Zobrazeno 1 - 10
of 3 083
pro vyhledávání: '"Gallagher S."'
Autor:
Khatu, V. C., Gallagher, S. C., Horne, K., Cackett, E. M., Hu, C., Pasquini, S., Hall, P., Wang, J. -M., Bian, W. -H., Li, Y. -R., Bai, J. -M., Chen, Y. -J., Du, P., Goad, M., Jiang, B. -W., Li, S. -S., Songsheng, Y. -Y., Wang, C., Xiao, M., Yu, Z.
We performed a rigorous reverberation-mapping analysis of the broad-line region (BLR) in a highly accreting ($L/L_{\mathrm{Edd}}=0.74-3.4$) active galactic nucleus, Markarian 142 (Mrk 142), for the first time using concurrent observations of the inne
Externí odkaz:
http://arxiv.org/abs/2309.13418
Autor:
Matthews, Brandon M., Dix, Cooper, Shemmer, Ohad, Brotherton, Michael S., Myers, Adam D., Andruchow, I., Brandt, W. N., Gallagher, S. C., Green, Richard, Lira, Paulina, McLane, Jacob N., Plotkin, Richard M., Richards, Gordon T., Runnoe, Jessie C., Schneider, Donald P., Strauss, Michael A.
Quasars at $z~{\gtrsim}~1$ most often have redshifts measured from rest-frame ultraviolet emission lines. One of the most common such lines, C IV ${\lambda}1549$, shows blueshifts up to ${\approx}~5000~\rm{km~s^{-1}}$, and in rare cases even higher.
Externí odkaz:
http://arxiv.org/abs/2304.09964
Autor:
Appleton, P. N., Guillard, P., Emonts, B., Boulanger, F., Togi, A., Reach, W. T., Alatalo, K., Cluver, M., Santos, T. Diaz, Duc, P-A., Gallagher, S., Ogle, P., O'Sullivan, E., Voggel, K., Xu, C. K.
We combine JWST and HST imaging with ALMA~CO(2-1) spectroscopy to study the highly turbulent multi-phase intergalactic medium (IGM) in Stephan's Quintet on 25-150 pc scales. Previous Spitzer observations revealed luminous H$_2$ line cooling across a
Externí odkaz:
http://arxiv.org/abs/2301.02928
Autor:
Wang, Chaojun, Luo, B., Brandt, W. N., Alexander, D. M., Bauer, F. E., Gallagher, S. C., Huang, Jian, Liu, Hezhen, Stern, D.
We utilize recent NuSTAR observations (co-added depth $\approx55$-120 ks) of PG $1001+054$, PG $1254+047$, and PHL 1811 to constrain their hard X-ray ($\gtrsim5$ keV) weakness and spectral shapes, and thus to investigate the nature of their extreme X
Externí odkaz:
http://arxiv.org/abs/2208.04961
Publikováno v:
In Radiography July 2024 30(4):1026-1034
We study the connection between the X-ray and UV properties of the broad absorption line (BAL) wind in the highly X-ray variable quasar PG 2112+059 by comparing Chandra-ACIS data with contemporaneous UV HST/STIS spectra in three different epochs. We
Externí odkaz:
http://arxiv.org/abs/2106.06567
Autor:
Guillard, P., Appleton, P. N, Boulanger, F., Shull, J. M., Lehnert, M. D., Forets, G. Pineau des, Falgarone, E., Cluver, M. E., Xu, C. K., Gallagher, S. C., Duc, P. A.
We present Hubble Space Telescope Cosmic Origin Spectrograph (COS) UV line spectroscopy and integral-field unit (IFU) observations of the intra-group medium in Stephan's Quintet (SQ). SQ hosts a 30 kpc long shocked ridge triggered by a galaxy collisi
Externí odkaz:
http://arxiv.org/abs/2102.06843
Autor:
Liu, Hezhen, Luo, B., Brandt, W. N., Brotherton, Michael S., Gallagher, S. C., Ni, Q., Shemmer, Ohad, Timlin III, J. D.
We present a systematic X-ray and multiwavelength study of a sample of 47 active galactic nuclei (AGNs) with reverberation-mapping measurements. This sample includes 21 super-Eddington accreting AGNs and 26 sub-Eddington accreting AGNs. Using high-st
Externí odkaz:
http://arxiv.org/abs/2102.02832
Autor:
Matthews, Brandon M., Shemmer, Ohad, Dix, Cooper, Brotherton, Michael S., Myers, Adam D., Andruchow, I., Brandt, W. N., Ferrero, Gabriel A., Gallagher, S. C., Green, Richard, Lira, Paulina, Plotkin, Richard M., Richards, Gordon T., Runnoe, Jessie C., Schneider, Donald P., Shen, Yue, Strauss, Michael A., Wills, Beverley J.
We present spectroscopic measurements for 226 sources from the Gemini Near Infrared Spectrograph - Distant Quasar Survey (GNIRS-DQS). Being the largest uniform, homogeneous survey of its kind, it represents a flux-limited sample ($m_{i}$ ${\lesssim}$
Externí odkaz:
http://arxiv.org/abs/2011.10895
Autor:
Woods, T. E., Alexandroff, R. M., Ellison, S. L., Ferrarese, L., Gallagher, S. C., Gallo, L., Haggard, D., Hall, P. B., Hlavacek-Larrondo, J., Khatu, V. C., Man, A. W. S., McGee, S., McNamara, B. R., Ruan, J., Sivakoff, G., Stairs, I. H., Willott, C.
The next generation of electromagnetic and gravitational wave observatories will open unprecedented windows to the birth of the first supermassive black holes. This has the potential to reveal their origin and growth in the first billion years, as we
Externí odkaz:
http://arxiv.org/abs/1910.06346