Zobrazeno 1 - 10
of 244
pro vyhledávání: '"Carlberg, Raymond"'
Autor:
Carlberg, Raymond G., Ibata, Rodrigo, Martin, Nicolas F., Starkenburg, Else, Aguado, David S., Malhan, Khyati, Venn, Kim
The C-19 star stream has the abundance characteristics of an unusually metal poor globular cluster but kinematically is uncharacteristically hot and wide for a cluster stream, having a line of sight velocity dispersion of 6 \kms\ and a 1-sigma width
Externí odkaz:
http://arxiv.org/abs/2410.22966
Autor:
Valluri, Monica, Fagrelius, Parker, Koposov, Sergey. E., Li, Ting S., Gnedin, Oleg Y., Bell, Eric F., Carlberg, Raymond G., Cooper, Andrew P., Aguilar, Jessia N., Prieto, Carlos Allende, Belokurov, Vasily, Silva, Leandro Beraldo e, Brooks, David, Byström, Amanda, Claybaugh, Todd, Dawson, Kyle, Dey, Arjun, Doel, Peter, Forero-Romero, Jaime E., Gaztañaga, Enrique, Gontcho, Satya Gontcho A, Honscheid, Klaus, Kisner, T ., Kremin, Anthony, Lambert, A., Landriau, Martin, Guillou, L. Le, Levi, Michael E., de la Macorra, Axel, Manera, Mark, Martini, Paul, Medina, Gustavo E., Meisner, Aaron, Miquel, Ramon, Moustakas, John, Myer, Adam D., Najita, Joan, Poppett, Claire, Prada, Francisco, Rezaie, Mehdi, Rossi, Graziano, Riley, Alex H., Sanchez, Eusebio, Schlegel, David, Schubnell, Michael, Sprayberry, David, Tarlé, Gregory, Thomas, Guillaume, Weaver, Benjamin A., Wechsler, Risa H., Zhou, Rongpu, Zou, Hu
We present ~ 126 new spectroscopically identified members of the GD-1 tidal stream obtained with the 5000-fiber Dark Energy Spectroscopic Instrument (DESI). We confirm the existence of a ``cocoon'' which is broad (FWHM~2.932deg~460pc) and kinematical
Externí odkaz:
http://arxiv.org/abs/2407.06336
The dark matter subhalos orbiting in a galactic halo perturb the orbits of stars in thin stellar streams. Over time the random velocities in the streams develop non-Gaussian wings. The rate of velocity increase is approximately a random walk at a rat
Externí odkaz:
http://arxiv.org/abs/2405.18522
Autor:
Sestito, Federico, Vitali, Sara, Jofre, Paula, Venn, Kim A., Aguado, David S., Aguilera-Gómez, Claudia, Ardern-Arentsen, Anke, Silva, Danielle de Brito, Carlberg, Raymond, Eldridge, Camilla J. L., Gran, Felipe, Hill, Vanessa, Jablonka, Pascale, Kordopatis, Georges, Martin, Nicolas F., Matsuno, Tadafumi, Rusterucci, Samuel, Starkenburg, Else, Viswanathan, Akshara
Publikováno v:
A&A 689, A201 (2024)
The most metal-poor stars provide valuable insights into the early chemical enrichment history of a system, carrying the chemical imprints of the first generations of supernovae. The most metal-poor region of the Sagittarius dwarf galaxy remains inad
Externí odkaz:
http://arxiv.org/abs/2405.00096
Autor:
Viswanathan, Akshara, Starkenburg, Else, Matsuno, Tadafumi, Venn, Kim A., Martin, Nicolas F., Longeard, Nicolas, Ardern-Arentsen, Anke, Carlberg, Raymond G., Fabbro, Sebastien, Kordopatis, Georges, Montelius, Martin, Sestito, Federico, Yuan, Zhen
Publikováno v:
A&A 683, L11 (2024)
Context. Gaia DR3 has offered the scientific community a remarkable dataset of approximately one million spectra acquired with the Radial Velocity Spectrometer (RVS) in the Calcium II triplet region, that is well-suited to identify very metal-poor (V
Externí odkaz:
http://arxiv.org/abs/2309.06137
Autor:
