332 citations · 946 across the 15 of their papers we have counts for
15 papers
The Ionization and Destruction of Polycyclic Aromatic Hydrocarbons in Powerful Quasars
Yanxia Xie, Luis C. Ho
We reanalyze the mid-infrared (5-40 m) Spitzer spectra of 86 low-redshift () Palomar-Green quasars to investigate the nature of polycyclic aromatic hydrocarbon (PAH) em…
The Infrared Emission and Vigorous Star Formation of Low-redshift Quasars
Yanxia Xie, Luis C. Ho, Ming-Yang Zhuang +1
The star formation activity of the host galaxies of active galactic nuclei (AGNs) provides valuable insights into the complex interconnections between black hole growth and galaxy…
A Method to Extract Spatially Resolved Polycyclic Aromatic Hydrocarbon Emission from Spitzer Spectra: Application to M51
Lulu Zhang, Luis C. Ho, Yanxia Xie
The mid-infrared spectrum contains rich diagnostics to probe the physical properties of galaxies, among which the pervasive emission features from polycyclic aromatic hydrocarbons…
A New Calibration of Star Formation Rate in Galaxies Based on Polycyclic Aromatic Hydrocarbon Emission
Yanxia Xie, Luis C. Ho
Polycyclic aromatic hydrocarbon (PAH) emission has long been proposed to be a potential star formation rate indicator, as it arises from the photodissociation region bordering the…
Interstellar Medium and Star Formation of Starburst Galaxies on the Merger Sequence
Jinyi Shangguan, Luis C. Ho, Ruancun Li +3
The interstellar medium is a key ingredient that governs star formation in galaxies. We present a detailed study of the infrared (~ 1-500 micron) spectral energy distributions of a…
The Widespread Presence of Nanometer-size Dust Grains in the Interstellar Medium of Galaxies
Yanxia Xie, Luis C. Ho, Aigen Li +1
Interstellar dust spans a wide range in size distribution, ranging from ultrasmall grains of a few Angstroms to micrometer-size grains. While the presence of nanometer-size dust gr…
A New Technique for Measuring Polycyclic Aromatic Hydrocarbon Emission in Different Environments
Yanxia Xie, Luis C. Ho, Aigen Li +1
We present a new method to decompose the emission features of polycyclic aromatic hydrocarbons (PAHs) from mid-infrared spectra using theoretical PAH templates in conjunction with…
On the Gas Content and Efficiency of AGN Feedback in Low-redshift Quasars
Jinyi Shangguan, Luis C. Ho, Yanxia Xie
The interstellar medium is crucial to understanding the physics of active galaxies and the coevolution between supermassive black holes and their host galaxies. However, direct gas…
The close environments of accreting massive black holes are shaped by radiative feedback
Claudio Ricci, Benny Trakhtenbrot, Michael J. Koss +13
The large majority of the accreting supermassive black holes in the Universe are obscured by large columns of gas and dust. The location and evolution of this obscuring material ha…
The mineralogy of newly formed dust in active galactic nuclei
Sundar Srinivasan, Franciska Kemper, Yeyan Zhou +8
The tori around active galactic nuclei (AGN) are potential formation sites for large amounts of dust, and they may help resolve the so-called dust budget crisis at high redshift. W…
Silicate Dust in Active Galactic Nuclei
Yanxia Xie, Aigen Li, Lei Hao
The unification theory of active galactic nuclei (AGNs) hypothesizes that all AGNs are surrounded by an anisotropic dust torus and are essentially the same objects but viewed from…
A Tale of Three Galaxies: A "Clumpy" View of the Spectroscopically Anomalous Galaxies IRAS F10398+1455, IRAS F21013-0739 and SDSS J0808+3948
Yanxia Xie, Robert Nikutta, Lei Hao +1
We investigate the dust properties in three spectroscopically anomalous galaxies (IRAS F10398+1455, IRAS F21013-0739 and SDSS J0808+3948). Their Spitzer/IRS spectra are characteriz…
A Tale of Three Galaxies: Deciphering the Infrared Emission of the Spectroscopically Anomalous Galaxies IRAS F10398+1455, IRAS F21013-0739 and SDSS J0808+3948
Yanxia Xie, Aigen Li, Lei Hao +1
The \textit{Spitzer}/Infrared Spectrograph spectra of three spectroscopically anomalous galaxies (IRAS~F10398+1455, IRAS~F21013-0739 and SDSS~J0808+3948) are modeled in terms of a…
A Tale of Three Galaxies: Anomalous Dust Properties in IRASF10398+1455, IRASF21013-0739 and SDSSJ0808+3948
Yanxia Xie, Lei Hao, Aigen Li
On a galactic scale the 9.7um silicate emission is usually only seen in type 1 active galactic nuclei (AGNs). They usually also display a flat emission continuum at ~5--8um and the…
The New Generation Atlas of Quasar Spectral Energy Distributions from Radio to X-rays
Zhaohui Shang, Michael Brotherton, Beverley J Wills +14
We have produced the next generation of quasar spectral energy distributions (SEDs), essentially updating the work of Elvis et al. (1994) by using high-quality data obtained with s…