Results 81 to 90 of about 5,289 (173)

Identification of a Helium Donor Star in NGC 247 ULX-1

The Astrophysical Journal, 2023
With Very Large Telescope Multi Unit Spectroscopic Explorer (MUSE) observations, we detected highly variable helium emission lines from the optical counterpart of the supersoft ultraluminous X-ray source (ULX) NGC 247 ULX-1.
Changxing Zhou, Hua Feng, Fuyan Bian
doaj   +1 more source

Ultraluminous X-ray sources out to z~0.3 in the COSMOS field [PDF]

, 2010
Using Chandra observations we have identified a sample of seven off-nuclear X-ray sources, in the redshift range z=0.072-0.283, located within optically bright galaxies in the COSMOS Survey.
A. Bongiorno, A. Comastri, A. Finoguenov, A. Fruscione, A. Iovino, A. M. Koekemoer, A. Merloni, A. Renzini, B. Garilli, C. Impey, C. Knobel, C. Maier, C. Scarlata, C. Vignali, Capak, Colbert, Colbert, D. Vergani, Damiani, E. Perez Montero, E. Ricciardelli, E. Zucca, Elvis, F. Civano, F. Fiore, F. Lamareille, Fabbiano, G. Coppa, G. Fabbiano, G. Zamorani, Gehrels, Gilfanov, Grimm, Hopman, Humphrey, Ilbert, Irwin, J. D. Silverman, J. Trump, J.-F. Le Borgne, J.-P. Kneib, K. Caputi, K. Kovač, Kennicutt, Kim, King, King, Körding, L. de Ravel, L. Tasca, L. Tresse, Lehmer, Lilly, Lilly, Liu, M. Aller, M. Bolzonella, M. Brusa, M. Carollo, M. Elvis, M. Mignoli, M. Salvato, M. Scodeggio, M. Tanaka, Maier, Makishima, Mignoli, Miller, Moustakas, N. Cappelluti, N. Scoville, O'Donnell, O. Cucciati, O. Ilbert, O. Le Fèvre, P. Capak, P. Franzetti, P. Kampczyk, Petrosian, Ptak, Puccetti, R. Gilli, R. Pello, Roberts, S. Bardelli, S. de la Torre, S. Lilly, S. Puccetti, Salvato, Scarlata, Seaton, Shakura, Swartz, T. Contini, T. L. Aldcroft, V. Le Brun, V. Mainieri, Volonteri, Y. Peng, Y. Taniguchi   +99 more
core   +5 more sources

ULTRALUMINOUS X-RAY SOURCES IN ARP 147 [PDF]

The Astrophysical Journal, 2010
The Chandra X-Ray Observatory was used to image the collisional ring galaxy Arp 147 for 42 ks. We detect nine X-ray sources with luminosities in the range of (1.4-7) x 10{sup 39} erg s{sup -1} (assuming that the sources emit isotropically) in or near the blue knots of star formation associated with the ring.
Pooley, D., Steinhorn, B., Rappaport, Saul A, Levine, Alan M   +3 more
openaire   +2 more sources

Ultraluminous X-ray sources with flat-topped noise and QPO

, 2019
We analyzed the X-ray power density spectra of five ultraluminous X-ray sources (ULXs) NGC5408 X-1, NGC6946 X-1, M82 X-1, NGC1313 X-1 and IC342 X-1 that are the only ULXs which display both flat-topped noise (FTN) and quasi-periodic oscillations (QPO ...
Atapin, K., Caballero-Garcia, M. D., Fabrika, S.   +2 more
core   +1 more source

Chandra Detects Low-luminosity Active Galactic Nucleus with MBH = 104–106 M⊙ in Nearby (z < 0.5) Dwarf and Star-forming Galaxies

