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Title:
Chandra observation of the edge-on spiral NGC 5775: probing the hot galactic disc/halo connection
Authors:
Li, Jiang-Tao; Li, Zhiyuan; Wang, Q. Daniel; Irwin, Judith A.; Rossa, Joern
Affiliation:
AA(Department of Astronomy, Nanjing University, 22 Hankou Road, Nanjing 210093, P. R. China; Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003, USA), AB(Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003, USA), AC(Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003, USA), AD(Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, ON K7L 3N6, Canada), AE(Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 390, Issue 1, pp. 59-70. (MNRAS Homepage)
Publication Date:
10/2008
Origin:
MNRAS
MNRAS Keywords:
galaxies: general , galaxies: individual: NGC 5775 , galaxies: spiral , X-rays: general
DOI:
10.1111/j.1365-2966.2008.13749.x
Bibliographic Code:
2008MNRAS.390...59L

Abstract

We study the edge-on galaxy NGC 5775, utilizing a 58.2 ks Chandra ACIS-S observation together with complementary Hubble Space Telescope (HST) ACS, Spitzer IRAC and other multi-wavelength data sets. This edge-on galaxy, with its disc-wide active star formation, is particularly well suited for studying the disc/halo interaction on subgalactic scales. We detect 27 discrete X-ray sources within the D25 region of the galaxy, including an ultra-luminous source with a 0.3-7 keV luminosity of ~7 × 1040ergs-1. The source-removed diffuse X-ray emission shows several prominent extraplanar features, including a ~10kpc diameter `shell-like' feature and a `blob' reaching a projected distance of ~25kpc from the galactic disc. The bulk of the X-ray emission in the halo has a scale height of ~1.5 kpc and can be characterized by a two-temperature optically thin thermal plasma with temperatures of ~0.2 and 0.6keV and a total 0.3-2 keV luminosity of ~3.5 × 1039ergs-1. The high-resolution, multi-wavelength data reveal the presence of several extraplanar features around the disc, which appear to be associated with the in-disc star formation. We suggest that hot gas produced with different levels of mass loading can have different temperatures, which may explain the characteristic temperatures of hot gas in the halo. We have obtained a subgalactic scale X-ray-intensity-star-formation relation, which is consistent with the integrated version in other star-forming galaxies.

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