X-ray properties of Lyman Break Galaxies in the Hubble Deep Field North region

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dc.creatorNandra, K.
dc.creatorMushotzky, R. F.
dc.creatorArnaud, K. A.
dc.creatorSteidel, C. C.
dc.creatorAdelberger, K. A.
dc.creatorGardner, J. P.
dc.creatorTeplitz, H. I.
dc.creatorWindhorst, R. A.
dc.date2002-05-15
dc.date.accessioned2026-07-07T10:31:15Z
dc.date.available2026-07-07T10:31:15Z
dc.descriptionWe describe the X-ray properties of a large sample of $z\sim3$ Lyman Break Galaxies (LBGs) in the region of the Hubble Deep Field North, derived from the 1 Ms public Chandra observation. Of our sample of 148 LBGs, four are detected individually. This immediately gives a measure of the bright AGN fraction in these galaxies of $\sim 3$~per cent, which is in agreement with that derived from the UV spectra. The X-ray color of the detected sources indicates that they are probably moderately obscured. Stacking of the remainder shows a significant detection ($6σ$) with an average luminosity of $3.5 \times 10^{41}$~erg s$^{-1}$ per galaxy in the rest frame 2-10 keV band. We have also studied a comparison sample of 95 z$\sim 1$ ``Balmer Break'' galaxies. Eight of these are detected directly, with at least two clear AGN based on their high X-ray luminosity and very hard X-ray spectra respectively. The remainder are of relatively low luminosity ($<10^{42}$~erg s$^{-1}$), and the X-rays could arise from either AGN or rapid star-formation. The X-ray colors and evidence from other wavebands favor the latter interpretation. Excluding the clear AGN, we deduce a mean X-ray luminosity of $6.6 \times 10^{40}$~erg s$^{-1}$, a factor $\sim 5$ lower than the LBGs. The average ratio of the UV and X-ray luminosities of these starforming galaxies $L_{\rm UV}/L_{\rm X}$, however, is approximately the same at $z = 1$ as it is at $z = 3$. This scaling implies that the X-ray emission follows the current star formation rate, as measured by the UV luminosity. We use our results to constrain the star formation rate at $z\sim 3$ from an X-ray perspective (truncated).
dc.description33 pages, 5 figures, Accepted for Publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0205215
dc.identifierhttp://arxiv.org/abs/astro-ph/0205215
dc.identifierAstrophys.J.576:625-639,2002
dc.identifierdoi:10.1086/341888
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178348
dc.subjectAstrophysics
dc.titleX-ray properties of Lyman Break Galaxies in the Hubble Deep Field North region
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