Search Publications
Search for polycyclic aromatic hydrocarbons in the Perseus molecular cloud with the Green Bank Telescope
Pérez, Laura M.; Maddalena, Ronald J.; Ali-Haïmoud, Yacine +1 more
Polycyclic aromatic hydrocarbons (PAHs) are believed to be the small-size tail of the interstellar carbonaceous dust grain population. Their vibrational emission is the most widely accepted source of the aromatic near-infrared features, and their rotational radiation is a likely explanation for the dust-correlated anomalous microwave emission (AME…
Echelle spectroscopy and photoionization modelling of the entire planetary nebula NGC 6210
Dufour, R. J.; Bohigas, J.; Rodríguez, M. +1 more
High-resolution spectroscopy of NGC 6210, show that recombination line abundances of O+2 and Ne+2 are two to three times larger than forbidden line abundances, Te(O+2) is smaller than Te(N+) and possibly Te(S+), the ionized mass is ≃0.07 M⊙ and the p…
H I study of the environment around ESO 243-49, the host galaxy of an intermediate-mass black hole
Combes, F.; Farrell, S. A.; Servillat, M. +9 more
The lenticular galaxy ESO 243-49 hosts the ultraluminous X-ray source HLX-1, the best candidate intermediate-mass black hole (IMBH) currently known. The environments of IMBHs remain unknown, however, the proposed candidates include the nuclei of dwarf galaxies or globular clusters. Evidence at optical wavelengths points at HLX-1 being the remnant …
Submm-bright X-ray-absorbed QSOs at z ∼ 2: insights into the coevolution of AGN and star formation
Page, M. J.; Symeonidis, M.; Stevens, J. A. +4 more
We have assembled a sample of five X-ray-absorbed and submm-luminous type 1 QSOs at z ∼ 2 which are simultaneously growing their central black holes through accretion and forming stars copiously. We present here the analysis of their rest-frame UV-to-submm spectral energy distributions (SEDs), including new Herschel data. Both AGN (direct and repr…
The contribution of faint galaxy wings to source-subtracted near-infrared background fluctuations
Donnerstein, R. L.
The source-subtracted, 1.1 and 1.6 µm NICMOS images used in earlier analyses of the near-infrared Hubble Ultra Deep Field contained residual flux in extended wings of identified sources that contributed an unknown amount to fluctuation power. When compared to the original results, a reanalysis after subtracting this residual flux shows that …
Constraints on the evolutionary mechanisms of massive galaxies since z ∼ 1 from their velocity dispersions
Pérez-González, P. G.; Falcón-Barroso, J.; Guzmán, R. +9 more
Several authors have reported that the dynamical masses of massive compact galaxies (M* ≳ 1011 M⊙, re ∼ 1 kpc), computed as Mdyn = 5.0 σe2 re/G, are lower than their stellar masses M*. In a previous study from our group, the discrepancy is interprete…
Deep X-ray spectroscopy and imaging of the Seyfert 2 galaxy, ESO 138-G001
Bianchi, S.; Vignali, C.; Piconcelli, E. +4 more
We present a spectral and imaging analysis of the XMM-Newton and Chandra observations of the Seyfert 2 galaxy ESO138-G001, with the aim of characterizing the circumnuclear material responsible for the soft (0.3-2.0 keV) and hard (5-10 keV) X-ray emission. We confirm that the source is absorbed by Compton-thick gas. However, if a self-consistent mo…
A spectroscopically confirmed z = 1.327 galaxy-scale deflector magnifying a z ∼ 8 Lyman-break galaxy in the Brightest of Reionizing Galaxies survey
Treu, T.; Trenti, M.; Oesch, P. A. +6 more
We present a detailed analysis of an individual case of gravitational lensing of a z ∼ 8 Lyman-break galaxy (LBG) in a blank field, identified in Hubble Space Telescope imaging obtained as part of the Brightest of Reionizing Galaxies survey. To investigate the close proximity of the bright (mAB = 25.8) Y098-dropout to a small…
Chemical abundances in the PN Wray16-423 in the Sagittarius dwarf spheroidal galaxy: constraining the dust composition
Otsuka, Masaaki
We performed a detailed analysis of elemental abundances, dust features, and polycyclic aromatic hydrocarbons (PAHs) in the C-rich planetary nebula (PN) Wray16-423 in the Sagittarius dwarf spheroidal galaxy, based on a unique data set taken from the Subaru/HDS, MPG/ESO FEROS, HST/WFPC2, and Spitzer/IRS. We performed the first measurements of Kr, F…
HerMES: disentangling active galactic nuclei and star formation in the radio source population
Hatziminaoglou, E.; Bock, J.; Cooray, A. +12 more
We separate the extragalactic radio source population above ∼50 µJy into active galactic nuclei (AGN) and star-forming sources. The primary method of our approach is to fit the infrared spectral energy distributions (SEDs), constructed using Spitzer/IRAC (Infrared Array Camera) and Multiband Imaging Photometer for Spitzer (MIPS) and Herschel…