Surveys of the Cosmic X-ray Background

Brandt, W. N.; Yang, Guang

doi:10.48550/arxiv.2111.01156

Cited by 7 publications

(8 citation statements)

References 154 publications

(121 reference statements)

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“…Second, there are inevitable connections between AGN X-ray and 6 μm luminosities resulting from the SED fitting. Nevertheless, the effect upon Figure 22, compared to other luminosity-luminosity relations, has been minimized because the MIR-X-ray relation is only secondary (Yang et al 2020;Brandt & Yang 2021) and L X, obs , instead of L X (which is directly utilized in the SED fitting), is used.…”

Section: Mir-x-ray Relations For Agnsmentioning

confidence: 99%

“…SED fitting can provide direct information for LSST sources and thus can serve as a basis for a variety of works in the future. For instance, AGNs are important because supermassive black holes (SMBHs) coevolve with their host galaxies over cosmic time (e.g., Kormendy & Ho 2013;Brandt & Yang 2021; and references therein). In fact, AGN studies will be a pillar of the science that will be performed in the LSST DDFs (e.g., Brandt et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…W-CDF-S is chosen as the representative example because it has the most complete previous literature for comparison. For example, CDF-S, which is embedded in W-CDF-S, has the deepest X-ray observations ever obtained (Luo et al 2017;Xue 2017;Brandt & Yang 2021) and thus can provide a largely complete pure AGN sample for calibration of AGN selection.…”

Section: Introductionmentioning

confidence: 99%

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Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties

Zou

Brandt

Chen

et al. 2022

ApJS

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W-CDF-S, ELAIS-S1, and XMM-LSS will be three Deep-Drilling Fields (DDFs) of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), but their extensive multiwavelength data have not been fully utilized as done in the COSMOS field, another LSST DDF. To prepare for future science, we fit source spectral energy distributions (SEDs) from X-ray to far-infrared in these three fields mainly to derive galaxy stellar masses and star formation rates. We use CIGALE v2022.0, a code that has been regularly developed and evaluated, for the SED fitting. Our catalog includes 0.8 million sources covering 4.9 deg2 in W-CDF-S, 0.8 million sources covering 3.4 deg2 in ELAIS-S1, and 1.2 million sources covering 4.9 deg2 in XMM-LSS. Besides fitting normal galaxies, we also select candidates that may host active galactic nuclei (AGNs) or are experiencing recent star formation variations and use models specifically designed for these sources to fit their SEDs; this increases the utility of our catalog for various projects in the future. We calibrate our measurements by comparison with those in well-studied smaller regions and briefly discuss the implications of our results. We also perform detailed tests of the completeness and purity of SED-selected AGNs. Our data can be retrieved from a public website.

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Section: Mir-x-ray Relations For Agnsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties

Zou

Brandt

Chen

et al. 2022

ApJS

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“…7 The X-ray sky has since been explored by several more recent instruments, as reviewed e.g. in [72].…”

Section: A Existing Instrumentsmentioning

confidence: 99%

Limits on primordial black holes detectability with Isatis: A BlackHawk tool

Auffinger

2022

Preprint

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Primordial black holes (PBHs) are convenient candidates to explain the elusive dark matter (DM). However, years of constraints from various astronomical observations have constrained their abundance over a wide range of masses, leaving only a narrow window open at 10 17 g M 10 22 g for all DM in the form of PBHs. We reexamine this disputed window with a critical eye, interrogating the general hypotheses underlying the direct photon constraints. We review 4 levels of assumptions: i) instrument characteristics, ii) prediction of the (extra)galactic photon flux, iii) statistical method of signal-to-data comparison and iv) computation of the Hawking radiation rate. Thanks to Isatis, a new tool designed for the public Hawking radiation code BlackHawk, we first revisit the existing and prospective constraints on the PBH abundance and investigate the impact of assumptions i)-iv). We show that the constraints can vary by several orders of magnitude, advocating the necessity of a reduction of the theoretical sources of uncertainties. Second, we consider an "ideal" instrument and we demonstrate that the PBH DM scenario can only be constrained by the direct photon Hawking radiation phenomenon below Mmax ∼ 10 20 g. The upper part of the mass window should therefore be closed by other means.

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“…𝑁 > 100) surveyed with multiwavelength observations. Extragalactic hard (>2 keV) X-ray surveys provide one of the most complete ways to study growing black holes in an unbiased way (see, e.g., Brandt & Alexander 2015;Brandt & Yang 2021). A large fraction, and indeed the majority, of the AGN population is obscured and therefore the construction of a complete AGN census requires the identification of both obscured and unobscured sources (see review by, e.g., Hickox & Alexander 2018).…”

Section: Introductionmentioning

confidence: 99%

BAT AGN Spectroscopic Survey XXI: The Data Release 2 Overview

Koss,

Trakhtenbrot,

Ricci

et al. 2022

Preprint

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The BAT AGN Spectroscopic Survey (BASS) is designed to provide a highly complete census of the key physical parameters of the supermassive black holes (SMBHs) that power local active galactic nuclei (AGN) (𝑧 0.3), including their bolometric luminosity (𝐿 bol ), black hole mass (𝑀 BH ), accretion rates (𝐿 bol /𝐿 Edd ), line-of-sight gas obscuration (𝑁 H ), and the distinctive properties of their host galaxies (e.g., star formation rates, masses, and gas fractions). We present an overview of the BASS data release 2 (DR2), an unprecedented spectroscopic AGN survey in spectral range, resolution, and sensitivity, including 1449 optical (∼3200 Å-1 𝜇m) and 233 NIR (1-2.5 𝜇m) spectra for the brightest 858 ultra-hard X-ray (14-195 keV) selected AGN across the entire sky and essentially all levels of obscuration. This release provides a highly complete set of key measurements (emission line measurements and central velocity dispersions), with 99.9% measured redshifts and 98% black hole masses estimated (for unbeamed AGN outside the Galactic plane). The BASS DR2 AGN sample represents a unique census of nearby powerful AGN, spanning over 5 orders of magnitude in AGN bolometric luminosity (𝐿 bol ∼ 10 40 − 10 47 erg s −1 ), black hole mass (𝑀 BH ∼ 10 5 − 10 10 𝑀 ), Eddington ratio (𝐿 bol /𝐿 Edd 10 −5 ), and obscuration (𝑁 H ∼ 10 20 − 10 25 cm −2 ). The public BASS DR2 sample and measurements can thus be used to answer fundamental questions about SMBH growth and its links to host galaxy evolution and feedback in the local universe, as well as open questions concerning SMBH physics. Here we provide a brief overview of the survey strategy, the key BASS DR2 measurements, data sets and catalogs, and scientific highlights from a series of DR2-based works pursued by the BASS team.

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Surveys of the Cosmic X-ray Background

Cited by 7 publications

References 154 publications

Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties

Spectral Energy Distributions in Three Deep-drilling Fields of the Vera C. Rubin Observatory Legacy Survey of Space and Time: Source Classification and Galaxy Properties

Limits on primordial black holes detectability with Isatis: A BlackHawk tool

BAT AGN Spectroscopic Survey XXI: The Data Release 2 Overview

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