Chandra Survey of Nearby Galaxies: The Catalog

She, Rui; Ho, Luis C.; Feng, Hua

doi:10.3847/1538-4357/835/2/223

Cited by 63 publications

(91 citation statements)

References 82 publications

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“…Chandra observations by She (2017a) and She (2017b) suggest that the incidence of AGNs in nearby galaxies ranges from 60% in elliptical galaxies to 20% in Sc and later types, and they find 314 AGN candidates that had previously only been designated as HII region-type nuclear spectra. Although we have many fewer galaxies, our detection rate is roughly consistent with She (2017b) (see their Table 1) in which they find about 50% in S0 to 39% in Sc and later types for nearby galaxies.…”

Section: The Incidence Of Agns In the Chang-es Samplementioning

confidence: 99%

CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

Irwin

Wiegert

Merritt

et al. 2019

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The CHANG-ES galaxy sample consists of 35 nearby edge-on galaxies that have been observed using the VLA at 1.6 GHz and 6.0 GHz. Here we present the 3rd data release of our sample, namely the B-configuration 1.6 GHz sample. In addition, we make available the band-to-band spectral index maps between 1.6 GHz and 6.0 GHz, the latter taken in the matching resolution C-configuration. The images can be downloaded from https://www.queensu.ca/changes. These are our highest resolution images (≈ 3 arcsec) and we examine the possible presence of low luminosity active galactic nuclei in the sample as well as some in-disk structure. New features can be seen in the spectral index maps that are masked in the total intensity emission, including hidden spiral arms in NGC 3448 and two previously unknown radio lobes on either side of the nucleus of NGC 3628. Our AGN detection rate, using only radio criteria, is 55% which we take as a lower limit because some weaker embedded AGNs are likely present which could be revealed at higher resolution. Archival XMM-Newton data were used to search for further fingerprints of the AGNs in the studied sample. In galaxy disks, discrete regions of flat spectral index are seen, likely due to a thermal emission fraction that is higher than the global average.

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Section: The Incidence Of Agns In the Chang-es Samplementioning

confidence: 99%

CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

Irwin

Wiegert

Merritt

et al. 2019

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“…Unless otherwise stated, uncertainties are quoted at the 90% confidence level. 24 See also She et al (2017aShe et al ( , 2017b for a soft X-ray study of lower-luminosity local AGNs.…”

Section: Introductionmentioning

confidence: 99%

BAT AGN Spectroscopic Survey. V. X-Ray Properties of the Swift /BAT 70-month AGN Catalog

Ricci

Trakhtenbrot

Koss

et al. 2017

ApJS

Self Cite

489

719

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Hard X-ray (10 keV) observations of active galactic nuclei (AGNs) can shed light on some of the most obscured episodes of accretion onto supermassive black holes. The 70-month Swift/BAT all-sky survey, which probes the 14-195 keV energy range, has currently detected 838 AGNs. We report here on the broadband X-ray (0.3-150 keV) characteristics of these AGNs, obtained by combining XMM-Newton, Swift/XRT, ASCA, Chandra, and Suzaku observations in the soft X-ray band ( 10  keV) with 70-month averaged Swift/BAT data. The nonblazar AGNs of our sample are almost equally divided into unobscured (N 10 cm H 22 2 < -) and obscured (N 10 cm H 22 2  -) AGNs, and their Swift/BAT continuum is systematically steeper than the 0.3-10 keV emission, which suggests that the presence of a high-energy cutoff is almost ubiquitous. We discuss the main X-ray spectral parameters obtained, such as the photon index, the reflection parameter, the energy of the cutoff, neutral and ionized absorbers, and the soft excess for both obscured and unobscured AGNs.

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“…2. First, in the low luminosity regime (log L X 42 erg s −1 ), we adopt L X from a sample of nearby (< 50 Mpc) LLAGN from She et al (2017) and cross-match the sources with the FIRST 1.4 GHz catalog (Helfand et al 2015) to obtain the radio luminosity. Second, in the high luminosity regime (log L X 42 erg s −1 ), we plot the X-ray-selected AGN from the Stripe 82 X-ray Survey (LaMassa et al 2016).…”

Section: General Agn Propertiesmentioning

confidence: 99%

“…Similar to Fig. 2, we also plot the following comparison samples: (1) the AGN from the original Merloni et al (2003) sample, (2) LLAGN with Chandra/ACIS X-ray luminosity and BH mass from the M BH −σ relation (She et al 2017) and 1.4 GHz radio flux from the FIRST survey (Helfand et al 2015), and (3) PG QSOs with 5 GHz radio flux from Kellermann et al (1989), XMM-Newton X-ray luminosity from Piconcelli et al (2005), and Hβ-based virial BH mass from Lani et al (2017). It is clear from Fig.…”

Section: General Agn Propertiesmentioning

confidence: 99%

“…To construct the control sample, we select 68 AGN with Xray luminosities between 39.8 < log L X /erg s −1 < 42.0 from the catalog of 314 nearby LLAGN observed by Chandra (She et al 2017). The luminosity range matches that of the dAGN, so it prevents potential biases of the HRs due to any possible correlation between N H and L X .…”

Section: Distribution Of X-ray Hardness Ratiosmentioning

confidence: 99%

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X-Ray Properties of Radio-selected Dual Active Galactic Nuclei

Groß

Myers

et al. 2019

ApJ

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Merger simulations predict that tidally induced gas inflows can trigger kpc-scale dual active galactic nuclei (dAGN) in heavily obscured environments. Previously with the Very Large Array, we have confirmed four dAGN with redshifts between 0.04 < z < 0.22 and projected separations between 4.3 and 9.2 kpc in the SDSS Stripe 82 field. Here, we present Chandra X-ray observations that spatially resolve these dAGN and compare their multi-wavelength properties to those of single AGN from the literature. We detect X-ray emission from six of the individual merger components and obtain upper limits for the remaining two. Combined with previous radio and optical observations, we find that our dAGN have properties similar to nearby low-luminosity AGN, and they agree well with the black hole fundamental plane relation. There are three AGN-dominated X-ray sources, whose X-ray hardness-ratio derived column densities show that two are unobscured and one is obscured. The low obscured fraction suggests these dAGN are no more obscured than single AGN, in contrast to the predictions from simulations. These three sources show an apparent X-ray deficit compared to their midinfrared continuum and optical [O III] line luminosities, suggesting higher levels of obscuration, in tension with the hardness-ratio derived column densities. Enhanced mid-infrared and [O III] luminosities from star formation may explain this deficit. There is ambiguity in the level of obscuration for the remaining five components since their hardness ratios may be affected by non-nuclear X-ray emissions, or are undetected altogether. They require further observations to be fully characterized.

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Chandra Survey of Nearby Galaxies: The Catalog

Cited by 63 publications

References 82 publications

CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

CHANG-ES. XX. High-resolution Radio Continuum Images of Edge-on Galaxies and Their AGNs: Data Release 3

BAT AGN Spectroscopic Survey. V. X-Ray Properties of the Swift /BAT 70-month AGN Catalog

X-Ray Properties of Radio-selected Dual Active Galactic Nuclei

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