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

doi:10.1088/0004-637X/806/1/136

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

Steward Observatory

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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 language	English (US)
Article number	136
Journal	Astrophysical Journal
Volume	806
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/806/1/136
State	Published - Jun 10 2015

Keywords

X-rays: galaxies
galaxies: ISM

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/806/1/136

Cite this

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title = "X-RAY EMISSION in NON-AGN GALAXIES at z ≃ 1",

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.",

keywords = "X-rays: galaxies, galaxies: ISM",

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

note = "Publisher Copyright: {\textcopyright} 2015. The American Astronomical Society. All rights.",

year = "2015",

month = jun,

day = "10",

doi = "10.1088/0004-637X/806/1/136",

language = "English (US)",

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T1 - X-RAY EMISSION in NON-AGN GALAXIES at z ≃ 1

AU - Chatterjee, Suchetana

AU - Newman, Jeffrey A.

AU - Jeltema, Tesla

AU - Myers, Adam D.

AU - Aird, James

AU - Bundy, Kevin

AU - Conselice, Christopher

AU - Cooper, Michael

AU - Laird, Elise

AU - Nandra, Kirpal

AU - Willmer, Christopher

PY - 2015/6/10

Y1 - 2015/6/10

N2 - 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.

AB - 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.

KW - X-rays: galaxies

KW - galaxies: ISM

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

Abstract

Keywords

ASJC Scopus subject areas

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