Search Publications
Star formation in AGN hosts in GOODS-N
Berta, S.; Magnelli, B.; Nordon, R. +40 more
Sensitive Herschel far-infrared observations can break degeneracies that were inherent to previous studies of star formation in high-z AGN hosts. Combining PACS 100 and 160 µm observations of the GOODS-N field with 2 Ms Chandra data, we detect 20% of X-ray AGN individually at >3σ. The host far-infrared luminosity of AGN with L2-10 ke…
Mid- and far-infrared luminosity functions and galaxy evolution from multiwavelength Spitzer observations up to z ~ 2.5
Bondi, M.; Cimatti, A.; Rodighiero, G. +25 more
Context. Studies of the infrared (IR) emission of cosmic sources have proven essential to constraining the evolutionary history of cosmic star formation and the gravitational accretion of nuclear black holes, because many of these events occur inside heavily dust-extinguished environments.
Aims: The Spitzer Space Telescope has provided a larg…
Dust temperature tracing the ISRF intensity in the Galaxy
Juvela, M.; Lagache, G.; Marshall, D. J. +29 more
New observations with Herschel allow accurate measurement of the equilibrium temperature of large dust grains heated by the interstellar radiation field (ISRF), which is critical in deriving dust column density and masses. We present temperature maps derived from the Herschel SPIRE and PACS data in two fields along the Galactic plane, obtained as …
First detection of VHE γ-rays from SN 1006 by HESS
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +178 more
Aims: Recent theoretical predictions of the lowest very high energy (VHE) luminosity of SN 1006 are only a factor 5 below the previously published HESS upper limit, thus motivating further in-depth observations of this source.
Methods: Deep observations at VHE energies (above 100 GeV) were carried out with the high energy stereoscopic sy…
Herschel-SPIRE observations of the Polaris flare: Structure of the diffuse interstellar medium at the sub-parsec scale
Miville-Deschênes, M. -A.; Boulanger, F.; Abergel, A. +43 more
We present a power spectrum analysis of the Herschel-SPIRE observations of the Polaris flare, a high Galactic latitude cirrus cloud midway between the diffuse and molecular phases. The SPIRE images of the Polaris flare reveal for the first time the structure of the diffuse interstellar medium down to 0.01 parsec over a 10 square degrees region. Th…
Interstellar OH+, H2O+ and H3O+ along the sight-line to G10.6-0.4
Perault, M.; Boulanger, F.; Falgarone, E. +50 more
We report the detection of absorption lines by the reactive ions OH+, H2O+and H3O+ along the line of sight to the submillimeter continuum source G10.6-0.4 (W31C). We used the Herschel HIFI instrument in dual beam switch mode to observe the ground state rotational transitions of OH+ …
The Crab Nebula as a standard candle in very high-energy astrophysics
Horns, D.; Meyer, M.; Zechlin, H. -S.
The continuum high-energy gamma-ray emission between 1 GeV and 105 GeV from the Crab Nebula has been measured for the first time in overlapping energy bands by the Fermi large-area telescope (Fermi/LAT) below ≈100 GeV and by ground-based imaging air Cherenkov telescopes (IACTs) above ≈60 GeV. To follow up on the phenomenological approac…
Herschel/HIFI observations of interstellar OH+ and H2O+ towards W49N: a probe of diffuse clouds with a small molecular fraction
Menten, K. M.; Perault, M.; Boulanger, F. +50 more
We report the detection of absorption by interstellar hydroxyl cations and water cations, along the sight-line to the bright continuum source W49N. We have used Herschel's HIFI instrument, in dual beam switch mode, to observe the 972 GHz N = 1-0 transition of OH+ and the 1115 GHz 111-000 transition of ortho-H2…
HerMES: Far infrared properties of known AGN in the HerMES fields
Aussel, H.; Elbaz, D.; Pérez-Fournon, I. +72 more
Nuclear and starburst activity are known to often occur concomitantly. Herschel-SPIRE provides sampling of the far-infrared (FIR) spectral energy distributions (SEDs) of type 1 and type 2 AGN, allowing for the separation between the hot dust (torus) and cold dust (starburst) emission. We study large samples of spectroscopically confirmed type 1 an…
New 3D gas density maps of NaI and CaII interstellar absorption within 300 pc
Lallement, R.; Welsh, B. Y.; Vergely, J. -L. +1 more
Aims: We present new high resolution (R > 50 000) absorption measurements of the NaI doublet (5889-5895 Å) along 482 nearby sight-lines, in addition to 807 new measurements of the CaII K (3933 Å) absorption line. We have combined these new data with previously reported measurements to produce a catalog of absorptions towards a total of 185…