to map the thermal dust emission in all the PACS and SPIRE bands. This will allows for the first time to (1) estimate the total cold gas content in the IGM independently from our CO measurements, (2) make use of the Herschel high spatial resolution to separate the dust emission coming from SF regions, the shock, and the X-ray halo, in order to elucidate the origin of the dust emission in the group and its potential role in cooling the intra-cluster gas, and (3) compare the FIR SED in the different regions of the group to dust models in order to constrain the dust size distribution and the structure of the molecular gas. These observations, together with a companion spectroscopy proposal, will provide the missing pieces of the overall energetic bugdet of the main coolants of the galaxy collision. The results will have important consequences on our understanding of the energetics and the role of d...ust in high-redshift mergers, and in the formation of the first stars and galaxies. |
| Publication | DustPedia: Multiwavelength photometry and imagery of 875 nearby galaxies in 42 ultraviolet-microwave bands . Clark C. J. R. et al. . Astronomy & Astrophysics, Volume 609, id.A37, 30 pp. . 609 . 10.1051\/0004-6361\/201731419 . 2018A&A...609A..37C , Shock-enhanced C+ Emission and the Detection of H2O from the Stephan.s Quintet Group-wide Shock Using Herschel . Appleton P. N. et al. . The Astrophysical Journal, Volume 777, Issue 1, article id. 66, 16 pp. (2013). . 777 . 10.1088\/0004-637X\/777\/1\/66 . 2013ApJ...777...66A , Infrared colours and spectral energy distributions of hard X-ray selected obscured and Compton-thick active galactic nuclei . Kilerci Eser Ece et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.494.5793K , A nearby galaxy perspective on dust evolution. Scaling relations and constraints on the dust build-up in galaxies with the DustPedia and DGS samples . Galliano Frédéric et al. . Astronomy and Astrophysics . null . null . 2021A&A...649A..18G , Reproducing the Universe: a comparison between the EAGLE simulations and the nearby DustPedia galaxy sample . Trčka Ana et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.494.2823T , Dust emissivity and absorption cross section in DustPedia late-type galaxies . Bianchi S. et al. . Astronomy and Astrophysics . null . null . 2019A&A...631A.102B , DustPedia: the relationships between stars, gas, and dust for galaxies residing in different environments . Davies J. I. et al. . Astronomy and Astrophysics . null . null . 2019A&A...626A..63D , Old and young stellar populations in DustPedia galaxies and their role in dust heating . ... |
| Instrument | SPIRE_SpirePhoto_small |
| Temporal Coverage | 2011-05-08T22:18:51Z/2011-05-08T22:28:34Z |
| Version | SPG v14.1.0 |
| Mission Description | Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2011-12-15T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, guillard, p., 2011, OT1_pguillar_1, SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-760h7vw |