Search Publications
Dust emission in star-forming dwarf galaxies: General properties and the nature of the submm excess
Izotov, Y. I.; Henkel, C.; Guseva, N. G. +2 more
We studied the global characteristics of dust emission in a large sample of emission-line star-forming galaxies. The sample consists of two subsamples. One subsample (SDSS sample) includes ~4000 compact star-forming galaxies from the Sloan Digital Sky Survey (SDSS), which were also detected in all four bands at 3.4 µm, 4.6 µm, 12 &micr…
Herschel-ATLAS and ALMA. HATLAS J142935.3-002836, a lensed major merger at redshift 1.027
Ivison, R. J.; Fu, Hai; Dunne, Loretta +36 more
Context. The submillimetre-bright galaxy population is believed to comprise, aside from local galaxies and radio-loud sources, intrinsically active star-forming galaxies, the brightest of which are lensed gravitationally. The latter enable studies at a level of detail beyond what is usually possible by the observation facility.
Aims: This wor…
Physical conditions of molecular gas in the Circinus galaxy Multi-J CO and Ci 3PP0 observations
Menten, Karl M.; Gao, Yu; Zhang, Zhi-Yu +6 more
We report mapping observations of the 12CO J = 3 → 2, 4 → 3, 6 → 5, and 7 → 6 transitions and the Ci 3PP0 (Ci) 492GHz transition toward the central 40'' × 40'' region of the Circinus galaxy, using the Atacama Pathfinder EXperiment (APEX) telescope. We also detected 13COJ = 3 → 2 at the central position o…
Distributed Low-mass Star Formation in the IRDC G34.43+00.24
Jackson, James M.; Foster, Jonathan B.; Sanhueza, Patricio +9 more
We have used deep near-infrared observations with adaptive optics to discover a distributed population of low-mass protostars within the filamentary Infrared Dark Cloud G34.43+00.24. We use maps of dust emission at multiple wavelengths to determine the column density structure of the cloud. In combination with an empirically verified model of the …
Direct Measurement of Interstellar Extinction toward Young Stars Using Atomic Hydrogen Lyα Absorption
Edwards, Suzan; Herczeg, Gregory J.; Brown, Alexander +5 more
Interstellar reddening corrections are necessary to reconstruct the intrinsic spectral energy distributions (SEDs) of accreting protostellar systems. The stellar SED determines the heating and chemical processes that can occur in circumstellar disks. Measurement of neutral hydrogen absorption against broad Lyα emission profiles in young stars can …
Age and metallicity gradients support hierarchical formation for M87
Trujillo, Ignacio; Montes, Mireia; Prieto, M. Almudena +1 more
In order to probe the inside-out formation of the most massive galaxies in the Universe, we have explored the radial (0.1 ≲ R ≲ 8 kpc) variation of the spectral energy distribution of M87 from UV to IR. For this purpose, we have combined high-resolution data in 16 different bands. Our analysis indicate that the age of the stellar population of M87…
Carbon in different phases ([CII], [CI], and CO) in infrared dark clouds: Cloud formation signatures and carbon gas fractions
Henning, Th.; Krause, O.; Ossenkopf, V. +8 more
Context. How molecular clouds form out of the atomic phase and what the relative fractions of carbon are in the ionized, atomic, and molecular phase are questions at the heart of cloud and star formation.
Aims: We want to understand the kinematic processes of gas flows during the formation of molecular clouds. In addition to that, we aim at d…
Global model of low-frequency chorus (fLHR<f<0.1fce) from multiple satellite observations
Meredith, Nigel P.; Horne, Richard B.; Thorne, Richard M. +2 more
Whistler mode chorus is an important magnetospheric emission, playing a dual role in the acceleration and loss of relativistic electrons in the Earth's outer radiation belt. Chorus is typically generated in the equatorial region in the frequency range 0.1-0.8 fce, where fce is the local electron gyrofrequency. However, as the…
Herschel Observations of EXtra-Ordinary Sources: H2S as a Probe of Dense Gas and Possibly Hidden Luminosity Toward the Orion KL Hot Core
Bergin, E. A.; Crockett, N. R.; Blake, G. A. +3 more
We present Herschel/HIFI observations of the light hydride H2S obtained from the full spectral scan of the Orion Kleinmann-Low nebula (Orion KL) taken as part of the Herschel Observations of EXtra-Ordinary Sources GT (guaranteed time) key program. In total, we observe 52, 24, and 8 unblended or slightly blended features from H2
X-rays from the redshift 7.1 quasar ULAS J1120+0641.
Page, M. J.; Hewett, P. C.; Warren, S. J. +4 more
We present X-ray imaging and spectroscopy of the redshift z = 7.084 radio-quiet quasar ULAS J112001.48+064124.3 obtained with Chandra and XMM-Newton. The quasar is detected as a point source with both observatories. The Chandra observation provides a precise position, confirming the association of the X-ray source and the quasar, while a sufficien…