Search Publications
The HST view of the broad line region in low luminosity AGN
Capetti, A.; Balmaverde, B.
We analyze the properties of the broad line region (BLR) in low luminosity AGN by using HST/STIS spectra. We consider a sample of 24 nearby galaxies in which the presence of a BLR has been reported from their Palomar ground-based spectra. Following a widely used strategy, we used the [S II] doublet to subtract the contribution of the narrow emissi…
CLASH: Photometric redshifts with 16 HST bands in galaxy cluster fields
Infante, L.; Zheng, W.; Molino, A. +35 more
Context. The Cluster Lensing And Supernovae survey with Hubble (CLASH) is a Hubble Space Telescope (HST) Multi-Cycle Treasury programme thatobserves 25 massive galaxy clusters, 20 of which were X-ray-selected to preferably choose dynamically relaxed clusters, and 5 additional "high magnification" clusters, which were selected based on their optica…
Origin and z-distribution of Galactic diffuse [C II] emission
Langer, W. D.; Velusamy, T.
Context. The [C ii] emission is an important probe of star formation in the Galaxy and in external galaxies. The GOT C+ survey and its follow up observations of spectrally resolved 1.9 THz [C ii] emission using Herschel HIFI provides the data needed to quantify the Galactic interstellar [C ii] gas components as tracers of star formation.
Aims…
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…
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…
Physical properties of the jet from DG Tauri on sub-arcsecond scales with HST/STIS
Ray, T. P.; Eislöffel, J.; Podio, L. +5 more
Context. Stellar jets are believed to play a key role in star formation, but the question of how they originate is still being debated.
Aims: We derive the physical properties at the base of the jet from DG Tau both along and across the flow and as a function of velocity.
Methods: We analysed seven optical spectra of the DG Tau jet, take…
Cross-calibration of the XMM-Newton EPIC pn and MOS on-axis effective areas using 2XMM sources
Read, A. M.; Guainazzi, M.; Sembay, S.
Aims: We aim to examine the relative cross-calibration accuracy of the on-axis effective areas of the XMM-Newton EPIC pn and MOS instruments.
Methods: Spectra from a sample of 46 bright, high-count, non-piled-up, isolated on-axis point sources are stacked together, and model residuals are examined to characterize the EPIC MOS-to-pn inter…
Spectral and temporal properties of RX J0520.5-6932 (LXP 8.04) during a type-I outburst
Haberl, F.; Udalski, A.; Sturm, R. +2 more
Aims: We observed RX J0520.5-6932 in the X-rays and studied the optical light curve of its counterpart to verify it as a Be/X-ray binary.
Methods: We performed an XMM-Newton anticipated target-of-opportunity observation in January 2013 during an X-ray outburst of the source in order to search for pulsations and derive its spectral proper…