Long way to go: how outflows from large galaxies propagate through the hot halo gas

Sarkar, Kartick Chandra; Nath, Biman B.; Sharma, Prateek; Shchekinov, Yuri

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6232

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DC Field	Value	Language
dc.contributor.author	Sarkar, Kartick Chandra	-
dc.contributor.author	Nath, Biman B.	-
dc.contributor.author	Sharma, Prateek	-
dc.contributor.author	Shchekinov, Yuri	-
dc.date.accessioned	2015-05-12T09:56:38Z	-
dc.date.available	2015-05-12T09:56:38Z	-
dc.date.issued	2015-03-21	-
dc.identifier.citation	Monthly Notices of the Royal Astronomical Society, 2015, Vol. 448, p328-343	en
dc.identifier.issn	0035-8711	-
dc.identifier.issn	1365-2966 - (online)	-
dc.identifier.uri	http://hdl.handle.net/2289/6232	-
dc.description	Open Access	en
dc.description.abstract	Using hydrodynamic simulations, we study the mass-loss due to supernova-driven outflows from Milky Way type disc galaxies, paying particular attention to the effect of the extended hot halo gas. We find that the total mass-loss at inner radii scales roughly linearly with total mass of stars formed, and that the mass loading factor at the virial radius can be several times its value at inner radii because of the swept up hot halo gas. The temperature distribution of the outflowing material in the inner region (∼10 kpc) is bimodal in nature, peaking at 105 K and 106.5 K, responsible for optical and X-ray emission, respectively. The contribution of cold/warm gas with temperature ≤105.5 K to the outflow rate within 10 kpc is ≈0.3–0.5. The warm mass loading factor, η3e5 (T ≤ 3 × 105 K) is related to the mass loading factor at the virial radius (ηv) as ηv ≈ 25 η3e5 (SFR/M⊙ yr−1)−0.15 for a baryon fraction of 0.1 and a starburst period of 50 Myr. We also discuss the effect of multiple bursts that are separated by both short and long periods. The outflow speed at the virial radius is close to the sound speed in the hot halo, ≲ 200 km s−1. We identify two ‘sequences’ of outflowing cold gas at small scales: a fast (≈500 km s−1) sequence, driven by the unshocked free-wind; and a slow sequence (≈± 100 km s−1) at the conical interface of the superwind and the hot halo.	en
dc.language.iso	en	en
dc.publisher	Oxford University Press for the Royal Astronomical Society	en
dc.relation.uri	http://adsabs.harvard.edu/abs/2015MNRAS.448..328S	en
dc.relation.uri	http://arxiv.org/abs/1409.4874	en
dc.relation.uri	http://dx.doi.org/10.1093/mnras/stu2760	en
dc.rights	2015 The authors & the Royal Astronomical Society	en
dc.title	Long way to go: how outflows from large galaxies propagate through the hot halo gas	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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