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72 papers · 1 filter
Multiwavelength Observations of the Blazar Mrk 421 in December 2002 and January 2003
P. Rebillot, M. Aller, H. Aller +5
We report on a multiwavelength campaign on the TeV gamma-ray blazar Markarian (Mrk) 421 performed during December 2002 and January 2003. These target of opportunity observations we…
X-ray flare modeling in the single giant HR 9024
Paola Testa, David Garcia-Alvarez, Fabio Reale +1
We analyze a Chandra-HETGS observation of the single G-type giant HR 9024. The high flux allows us to examine spectral line and continuum diagnostics at high temporal resolution, t…
Two Populations of Young Massive Star Clusters in Arp 220
Christine D. Wilson, William E. Harris, Rebecca Longden +1
We present new optical observations of young massive star clusters in Arp 220, the nearest ultraluminous infrared galaxy, taken in UBVI with the Hubble Space Telescope ACS/HRC came…
Chandra Multiwavelength Project: Normal Galaxies at Intermediate Redshift
D. -W. Kim, W. A. Barkhouse, E. R. Colmenero +11
(abridged) We have investigated 136 Chandra extragalactic sources without broad optical emission lines, including 93 galaxies with narrow emission lines (NELG) and 43 with only abs…
The Outburst of HST-1 in the M87 Jet
D. E. Harris, C. C. Cheung, J. A. Biretta +4
The X-ray intensity of knot HST-1, 0.85" from the nucleus of the radio galaxy M87, has increased by more than a factor of 50 during the last 5 years. The optical increase is simila…
Chandra Observation of the Magellanic Cloud Supernova Remnant 0454-672 in N9
F. D. Seward, R. M. Williams, Y. -H. Chu +3
A Chandra observation has defined the extent of the SNR B 0454-692 in the LMC H II region N9. The remnant has dimension 2.3" x 3.6" and is elongated in the NS direction. The bright…