Martin, Nicolas F., Starkenburg, Else, Yuan, Zhen, Fouesneau, Morgan, Ardern-Arentsen, Anke, De Angeli, Francesca, Gran, Felipe, Montelius, Martin, Rusterucci, Samuel, Andrae, René, Bellazzini, Michele, Montegriffo, Paolo, Esselink, Anna F., Zhang, Hanyuan, Venn, Kim A., Viswanathan, Akshara, Aguado, David S., Battaglia, Giuseppina, Bayer, Manuel, Bonifacio, Piercarlo, Caffau, Elisabetta, Côté, Patrick, Carlberg, Raymond, Fabbro, Sébastien, Alvar, Emma Fernández, Hernández, Jonay I. González, de La Vernhe, Isaure González Rivera, Hill, Vanessa, Ibata, Rodrigo A., Jablonka, Pascale, Kordopatis, Georges, Lardo, Carmela, McConnachie, Alan W., Navarrete, Camila, Navarro, Julio, Recio-Blanco, Alejandra, Janssen, Rubén Sánchez, Sestito, Federico, Thomas, Guillaume F., Vitali, Sara, Youakim, Kristopher
We used the spectro-photometric information of ~219 million stars from Gaia's DR3 to calculate synthetic, narrow-band, metallicity-sensitive CaHK magnitudes that mimic the observations of the Pristine survey, a survey of photometric metallicities of
Externí odkaz:
http://arxiv.org/abs/2308.01344
Autor:
Carlberg, Raymond G., Agler, Hayley
Dark matter sub-halos that pass near or through a thin tidal star stream locally increase its velocity dispersion. Subsequent orbital evolution further increases the velocity dispersion and stream width, lowering the surface density of a stream. The
Externí odkaz:
http://arxiv.org/abs/2301.08991
Autor:
Sestito, Federico, Venn, Kim A., Arentsen, Anke, Aguado, David, Kielty, Collin L., Lardo, Carmela, Martin, Nicolas F., Navarro, Julio F., Starkenburg, Else, Waller, Fletcher, Carlberg, Raymond G., François, Patrick, Hernández, Jonay I. González, Kordopatis, Georges, Vitali, Sara, Yuan, Zhen
The investigation of the metal-poor tail in the Galactic bulge provides unique information on the early Milky Way assembly and evolution. A chemo-dynamical analysis of 17 very metal-poor stars (VMP, [Fe/H] $<-2.0$) selected from the Pristine Inner Ga
Externí odkaz:
http://arxiv.org/abs/2208.13791
Autor:
Ni, Yuan Qi, Moon, Dae-Sik, Drout, Maria R., Polin, Abigail, Sand, David J., GonzÁlez-GaitÁn, Santiago, Kim, Sang Chul, Lee, Youngdae, Park, Hong Soo, Howell, D. Andrew, Nugent, Peter E., Piro, Anthony L., Brown, Peter J., Galbany, LluÍs, Burke, Jamison, Hiramatsu, Daichi, Hosseinzadeh, Griffin, Valenti, Stefano, Afsariardchi, Niloufar, Andrews, Jennifer E., Antoniadis, John, Beaton, Rachael L., Bostroem, K. Azalee, Carlberg, Raymond G., Cenko, S. Bradley, Cha, Sang-Mok, Dong, Yize, Gal-Yam, Avishay, Haislip, Joshua, Holoien, Thomas W. -S., Johnson, Sean D., Kouprianov, Vladimir, Lee, Yongseok, Matzner, Christopher D., Morrell, Nidia, Mccully, Curtis, Pignata, Giuliano, Reichart, Daniel E., Rich, Jeffrey, Ryder, Stuart D., Smith, Nathan, Wyatt, Samuel, Yang, Sheng
SN~2018aoz is a Type Ia SN with a $B$-band plateau and excess emission in the infant-phase light curves $\lesssim$ 1 day after first light, evidencing an over-density of surface iron-peak elements as shown in our previous study. Here, we advance the
Externí odkaz:
http://arxiv.org/abs/2206.12437
Autor:
Vitali, Sara, Arentsen, Anke, Starkenburg, Else, Jofré, Paula, Martin, Nicolas F., Aguado, David S., Carlberg, Raymond, Hernández, Jonay I. González, Ibata, Rodrigo, Kordopatis, Georges, Malhan, Khyati, Ramos, Pau, Sestito, Federico, Yuan, Zhen, Buder, Sven, Lewis, Geraint F., Wan, Zhen, Zucker, Daniel B.
We present a comprehensive metallicity analysis of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) using $Pristine\,CaHK$ photometry. We base our member selection on $Gaia$ EDR3 astrometry applying a magnitude limit at $G_{0} = 17.3$, and our popu
Externí odkaz:
http://arxiv.org/abs/2204.12140