Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Ptak, Andrew F."'
Autor:
Lambrides, Erini, Chiaberge, Marco, Long, Arianna, Liu, Daizhong, Akins, Hollis B., Ptak, Andrew F., Andika, Irham Taufik, Capetti, Alessandro, Casey, Caitlin M., Champagne, Jaclyn B., Chworowsky, Katherine, Clarke, Tracy E., Cooper, Olivia R., Ding, Xuheng, Dong, Dillon Z., Faisst, Andreas L., Forman, Jordan Y., Franco, Maximilien, Gillman, Steven, Gozaliasl, Ghassem, Hall, Kirsten R., Harish, Santosh, Hayward, Christopher C., Hirschmann, Michaela, Hutchison, Taylor A., Jahnke, Knud, Jin, Shuowen, Kartaltepe, Jeyhan S., Kleiner, Emma T., Koekemoer, Anton M., Kokorev, Vasily, Manning, Sinclaire M., Martin, Crystal L., McKinney, Jed, Norman, Colin, Nyland, Kristina, Onoue, Masafusa, Robertson, Brant E., Shuntov, Marko, Silverman, John D., Stiavelli, Massimo, Trakhtenbrot, Benny, Vardoulaki, Eleni, Zavala, Jorge A., Allen, Natalie, Ilbert, Olivier, McCracken, Henry Joy, Paquereau, Louise, Rhodes, Jason, Toft, Sune
In this letter, we report the discovery of the highest redshift, heavily obscured, radio-loud AGN candidate selected using JWST NIRCam/MIRI, mid-IR, sub-mm, and radio imaging in the COSMOS-Web field. Using multi-frequency radio observations and mid-I
Externí odkaz:
http://arxiv.org/abs/2308.12823
Autor:
LaMassa, Stephanie M., Yaqoob, Tahir, Boorman, Peter G., Tzanavaris, Panayiotis, Levenson, N. A., Gandhi, Poshak, Ptak, Andrew F., Heckman, Timothy M.
We present the analysis of Chandra and NuSTAR spectra of NGC 4968, a local (D$\sim$44 Mpc) 12$\mu$m-selected Seyfert 2 galaxy, enshrouded within Compton-thick layers of obscuring gas. We find no evidence of variability between the Chandra and NuSTAR
Externí odkaz:
http://arxiv.org/abs/1911.05813
Autor:
Vulic, Neven, Hornschemeier, Ann E., Wik, Daniel R., Yukita, Mihoko, Zezas, Andreas, Ptak, Andrew F., Lehmer, Bret D., Antoniou, Valsamo, Maccarone, Thomas J., Williams, Benjamin F., Fornasini, Francesca M.
Nearby galaxy surveys have long classified X-ray binaries (XRBs) by the mass category of their donor stars (high-mass and low-mass). The NuSTAR observatory, which provides imaging data at E $>10$ keV, has enabled the classification of extragalactic X
Externí odkaz:
http://arxiv.org/abs/1808.05617
Autor:
Jones, Mackenzie L., Hickox, Ryan C., Mutch, Simon J., Croton, Darren J., Ptak, Andrew F., DiPompeo, Michael A.
In studies of the connection between active galactic nuclei (AGN) and their host galaxies there is widespread disagreement on some key aspects stemming largely from a lack of understanding of the nature of the full underlying AGN population. Recent a
Externí odkaz:
http://arxiv.org/abs/1706.00430
Autor:
LaMassa, Stephanie M., Yaqoob, Tahir, Levenson, N. A., Boorman, Peter, Heckman, Timothy M., Gandhi, Poshak, Rigby, Jane R., Urry, C. Megan, Ptak, Andrew F.
We present the Chandra imaging and spectral analysis of NGC 4968, a nearby (z = 0.00986) Seyfert 2 galaxy. We discover extended ($\sim$1 kpc) X-ray emission in the soft band (0.5 - 2 keV) that is neither coincident with the narrow line region nor the
Externí odkaz:
http://arxiv.org/abs/1612.01996
Akademický článek
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Autor:
LaMassa, Stephanie M., Yaqoob, Tahir, Ptak, Andrew F., Jia, Jianjun, Heckman, Timothy M., Gandhi, Poshak, Urry, C. Meg
Using self-consistent, physically motivated models, we investigate the X-ray obscuration in 19 Type 2 [OIII] 5007 \AA\ selected AGN, 9 of which are local Seyfert 2 galaxies and 10 of which are Type 2 quasar candidates. We derive reliable line-of-sigh
Externí odkaz:
http://arxiv.org/abs/1404.0012
Autor:
Rana, Vikram, Harrison, Fiona A., Bachetti, Matteo, Walton, Dominic J., Furst, Felix, Barret, Didier, Miller, Jon M., Fabian, Andrew C., Boggs, Steven E., Christensen, Finn C., Craig, William W., Grefenstette, Brian W., Hailey, Charles J., Madsen, Kristin K., Ptak, Andrew F., Stern, Daniel, Webb, Natalie A., Zhang, William W.
We present results for two Ultraluminous X-ray Sources (ULXs), IC 342 X-1 and IC 342 X-2, using two epochs of XMM-Newton and NuSTAR observations separated by $\sim$7 days. We observe little spectral or flux variability above 1 keV between epochs, wit
Externí odkaz:
http://arxiv.org/abs/1401.4637
Autor:
Bachetti, Matteo, Rana, Vikram, Walton, Dominic J., Barret, Didier, Harrison, Fiona A., Boggs, Steven E., Christensen, Finn E., Craig, William W., Fabian, Andrew C., Fürst, Felix, Grefenstette, Brian W., Hailey, Charles J., Hornschemeier, Ann, Madsen, Kristin K., Miller, Jon M., Ptak, Andrew F., Stern, Daniel, Webb, Natalie A., Zhang, William W.
We present the results of NuSTAR and XMM-Newton observations of the two ultraluminous X-ray sources (ULX) NGC 1313 X-1 and X-2. The combined spectral bandpass of the two satellites enables us to produce the first spectrum of X-1 between 0.3 and 30 ke
Externí odkaz:
http://arxiv.org/abs/1310.0745
Autor:
Basu-Zych, Antara R., Lehmer, Bret D., Hornschemeier, Ann E., Goncalves, Thiago S., Fragos, Tassos, Heckman, Tim, Overzier, Roderik A., Ptak, Andrew F., Schiminovich, David
In this paper, we study the relationship between the 2-10 keV X-ray luminosity (L_X), assumed to originate from X-ray binaries (XRBs), and star formation rate (SFR) in UV-selected z<0.1 Lyman break analogs (LBAs). We present Chandra observations for
Externí odkaz:
http://arxiv.org/abs/1306.0906