Search Publications
A Light Echo from Type Ia SN 1995E?
Quinn, Jason L.; Garnavich, Peter M.; Li, Weidong +4 more
We identify a light echo candidate from Hubble Space Telescope (HST) imaging of NGC 2441, the host galaxy of the Type Ia supernova 1995E. From the echo's angular size and the estimated distance to the host galaxy, we find a distance of 207+/-35 pc between the dust and the site of the supernova. If confirmed, this echo brings the total number of ob…
X-rays from HH 210 in the Orion nebula
Grosso, N.; Kastner, J. H.; Bally, J. +3 more
We report the detection during the Chandra Orion Ultradeep Project (COUP) of two soft, constant, and faint X-ray sources associated with the Herbig-Haro object HH 210. HH 210 is located at the tip of the NNE finger of the emission line system bursting out of the BN-KL complex, northwest of the Trapezium cluster in the OMC-1 molecular cloud. Using …
The Virgo High-Resolution CO Survey: VI. Gas Dynamics and Star Formation along the Bar in NGC 4303
Koda, Jin; Sofue, Yoshiaki
We present CO interferometer observations of the barred galaxy NGC 4303 (M 61). This galaxy has a strong gas concentration at the central region and prominent offset ridges at the leading sides of the bar. Sharp velocity gradients are apparent across the ridges. The brightness temperature in the ridges is low, indicating the existence of unresolve…
The Nature of Blue Early-Type Galaxies in the GOODS Fields
Lee, Myung Gyoon; Hwang, Ho Seong; Lee, Joon Hyeop
We present a study of the nature of the blue early-type galaxies (BEGs) in the GOODS North and South fields using the GOODS archival HST ACS data. Using visual inspection, we have selected 58 BEGs and 113 normal red early-type galaxies (REGs) in the sample of 1949 galaxies with spectroscopic redshifts. We find that the BEGs are generally bluer, fa…
INTEGRAL observations of the Crab pulsar
Cusumano, G.; Foschini, L.; Di Cocco, G. +5 more
Aims.The paper presents the timing and spectral analysis of several observations of the
Methods: .All these observations, when summed together provide a high statistics data set which can be used for accurate phase resolved spectroscopy. A detailed study of …
X-ray emission from the blazar AO 0235+16 : the XMM-Newton and Chandra point of view
Villata, M.; Orio, M.; Raiteri, C. M. +4 more
We analyse five observations of the BL Lac object
Failed disc winds: a physical origin for the soft X-ray excess?
Schurch, N. J.; Done, C.
The origin of the soft X-ray excess emission observed in many type-1 active galactic nuclei (AGN) has been an unresolved problem in X-ray astronomy for over two decades. We develop the model proposed by Gierliński & Done, which models the soft excess with heavily smeared, ionized, absorption, by including the emission that must be associated w…
An XMM-Newton observation of the massive edge-on Sb galaxy NGC 2613
Wang, Q. D.; Li, Z.; Irwin, J. A. +1 more
We present an XMM-Newton observation of the massive edge-on Sb galaxy NGC 2613. We discover that this galaxy contains a deeply embedded active nucleus with a 0.3-10 keV luminosity of 3.3 × 1040ergs-1 and a line-of-sight absorption column of 1.2 × 1023cm-2. Within the 25 magarcsec-2 optical B-b…
NGC 4435: a bulge-dominated galaxy with an unforeseen low-mass central black hole
Dalla Bontà, E.; Corsini, E. M.; Pizzella, A. +3 more
We present the ionized gas kinematics of the SB0 galaxy NGC 4435 from spectra obtained with the Space Telescope Imaging Spectrograph. This galaxy has been selected on the basis of its ground-based spectroscopy, for displaying a position-velocity diagram consistent with the presence of a circumnuclear Keplerian disc rotating around a supermassive b…
Chandra Observations of the Transient 7 s X-ray Pulsar AX J1845.0-0258
Gotthelf, E. V.; Gaensler, B. M.; Kaspi, V. M. +1 more
We present the results of Chandra X-Ray Observatory observations of the transient anomalous X-ray pulsar candidate AX J1845.0-0258 in apparent quiescence. Within the source's error circle, we find a point source and possible counterpart, which we designate CXOU J184454.6-025653. No coherent pulsations are detected, and no extended emission is seen…