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VERITAS Observations of Six Bright, Hard-Spectrum Fermi-LAT Blazars
E. Aliu, S. Archambault, T. Arlen +84
We report on VERITAS very-high-energy (VHE; E>100 GeV) observations of six blazars selected from the Fermi Large Area Telescope First Source Catalog (1FGL). The gamma-ray emission…
On the redshift of the blazar PKS0447-439
Michele Fumagalli, Amy Furniss, John M. O'Meara +3
PKS0447-439 is one of the BL Lacertae objects that have been detected at very high energy. There has been a recent report of a lower limit of z>1.246 for the redshift of this blaza…
65 kpc of ionized gas trailing behind NGC 4848 during its first crossing of the Coma cluster
Matteo Fossati, Giuseppe Gavazzi, Alessandro Boselli +1
In a 5 hour Halpha exposure of the N-W region of the Coma cluster with the 2.1m telescope at SPM (Mx) we discovered a 65 kpc cometary emission of ionized gas trailing behind the SB…
Halpha3: Halpha imaging survey of HI selected galaxies from ALFALFA
Giuseppe Gavazzi, Michele Fumagalli, Vincenzo Galardo +5
We present Halpha3 (acronym for Halpha-alpha-alpha), an Halpha narrow-band imaging survey of ~400 galaxies selected from the HI Arecibo Legacy Fast ALFA Survey (ALFALFA) in the Loc…
A search of CO emission lines in blazars: the low molecular gas content of BL Lac objects compared to quasars
Michele Fumagalli, Miroslava Dessauges-Zavadsky, Amy Furniss +4
BL Lacertae (Lac) objects that are detected at very-high energies (VHE) are of fundamental importance to study multiple astrophysical processes, including the physics of jets, the…
Stripped gas as fuel for newly formed HII regions in the encounter between VCC1249 and M49: a unified picture from NGVS and GUViCS
Fabrizio Arrigoni Battaia, Giuseppe Gavazzi, Michele Fumagalli +15
Context: We study the peculiar interacting galaxy system of VCC1249/M49 located in the core of the Virgo B subcluster. Owing to a recent interaction between the dwarf galaxy VCC124…