Zobrazeno 1 - 10
of 270
pro vyhledávání: '"Gallagher, S C"'
Autor:
Emonts, B. H. C., Appleton, P. N., Lisenfeld, U., Guillard, P., Xu, C. K., Reach, W. T., Barcos-Munoz, L., Labiano, A., Ogle, P. M., O'Sullivan, E., Togi, A., Gallagher, S. C., Aromal, P., Duc, P. -A., Alatalo, K., Boulanger, F., Diaz-Santos, T., Helou, G.
We present the large-scale distribution and kinematics of cold molecular gas across the compact galaxy group Stephan's Quintet, based on CO(2-1) observations performed with the Atacama Compact Array (ACA) and CO(1-0) data from the Combined Array for
Externí odkaz:
http://arxiv.org/abs/2411.14310
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:
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
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
Autor:
Liu, Hezhen, Luo, B., Brandt, W. N., Brotherton, Michael S., Du, Pu, Gallagher, S. C., Hu, Chen, Shemmer, Ohad, Wang, Jian-Min
We report the discovery of extreme X-ray variability in a type 1 quasar: SDSS J$075101.42+291419.1$. It has a black hole mass of $1.6\times 10^7~\rm M_\odot$ measured from reverberation mapping (RM), and the black hole is accreting with a super-Eddin
Externí odkaz:
http://arxiv.org/abs/1904.12876
Autor:
Wiens, Christopher D., Wenger, Trey V., Tzanavaris, Panayiotis, Johnson, Kelsey E., Gallagher, S. C., Xiao, Liting
Publikováno v:
ApJ (2019) 873 124
We use the outputs of a semi-analytical model of galaxy formation run on the Millennium Simulation to investigate the prevalence of 3D compact groups (CGs) of galaxies from $z = 11$ to 0. Our publicly available code identifies CGs using the 3D galaxy
Externí odkaz:
http://arxiv.org/abs/1901.09041