Search Publications
AGN Activity and the Misaligned Hot ISM in the Compact Radio Elliptical NGC 4278
Trinchieri, Ginevra; Zezas, Andreas; Gallagher, John S. +5 more
The analysis of a deep (579 ks) Chandra ACIS pointing of the elliptical galaxy NGC 4278, which hosts a low-luminosity active galactic nucleus (AGN) and compact radio emission, allowed us to detect extended emission from hot gas out to a radius of ~5 kpc, with 0.5-8 keV luminosity of 2.4 × 1039 erg s-1. The emission is elongat…
Measuring Sizes of Ultra-faint Dwarf Galaxies
Geha, Marla; Padmanabhan, Nikhil; Muñoz, Ricardo R.
The discovery of ultra-faint dwarf (UFD) galaxies in the halo of the Milky Way extends the faint end of the galaxy luminosity function to a few hundred solar luminosities. This extremely low luminosity regime poses a significant challenge for the photometric characterization of these systems. We present a suite of simulations aimed at understandin…
The Quiescent X-Ray Properties of the Accreting Millisecond X-Ray Pulsar and Eclipsing binary Swift J1749.4-2807
Degenaar, N.; Wijnands, R.; Patruno, A.
Swift J1749.4-2807 is a transient neutron star low-mass X-ray binary that contains an accreting millisecond X-ray pulsar spinning at 518 Hz. It is the first of its kind that displays X-ray eclipses, which holds significant promise to precisely constrain the mass of the neutron star. We report on a ~= 105 ks long XMM-Newton observation performed wh…
A Flux-limited Sample of z ~ 1 Lyα Emitting Galaxies in the Chandra Deep Field South
Barger, A. J.; Cowie, L. L.; Wold, I. G. B.
We describe a method for obtaining a flux-limited sample of Lyα emitters from Galaxy Evolution Explorer (GALEX) grism data. We show that the multiple GALEX grism images can be converted into a three-dimensional (two spatial axes and one wavelength axis) data cube. The wavelength slices may then be treated as narrowband images and searched for emis…
Exploring the Relation between (Sub-)Millimeter Radiation and γ-Ray Emission in Blazars with Planck and Fermi
Lähteenmäki, A.; Polenta, G.; Gasparrini, D. +5 more
The coexistence of Planck and Fermi satellites in orbit has enabled the exploration of the connection between the (sub-)millimeter and γ-ray emission in a large sample of blazars. We find that the γ-ray emission and the (sub-)mm luminosities are correlated over five orders of magnitude, L γvpropL (sub-)mm. However, this corre…
Comoving Space Density and Obscured Fraction of High-redshift Active Galactic Nuclei in the Subaru/XMM-Newton Deep Survey
Ueda, Yoshihiro; Akiyama, Masayuki; Hiroi, Kazuo +1 more
We study the comoving space density of X-ray-selected luminous active galactic nuclei (AGNs) and the obscured AGN fraction at high redshifts (3 < z < 5) in the Subaru/XMM-Newton Deep Survey field. From an X-ray source catalog with high completeness of optical identification thanks to deep optical images, we select a sample of 30 AGNs at z &g…
A Physical Model for SN 2001ay, a Normal, Bright, Extremely Slow Declining Type Ia Supernova
Wang, L.; Baron, E.; Dominguez, I. +5 more
We present a study of the peculiar Type Ia supernova 2001ay (SN 2001ay). The defining features of its peculiarity are high velocity, broad lines, and a fast rising light curve, combined with the slowest known rate of decline. It is one magnitude dimmer than would be predicted from its observed Δm 15, and shows broad spectral features. W…
Large-scale Star-formation-driven Outflows at 1 < z < 2 in the 3D-HST Survey
Franx, Marijn; Labbé, Ivo; van Dokkum, Pieter +18 more
We present evidence of large-scale outflows from three low-mass (log(M */M ⊙) ~ 9.75) star-forming (SFR > 4 M ⊙ yr-1) galaxies observed at z = 1.24, z = 1.35, and z = 1.75 in the 3D-HST Survey. Each of these galaxies is located within a projected physical distance of 60 kpc around the sight line to th…
Is IGR J11014-6103 a Pulsar with the Highest Known Kick Velocity?
Rahoui, Farid; Bodaghee, Arash; Tomsick, John A. +4 more
We report on Chandra X-ray and Parkes radio observations of IGR J11014-6103, which is a possible pulsar wind nebula with a complex X-ray morphology and a likely radio counterpart. With the superb angular resolution of Chandra, we find evidence that a portion of the extended emission may be related to a bow shock due to the putative pulsar moving t…
Revealing the Millimeter Environment of the New FU Orionis Candidate HBC722 with the Submillimeter Array
Bourke, Tyler L.; Dunham, Michael M.; Chen, Xuepeng +3 more
We present 230 GHz Submillimeter Array continuum and molecular line observations of the newly discovered FU Orionis candidate HBC722. We report the detection of seven 1.3 mm continuum sources in the vicinity of HBC722, none of which corresponds to HBC722 itself. We compile infrared and submillimeter continuum photometry of each source from previou…