A dataset provided by the European Space Agency

Name OT2_pguillar_5
Title A high-resolution look at dust emission from shocks and star-forming regions in Stephan.s Quintet


DOI 10.5270/esa-vcsweu5
Author guillard, p.
Description Stephan.s Quintet (SQ) is a compact group of galaxies, where tidal interactions have brought large amounts of gas into the intergalactic medium (IGM). Spitzer IRS observations revealed an unusually bright H2 line emission from a giant (40 kpc long), X-ray emitting shock attributed to a high-speed (1000 km-s) galaxy collision. The extreme H2-to-PAH flux ratio (1000 times more than star-forming galaxies) suggest that H2 is predominantly excited by shocks rather than UV heating from star-forming regions. From our OT1 P2 project, we recently obtained SPIRE images of SQ, revealing for the first time the cold dust associated with the warm H2 gas in the shock. However, the large SPIRE beams do not separate star-forming regions from shocked gas. To confirm what fraction of the dust emission comes from the shock, we propose PACS observations with higher angular resolution. These observations are further motivated by our recent PdBI CO(1-0) observations, which break the SQ shock in large complexes (3-5 kpc in size) with a range of line widths (40-200km-s). Some of them could be sites of star formation. PACS is the only instrument providing the sensitivity and angular resolution to quantify star formation on these scales. With the proposed observations, for the first time for IGM gas, we will be able to (1) calibrate the CO to H2 conversion factor using dust emission and estimate the total cold gas content of the CO complexes, (2) study the impact of turbulence on star-formation efficiency, and (3) constrain the dust size distribution. The results will have important consequences on our understanding of the energetics and the role of dust in cooling the IGM gas in high-redshift mergers, and in the formation of 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 ,
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 . Nersesian A. et al. . Astronomy and Astrophysics . null . null . 2019A&A...624A..80N ,
BAT AGN Spectroscopic Survey. XI. The Covering Factor of Dust and Gas in Swift-BAT Active Galactic Nuclei . Ichikawa Kohei et al. . The Astrophysical Journal, Volume 870, Issue 1, article id. 31, 16 pp. (2019). . 870 . 10.3847\/1538-4357\/aaef8f . 2019ApJ...870...31I ,
Fraction of bolometric luminosity absorbed by dust in DustPedia galaxies . Bianchi S. et al. . Astronomy & Astrophysics, Volume 620, id.A112, 21 pp. . 620 . 10.1051\/0004-6361\/201833699 . 2018A&A...620A.112B ,
Herschel observati...
Instrument PACS_PacsPhoto_largeScan
Temporal Coverage 2012-05-12T22:54:02Z/2012-05-13T11:55:05Z
Version SPG v14.2.0
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 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2012-11-13T05:25:05Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2012-11-13T05:25:05Z, OT2_pguillar_5, SPG v14.2.0. https://doi.org/10.5270/esa-vcsweu5