The Astrophysical Journal
We searched the Chandra and XMM archives for 900 Green Pea galaxies to identify signs of active galactic nuclei (AGN). Green peas are low-mass, emission-line galaxies that resemble high-redshift dwarf galaxies. From 29 observations, we detected X-rays in
Mainak Singha, Julissa Sarmiento, Sangeeta Malhotra, James E. Rhoads, L. Y. Aaron Yung, Junxian Wang, Zhen-Ya Zheng, Ruqiu Lin, Keunho Kim, Jialai Kang, Santosh Harish   +10 more
doaj   +1 more source

X-ray Spectral Signatures of the Photon Bubble Model for Ultraluminous X-ray Sources

, 2007
The nature of ultraluminous X-ray sources in nearby galaxies is one of the major open questions in modern X-ray astrophysics. One possible explanation for these objects is an inhomogeneous, radiation dominated accretion disk around a $\sim 10 M_{\odot ...
Justin D. Finke, Markus Bottcher, Merloni A., Mizuno T., Pakull M. W., Pozdnyakov L. A., Shakura N. I., Stobbart A.-M.   +7 more
core   +1 more source

The Ultraluminous X-ray Sources near the Center of M82

, 2007
We report the identification of a recurrent ultraluminous X-ray source (ULX), a highly absorbed X-ray source (possibly a background AGN), and a young supernova remnant near the center of the starburst galaxy M82.
A. K. H. Kong, Boller T., C. S. J. Pun, D. S. Y. Mak, Guainazzi M., Markwardt C. B., Muxlow T. W. B., P.‐Y. Hsieh, Y. J. Yang   +8 more
core   +1 more source

The Birth of an Ultra-Luminous X-ray Source in M83

, 2012
A previously undetected X-ray source ...
Arnaud, Asplund, Bauer, Begelman, Belczynski, Berghea, Blackburn, Bradley C. Whitmore, Bresolin, Burderi, Castro-Tirado, Colbert, Colbert, Davis, de Jong, Dewangan, Dopita, Feng, Feng, Ferguson, Frank, Girardi, Grisé, Hameury, Hameury, Heger, Homan, Hornschemeier, Hynes, Immler, Irwin, Irwin, K. D. Kuntz, Kaaret, King, King, Knox S. Long, Kolmogorov, Kuntz, Laird, Liu, McClintock, Ohsuga, P. Frank Winkler, Pakull, Paul P. Plucinsky, Prestwich, Ptak, Roberto Soria, Romaniello, Saha, Salasnich, Shakura, Sivakoff, Snow, Soria, Soria, Strickland, Strickland, Swartz, Swartz, Tao, van Paradijs, Vrtilek, Walter, Whitehurst, William P. Blair, Winter   +67 more
core   +1 more source

Monitoring of the Spectral and Timing Properties of the Ultraluminous X-Ray Pulsar NGC 7793 P13

The Astrophysical Journal Letters
We present the long-term spectral and timing evolution of the ultraluminous X-ray pulsar NGC 7793 P13 from 2011 to 2024 based on archival data from XMM-Newton, Chandra, NICER, and NuSTAR, including unpublished data after 2020. This data set enables us to
Marina Yoshimoto, Tomokage Yoneyama, Shogo B. Kobayashi, Hirokazu Odaka, Taiki Kawamuro, Hironori Matsumoto   +5 more
doaj   +1 more source

Suzaku Observation of Two Ultraluminous X-Ray Sources in NGC 1313

, 2006
Two ultraluminous X-ray sources (ULXs) in the nearby Sb galaxy NGC 1313, named X-1 and X-2, were observed with Suzaku on 2005 September 15. During the observation for a net exposure of 28~ks (but over a gross time span of 90~ks), both objects varied in ...
Dewangan, G., Done, C., Ebisawa, K., Griffiths, R. E., Haba, Y., Isobe, N., Kokubun, M., Kotoku, J., Kubota, A., Makishima, K., Matsushita, K., Miyamoto, M., Miyawaki, R., Mizuno, T., Mushotzky, R. F., Namiki, M., Petre, R., Takahashi, H., Tamagawa, T., Terashima, Y., Ueda, Y., Winter, L.   +21 more
core   +1 more source