X-ray spectra of sources in the 13H XMM-Newton / Chandra deep field

Abstract

We present the X-ray spectra of 86 optically-identified sources in the 13H XMM-Newton/Chandra deep field which have >70 X-ray counts. The sample consists of 50 broad line AGN, 25 narrow emission line galaxies, 6 absorption line galaxies, and 5 Galactic stars. The majority (42/50) of the broad line AGN have X-ray spectra which are consistent with a power law shape. They have a mean photon index of Gamma = 2.0 +- 0.1 and an intrinsic dispersion sigma = 0.4 +- 0.1. Five BLAGN show a deficit of soft X-rays, indicating absorption. Significant absorption is more common in the narrow emission line galaxies (13/25) and absorption line galaxies (2/6) than in the broad line AGN (5/50), but is not universal in any of these classes of object. The majority of the 20 absorbed sources have X-ray spectra consistent with a simple cold photoelectric absorber, but 6/20 require more complex models with either an additional component of soft X-ray emitting plasma, or an ionised absorber. Of the 16 galaxies which do not show evidence for X-ray absorption, only 2 objects are likely to be powered by star formation, and both have 2-10 keV X-ray luminosities of <= 10^40 cgs. The X-ray emission in the other 14 unabsorbed NELGs and galaxies is most likely powered by AGN, which are not detected in the optical because they are outshone by their luminous host galaxies. The Galactic stars show multi-temperature thermal spectra which peak between 0.5 and 1 keV. Star/AGN discrimination is possible for 4 of the 5 stars solely from their X-ray spectra.

arXiv commentAccepted for publication in MNRAS

References in corpus (42)

• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• The Chandra Deep Field-North Survey. XIII. 2 Ms Point-Source Catalogs
• Luminosity-dependent evolution of soft X-ray selected AGN: New Chandra and XMM-Newton surveys
• The Chandra Deep Field South: the 1 Million Second
• The M(BH)-Sigma Relation for Supermassive Black Holes
• The Cosmic Evolution of Hard X-ray Selected Active Galactic Nuclei
• Dust in active nuclei. I. Evidence for "anomalous" properties
• XMM-Newton observation of the Lockman Hole; I. The X-ray Data
• Optical and Infrared Properties of the 2 Ms Chandra Deep Field-North X-ray Sources
• XMM-Newton Reflection Grating Spectrometer Observations of Discrete Soft-X-ray Emission Features from NGC 1068
• ASCA observations of Seyfert 1 galaxies: I. Data Analysis, Imaging and Timing
• The intragroup medium in loose groups of galaxies
• XMM-Newton observation of the Lockman Hole II. Spectral analysis
• X-Rays from NGC 3256: High-Energy Emission in Starburst Galaxies and Their Contribution to the Cosmic X-Ray Background
• An XMM-Newton hard X-ray survey of ULIRGs
• The Chandra High Energy Transmission Grating Observation of an X-ray Ionization Cone in Markarian 3
• Obscured AGN and the X-ray, Optical and Far-Infrared Number Counts of AGN in the GOODS Fields
• XMM-Newton discovery of a sharp spectral feature at ~7 keV in the Narrow-Line Seyfert 1 galaxy 1H 0707-495
• XMM-Newton observations expose AGN in apparently normal galaxies
• XMM-Newton observations of the Lockman Hole V: time variability of the brightest AGN
• XMM-Newton observations of the Lockman Hole IV: spectra of the brightest AGN
• Hard X-ray emitting Active Galactic Nuclei selected by the Chandra Multi-wavelength Project
• The Origin of the Cosmic Soft X-Ray Background: Optical Identification of an Extremely Deep ROSAT Survey
• The XMM-Newton HBS28 sample: studying the obscuration in hard X-ray selected AGNs
• The X-ray spectra of optically selected Seyfert 2 galaxies. Are there any Sy2 galaxies with no absorption?
• Radio Observations of the 13hr XMM/ROSAT Deep X-ray Survey Area
• Long-term spectral changes in the partial-covering candidate NLS1 1H 0707-495
• The XMM-Newton Serendipitous Survey. II. First results from the AXIS high galactic latitude medium sensitivity survey
• The Chandra Deep Field South/GOODS survey. Optically faint X-ray sources
• The origin of the Fe K features in Markarian 205 and Markarian 509
• X-ray spectra of XMM-Newton serendipitous medium flux sources
• The Galaxy Luminosity Function from M_R = -25 to M_R = -9
• H1320+551: A Seyfert 1.8/1.9 galaxy with an unabsorbed X-ray spectrum
• A survey of hard spectrum ROSAT sources 2: optical identification of hard sources
• XMM-Newton 13H Deep field - I. X-ray sources
• Multi-wavelength observations of serendipitous Chandra X-ray sources in the field of A2390
• X-ray Spectra of the RIXOS source sample
• A medium deep Chandra and Subaru survey of the 13hr XMM/ROSAT deep survey area
• Constraints on the distribution of absorption in the X-ray selected AGN population found in the 13H XMM-Newton/Chandra deep field
• The fraction of galaxies that contain active nuclei and their accretion rates
• Starburst activity in a ROSAT Narrow Emission-Line Galaxy
• Optical and X-ray characteristics of a newly discovered narrow-line QSO : RX J1334.2+3759

