Investigating early-type galaxy evolution with a multiwavelength approach - I. X-ray properties of 12 galaxies observed with Swift and XMM-Newton
Date Issued
2015
Author(s)
•
•
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Marino, Antonietta
•
Description
We thank an anonymous referee for a very careful reading of the manuscript. Based on observations obtained with XMM–Newton , an ESA science mission with instruments and contributions directly funded by ESA. We acknowledge partial financial support from contract ASI-INAF I/009/10/0; INAF PRIN 2011: Galaxy Evolution with the VLT Survey Telescope (VST). ASI-INAF I/016/07/0. This research has made use of the NASA/ IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Abstract
We report here the results from the X-ray observations of 12 early-type galaxies (ETGs) observed with Swift and XMM-Newton, originally selected from a sample of galaxies with Spitzer and/or GALEX data. With the combined analysis of new X-ray and optical-UV observations and of previously available data from archives, we aim at investigating the relation between X-ray luminosity and evolutionary phases of ETGs. We will interpret the results with the additional aid of smoothed particle hydrodynamics chemo-photometric simulations. All galaxies have been detected in the X-ray band, with luminosities Lx > 1039 erg s-1. X-ray emitting gas has been detected in about half of the sample, with luminosities from ≥1039 to 1040 erg s-1. UVOT images show a variety of morphologies, from absence of peculiar features relative to optical wavelengths typical of red and dead early-types, to well defined almost circular rings clearly emerging in the U band, to more spectacular and complex features connected to recent or even ongoing star formation (SF). We find little evidence of any influence of the SF activity on their global X-ray properties, and in particular, on the luminosity-weighted age of the system, usually estimated in the nuclear region. However, with the present data we cannot exclude that such a relation exists on smaller scales, related to the specific sites where we see evidence of newly formed stars, such as outer rings and arcs and peculiar features observed in UV images.
Volume
449
Issue
3
Start page
3021
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.449.3021T
Rights
open.access
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