Outputs (11)

TeV γ-ray observations of the young synchrotron-dominated SNRs G1.9+0.3 and G330.2+1.0 with H.E.S.S (2014)
Journal Article
Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., Anton, G., …Zechlin, H. (2014). TeV γ-ray observations of the young synchrotron-dominated SNRs G1.9+0.3 and G330.2+1.0 with H.E.S.S. Monthly Notices of the Royal Astronomical Society, 441(1), 790-799. https://doi.org/10.1093/mnras/stu459

The non-thermal nature of the X-ray emission from the shell-type supernova remnants (SNRs) G1.9+0.3 and G330.2+1.0 is an indication of intense particle acceleration in the shock fronts of both objects. This suggests that the SNRs are prime candidates... Read More about TeV γ-ray observations of the young synchrotron-dominated SNRs G1.9+0.3 and G330.2+1.0 with H.E.S.S.

Search for TeV Gamma-ray emission from GRB 100621A, an extremely bright GRB in X-rays, with H.E.S.S (2014)
Journal Article
Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., Anton, G., …Zechlin, H. (2014). Search for TeV Gamma-ray emission from GRB 100621A, an extremely bright GRB in X-rays, with H.E.S.S. Astronomy & Astrophysics, 565, Article A16. https://doi.org/10.1051/0004-6361/201322984

The long gamma-ray burst (GRB) 100621A, at the time the brightest X-ray transient ever detected by Swift-XRT in the 0.3–10 keV range, has been observed with the H.E.S.S. imaging air Cherenkov telescope array, sensitive to gamma radiation in the very-... Read More about Search for TeV Gamma-ray emission from GRB 100621A, an extremely bright GRB in X-rays, with H.E.S.S.

HESS J1640-465 - an exceptionally luminous TeV γ-ray supernova remnant (2014)
Journal Article
Abramowski, A., Aharonian, F., Benkhali, F., Akhperjanian, A., Angüner, E., Anton, G., …Zechlin, H. (2014). HESS J1640-465 - an exceptionally luminous TeV γ-ray supernova remnant. Monthly Notices of the Royal Astronomical Society, 439(3), 2828-2836. https://doi.org/10.1093/mnras/stu139

The results of follow-up observations of the TeV γ-ray source HESS J1640−465 from 2004 to 2011 with the High Energy Stereoscopic System (HESS) are reported in this work. The spectrum is well described by an exponential cut-off power law with photon i... Read More about HESS J1640-465 - an exceptionally luminous TeV γ-ray supernova remnant.

Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011 (2014)
Journal Article
Collaboration, H., Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., …Zechlin, H. (2014). Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011. Astronomy & Astrophysics, 564, Article A9. https://doi.org/10.1051/0004-6361/201322897

Context. About 40% of the observation time of the High Energy Stereoscopic System (H.E.S.S.) is dedicated to studying active galactic nuclei (AGN), with the aim of increasing the sample of known extragalactic very-high-energy (VHE, E > 100 GeV) sourc... Read More about Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011.

Revealing the Location and Structure of the Accretion Disk Wind in PDS 456 (2014)
Journal Article
Gofford, J., Reeves, J., Braito, V., Nardini, E., Costa, M., Matzeu, G., …Miller, L. (2014). Revealing the Location and Structure of the Accretion Disk Wind in PDS 456. Astrophysical Journal, 784(1), Article 77. https://doi.org/10.1088/0004-637x/784/1/77

We present evidence for the rapid variability of the high-velocity iron K-shell absorption in the nearby (z = 0.184) quasar PDS 456. From a recent long Suzaku observation in 2013 (~1 Ms effective duration), we find that the equivalent width of iron K... Read More about Revealing the Location and Structure of the Accretion Disk Wind in PDS 456.

Constraints on the outer radius of the broad emission line region of active galactic nuclei (2014)
Journal Article
Landt, H., Ward, M., Elvis, M., & Karovska, M. (2014). Constraints on the outer radius of the broad emission line region of active galactic nuclei. Monthly Notices of the Royal Astronomical Society, 439(1), 1051-1062. https://doi.org/10.1093/mnras/stu031

Here we present observational evidence that the broad emission line region (BELR) of active galactic nuclei (AGN) generally has an outer boundary. This was already clear for sources with an obvious transition between the broad and narrow components o... Read More about Constraints on the outer radius of the broad emission line region of active galactic nuclei.

HESS J1818–154, a new composite supernova remnant discovered in TeV gamma rays and X-rays (2014)
Journal Article
Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., Anton, G., …Zechlin, H. (2014). HESS J1818–154, a new composite supernova remnant discovered in TeV gamma rays and X-rays. Astronomy & Astrophysics, 562, Article A40. https://doi.org/10.1051/0004-6361/201322914

Composite supernova remnants (SNRs) constitute a small subclass of the remnants of massive stellar explosions where non-thermal radiation is observed from both the expanding shell-like shock front and from a pulsar wind nebula (PWN) located inside of... Read More about HESS J1818–154, a new composite supernova remnant discovered in TeV gamma rays and X-rays.

H.E.S.S. observations of the Crab during its March 2013 GeV gamma- ray flare (2014)
Journal Article
Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., Anton, G., …Zechlin, H. (2014). H.E.S.S. observations of the Crab during its March 2013 GeV gamma- ray flare. Astronomy & Astrophysics, 562, Article L4. https://doi.org/10.1051/0004-6361/201323013

Context. On March 4, 2013 the Fermi-LAT and AGILE reported a flare from the direction of the Crab nebula in which the high-energy (HE; E > 100 MeV) flux was six times above its quiescent level. Simultaneous observations in other energy bands give us... Read More about H.E.S.S. observations of the Crab during its March 2013 GeV gamma- ray flare.

Search for extended γ-ray emission around AGN with H.E.S.S. and Fermi-LAT (2014)
Journal Article
Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., Anton, G., …Malyshev, D. (2014). Search for extended γ-ray emission around AGN with H.E.S.S. and Fermi-LAT. Astronomy & Astrophysics, 562, Article A145. https://doi.org/10.1051/0004-6361/201322510

Context. Very-high-energy (VHE; E > 100 GeV) γ-ray emission from blazars inevitably gives rise to electron-positron pair production through the interaction of these γ-rays with the extragalactic background light (EBL). Depending on the magnetic field... Read More about Search for extended γ-ray emission around AGN with H.E.S.S. and Fermi-LAT.

Long-term TeV and X-Ray Observations of the Gamma-Ray Binary HESS J0632+057 (2014)
Journal Article
Aliu, E., Archambault, S., Aune, T., Behera, B., Beilicke, M., Benbow, W., …Zechlin, H. (2014). Long-term TeV and X-Ray Observations of the Gamma-Ray Binary HESS J0632+057. Astrophysical Journal, 780(2), Article 168. https://doi.org/10.1088/0004-637x/780/2/168

HESS J0632+057 is the only gamma-ray binary known so far whose position in the sky allows observations with ground-based observatories in both the northern and southern hemispheres. Here we report on long-term observations of HESS J0632+057 conducted... Read More about Long-term TeV and X-Ray Observations of the Gamma-Ray Binary HESS J0632+057.