Zobrazeno 1 - 10
of 115
pro vyhledávání: '"Gallagher, Sarah C."'
Autor:
Green, Kaylie S., Gallagher, Sarah C., Leighly, Karen M., Choi, Hyunseop, Grupe, Dirk, Terndrup, Donald M., Richards, Gordon T., Komossa, S.
Publikováno v:
2023, ApJ, 953, 186
Broad Absorption Line Quasars (BALQs) are actively accreting supermassive black holes that have strong outflows characterized by broad absorption lines in their rest-UV spectra. Variability in these absorption lines occurs over months to years depend
Externí odkaz:
http://arxiv.org/abs/2405.06027
Autor:
Ahmed, Harum, Shemmer, Ohad, Matthews, Brandon, Dix, Cooper, Ha, Trung, Richards, Gordon T., Brotherton, Michael S., Myers, Adam D., Brandt, W. N., Gallagher, Sarah C., Green, Richard, Lira, Paulina, McLane, Jacob N., Plotkin, Richard M., Schneider, Donald P.
We present the rest-frame ultraviolet-optical spectral properties of 65 broad absorption line (BAL) quasars from the Gemini Near Infrared Spectrograph-Distant Quasar Survey (GNIRS-DQS). These properties are compared with those of 195 non-BAL quasars
Externí odkaz:
http://arxiv.org/abs/2404.12343
Autor:
Leighly, Karen M., Choi, Hyunseop, Eracleous, Michael, Terndrup, Donald M., Gallagher, Sarah C., Richards, Gordon T.
We present the optical-near infrared spectral energy distributions (SED) and near infrared variability properties of 30 low-redshift iron low-ionization Broad Absorption Line quasars (FeLoBALQs) and matched samples of LoBALQs and unabsorbed quasars.
Externí odkaz:
http://arxiv.org/abs/2402.07855
Autor:
Rodruck, Michael, Charlton, Jane, Borthakur, Sanchayeeta, Chitre, Aparna, Durrell, Patrick R., Elmegreen, Debra, English, Jayanne, Gallagher, Sarah C., Gronwall, Caryl, Knierman, Karen, Konstantopoulos, Iraklis, Li, Yuexing, Maji, Moupiya, Mullan, Brendan, Trancho, Gelys, Vacca, William
We present results of a Hubble Space Telescope (HST) UBVI-band study of star clusters in tidal tails, using new WFC3 and ACS imaging to complement existing WFPC2 data. We survey 12 tidal tails across seven merging systems, deriving ages and masses fo
Externí odkaz:
http://arxiv.org/abs/2309.10267
Autor:
Ha, Trung, Dix, Cooper, Matthews, Brandon M., Shemmer, Ohad, Brotherton, Michael S., Myers, Adam, Richards, Gordon T., Maithil, Jaya, Anderson, Scott F., Brandt, W. N., Diamond-Stanic, Aleksandar M., Fan, Xiaohui, Gallagher, Sarah C., Green, Richard F., Lira, Paulina, Luo, Bin, Netzer, Hagai, Plotkin, Richard, Runnoe, Jessie C., Schneider, Donald P., Strauss, Michael A., Trakhtenbrot, Benny, Wu, Jianfeng
Weak emission-line quasars (WLQs) are a subset of Type 1 quasars that exhibit extremely weak Ly$\alpha +$N V $\lambda$1240 and/or C IV $\lambda$1549 emission lines. We investigate the relationship between emission-line properties and accretion rate f
Externí odkaz:
http://arxiv.org/abs/2304.04783
Autor:
Khatu, Viraja C., Gallagher, Sarah C., Horne, Keith, Cackett, Edward M., Hu, Chen, Du, Pu, Wang, Jian-Min, Bian, Wei-Hao, Bai, Jin-Ming, Chen, Yong-Jie, Hall, Patrick, Jiang, Bo-Wei, Li, Sha-Sha, Li, Yan-Rong, Pasquini, Sofia, Songsheng, Yu-Yang, Wang, Chan, Xiao, Ming, Yu, Zhe
Measuring broad emission-line widths in active galactic nuclei (AGN) is not straightforward owing to the complex nature of flux variability in these systems. Line-width measurements become especially challenging when signal-to-noise is low, profiles
Externí odkaz:
http://arxiv.org/abs/2303.15618
Autor:
Lenkić, Laura, Tzanavaris, Panayiotis, Gallagher, Sarah C., Desjardins, Tyler D., Walker, Lisa May, Johnson, Kelsey E., Fedotov, Konstantin, Charlton, Jane, Hornschemeier, Ann E., Durrell, Pat R., Gronwall, Caryl
Compact groups of galaxies provide insight into the role of low-mass, dense environments in galaxy evolution because the low velocity dispersions and close proximity of galaxy members result in frequent interactions that take place over extended time
Externí odkaz:
http://hdl.handle.net/10150/621463
http://arizona.openrepository.com/arizona/handle/10150/621463
http://arizona.openrepository.com/arizona/handle/10150/621463
Autor:
Gallagher, Sarah C., Smeenk, Chris
Observational astronomy is plagued with selection effects that must be taken into account when interpreting data from astronomical surveys. Because of the physical limitations of observing time and instrument sensitivity, datasets are rarely complete
Externí odkaz:
http://arxiv.org/abs/2302.10774
Autor:
Dewsnap, Callum, Barmby, Pauline, Gallagher, Sarah C., Urry, C. Megan, Ghosh, Aritra, Powell, Meredith C.
The COSMOS field has been extensively observed by most major telescopes, including Chandra, HST, and Subaru. HST imaging boasts very high spatial resolution and is used extensively in morphological studies of distant galaxies. Subaru provides lower s
Externí odkaz:
http://arxiv.org/abs/2209.11325
Autor:
Choi, Hyunseop, Leighly, Karen M., Dabbieri, Collin, Terndrup, Donald M., Gallagher, Sarah C., Richards, Gordon T.
We present continued analysis of a sample of low-redshift iron low-ionization broad absorption-line quasars (FeLoBALQs). Choi et al. (2022) presented $SimBAL$ spectral analysis of BAL outflows in 50 objects. Leighly et al. (2022) analyzed optical emi
Externí odkaz:
http://arxiv.org/abs/2208.02834