X-RAY EMISSION in NON-AGN GALAXIES at z ≃ 1

Suchetana Chatterjee, Jeffrey A. Newman, Tesla Jeltema, Adam D. Myers, James Aird, Kevin Bundy, Christopher Conselice, Michael Cooper, Elise Laird, Kirpal Nandra, Christopher Willmer

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Using data from the DEEP2 galaxy redshift survey and the All Wavelength Extended Groth Strip International Survey we obtain stacked X-ray maps of galaxies at 0.7 ≤ z ≤ 1.0 as a function of stellar mass. We compute the total X-ray counts of these galaxies and show that in the soft band (0.52 kev) there exists a significant correlation between galaxy X-ray counts and stellar mass at these redshifts. The best-fit relation between X-ray counts and stellar mass can be characterized by a power law with a slope of 0.58 ±0.1. We do not find any correlation between stellar mass and X-ray luminosities in the hard (27 kev) and ultra-hard (47 kev) bands. The derived hardness ratios of our galaxies suggest that the X-ray emission is degenerate between two spectral models, namely point-like power-law emission and extended plasma emission in the interstellar medium. This is similar to what has been observed in low redshift galaxies. Using a simple spectral model where half of the emission comes from power-law sources and the other half from the extended hot halo we derive the X-ray luminosities of our galaxies. The soft X-ray luminosities of our galaxies lie in the range 10398 ×1040 erg s-1 Dividing our galaxy sample by the criteria U-B> 1, we find no evidence that our results for X-ray scaling relations depend on optical color.

Original languageEnglish (US)
Article number136
JournalAstrophysical Journal
Volume806
Issue number1
DOIs
StatePublished - Jun 10 2015
Externally publishedYes

Keywords

  • X-rays: galaxies
  • galaxies: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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