The Chandra Deep Field North Survey. VIII. X-ray Constraints on Spiral Galaxies from 0.4 < z < 1.5

TL;DR

This study uses deep Chandra X-ray data to analyze spiral galaxies at redshifts 0.4 to 1.5, revealing their X-ray to B-band luminosity ratios are similar to local galaxies but possibly higher, and predicting detectability thresholds.

Contribution

It provides the first statistical X-ray constraints on spiral galaxies at intermediate redshifts using deep field data, highlighting potential evolution in their X-ray properties.

Findings

X-ray to B-band luminosity ratios are similar to local galaxies but may increase by 2-3 times.

Typical spiral galaxies at 0.4 < z < 1.5 are detectable in the 0.5-2 keV band at specified flux levels.

Predicted flux range for detection is 3-6 x 10^-18 erg cm^-2 s^-1.

Abstract

We present a statistical X-ray study of spiral galaxies in the Hubble Deep Field-North and its Flanking Fields using the Chandra Deep Field North 1 Ms dataset. We find that approximately L_star galaxies with 0.4 < z < 1.5 have ratios of X-ray to B-band luminosity similar to those in the local Universe, although the data indicate a likely increase in this ratio by a factor of approximately 2-3. We have also determined that typical spiral galaxies at 0.4 < z < 1.5 should be detected in the 0.5--2 keV band in the flux range 3-6 X 10^-18 erg cm^-2 s^-1.