Cited by in corpus (29)

• AGN Dusty Tori: II. Observational Implications of Clumpiness
• Identifying Luminous AGN in Deep Surveys: Revised IRAC Selection Criteria
• A Radio-Selected Black Hole X-ray Binary Candidate in the Milky Way Globular Cluster M62
• The Toroidal Obscuration of Active Galactic Nuclei
• The XMM-Newton wide-field survey in the COSMOS field. IV: X-ray spectral properties of Active Galactic Nuclei
• HELP: The Herschel Extragalactic Legacy Project
• The X-ray spectral properties of the AGN population in the XMM-Newton bright serendipitous survey
• The INTEGRAL/IBIS AGN catalogue I: X-ray absorption properties versus optical classification
• Elusive AGN in the XMM-Newton bright serendipitous survey
• SPIDERS: Selection of spectroscopic targets using AGN candidates detected in all-sky X-ray surveys
• New constraints on the X-ray spectral properties of type 1 AGN
• X-ray absorption, nuclear infrared emission and dust covering factors of AGN: testing Unification Schemes
• The XMM-Newton Wide Angle Survey (XWAS): the X-ray spectrum of type-1 AGN
• The distribution of absorption in AGN detected in the XMM-Newton observations of the CDFS
• The XMM large scale structure survey: optical vs. X-ray classifications of active galactic nuclei and the unified scheme
• Obscured and unobscured AGN populations in a hard-X-ray selected sample of the XMDS survey
• X-rays from the redshift 7.1 quasar ULAS J1120+0641
• Constraints on light bending and reflection from the hard X-ray background
• The Ultraluminous X-ray Sources near the Center of M82
• BAT AGN Spectroscopic Survey--VIII. Type 1 AGN With Massive Absorbing Columns
• The nature of X-ray absorbed QSOs
• A new sample of X-ray selected narrow emission-line galaxies. II. Looking for True Seyfert 2
• The X-ray luminous galaxies optically classified as star forming are mostly narrow line Seyfert 1s
• AGN and star formation across cosmic time
• Properties of X-ray selected Broad Absorption Line Quasars
• The XMM-Newton Wide Angle Survey (XWAS)
• The composite nature of Dust-Obscured Galaxies (DOGs) at z~2-3 in the COSMOS field: II. The AGN fraction
• The XMM spectral catalog of SDSS optically selected Seyfert 2 galaxies
• The XMM-SSC survey of hard-spectrum XMM-Newton sources 1: optically bright sources