English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the broadband X-ray spectra of the ultra-luminous infrared galaxy(ULIRG) UGC 5101 in the 0.25-100 keV band observed with Swift/Burst AlertTelescope (BAT), NuSTAR, Suzaku, XMM-Newton, and Chandra. A Compton-thick AGNobscured with a hydrogen column density of $\approx 1.3\times10^{24}$ cm$^{-2}$is detected above 10 keV. A spectral fit with a numerical torus model favors alarge half opening angle of the torus, $>41$ degrees, suggesting that thecovering fraction of material heavily obscuring the X-ray source is moderate.The intrinsic 2-10 keV luminosity is determined to be $\approx 1.4\times10^{43}$ erg s$^{-1}$, which is $\approx$2.5 times larger than the previousestimate using only data below 10 keV with a simple spectral model. We findthat UGC 5101 shows the ratio between the [O IV] 26 $\mu$m line and 2-10 keVluminosities similar to those of normal Seyfert galaxies, along with otherULIRGs observed with NuSTAR, indicating that a significant portion of localULIRGs are not really "X-ray faint" with respect to the flux of forbidden linesoriginating from the narrow line region (NLR). We propose a possible scenariothat (1) the AGN in UGC 5101 is surrounded not only by Compton-thick matterlocated close to the equatorial plane but also by Compton-thin ($N_\mathrm{H}\sim 10^{21}$ cm$^{-2}$) matter in the torus-hole region and (2) it isaccreting at a high Eddington rate with a steep UV to X-ray spectral energydistribution. Nevertheless, we argue that AGNs in many ULIRGs do not lookextraordinary (i.e., extremely X-ray faint), as suggested by recent works,compared with normal Seyferts.

Shedding Light on the Compton-thick Active Galactic Nucleus in the Ultra-luminous Infrared Galaxy UGC 5101 with Broadband X-ray Spectroscopy